Recent questions tagged LINQ

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linq - Convert list of one type to list of another type in C# 3.5

I have an object, with ID and Name properties. I have a list of the objects, but I want to ... List<string> myObjectNames = myObjectList.? See Question&Answers more detail:os...

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

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668 views

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linq - Mock IDocumentQuery with ability to use query expressions

I need to be able to mock IDocumentQuery, to be able to test piece of code, that queries ... predicate on collectionDocuments parameter? See Question&Answers more detail:os...

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

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759 views

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linq - How to construct Where Expression dynamically in Entity Framework?

I've taken a look at this answer on how to dynamically create an OrderBy expression in Entity Framework. But I' ... with ands and or operators. See Question&Answers more detail:os...

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

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linq - And difference between FirstOrDefault(func) & Where(func).FirstOrDefault()?

Is there any difference between DataFeedManager.LoadAllDataFeeds().FirstOrDefault(d => d.ItemID == itemId); and ... one over the other? See Question&Answers more detail:os...

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

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linq - C# Generic Passing different objects with same properties

I am not sure if what I am doing is possible. I have 2 methods. The body of the 2 methods are exactly ... do other stuff to it after returning See Question&Answers more detail:os...

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

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1.1k views

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linq - Pivot in c# entity framework 3.5

ISO Code description Year value CAD Canadian Dollar 2009 1.3001 CAD Canadian Dollar 2010 1.3001 CAD Canadian ... . Can someone please 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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683 views

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linq to sql - SQLMetal Multiple Foreign Keys Pointing to One Table Issue

Edit - Cleaning up question to better reflect the actual issue: I'm using SQLMetal to generate database classes ... ANYONE have a solution?? See Question&Answers more detail:os...

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

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694 views

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linq to sql - Out of memory when creating a lot of objects C#

I'm processing 1 million records in my application, which I retrieve from a MySQL database. To do so I'm ... doing wrong? 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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linq - Dividing an Expression in C# using Expression.AndAlso() causes an Exception

On my project written in C#, I've found a HUGE predicate that is used in this method of linq : public ... I reverted to the huge predicate. See Question&Answers more detail:os...

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

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linq - How to get Alternate elements using Enumerable in C#

This is a continuation of my question: How to get reverse of a series of elements using Enumarable in C#? ... elements using Enumarable in C#? See Question&Answers more detail:os...

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

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999 views

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linq - In C#, what is the best way to sort a list of objects by a string property and get correct order?

I have a list of "Issue" objects and i want to sort them by the "Priority" field. The issue is that "Priority ... " which is higher than "LOW" ? See Question&Answers more detail:os...

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

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664 views

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linq - Dynamic query with WCF RIA Services

I use Silverlight 4 with WCF RIA Services (domain services with EF4). Now I'd like to add a functionality, which ... so, how can I do that? See Question&Answers more detail:os...

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

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619 views

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linq - C# Count() Extension Method Performance

If the LINQ Count() extension method is invoked on an IEnumerable<T> that has a Count property (e.g. List< ... method can take advantage of it? 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

1 answer

linq to sql - Convert SqlCommand Output to List<MyType>?

I am using an ADO.NET SqlCommand with a single SqlDbType.Structured parameter to send a table-valued parameter to a ... bits) into List? 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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815 views

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linq - Native C# support for checking if an IEnumerable is sorted?

Is there any LINQ support for checking if an IEnumerable<T> is sorted? I have an enumerable that I want to verify is ... ; } } } return true; } See Question&Answers more detail:os...

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

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796 views

1 answer

linq - Equivalent to SQL IN clause

I've got an entity called new_trexmail with a string attribute called new_contextline. I'm trying to get a list of ... , 'hhh')? Thanks, David See Question&Answers more detail:os...

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

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640 views

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linq to sql - cannot add an entity with a key that is already in use

I have got this weird error Cannot add an entity with a key that is already in use But what is quite ... what certainly caused 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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946 views

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linq - c# sorting a List<> using Tuple?

I need to sort a List<> of MediaItem objects by publish date...the publish date is not a property of the item. ... , DateTime>(item, date)); } See Question&Answers more detail:os...

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

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837 views

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linq - What instantiate-able types implementing IQueryable<T> are available in .Net 4.0?

Within the context of C# on .Net 4.0, are there any built-in objects that implement IQueryable<T>? See Question&Answers more detail:os...

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

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749 views

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linq - Merging Dictionary containing a List in C#

This is kind-of related to this question, on how to merge two dictionaries in C#. An elegant Linq solution is ... to have an elegant solution. See Question&Answers more detail:os...

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

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625 views

1 answer

linq - Collection Exists Criteria in WCF Data Services

I'm trying to ask my OData service: "Give me all the Products that do not have a Category" with the ... don't answer with other options. See Question&Answers more detail:os...

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

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914 views

1 answer

linq to sql - Get the total number of records when doing pagination

To get a page from a database I have to execute something like this: var cs = ( from x in base. ... another query to get the count. See Question&Answers more detail:os...

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

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651 views

1 answer

linq - Most idiomatic way to write batchesOf size seq in F#

I'm trying to learn F# by rewriting some C# algorithms I have into idiomatic F#. One of the first ... without the ref mutable variable. See Question&Answers more detail:os...

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

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893 views

1 answer

linq - How do I query an integer column for "starts with" in Entity Framework?

I have a column that's defined as an integer in EF (Code First). I want to search it using "starts with ... Framework. Can anyone lend any 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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844 views

1 answer

linq to sql - LinqToSql .Contains and nvarchar vs varchar parameters -> index conversion plan

I have a just one table mapped in a datacontext. Here's the property and attribute on the column of ... without getting this index conversion? See Question&Answers more detail:os...

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

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950 views

1 answer

linq to sql - The query results cannot be enumerated more than once?

I'm using LINQ to SQL to get a search result of a FullTextSearch stored procedure in Sql server 2008. I dragged ... am I missing here, guys? 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

1 answer

linq - Exclude property from WebApi OData (EF) response in c#

I'm working with a WebApi project in C# (EF code first) and I'm using OData. I have a "User" ... available in controller to make Linq 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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680 views

1 answer

linq - remove duplicate items from list in c#

I have list of class of type public class MyClass { public SomeOtherClass classObj; public string BillId; } public ... way to achieve this? See Question&Answers more detail:os...

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

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