Recent questions tagged C#

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c# - How to default a null JSON property to an empty array during serialization with a List<T> property in JSON.NET?

Currently I have JSON that either comes in via an HTTP call or is stored in a database but during server ... become an empty array 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# - How to search for specific value in Registry keys

How can I search for specific value in the registry keys? For example I want to search for XXX in ... C# will be appreciated, 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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c# - How to receive a file over TCP which was sent using socket.FileSend Method

I have a client application, and a server one. I want to send a file from one machine to the other, so it ... buffer I can create GB 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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c# - What is simpliest way to get Line number from char position in String?

What is simpliest way to get Line number from char position in String in C#? (or get Position of line ( ... } ? Edited: Added method PosFromLine 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# - schema validation XML

I have an XSD file and an XML file, how can I check if the XML is in the right schema like the XSD file ... S. I'm working inVisual Studio 2010. See Question&Answers more detail:os...

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

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624 views

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c# and java - difference between hmacsha256 hash

I have the following code in Java: byte[] secretKey = secretAccessKey.getBytes("UTF-8"); SecretKeySpec signingKey = ... . Can anyone see 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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c# - Enabling Queue<T> with concurrency

I have a previous question which I have provided my solution; however, I don't have access to ConcurrentQueue<T> ... with a thread-safe Queue? 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# - Create using for own helper? like Html.BeginForm

I was wondering, is it possible to create your own helper definition, with a using? such as the following which ... ? if so, how? 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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c# - DataAdapter.Fill(Dataset)

i try to get some Data from a Access Database via OleDB in a DataSet. But the DataSet is empty after the Fill() ... you all for get it 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 does running several tasks asynchronously on UI thread using async/await work?

I've read (and used) async/await quite a lot for some time now but I still have one question I can't get an ... form"; await Task.Delay(200); } 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 GetModuleFileName() if I only have a window handle (hWnd)?

I'm trying to get the name of the executable of a window that is outside my C# 2.0 application. My app ... ; return (filename.ToString()); } 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 enumerate passed method parameters

One can enumerate the called method parameter types/information like this: private void SomeMethod(int thisValue, string ... and their values. 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# - Hosting ASP.NET Core API in a Windows Forms Application

Background: I am working on a project that involves a WinForms app. The client wants to expose a local-only HTTP ... d have to be wary of? 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 deal with GetDataPresent to let it accept all the derived types

I'm using drgevent.Data.GetDataPresent to determine whether the dragged component is acceptable or not. I've got ... such requirement. Any idea? 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 return JSON from webservice

Morning, I need to return a message from my web service. Below is a sample of my code, and i am returning a string. ... : " + ex.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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238 views

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c# - How to write connection string in web.config file and read from it?

I'm trying to write Connection string to Web.config like this: <connectionStrings> <add name="Dbconnection" ... What is the 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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777 views

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c# - .NET replace non-printable ASCII with string representation of hex code

I have a string with some non-printable ascii characters in it, something like: "ABCDx09x05 " I want to replace these ... ? Can a regex 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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281 views

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c# - Location permission for Android above 6.0 with Xamarin.Forms.Maps

I'm trying to implement a Xamarin.Forms application using Xamarin.Forms.Maps, however I always fall into the exception: Java. ... ????} ????}; See Question&Answers more detail:os...

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

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409 views

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c# - Why can't I use a compatible concrete type when implementing an interface

I would like to be able to do something like this : using System; using System.Collections.Generic; using System ... IEnumerable, like List... See Question&Answers more detail:os...

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

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525 views

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c# - How to I use TryParse in a linq query of xml data?

I'm working with in memory xml of daily stock market data, and I'm getting the value "8/221/19055" for one of ... , (long)s.Element("Volume")); See Question&Answers more detail:os...

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

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250 views

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c# - Why can't static classes have non-static methods and variables?

Why can't static classes have non-static methods and variables when non-static classes can have static ... static class is understandable. See Question&Answers more detail:os...

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

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398 views

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c# - How does a Nullable<T> type work behind the scenes?

I'm curious to know how the Nullable type works behind the scenes. Is it creating a new object(objects can ... opposed to creating it ourself? See Question&Answers more detail:os...

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

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349 views

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c# - Trouble Implementing a Sliding Window in Rx

I created a SlidingWindow operator for reactive extensions because I want to easily monitor things like rolling ... be much 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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c# - Getting custom assembly attributes without loading into current AppDomain

I have created a small application to recursively load assemblies in a provided directory and read their custom attributes ... may need as well. See Question&Answers more detail:os...

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

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225 views

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c# - Load parts of App.Config from another file

I like to split my app.config into a user specific part and an application specific part. Is it ... without changing the application itself? See Question&Answers more detail:os...

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

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352 views

1 answer

c# - Extending ASP.NET Identity Roles: IdentityRole is not part of the model for the current context

I'm trying to use the new ASP.NET Identity in my MVC5 application, specifically I'm trying to integrate ... help would 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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261 views

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c# - Percentage Based Probability

I have this code snippet: Random rand = new Random(); int chance = rand.Next(1, 101); if (chance <= 25 ... checks enough for it to be accurate? See Question&Answers more detail:os...

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

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431 views

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c# - How to automatically generate identity for an Oracle database through Entity framework?

I'm using Oracle provider for Entity framework (beta), and I'm facing a problem. Our tables have Id columns, ... this? Thank you very 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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