Recent questions tagged LINQ

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linq - Filtering the object of a type with OfType in C#

I have a base class Base, and class A/B that inherits from it. public class Base { int x; } public class ... ? What's wrong with the code? See Question&Answers more detail:os...

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

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573 views

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linq to sql - Can you implement an interface on a Linq2Sql class?

I have an interface called IAddress, and a class called Address that handles street, city, state/province, postal code and ... = value; } } } See Question&Answers more detail:os...

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

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503 views

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linq - How to dynamically order by certain entity properties in Entity Framework 7 (Core)

I have a project where the front-end JavaScript specifies a list of columns to order by. Then in the back-end ... and the core .net framework? See Question&Answers more detail:os...

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

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650 views

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linq - Type inference failed in the call to 'SelectMany'

I have this LINQ query: var businessAffiliates = from b in context.Businesses from ba in b.BusinessOfficers from p ... the call to 'SelectMany'. See Question&Answers more detail:os...

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

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802 views

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linq - Type inference failed in the call to 'SelectMany'

I have this LINQ query: var businessAffiliates = from b in context.Businesses from ba in b.BusinessOfficers from p ... the call to 'SelectMany'. See Question&Answers more detail:os...

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

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729 views

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linq - How to merge result IQueryable<T> together?

If I get two result IQueryable from different linq Query and I want to merge them together and return one as result ... <Person>)q1.Union(q2); See Question&Answers more detail:os...

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

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580 views

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linq - Logic Evaluator in c# (Evaluate Logical (&& ,|| ) expressions)

In my project there is a Logic evaluation section, it take input as a string which contains logical expressions (true ... LINQ / Dynamic 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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767 views

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linq - factorial of n numbers using c# lambda..?

I just started playing with lambdas and Linq expression for self learning. I took the simple factorial problem ... of approaching this problem. 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 - How can i get primary key value when i insert a new record?

I am using LINQ-to-SQL class. It has a method object.InsertOnSubmit() .But it returns void so can i ... key value of recently inserted record. See Question&Answers more detail:os...

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

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580 views

1 answer

linq - Group items in pairs

I have list of items, for example: { i1, i2, i3, i4, i5, i6, i7 }. I want to get a list, where every ... i8. Is it possible to do with 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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688 views

1 answer

linq - What is the best way to check two List<T> lists for equality in C#

There are many ways to do this but I feel like I've missed a function or something. Obviously List == List ... every element, in an exact order. See Question&Answers more detail:os...

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

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522 views

1 answer

linq - List vs IEnumerable vs IQueryable when defining Navigation property

I want to create a new model object named Movie_Type in my ASP.NET MVC web application. What will be the ... what might be the reason? BR See Question&Answers more detail:os...

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

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579 views

1 answer

linq - Entity Framework - "All" method

The All method is supposed to evaluate the argument against all elements in the list. It works OK in regular ... ().Contains) select person; See Question&Answers more detail:os...

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

0 votes

536 views

1 answer

linq - How to use SqlAzureExecutionStrategy and "Nolock"

To deal with SQL timeouts I'm trying to use SqlAzureExecutionStrategy (https://msdn.microsoft.com/en- ... "NoLock" and SqlAzureExecutionStrategy See Question&Answers more detail:os...

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

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514 views

1 answer

linq to nhibernate - Difference between deferred execution and Lazy evaluation in C#

Could you please let me know what is the exact deference between deferred execution and Lazy evaluation in C#? ... difference with an example?? See Question&Answers more detail:os...

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

0 votes

671 views

1 answer

linq to nhibernate - Difference between deferred execution and Lazy evaluation in C#

Could you please let me know what is the exact deference between deferred execution and Lazy evaluation in C#? ... difference with an example?? See Question&Answers more detail:os...

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

0 votes

746 views

1 answer

linq to nhibernate - Difference between deferred execution and Lazy evaluation in C#

Could you please let me know what is the exact deference between deferred execution and Lazy evaluation in C#? ... difference with an example?? See Question&Answers more detail:os...

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

0 votes

539 views

1 answer

linq to nhibernate - Difference between deferred execution and Lazy evaluation in C#

Could you please let me know what is the exact deference between deferred execution and Lazy evaluation in C#? ... difference with an example?? See Question&Answers more detail:os...

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

0 votes

494 views

1 answer

linq - How to use SqlAzureExecutionStrategy and "Nolock"

To deal with SQL timeouts I'm trying to use SqlAzureExecutionStrategy (https://msdn.microsoft.com/en- ... "NoLock" and SqlAzureExecutionStrategy See Question&Answers more detail:os...

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

0 votes

473 views

1 answer

linq to nhibernate - Difference between deferred execution and Lazy evaluation in C#

Could you please let me know what is the exact deference between deferred execution and Lazy evaluation in C#? ... difference with an example?? See Question&Answers more detail:os...

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

0 votes

530 views

1 answer

linq - How to use SqlAzureExecutionStrategy and "Nolock"

To deal with SQL timeouts I'm trying to use SqlAzureExecutionStrategy (https://msdn.microsoft.com/en- ... "NoLock" and SqlAzureExecutionStrategy See Question&Answers more detail:os...

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

0 votes

661 views

1 answer

linq to nhibernate - Difference between deferred execution and Lazy evaluation in C#

Could you please let me know what is the exact deference between deferred execution and Lazy evaluation in C#? ... difference with an example?? See Question&Answers more detail:os...

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

0 votes

525 views

1 answer

linq - Entity Framework - "All" method

The All method is supposed to evaluate the argument against all elements in the list. It works OK in regular ... ().Contains) select person; See Question&Answers more detail:os...

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

0 votes

522 views

1 answer

linq - How to use SqlAzureExecutionStrategy and "Nolock"

To deal with SQL timeouts I'm trying to use SqlAzureExecutionStrategy (https://msdn.microsoft.com/en- ... "NoLock" and SqlAzureExecutionStrategy See Question&Answers more detail:os...

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

0 votes

516 views

1 answer

linq to nhibernate - Difference between deferred execution and Lazy evaluation in C#

Could you please let me know what is the exact deference between deferred execution and Lazy evaluation in C#? ... difference with an example?? See Question&Answers more detail:os...

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

0 votes

551 views

1 answer

linq to sql - maintain history in a database

I am designing this database that must maintain a history of employee salary and the movements within the organization ... , suggestion or idea. See Question&Answers more detail:os...

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

0 votes

766 views

1 answer

linq to sql - C# How to convert an Expression<Func<SomeType>> to an Expression<Func<OtherType>>

I have used C# expressions before based on lamdas, but I have no experience composing them by hand. Given an ... the LINQ to SQL entities. See Question&Answers more detail:os...

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

0 votes

635 views

1 answer

linq - Is there a LINQPad equivalent to a DataContext class?

I've just begun using LINQPad and so far I like it but most tutorials I have come across for LINQ TO SQL make ... (); ... db.SubmitChanges(); See Question&Answers more detail:os...

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

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