Recent questions tagged C#

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I gather that the async methods are good for IO work because they don't block the thread whilst they're being ... is just moved somewhere else? See Question&Answers more detail:os...

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

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284 views

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c# - why can we declare delegates outside a class? Is it not against OOP concept?

According to oops fundamentels, everything has to be inside a class. Then why are we allowed to create delegates outside a class? See Question&Answers more detail:os...

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

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312 views

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c# - Prevent double-click from double firing a command

Given that you have a control that fires a command: <Button Command="New"/> Is there a way to prevent ... disabling or hiding the button. See Question&Answers more detail:os...

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

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817 views

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c# - Get PropertyType.Name in reflection from Nullable type

I want use reflection for get properties type. this is my code var properties = type.GetProperties( ... , PublicKeyToken=b77a5c561934e089]] See Question&Answers more detail:os...

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

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617 views

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c# - WebAPI cannot parse multipart/form-data post

I'm trying to accept a post from a client (iOS app) and my code keeps failing on reading the stream ... .InternalServerError, e); } } See Question&Answers more detail:os...

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

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313 views

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c# - Some images are being rotated when resized

In a nutshell the purpose of the following code is to resize an image based on the target size and the multiplier ... it to be a viewer 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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272 views

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c# - How to add external assembly (.dll) to .NET Core 2.0 on Visual Studio Code

I faced some issues regarding adding an external assembly (.dll) to my .NET Core 2.0 console application on ... how to add external dlls. See Question&Answers more detail:os...

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

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281 views

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c# - Check if two list have the same items

I have two lists as below, how can I say that they have the same elements. The order is not important. var ... there a built-in method for 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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c# - NullReferenceException in System.Threading.Tasks calling HttpClient.GetAsync(url)

I have a strange problem in my MVC 4.0 application. I use REST web services (Amazon Associate) . I created ... ? Thanks for your help, Bernard. See Question&Answers more detail:os...

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

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215 views

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c# - How do define get and set for an array data member?

I am making a class Customer that has the following data members and properties: private string customerName; private ... the array data member? See Question&Answers more detail:os...

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

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506 views

1 answer

c# - Upload to PHP server from c sharp client application

Currently i have a c sharp application (Client app). and a web application written php. I want to transfer some ... it? Am i missing 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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206 views

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c# - How can I convert a lambda-expression between different (but compatible) models?

(based on an email conversation, now recorded for information sharing) I have two models used at different layers: ... using the Test type) ? See Question&Answers more detail:os...

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

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288 views

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c# - Compiler generated sealed class for delegate keyword contains virtual methods

When delegate keyword is used in C#, the C# compiler automatically generates a class derived from System. ... invocation of these methods? 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

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c# - BackgroundWorker - Cross-thread operation not valid

I have a winform application (one form), on this form there is a RichTextBox. In the constructor of this ... , ProgressChangedEventArgs e){} } See Question&Answers more detail:os...

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

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458 views

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c# - SwitchToThread vs Sleep(1)

I'm wondering what's the actual difference between calling Thread.Sleep(1) and calling SwitchToThread (if we ignore that it ... ? (if at all..) See Question&Answers more detail:os...

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

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490 views

1 answer

c# - Using reflection to get all classes of certain base type in dll

I have a dll that contains a number of classes that all inherit from a CommandBase class. I'm trying to get ... it to CommandBase isn't enough. See Question&Answers more detail:os...

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

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476 views

1 answer

c# - JSON.NET Abstract / Derived Class Deserialization with WebAPI 2

I'm implementing a Web API 2 service that uses JSON.NET for serialization. When I try to PUT ( deseralize ... and come up with anything? See Question&Answers more detail:os...

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

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376 views

1 answer

c# - Why IEnumerable slow and List is fast?

Came across this code. var dic = new Dictionary<int, string>(); for(int i=0; i<20000; i++) { dic.Add( ... I know linq to sql laziness and stuff. See Question&Answers more detail:os...

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

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530 views

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c# - Azure ServiceBus Message Serialization/Deserialization

I am using a .NET Core application to send an object through an Azure Service Bus Queue and have it received ... message, TextWriter log) { } See Question&Answers more detail:os...

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

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558 views

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c# - Azure Function with AD auth results in 401 Unauthorized when using Bearer tokens

I have a very simple Azure function in C# for which I've setup Azure AD Auth. I've just used the Express ... into a 401 when calling my API. See Question&Answers more detail:os...

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

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571 views

1 answer

c# - HttpContext.Current is null in an asynchronous Callback

Trying to access the HttpContext.Current in a method call back so can I modify a Session variable, however ... to Integrated/Classic mode? See Question&Answers more detail:os...

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

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376 views

1 answer

c# - Deserializing JSON - how to ignore the root element?

I'm consuming a WCF service that returns JSON results wrapped inside the 'd' root element. The JSON response ... or something like 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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1.0k views

1 answer

c# - Overlay image onto PDF using PDFSharp

Can't seem to find much out there for this. I've a PDF, onto which I'd like to overlay an image ... to accomplish that using PDFSharp? 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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508 views

1 answer

c# - How to execute a WiX custom action DLL file with dependencies

I want to create a CustomAction C# DLL file that depends on a third-party .NET DLL (in this specific case, ... with the third-party DLL file? See Question&Answers more detail:os...

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

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261 views

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c# - Volatile Violates its main job?

According to MSDN: The volatile keyword indicates that a field might be modified by multiple threads that are ... of such weird behavior ? See Question&Answers more detail:os...

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

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308 views

1 answer

c# - Suppress first chance exceptions

Is it possible to suppress first chance supressions in Visual Studio (C# debugger) for specific lines of code? I ... hassle and a time sink. 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# - Authentication method 'caching_sha2_password' not supported by any of the available plugins

When I try to connect MySQL (8.0) database with Visual Studio 2018 I get this error message "Authentication method ... possible way to fix 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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323 views

1 answer

c# - How does BinaryFormatter.Deserialize create new objects?

When BinaryFormatter deserializes a stream into objects, it appears to create new objects without calling constructors. ... are actually 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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