Recent questions tagged C#

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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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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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518 views

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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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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)

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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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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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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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246 views

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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)

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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)

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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)

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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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c# - Newline character in StringBuilder

How do you append a new line( ) character in StringBuilder? 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# datatable insert column at position 0

does anyone know the best way to insert a column in a datatable at position 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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302 views

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c# - Find all subsets of a list

I have a list and I need to output each subset of the list for example a b c d e would output to a ... even sure wehre to start any suggestions? 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# - Providing Asynchronous Serial Port Communication

Currently our application connects to an Arduino over a serial port. We send some ASCII-formatted commands, and get the ... to let us .Set 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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545 views

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c# - Flickering in listview with ownerdraw and virtualmode

I'm using listview control with the following parameters set: this.listView1.BackColor = System.Drawing.Color. ... to avoid this behavour? See Question&Answers more detail:os...

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

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259 views

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c# - Download, save( locally ) and display PDF from a link

I am developing Windows phone 8 application. In my application, i have to display PDF file in offline( ... ideas will be greatly appreciated. See Question&Answers more detail:os...

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

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307 views

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c# - Desktop screenshot in WPF

How can I take a screenshot of the desktop in WPF? Preferably with the mouse cursor showing. See Question&Answers more detail:os...

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

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407 views

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c# - Uploading a Azure blob directly to SFTP server without an intermediate file

I'm attempting to upload am Azure blob directly to an SFTP server. It's simple to upload a file from a ... storage directly to an SFTP server? See Question&Answers more detail:os...

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

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418 views

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c# - How to find a black square with any angle of rotation in the image using emgu cv

I need to find the coordinates of three black squares in the test form. I took the example code from the site ... .jpg"); } Input image: 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

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c# - Querying Entity with LINQ using Dyanmic Field Name

I have created a dynamic search screen in ASP.NET MVC. I retrieved the field names from the entity through ... Expression.Lambda(body, cParam); See Question&Answers more detail:os...

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

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279 views

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c# - System wide Windows CBT hook not working properly

I'm trying to hook a CBT hook on Windows OSes. I'm currently using Windows 7 x64. I've read many threads ... a local user (something like VNC). See Question&Answers more detail:os...

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

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320 views

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c# - Calling an ASP.NET EventHandler from JavaScript

I have a traditional ASP.NET Web Form. We used to have a button defined as follows: <asp:Button ID="myButton" ... do this? Thank you so much! See Question&Answers more detail:os...

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

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249 views

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c# - Export ListView to CSV

Is anyone aware of a decent CSV export tool for exporting from a ListView? I need to get a project ... this final feature implemented myself. See Question&Answers more detail:os...

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

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255 views

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c# - Strange behaviour in ASP.NET MVC: removing item from a list in a nested structure always removes the last item

Scenario I have a parent/child model (to be exact a small questionnaire form and a one or more number of contacts). ... Sings { get; set; } } See Question&Answers more detail:os...

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

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235 views

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c# - Firebase authentication asp.net core

After a successful sign-in to Firebase we received a JWT token. In order to add authorization to my asp.net ... wich Auhtority url is correct? See Question&Answers more detail:os...

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

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1.2k views

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c# - Finding clients location in an ASP.NET page

How to find clients location in my ASP.NET page? In fact I used System.Globalization.RegionInfo.CurrentRegion, ... location using any method? See Question&Answers more detail:os...

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

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326 views

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c# - Encrypt connection string in NON ASP.Net applications

I am working with C# & WPF and, of course, an app.config file. I have not been able to find an example of ... (or other data) in an app.config? See Question&Answers more detail:os...

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

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