Recent questions tagged C#

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676 views

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c# - High-Performance Timer vs StopWatch

Does anyone know if the HiPerfTimer or the StopWatch class is better for benchmarking, and why? See Question&Answers more detail:os...

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

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239 views

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c# - Is it possible to handle exceptions within LINQ queries?

Example: myEnumerable.Select(a => ThisMethodMayThrowExceptions(a)); How to make it work even if it throws ... exceptions is thrown... See Question&Answers more detail:os...

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

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581 views

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c# - Entity Framework: A referential integrity constraint violation on many to many relationship

Hey I have an application with a bunch of inproc caching and entity framework. When I want to write an update ... off the model for simplicity) See Question&Answers more detail:os...

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

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417 views

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c# - How to create 1024x1024 RGB bitmap image of white?

It's embarrassing to ask this question but can't find an answer. I tried this in vain. Image resultImage = new Bitmap ... C#. 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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341 views

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c# - Attribute routing with optional parameters in ASP.NET Web API

I'm trying to use Web API 2 attribute routing to set up a custom API. I've got my route working such that my function ... = "") { // process } } See Question&Answers more detail:os...

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

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306 views

1 answer

c# - How to deal with a sealed class when I wanted to inherit and add properties

In a recent question on Stack Overflow, I asked how I might parse through a file name to extra meta info ... way to deal with 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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310 views

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c# - Determine if reflected property can be assigned null

I wish to automagically discover some information on a provided class to do something akin to form entry. Specifically ... is not an option. 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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c# - Cannot compare elements of type 'System.Collections.Generic.ICollection`1 Only primitive types, enumeration types and entity types are supported

I have written this code IQueryable<Site> sites = context.MainTable.Include("RelatedTable"); if (!string. ... entity types are supported. See Question&Answers more detail:os...

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

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392 views

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c# - Appending/concatenating two IEnumerable sequences

I have two sets of datarows. They are each IEnumerable. I want to append/concatenate these two lists into one list ... the two Lists. Any ideas? See Question&Answers more detail:os...

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

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637 views

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c# - The server committed a protocol violation. Section=ResponseHeader Detail=CR must be followed by LF, In WinForms?

I am trying to use a WebClient / HttpWebRequest to download some data from a server. I use the following code ... there to fix 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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323 views

1 answer

c# - Remove ClickOnce from a WinForms app

I have a WinForms application that was going to use ClickOnce. But it turns out ClickOnce won't work for my ... hoping there's another way.) See Question&Answers more detail:os...

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

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595 views

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c# - Difference between ToString("N2") and ToString("0.00")

What is the difference between ToString("N2") and ToString("0.00")? See Question&Answers more detail:os...

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

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443 views

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c# - How to read "List Separator" settings from Regional configuration of control panel?

I'm making multi culture plugin for MS Word,Excel where I need to identify setting value provided in Regional ... mail merge header, etc. See Question&Answers more detail:os...

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

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257 views

1 answer

c# - How to go to particular Item in IEnumerable

I have IEnumerable which contains number Data inside it. Edit The IEnumerable is from System.Collection.Ienumerable ... please. Thanks, Subhen See Question&Answers more detail:os...

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

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234 views

1 answer

c# - Get domain name

My computer is in a Domain (Active Directory) and I need to get the domain name dynamically. I ... the UserDomainName returns only something. See Question&Answers more detail:os...

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

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567 views

1 answer

c# - Changing the scheme of System.Uri

I'm looking for canonical way of changing scheme of a given System.Uri instance with System.UriBuilder without crappy ... , query string, etc. See Question&Answers more detail:os...

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

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386 views

1 answer

c# - return type is less accessible than method

I am new to c# and here is an excerpt from a personal project i am working on to get some experience. When ... } return listOfRecipes[i]; } } See Question&Answers more detail:os...

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

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167 views

1 answer

c# - Is there any difference between type? and Nullable<type>?

In C# are the nullable primitive types (i.e. bool?) just aliases for their corresponding Nullable<T> type or ... a difference between the two? See Question&Answers more detail:os...

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

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481 views

1 answer

c# 9.0 - Testing C# 9.0 in VS2019 - CS0518 IsExternalInit is not defined or imported ... How do I define/import it?

EDIT [Nov 29 2020]: .NET 5.0 is out now, but the solution below is still required if you're ... //github.com/dotnet/roslyn/issues/45510 See Question&Answers more detail:os...

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

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508 views

1 answer

c# - StringFormat and Multibinding with Label

I would like to use StringFormat to do someting like this : <Label x:Name="myLabel"> <Label.Content> <Multibinding ... to make this code work ? See Question&Answers more detail:os...

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

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1.5k views

1 answer

c# - How to read HttpResponseMessage content as text

I'm using HttpResponseMessage class as a response from an AJAX call which is returning JSON data from a service ... request); return response; } See Question&Answers more detail:os...

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

0 votes

245 views

1 answer

c# - How do I reference the input of an HTML <textarea> control in codebehind?

I'm using a textarea control to allow the user to input text and then place that text into the body of an e ... .Text; client.Send(message); } See Question&Answers more detail:os...

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

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298 views

1 answer

c# - How do I remove the empty row from the bottom of a DataGridView control?

When I fill a DataGridView with data, there is always an empty row at the bottom. How do I disable 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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695 views

1 answer

c# - Moq ReturnsAsync() with parameters

I'm trying to mock a repository's method like that public async Task<WhitelistItem> GetByTypeValue(WhitelistType type, ... problem. Any clues? See Question&Answers more detail:os...

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

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232 views

1 answer

c# - How to extract custom header value?

I have this exact code from the accepted answer in my project which I need to migrate into ASP.NET Core ... duplicate for that question either. See Question&Answers more detail:os...

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

0 votes

236 views

1 answer

c# - Fastest way to update namespaces with ReSharper?

I have been doing some refactoring and reorganization and I have moved a bunch of files around. I want to update ... in a folder or a project? See Question&Answers more detail:os...

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

0 votes

645 views

1 answer

c# - Cannot perform runtime binding on a null reference, But it is NOT a null reference

using: MVC 4, ASP.NET Razor I'm getting an error that looks like it shouldn't be possible. It tells me ... int, string> de in ViewBag.States) See Question&Answers more detail:os...

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

0 votes

420 views

1 answer

c# - How does one tell if an IDisposable object reference is disposed?

Is there a method, or some other light-weight way, to check if a reference is to a disposed object? P.S. - ... to access a member of the object. See Question&Answers more detail:os...

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

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