Recent questions tagged C#

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c# - Violation of primary key Entity Framework Code First

I have started with C# and I wanted to make my own DB. I have two models public class AModel { public ... help me with this simple example? 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 identify if a drive is virtual or physical

This came up from my other question about IMAPI2 is it possible to identify if a DVD/CD drive is virtual and not physical? 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# - ASP.NET automatically converts & to &

Minor issue, but it's driving me nuts nonetheless. I'm building a url for a <script> tag include to be rendered on ... ? My OCD can't take 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# - Error - SqlDateTime overflow. Must be between 1/1/1753 12:00:00 AM and 12/31/9999 11:59:59 PM

i have an app written for 2008. We are using linq to entities. We've now had to switch the DB to 2005. I ... this line to make this query run? 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# - System.Web.Http missing in .net Core 2.1

System.Web.Http is missing in my .net core 2.1 project. the error states Error CS0234 The type or namespace ... refer the image for more clarity 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 set named argument for string.Format?

I have C# error when calling: string.Format(format:"abbccc", 1,22); The error is "Named argument ... prefer to use named parameters. 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# - sometimes I want to hide buttons in a DataGridViewButtonColumn

I have a DataGridView which was the subject of a previous question (link). But sometimes the Button is null. This is ... ].Value).Text; } } } 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 write not equal operator in linq to sql?

using (RapidWorkflowDataContext context = new RapidWorkflowDataContext()) { var query = from w in context. ... not equal LastStateID 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# - Kill process on remote machine

I'm trying to kill a process on a remote machine. But I get error. What am I doing wrong and ... . at System.Diagnostics.Process.EnsureState 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# 2.0 - How to execute a .bat file from a C# windows form app?

What I need to do is have a C# 2005 GUI app call a .bat and several VBScript files at user's request. ... proc.Start(); proc.WaitForExit(); 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 the best way to compare XML files for equality?

I'm using .NET 2.0, and a recent code change has invalidated my previous Assert.AreEqual call (which ... you compare two XML Documents? 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# - Is there a function in Entity Framework that translates to the RANK() function in SQL?

Let's say I want to rank my customer database by country. In SQL I would write: select CountryID, CustomerCount = ... So how should I do 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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505 views

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c# - Prevent Property from being serialized

I tried something like this: [NonSerialized] private string _DecodeText; public string DecodeText { get { return ... property from serializing? See Question&Answers more detail:os...

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

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420 views

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c# - Confusing If Statement?

I always use If statement (In C#) as (1. Alternative); if (IsSuccessed == true) { // } I know that there ... What is the best usage, 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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c# - automapper Missing type map configuration or unsupported mapping.?

ERROR Missing type map configuration or unsupported mapping. Mapping types: ... ? 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# - Base Class type for ILogger<T> using Dependency Injection

I have a base class that does some work, including logging. I have an ILogger dependency injected into the ... one as the base 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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563 views

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c# - How can I get a screen resolution of Device (Windows Phone)

How can I get a screen resolution of Device from settings (Windows Phone) ? See Question&Answers more detail:os...

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

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788 views

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c# - Different NuGet package based on operating system

I have a test project in dotnet 2.1 that needs to work across multiple platforms (specifically, windows and ... trying to build the 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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672 views

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c# - Format of the initialization string does not conform to to specification starting at index 0

I am using Microsoft Enterprise Lip I I have this method to Insert resource in the website I get this ... .cs:line 54 InnerException: See Question&Answers more detail:os...

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

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823 views

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c# - NotifyIcon.ShowBalloonTip not keeps timeout

I show notify information: notifyIcon.ShowBalloonTip(29000, "title", "message", ToolTipIcon.Info); It should show 29 ... show? Use windows 7. See Question&Answers more detail:os...

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

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448 views

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c# - Working around lack of partial generic type inference with constraints

I have an interface (which is used by repositories) that has this member: T FindById<T, TId>(TId id) where T : ... this issue (or can't 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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402 views

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c# - Constant value not changing when recompiling referenced assembly

I have this code in an assembly: public class Class1 { public const int x = 10; } and in a different ... main function. Why is this happening? See Question&Answers more detail:os...

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

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765 views

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c# - How to refresh PictureBox

I've little question to ask. Let's say I've written an ellipse on pictureBox, then clicked a button. I want ... made it. My best regards... See Question&Answers more detail:os...

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

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574 views

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c# - Is there anything like Enumerable.Range(x,y) in Java?

Is there something like C#/.NET's IEnumerable<int> range = Enumerable.Range(0, 100); //.NET in 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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495 views

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c# - Load Connection String from Config File in Azure Functions

In my Azure Function I am using a Library which establishes a connection to an SQL server via the ConnectionString from the ... )\MS..." } } 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# - Why implement IEnumerable(T) if I can just define ONE GetEnumerator?

Update: I appreciate all of the comments, which have essentially comprised unanimous opposition. While every objection raised ... it's right on. See Question&Answers more detail:os...

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

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383 views

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c# - MIssing method in System.Web.Http.ApiController.get_Request()

I have a controller. public sealed class AccountsController : BaseApiController { private readonly IDatabaseAdapter _databaseAdapter; ... >(); } See Question&Answers more detail:os...

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

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512 views

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c# - While trying to retrieve the authorization groups, an error (5) occurred

This error is what I get if I run the application on the server, but not locally. Why is ... , Boolean includeStagesAfterAsyncPoint) +2428 See Question&Answers more detail:os...

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

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