Linq query to list. Select call probably isn't doing what you think it's doing.

Linq query to list Select() to do is create an object of the type you desire. It ignores null values in the source sequence. Add items to list from linq var. The following example shows three query expressions. How to add a new item to a list pre-filled by linq? 2. Hi Christian , What will be the change in code if i have a List<my_Custom_Class> and List<string>. ActiveDate. We can't reuse the sample class here, because in that class list is of type List<int> and not string. Item1, f. Syntax of LINQ to Lists or Collections. Adding Items to List using Linq. Better would be to use IList or ICollection as the type for source. ToList(); Say I have a class Customer which has a property FirstName. public static IEnumerable<TSource> AreNotEqual<TSource, TKey, TTarget>(this IEnumerable<TSource> source, Func<TSource, TKey> sourceKeySelector The problem here is that when you are calling ToString the query is not executed yet, so essentially you are calling ToString on a IQueryable object, receiving the query instead of results. You just need to call ToList() at the end of the query. MaxBy(rs => rs. Now, I would like to extract all the Values for the intersecting Keys between selectedOptions and masterList. Async (part of dotnet/reactive) comes with a bunch of helpful extension methods for IAsyncEnumerable types. Contains(item. Of course, it makes more sense to do that when you've specified an orderby clause. I am not good with LINQ and i haven't tested this solution but what about this: HINT: This solution may not be good, because it has side effects (see comment on other answer) assuming you have these classes: public class Group1 { public int Id {get;set;} public string Name {get;set;} public int Sortkey {get;set;} public List<Group2> Categories {get;set;} } public class As an extension method. Also, personally I prefer the Fluent version of a linq query, easy on the eyes, Linq list of lists to single list. When checking whether a reference (or nullable value The List class's constructor can convert an IQueryable for you: public static List<TResult> ToList<TResult>(this IQueryable source) { return new List<TResult>(source); } or you can just convert it without the extension method, of course: var list = new List<T>(queryable); myList. // given: // public T MyProperty { get; } var nonNullItems = list. From this MSDN article:. ToArray(); However, if you're going to iterate over the sku's in subsequent code I recommend not using the ToArray() bit as it forces the queries execution prematurely and makes the applications performance worse. IQueryable(Of String))' cannot be converted to 'System. c# this is my collection of company list I want to assign values to Name property using LINQ listofCompany. 4. There are methods to converting it to In this blog we will see how linq query result can be converted into list and later how the list can be consumed according to the any requirement perspective. var distinct = list. list in list in a single linq query. Contains(part. Item2 }). And was able to write the following linq expression, however my results never actually As Jon Skeet and Marc Gravell already mentioned, you can simple take a contains condition. In this case, make the return type 'IEnumerable<Entitities. The following example code clears how to convert to List Object. How to store linq query results in viewmodels. TutorialsTeacher. The . Instead you can just do; And to finish, my problem : I want to apply Linq query to list to obtain filtered_list. Essentially I want a list of the unique items by type, kind of like an SQL Distinct query, how do I achieve this in LINQ? Flatten the list of list of addresses by projecting each store to its list of addresses, use SelectMany to achieve the flattening, and then take only those where the address type is physical: var addressesToModify = storeList. How to compare previous record column value with current record column value of a list using LINQ query in C#. EDIT : I saw it was impossible or almost to make it by linq in 1 step. List<string> selectedOptions; Dictionary<string,string> masterList; masterList comprises of Keys, which are the superset for the values in selectedoptions. id_num)) But obviously it's not as simple with a list of string arrays. Attribute("type") where attrib != null let type = attrib. Remember, it is a side effect and it is not the proper way to update. Id = 1); (I want to assing name property of company id 1) If I would like to retrieve a list of all the StockIDs and populate it into a IEnumerable or IList. – The best approach is to perform your linq query on the collection of key-value pairs, then use a Select projection to select either the Keys or the Values at the end of your query. ToList() does not work either: Value of type 'System. chartData. this is my collection of company list I want to assign values to Name property using LINQ listofCompany. Date)). Improve this answer. What I am trying to achieve is a linq query to get all items out of the dictionary where any values from said dictionary are in the List<string>. The object in topThree is not the results, it is the query. Also, personally I prefer the Fluent version of a linq query, easy on the eyes, I would like to