Recent questions tagged LINQ

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linq to sql - Entity framework result discrepancy for a database views

I have one specific view created in my DB(joins about 5-6 tables with a left join).This view is ... encountered a similar problem before ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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602 views

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linq - Convert List<List<T>> into List<T> in C#

I have a List<List<int>>. I would like to convert it into a List<int> where each int is unique. I ... .Union(list)); Any suggestions? Thanks! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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369 views

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linq - Translating expression tree from a type to another type with complex mappings

inspired by this answer I'm trying to map a property on a model class to an expression based on the actual entity. ... ); } Thanks for you help. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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426 views

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linq - Some suggestions on which .NET ORM to look at learning

I am a little ashamed to say that I have never used an ORM; as you may recall most of my career experience is ... to be done with ASP.NET MVC. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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596 views

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linq - How do i get the difference in two lists in C#?

Ok so I have two lists in C# List<Attribute> attributes = new List<Attribute>(); List<string> songs = ... difference = songs - attributes.names See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.3k views

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linq - how do I sort a collection with child property?

I should sort parent based on a field of child. sample code; IQueryable<Parent> data = context.Parents. ... sort Parent by Children Names. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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745 views

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linq to sql - The return types for the following stored procedures could not be detected

While drag-drop a stored procedure in dbml file I get this error: Unknown Return Type The return types for the ... can I resolve this error? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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429 views

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linq - Checking for duplicates in a List of Objects C#

I am looking for a really fast way to check for duplicates in a list of objects. I was thinking of simply looping ... , checkThat = "test1"} }; See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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909 views

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linq - C#: Remove duplicate values from dictionary?

How can I create a dictionary with no duplicate values from a dictionary that may have duplicate values? ... using Distinct() operation? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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795 views

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linq - How to Left Outer Join two DataTables in c#?

How can I Left Outer Join two data tables with the following tables and conditions while keeping all columns ... to reflect more situations. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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799 views

1 answer

linq - Filtering Null values in Select

I have IQueryable list of objects of type T which I want to transform into objects of type K List<K> ... when calling Select in LINQ ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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467 views

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linq - C# Difference between First() and Find()

So I know that Find() is only a List<T> method, whereas First() is an extension for any IEnumerable<T>. ... () and AsQueryable() for now. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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675 views

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linq - is it possible to Query an Odata service and expand Child of Child entities?

This sounds rather simple (and maybe I'm missing the obvious here) but I can't find a solution. I know ... split this in two separate queries? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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518 views

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linq - C# List<> GroupBy 2 Values

I'm using C# on Framework 3.5. I'm looking to quickly group a Generic List<> by two properties. For ... and ProductId using a lambda expression? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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623 views

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linq to sql - ASP.NET MVC: Best Way To Call Stored Procedure

I'm trying to decide which is the best way to call a stored procedure. I'm new to ASP.NET MVC and ... recognize what my issues are here? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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574 views

1 answer

linq - MVC3 Razor @Html.DropDownListFor

I could use some help implementing @Html.DropDownListFor. My objective is to filter the list of Products by Category. This ... { get; set; } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.0k views

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linq - How to "let" in lambda expression?

How can I rewrite this linq query to Entity on with lambda expression? I want to use let keyword or an ... to calculate average many times. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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793 views

1 answer

linq to xml - C# Distinct on IEnumerable<T> with custom IEqualityComparer

Here's what I'm trying to do. I'm querying an XML file using LINQ to XML, which gives me an IEnumerable<T ... be wrong here! Thanks in advance! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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545 views

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linq - Date comparision

In LINQ, I write a query for data, which is between two dates. In this case I am not getting data. When user enters same ... ***************** See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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569 views

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linq - Difference of two DataTables in c#

I have two data tables as follows dtOne ------------------------- ID | Name ------------------------ ... -------------- How can i achieve this . See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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645 views

1 answer

linq - Simplest Way To Do Dynamic View Models in ASP.NET MVC 3

Caveat: This might be an inappropriate use of C#'s dynamic keyword and I probably should be using a ... convert anonymous type to dynamic. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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724 views

1 answer

linq - Comparing two Lists and returning the distinct values and the differences

I have two lists: List A {A, B, C, D} List B {A, E, F, G} I need to produce three lists: One with ... the way I am using VS2012 with .NET 4.5 See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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639 views

1 answer

linq - Removing duplicate objects in a list (C#)

So I understand how to remove duplicates in a list when it comes to strings and int, etc by using ... MetricText, it must be unduplicated. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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751 views

1 answer

linq - Parse string to C# lambda Func

Is there a way to convert string representation of lambda to a lambda Func? Func<Product, bool> func = Parse< ... DLINQ at the time of asking. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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712 views

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linq - Jaxb equivalent in C#

Using JAXB in Java it is easy to generate from a xml schema file a set of Java classes that xml conforming ... then use this classes with linq? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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624 views

1 answer

linq - C# Ranking of objects, multiple criteria

I am building a plugin for a LAN party website that I wrote that would allow the use of a Round Robin ... , scoreDescription); } yield break; See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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619 views

1 answer

linq - F# List SelectMany

This is quite simple question but I didn't find an answer: Is there any Seq/List operation in F# to match the LINQ ... -> 'a list -> 'c list See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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736 views

1 answer

linq to sql - Working around LinqToSQls "queries with local collections are not supported" exception

So, I'm trying to return a collection of People whose ID is contained within a locally created collection of ... Is it possible using LinqToSql? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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