Recent questions tagged linq

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linq - C#: Compare contents of two IEnumerables

Is there a built in linq method thing I can use to find out if two sequences contains the same items, not ... both sequences first, wouldn't I? See Question&Answers more detail:os...

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

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linq - IEqualityComparer for anonymous type

I have this var n = ItemList.Select(s => new { s.Vchr, s.Id, s.Ctr, s.Vendor, s.Description, s.Invoice ... Obi Wan Kenobi, you're my only hope" See Question&Answers more detail:os...

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

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linq - Moqing Entity Framework 6 .Include() using DbSet<>

I'd like to give the background to this question. Skip if you like. For quite a while I've paid close attention ... 't had any luck with it. See Question&Answers more detail:os...

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

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linq - Good way to get the key of the highest value of a Dictionary in C#

I'm trying to get the key of the maximum value in the Dictionary<string, double> results. This is what I have ... was a better way to do 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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linq to entities - Entity Framework .Where nested in .Include

I'm attempting to perform a db lookup using EF5 code-first. The basic structure and table relationships are as ... and explain a little better. See Question&Answers more detail:os...

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

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linq - How to change what default(T) returns in C#?

I would like to change how default(T) behaves for certain classes. So instead of returning null for my reference ... this is at all possible? See Question&Answers more detail:os...

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

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linq to sql: join multiple columns from the same table

How do I inner join multiple columns from the same tables via Linq? For example: I already have this.. ... table2.Country equals table1.Country See Question&Answers more detail:os...

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

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linq - Point connectionstring in dbml to app.config

Can I just point the connection string in Dbml.designer.cs to the connectionstring in the app.conf? I wrote ... "Application Settings" to False See Question&Answers more detail:os...

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

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linq - How to implement Unit of Work that works with EF and NHibernate

I was working on a Unit of Work implementation that works both in Entity Framework 4.1 and NHibernate. Find ... }; return query.AsEnumerable(); See Question&Answers more detail:os...

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

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linq - OrderBy descending in Lambda expression?

I know in normal Linq grammar, orderby xxx descending is very easy, but how do I do this in Lambda expression? See Question&Answers more detail:os...

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

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linq to objects - IList<T> to IQueryable<T>

I have an List and I'd like to wrap it into an IQueryable. Is this possible? See Question&Answers more detail:os...

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

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linq - Convert DataTable to Generic List in C#

Disclaimer: I know its asked at so many places at SO. My query is a little different. Coding Language: C# 3.5 I ... = (Int64)x.ItemArray[0] }); See Question&Answers more detail:os...

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

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linq to sql - T4 template to Generate Enums

I'm looking at creating a T4 template to generate enums of my database. Essentially, I want the same feature ... be much appreciated. thanks. See Question&Answers more detail:os...

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

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linq - Expose IQueryable Over WCF Service

I've been learning about IQueryable and lazy loading/deferred execution of queries. Is it possible to expose this ... can follow? Thank you. See Question&Answers more detail:os...

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

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972 views

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linq - Sum of TimeSpans in C#

I have a collection of objects that include a TimeSpan variable: MyObject { TimeSpan TheDuration { get; set; ... suggestion on this summation? See Question&Answers more detail:os...

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

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764 views

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linq - C# Pass Lambda Expression as Method Parameter

I have a lambda expression that I'd like to be able to pass around and reuse. Here's the code: public ... someone please give me an example? See Question&Answers more detail:os...

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

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linq - Entity Framework, Code First and Full Text Search

I realize that a lot of questions have been asked relating to full text search and Entity Framework, but I ... with code first? Thanks, Eric See Question&Answers more detail:os...

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

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871 views

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linq - Sum of items in a collection

Using LINQ to SQL, I have an Order class with a collection of OrderDetails. The Order Details has a property called ... there is a better way. See Question&Answers more detail:os...

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

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534 views

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linq - Entity Framework - "Unable to create a constant value of type 'Closure type'..." error

Why do I get the error: Unable to create a constant value of type 'Closure type'. Only primitive types ( ... All method, right? Any suggestions? See Question&Answers more detail:os...

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

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539 views

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linq - C# Select elements in list as List of string

In C# i need to get all values of a particular property from an object list into list of string List<Employee> ... the result as list of string See Question&Answers more detail:os...

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

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739 views

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linq - C#: How to convert a list of objects to a list of a single property of that object?

Say I have: IList<Person> people = new List<Person>(); And the person object has properties like FirstName, ... IList<string> firstNames = ??? See Question&Answers more detail:os...

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

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522 views

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linq - Filter a list by another list C#

I have the following business objects: public class ItemCategoryBO { public string ItemCategory { get; set; } public ... back items 2 and 3) See Question&Answers more detail:os...

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

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