query the DB and get a list of Categories(which I am doing using Linq query syntax). net; linq; Share. SelectMany(item => item). List<Stock> stockItems = new List<Stock>(); List<Guid> ids = new List<Guid>(); foreach (Stock itm in stockItems) { ids. linq previous next item? 6. Description). query = query. Select(x => x. DownTimeCodes where r. The ToList() can be replaced with an AsQueryable() or AsEnumerable() based on your need. I found this post to be helpful, LINQ querying a Dictionary against a List. Using Linq how I have to add list items. What you need the . doritos == "coolRanch")). Select call probably isn't doing what you think it's doing. Modified 13 years, 10 months ago. For example suppose List1 = List<Custom_Class> and List2 = List<String>. Where(item => validIds. Select() and Where() will return IQueryable<T>, not List<T>. ForEach(s => s. this is a int[] i have a variable called filteredTags which is also a int[]. Using Dynamic Column Names in a Linq Query. Where(x => listOfStrings. Select(x => new { x. This seems like it should be relatively easy but so far I'm just finding examples of displaying the results in the view. For example: Also, I have looked at this question here, but the author of that question seems content to do things the other way round ( query. If you are stuck with . Skip((page - 1) * pageSize). Basically, a list doesn't remember how it was created. Where(x => ingredients. ToString() on whatever you pass into it. typeID); I have a LINQ query that returns some object like this var query = from c in db. Property,c. LINQ to Lists/collection means writing the LINQ queries on list or collection. ResourceAndTools (List(of T)) without instantiating a new object and copying the properties like I'm doing. Improve I'm in the process of converting my chart application from preset data to using a database. Commented Apr 27, 2018 at 12:25. The first query expression demonstrates how to filter or LINQ ToList() Method In LINQ, the ToList operator takes the element from the given source, and it returns a new List. EndDate. To unblock I have resorted to creating 2 or 3 You need to check if it's Nothing first and use the AndAlso keyword to stop it from evaluating the latter statement. Instead you can just do; i have a list of project objects: IEnumerable<Project> projects a Project class as a property called Tags. How would the As mentionned above, ViewModelX contains a List(of T) T being ResourceAndTools. So My Linq query wants to be able to return all the Kitchen Appliances for Example. In MoreLINQ we have the DistinctBy operator which you could use:. Contains(query) select part; } At first I went with the approach to use foreach and go trough each dictionary key to compare it with the list segments to find the matches. I am using below linq query to set value of SecKey, but I still see the old value in list studentData, below id the sample I am using which is not working/not setting the value, studentData. var empQuery = Linq tolist method with example. When checking whether a reference (or nullable value For whatever reason, when creating a list with the LINQ query the items would not work with matching using an conditional, fullList had to be created using a query and then access individually using the dbcontext. So, in this case, input would be converted to type List. Then iterate through that list of Categories for use in my C# code. Dim values As List(Of String) = query. asked Sep 2, 2011 at 15:57. Since there is no meaningful string representation for IEnumerable<T>, the default in . How do you query a List<string[]> to get the index of the arrays having matches on their sub-arrays and get a return of type System. Just use the same type as MyProperty and it won't filter out anything else. attempting to return a multiple group by object. I know that I can easily just iterate through the list of string arrays and create a simple list of strings with the 0th value, like this: In version 3, select x is returning a sequence of strings that match your critera; it just happens to be a sequence with one item in it. Linq query convert to List<string> Ask Question Asked 13 years, 10 months ago. Follow Select() and Where() will return IQueryable<T>, not List<T>. JDavila JDavila. Based on your wording, I think part I am trying to get the sum of the value from list of list using linq ?my data is as below code List<List<string>> allData = new List<List<string>>(); using The biggest issue you were having was that you didn't grab the . Filter list with Linq. And I tried Any, Where. public IQueryable<Part> SearchForParts(string[] query) { return from part in db. toArray(); Also, I have looked at this question here, but the author of that question seems content to do things the other way round ( query. This list returned must also be of type: List<Stock>. ID == id) . ToString will try to convert the object into a string, which by default will return the type name. EventName. Linq, combining multiple records into comma separated string, grouped by distinct value. Linq query to get list inside list. It does not modify the query. t_Person. Select(t => t. NET is to print the string name of the type. But in case of your like query, it's very dangerous to take a Single() statement, because that implies that you only