Recent questions tagged C#

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c# - How to get the index of the current ItemsControl item?

Is there any way to get the index of the current ItemsControl item in WPF? For example, I want to do something like: < ... "1", third "2" .... 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# - xmlns=''> was not expected. - There is an error in XML document (2, 2)

Im trying to deserialize the response from this simple web service Im using the following code: WebRequest request ... (ws.GetResponseStream()); See Question&Answers more detail:os...

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

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183 views

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c# - What's wrong with casting 0.0 to double?

I have InvalidCastException when I try to cast 0.0 to double, why is that so? It's fine when I do (float)value instead. 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# - ConcurrentDictionary GetOrAdd async

I want to use something like GetOrAdd with a ConcurrentDictionary as a cache to a webservice. Is there an async ... ().GetResponse(); }); See Question&Answers more detail:os...

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

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214 views

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c# - .NET library to print PDF files

I am after a library which can accept an already created PDF file and send it directly to the printer. I don't ... PDF and I want to print 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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269 views

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c# - How to debug a deadlock?

Other than that I don't know if I can reproduce it now that it's happened (I've been using this ... tools/tips/tricks that might 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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c# - How can I accept the backspace key in the keypress event?

This is my code: private void txtAdd_KeyPress(object sender, KeyPressEventArgs e) { if (!(char.IsLetter(e.KeyChar ... backspace. Please help me. 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# - How to unbox from object to type it contains, not knowing that type at compile time?

At the run-time I get boxed instance of some type. How to unbox it to underlying type? Object obj; ... instance of initial variable here; 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# - Table Value optional parameter

Is it possible to create a procedure with a table value parameter as an optional parameter. I tried the following ... sql server with C#.Net 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# - .Net Core warning No XML encryptor configured

When I start my service (API on .Net Core 2.2 in Docker container) I've got a warning: No XML encryptor configured. ... "2.18.6" /> </ItemGroup> See Question&Answers more detail:os...

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

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543 views

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c# - A generic error occurred in GDI+ at System.Drawing.Image.Save

Exception: A generic error occurred in GDI+. at System.Drawing.Image.Save(String filename, ImageCodecInfo encoder, ... the TEMP folder... See Question&Answers more detail:os...

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

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805 views

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c# - HttpWebRequest.GetResponse() keeps getting timed out

i wrote a simple C# function to retrieve trade history from MtGox with following API call: https://data.mtgox.com/ ... of what could be wrong? See Question&Answers more detail:os...

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

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361 views

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c# - Listview inside of scrollviewer prevents scrollviewer scroll

I have a scrollviewer with a couple listboxes in it. The problem is if a user uses the middle mouse roller to ... ideas on how to handle 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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281 views

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c# - Xamarin Android Build Failed "Invalid value for outputAssembly"

A few days ago my solution seemed to work fine, but today all of the sudden the Android project doesn't ... disabled. BarApp.Android 1 Active See Question&Answers more detail:os...

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

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786 views

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c# - Convert UTC DateTime to DateTimeOffset

I need to convert UTC date strings to DateTimeOffsets. This must work with a timezone which differs from the computers timezone. ... 1, 0, 0)); See Question&Answers more detail:os...

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

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547 views

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c# - Do I need to Dispose a SemaphoreSlim

According to the documentation: "a SemaphoreSlim doesn't use a Windows kernel semaphore". Are there any special ... no longer be used? 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

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c# - Wrong line numbers in stack trace

The problem On our ASP .net website I keep getting wrong line numbers in stack traces of exceptions. I am talking ... check, please let me know. See Question&Answers more detail:os...

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

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472 views

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c# - Using Reflection to set a static variable value before object's initialization?

Is there anyway to set the value of a static (private) variable on an object that has not been initialized? The ... a way to get around 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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190 views

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c# - Extension method for List<T> AddToFront(T object) how to?

I want to write an extension method for the List class that takes an object and adds it to the front instead ... ? myList.AddToFront(T 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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590 views

1 answer

c# - WPF MouseDown event not firing everywhere in a control

I am currently fighting against another WPF struggle, namely mouse events. I basically have a very simple control ... happens. Thank you! See Question&Answers more detail:os...

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

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297 views

1 answer

c# - Visual Studio refuses to build project due to missing assembly reference that isn't missing

I'm building a c# windows service and has added a couple of assembly references (to other projects of my own) ... updated in the build stack. See Question&Answers more detail:os...

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

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572 views

1 answer

c# - Parallel.Foreach + yield return?

I want to process something using parallel loop like this : public void FillLogs(IEnumerable<IComputer> computers) { ... ).ToList(); instruction See Question&Answers more detail:os...

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

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369 views

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c# - How to return ActionResult with specific View (not the controller name)

I have a method SendMail in the MVC Controller.This method calls other method ValidateLogin. This is the ... statement? 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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691 views

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c# - If a partial class inherits from a class then all other partial classes with the same name should also inherit the same base class?

I have a class in Model in my MVC project like this. public partial class Manager : Employee { public ... are sharing the same namespace. 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# - Add a msbuild task that runs after building a .NET Core project in Visual Studio 2017 RC

Is there something like the AfterBuild Target in msbuild with .NET Core in Visual Studio 2017 RC? I tried to ... with Visual Studio 2017 RC? See Question&Answers more detail:os...

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

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674 views

1 answer

c# - Return null for FirstOrDefault() on empty IEnumerable<int>?

Say I have the following snippet: int? nullableId = GetNonNullableInts().FirstOrDefault(); Because GetNonNullableInts() ... the list is empty? See Question&Answers more detail:os...

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

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286 views

1 answer

c# - How to use WebClient with .NetCore?

Is there any way to use a WebClient in a .NET Core application? If I build the application I get the ... , but is there any alternative? See Question&Answers more detail:os...

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

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601 views

1 answer

c# - An error occurred while trying to restore packages. Please try again

I am trying to restore the missing nuget packages and it keeps giving me this Error: An error occurred while ... exactly is causing the 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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