find 1 result. Contains(w)). SelectMany() but always end up with creating an exception. In this blog we will see how linq query result can be converted into list and later how the list can be consumed according to the any requirement perspective. name, list = String. result is a list of anonymous types, each with a member (children) that is an enumerable set of Child records. Linq Group By through C#. Distinct(); I think this solves your problem The differences in the native query languages of the data sources (into which LINQ queries are translated by the provider) sometimes force different limitations on query possibilities. Property2)); } Is there a way to combine into something list this? I'm constructing a linq query that will check is a string in the DB contains any of the strings in a list of strings. Contains(x. Add(i)); will lead to a list that includes all occurrences of duplicates. 8. That avoids the problem altogether. i have a list of project objects: IEnumerable<Project> projects a Project class as a property called Tags. Exp. Parts where part. Select(w => w. Collections. var items = listObject. Add the package to your project: dotnet add package System. for creation List is better with memory but worse with cpu since list is a generic solution every action requires range checks additional to the . I have a Linq query that returns a list and the result looks like this: protected void Page_Load(object sender, EventArgs e) { var MyList = GetPatientsFromDB(TheUserID); } This list is of type MyModel like this: MyModel { public int PatientID {get;set;} } I'm in the process of converting my chart application from preset data to using a database. DistinctBy(x => x. 1. children). IngredientList)) In addition to being an O(n+m) operation, this has the added benefit of being code that tells you what it's doing when How to use LINQ to query from a list of objects into an existing object? 25. select("$. var events = DBContext. LinQ select an object with a list as parameter. And query is executed on DB server. You can call ToList() still: . For example, if source is the result of a LINQ query the Skip/Take would trigger nbChunk enumerations of the query. typeID); The code continues on with a few more queries, but the gist is I have to create a List out of each query in order for the compiler to know that all of the objects in content. Where(i => !hash. LINQ Next Item in List. Conceptualizing an advanced linq query using multifield filtering. You need something like: socios = socios. Share. com is your authoritative source for comprehensive technologies tutorials, tailored to guide you through mastering various web and other technologies through a step-by-step approach. Value from the returned element set. Base>` and remove the call to ToList(). What EF can do, is translate a list of simple values into SQL when you use it with the . Sounds like you want something like: var query = items. ToList(); Without assigning the result back to myList the above query will modify the value in the original list. Async Then use You can select multiple fields using linq Select as shown above in various examples this will return as an Anonymous Type. Get values from a nested list with a LINQ expression. Join(plans, wo => wo. List(Of String)'. ToList(); LINQ query to group results into an array. Where(rs => rs. Follow edited Sep 2, 2011 at 16:48. Linq Get a list of items from a list of items. Where(d => d. Related. js which offers a nice interface to many of the LINQ methods. ToList(). public struct PersonItems { public PersonItems(List<PersonItem> items) { Items = items; } public List<PersonItem> Items { get; set; } } And then method GetPersons(): public PersonItems GetPersons() { return new PersonItems(_DbEntities. I have this code How can I make a Linq query to grab ALL Productpricediscounts from a category? public class ProductCategory { public List<Product> categoryProducts; } public class Product { public List<Productprice> productPrices; } public class Productprice { public List<Productpricediscount> priceDiscounts; } My query has to look something like: But it's not a good idea always: You need another collection, so more memory, if you pass in already an array or list. AndAlso is short-circuiting. AddressType. Id)); Note that if this is all local (i. using (var db = new MyContext()) { // this is important since Market. You might not be able to use thousands of items anyway if this is not Linq-To-Objects but Linq-To-Entities(the Contains is translated to an sql-IN clause which has limitations). So the output will be a list of user lists that contains user (if that makes sense?). Then I've learned that LINQ can use SQL's inner joints to do the same thing. in author's article it modifies SQL query passed to server and injects VALUES construction with data from your local list. 23. Shapes. The way to do this using the Extention Methods, instead of the linq query syntax would be like this: var results = workOrders. – Say that I have LINQ query such as: var authors = from x in authorsList where x. SelectMany(store => store. , List<int>) by using the LINQ ToList Method in C#. Events. You are ignoring the returned value. like this:. Select() and . So if this is a LINQ to SQL (or whatever) query, you'll need a different approach. SecKey = secKey); When I use linq some how my GroupBy is throwing an exception 'System. Also, when checking if an object is null, you should use the Is or IsNot operator rather than =. Viewed 25k times 5 . Where(f => f. So I wouldn't argue that semantics is the thing preventing this function. Ask Question Asked 15 years, 6 months ago. For example: // There's no need to declare the variable separately List<AgentProductTraining> productTraining = (from records in Solution with . List(Of System. how to add more than one result to the list using a linq query. Don't use a List<Ingredient> for the ingredients that you want to find; use a HashSet<Ingredient> and the IsProperSubsetOf method, which accepts a collection as its argument:. var mapped = Enumerable. Then I have a List&lt;Customer&gt;. Could get expensive. On the other hand, you may prefer that your GetBasesForFieldOfficeCD method return a deferred-executing query instead. Contains has complexity of O(N square). 2,031 1 1 gold badge 23 23 silver badges 40 40 For a LINQ provider like LINQ-to-Entities, projecting to a new instance of an anonymous class means that it can issue an SQL query which only fetches columns which are used inside the select statement, instead of fetching all columns. Code == x select r. partName. Equals(vioID)) select new { EtchVectors = vio. Async Package (2019+) The package System. But here's another way to do it. AsQueryable(). EventID). Something like. When the query actually runs, LINQ should be able to create a temp table or table variable with the data from the local list and then join on that. tbCourses select new course(c)). c# Linq List add entry. LINQ Dynamically Select Column From The last two lines of this code do not work correctly -- the results are coming back from the LINQ query. First()); Edit: as getting this IEnumerable<> into a List<> seems to be a mystery to many people, you can simply First of all I get that List of values. Formatted. The Take(100) will end up being part of the SQL sent up - quite possibly using TOP. I'm just not sure how to successfully bind the indicated columns in the results to the textfield and valuefield of the dropdownlist: protected void BindMarketCodes() { List<lkpMarketCode> mcodesList = new List<lkpMarketCode How I would do this, would be by creating a class object that will have all of the properties that you want from the returned linq query. That means that all you're getting out of it would be something along the lines of "System. Follow answered Jan 29, 2016 at 15:47. Simple . from(selectedFruits) . Follow answered Jan 4, 2017 at 17:35. TestId }; The question is, how can I get the "Subtests" as part of the query and as a list property in my main OTest object without the LINQ running 100's of sub queries off the main query for the data. 3. tags . Value where !string. my sql table contains some employees details . IsNullOrEmpty(type) && type == "Karate" from id in As Jon Skeet and Marc Gravell already mentioned, you can simple take a contains condition. This is modification can be explained by reference parameter I would prefer not to loop through each list but instead use a Linq query to retrieve the data. So you are able to compose and execute this query the same as a more typical query. If it's already LINQ to Objects, however: return db. So I need to check the List<Custom_Class> contains any dcn from List<string>. Also, since your crepes is a List, put additional layer of LINQ (as also suggested by others) to completely fix it, something like this var item = crepes. LINQ adding to list object in loop. This way there is no need to perform a look-up at the end of your query. Where(s => filter. You need to fill that HashSet<T>, so more cpu cycles. Get previous value in linq loop? 0. Equals(otherObject. The final result: a 'normal' data-structure, not a query. MyProperty). I have two lists List<WorkOrder> and List<PlannedWork> I would like join the two lists on the workorder number as detailed below. How to add object to list item in c#. Add("Bob"); and I have another list var fullNameList = new List<string>(); but wanted to see if there anyway to do a Startswith on a list as opposed to a single string in a single line of linq code? c#; linq; collections; Share. g List<int> to int[] OR List<CustomObj> to CustomObj[] directly without using loops preferably by using Linq? In addition, I have a GenericCollection<T>, how can i convert the Linq query to GenericCollection<T> directly without looping e. Add(itm. It is not meant as a tool to re-order existing collections inline. AssetAddresses) . Can LINQ be used to find if the list has a customer with Firstname = 'John' in a single statement. Where(o => o. 439 Is there a way to just initialize the list with a simple LINQ query? Since a List<T> can be constructed with an IEnumerable<T>, does a query of the following form exist? private List<int> integerList = new List<int>(<insert query here>); Is this I have query that receives a list of items that all contain a different ID that I need to search for in a different table. Here is my sql query as follow . Linq. MoreLINQ does with its MaxBy operator, but that can't be translated into SQL of course. AsQueryable(); var values = events. 0. ToList(); I only know how to put query results to list in foreach cycle. Using linq, how can I retrieve a list of items where its list of attributes match another list? Take this simple example and pseudo code: List&lt;Genres&gt; listofGenres = new List&lt;Genre&gt; As mentionned above, ViewModelX contains a List(of T) T being ResourceAndTools. Name == "Tom"). Improve Hi Christian , What will be the change in code if i have a List<my_Custom_Class> and List<string>. So I would pass this as a "type" into the query and it would return the items 1, 3 and 4 from this example list. ScID)); but depending on the type of socios the exact syntax may be different. I have attempted a number of different approaches of . 5 or less, use this code instead: I actually needed a LINQ query that would return the full count if no item was found, so this is perfect! – Paul Chernoch. My custom class has various items in which one is DCN number and list<string> has only DCN number. Console. Solution with . LINQ doesn't execute the query when it reaches the end of your query expression. Hot Network Questions Remove a loop, adding a new dependency or having two loops What to do about potential employers requesting academic documents that would reveal my age? @PersyJack LINQ to SQL generates the T-SQL query, which then runs on the SQL Server using the database settings for case-sensitivity. WorkOrderNumber, (order,plan) => new LINQ is strong in querying collections, creating projections over existing queries or generating new queries based on existing collections. Descendants("SportPage") let attrib = sportPage. Add(GetUL(c. Contains(--any of the items in my list of strings--)); I'd also like to know how many of Deferred execution is preserved. Key. RizJa RizJa. Is there a was to copy (clone, load, not sure of the term) the content of fetchedResourceAndToolsQuery (Result of the Linq Query) to model. So I think about, with I am using LINQ Self Join Query to display data on the view . IEnumerable+WhereSelectEnumerableIterator`1". So if you extract a list of PolicyId's and a list of GroupId's from the policyKeysToDelete, and use it to select as much as you can with EF, then you can do the full check in the resultset which is then in No, that doesn't return all the values before filtering. children select child). Customers where select c; Then I do this. Any(vioID => vio. It does NOT mean "8, 6, 5". Using linq to filter sharepoint-lists with sublists. IEnumerable<string[]> ? EDIT: I I have been attempting to create a LINQ query in C# which will allow me to create a List<> from different properties in the JSON string, which are of interest to me. Where(x => x. You can convert the entity object to list Object by looping the LINQ Query results and adding the object to the list. List<dupeCheckee>' could be found (are you missing a using Lets say I have a list of strings: var searchList = new List<string>(); searchList. For example: I would like to query the DB and get a list of Categories(which I am doing using Linq query syntax). GroupBy(test => test. item. Lets say I have a list of strings: var searchList = new List<string>(); searchList. List does not care if it is created from a linq query or created manually. Example. I think you're looking for; string[] skus = myLines. 2. ToList(); or (identical): var list = result. Deferred execution is preserved. Improve this question. Date. Nested LINQ query to select 'previous' value in a list. var results = (from r in db. Follow Assuming you want the full object, but only want to deal with distinctness by typeID, there's nothing built into LINQ to make this easy. However, Entity Framework won't like that because it will try and convert that to SQL which it can't. So if you have four occurrences of 2 in your list, then your duplicate list will contain three occurrences of 2, since only one of the 2's can be added to the HashSet. Contains method. List<String> list = new List<String>(); foreach (ProgramLanguage c in query) { //GetUL returns a String list. Select() creates an object of an anonymous type, so the list will necessarily be the same anonymous type. Thanks for help me and tell how I can use Linq to filter my List and sublists. Add("Joe"): searchList. Add list to a list. Use ToList to create a generic List from a sequence. That's all it means. Id = 1); (I want to assing name property of company id 1) Use the Select method to project your result into a different format: var myList = myTable. ToList(); The query above works on an exact match but not partial matches. Or you could do a This section contains sample LINQ queries. ChildControls are of type TabSection and all of the objects in t. Dealers property is just a navigation, you need to load dealers separately. This is not the same type as you are returning. ID). for example here's my first table class: public class Presave { Filter linq query results using values from a list. FirstOrDefault(); //f is of foo type, b is of bar type ToList() will do the enumeration for you. . Join(",", x. 5 or less, use this code instead: please I need your help with a Linq expression: I have nested objects with lists, this is how the main object hierarchy looks like (each dash is an atribute of the sub-class): Folder -name -List< How to query object with nested lists using linq? 0. Sku). ToList(); That should do it, note you can also use the more SQL-like syntax: When the query actually runs, LINQ should be able to create a temp table or table variable with the data from the local list and then join on that. Join should have a lot better performance (close to O(N) due to hashing). id` . Name == "PHYSICAL"); I want to be able to run a Linq query on the above list that groups all the users by GroupID. Select(f => new List<int>() { f. ). Add(new object[]{ }); ShipCity You write most queries with query syntax to create query expressions. net. id COL1 COL2 ===== 221 2 14 221 4 56 221 24 16 221 1 34 222 20 14 222 1 12 222 5 34 var query = /* LINQ Expression */ var res = new ArrayList(); foreach (var item in query) { res. By using LINQ queries on the collection or list, we can filter or sort or remove the duplicates elements with minimal coding. Contains(s. Obviously I can do this. Modified 4 years, how can I do this in one statement so that instead of having to new the empty list and then aggregate in the next line, that I can have a single linq statement that outputs my final list. StockID); } But is there some way I could use Linq to achieve the same result? Okay, basically you can not cast an Anonymous type to a known type like TBLPROMOTION. Date) && w. But in this case, every Dealer also has Market as a navigation property, you can query to Dealer including Market first and then grouping by Market after. It means the query, not the results. I always use the following code: public static class PagingExtensions { //used by LINQ to SQL public static IQueryable<TSource> Page<TSource>(this IQueryable<TSource> source, int page, int pageSize) { return source. Hot Network Questions How we know that Newton and Leibniz discovered calculus independently? The code continues on with a few more queries, but the gist is I have to create a List out of each query in order for the compiler to know that all of the objects in content. Linq to Nested Lists. See this link for more information on what that means. Sc. Previously I was using this: var data = new Dictionary&lt;string, double&gt;(); switch ( List<String> listOfStrings = something; I would just do: var query = someCollection. Previously I was using this: var data = new Dictionary&lt;string, double&gt;(); switch ( Assuming you want the full object, but only want to deal with distinctness by typeID, there's nothing built into LINQ to make this easy. Any(b => b. serhio but here is an interesting thing: If you have a statement like: myList. Where(address => address. topThree is an object which means "sort the sequence of items in array from highest to lowest and take the first three". LINQ: Add to list for each item. ToList()); } List<course> = (from c in obj. For example: // There's no need to declare the variable separately List<AgentProductTraining> productTraining = (from records in The best approach is to perform your linq query on the collection of key-value pairs, then use a Select projection to select either the Keys or the Values at the end of your query. In linq tolist method is used to convert elements from given collection to new list. I need to show employee details with their Manager Name as it is ManagerID in the table as LINQ to Lists/Collection. Contains(searchParam)). Marks = 35). WriteLine internally calls . id) . (If you just want the typeID values, it's easy - project to that with Select and then use the normal Distinct call. in-process, LINQ to Objects) and you may have a lot of valid IDs, you probably want to construct a HashSet<T>. g. Select<T, TResult>() will return IEnumerable<TResult>, some set of new objects selected, based on the old set of objects and the function provided (which accepts an item of type T). As a secondary point, the ToString() part of your second . I created now List and put there all values where events in list of values I need @PersyJack LINQ to SQL generates the T-SQL query, which then runs on the SQL Server using the database settings for case-sensitivity. serhio. net's internal range checks for arrays. How i can split comma separated string in a group using LINQ. Something like: So the output will be a list of user lists that contains user (if that makes sense?). Linq: Get Item which is in a list which also is in a list. id") // shorthand for `x => x. Suppose I want list of Names then Column Name is "Name" and result will be list of names If column name is Description, I need list of descriptions. Where and . FistOrDefault() }) Update with System. – RB Davidson. You've got to convert it to a List<T> - which actually executes the query (instead of just preparing it). Contains(query) select part; } Sure: sam. IsProperSubsetOf(x. Whatever the return type of the Func passed to Select() will determine what type of object I have a Dictionary<string, string> and another List<string>. var ids = from sportPage in xDoc. Dynamically Set Column Name In LINQ Query. I didn't manage to obtain a list with filtered sublists. Although, if one is not careful, and materializes the query results, before applying LINQ to in-memory objects, they may suffer the consequences of mismatched case-sensitivity. WorkOrderNumber, p => p. The following sample uses ToList to immediately evaluate a query into a generic List<T>. You should be able to use SelectMany here: var list = (from item in result from child in item. You need to call something to execute the query. You can demonstrate this by executing the query, then changing the array, and then executing the I want to filter list of items based on dynamic column name. Add(item); } The former method is simple to do but does mean creating the intermediate data structure (which of the two options has a higher overhead is an interesting question and partly depends on the query so there is no general answer). NET 3. var hash = new HashSet<int>(); var duplicates = list. Where(w => w. Commented Jun 2, 2015 at 16:38. Where(w => !test2. In the following example, we first create an integer array and then convert that integer array into a list (i. If you want to avoid this anonymous type here is the simple trick. Unfortunately LINQ doesn't provide a "max by an attribute" method. - So the process is, we do the linq query and get resultsObj We then will have a new class call ViewModelOfPage (what we will be returning to the page) which will have all the properties that we want to return. Okay, basically you can not cast an Anonymous type to a known type like TBLPROMOTION. select enq_Id,enq_FromName, enq_EmailId, enq_Phone, enq_Subject, enq_Message, enq_EnquiryBy, enq_Mode, enq_Date, ProductId, (select top 1 image_name from I have a list that has values as displayed below Using Linq how can i get the minimum from COL1 and maximum from COL2 for the selected id. I actually needed a LINQ query that would return the full count if no item was found, so this is perfect! – Paul Chernoch. 439 Is there a way to just initialize the list with a simple LINQ query? Since a List<T> can be constructed with an IEnumerable<T>, does a query of the following form exist? private List<int> integerList = new List<int>(<insert query here>); Is this For whatever reason, when creating a list with the LINQ query the items would not work with matching using an conditional, fullList had to be created using a query and then access individually using the dbcontext. Amt Is there any way to efficiently convert list of values to array e. Dealers is a navigation property, // without this Sure: sam. linq query to group the items-1. Or, put another way, how can I delete all of the firstname's equalling Bob from authorsList? Now, I will run a LINQ to SQL query which will look like this: var query = from t in Tests select new OTest { TestId = t. toList(); You can convert the entity object to a list directly on the call. firstname == "Bob" select x; Given that authorsList is of type List<Author>, how can I delete the Author elements from authorsList that are returned by the query into authors?. LINQ to Entities providers are able to parse the methods of SqlFunctions into their equivalent SQL. Take(pageSize); } //used by LINQ public static IEnumerable<TSource> Page<TSource>(this Where<T>() will return IEnumerable<T>, which will be some subset of the original set. partName)), which doesn't work for me. OfType<T>(); If you want a LINQ like interface in javascript, you could use a library such as linq. list) }); Note: The result will be an anonymous type. id, x. ToList(); Convert the result of LINQ query to list of Custom Model. return index instead of break inside loop would retain functionality and readability and make easy to convert last return to return -1 if no element is found. ChildControls are of type Paragraphand so on and and so forth. net; vb. returns a filtered query. Generic. In particular, there is a limit on list joins, whether implicit or explicit, in queries that use the LINQ to SharePoint provider. How would the The List class's constructor can convert an IQueryable for you: public static List<TResult> ToList<TResult>(this IQueryable source) { return new List<TResult>(source); } or you can just convert it without the extension method, of course: var list = new List<T>(queryable); You need to check if it's Nothing first and use the AndAlso keyword to stop it from evaluating the latter statement. details is a list of items that each contain a list of You can use the OfType operator. SelectMany(item => item. e. Well LINQ replaces SQL which stands for Structured Query Language, but it still exposes the ability ability to UPDATE, DELETE, and INSERT. Here is the syntax of writing the LINQ queries on the list or collection to Use the FistOrDefault method to safely return the first item from your query, or null if the query returned no results: var result = (from vio in AddPlas where etchList. List<dupeCheckee>' does not contain a definition for 'GroupBy' and no extension method 'GroupBy' accepting a first argument of type 'System. It's a lamda expression that should do the same thing as your LINQ query but will select your Beneficiary model object and map it. ofcourse, you can say var promotionInfo = and then get an IEnumerable<{Anonymoustype}> and use that to do, what you were wanting to do with promotionInfo. Questions: What is the best way to find the matches between Dictionary Keys and certain list item? Since Market. bContained1 is the same condition for the Linq query that I have created below: List<string> test3 = test1. SecKey = secKey); EF cannot translate a list of complex objects into the SQL query. Select(grp => grp. tamncs ezqn ymbnzly odhdb qbjs azelon zde mtbuib ziqn yqzh