Recent questions tagged C#

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c# - how to set the default value to the drop down list control?

I have a drop down list control on my web page. I have bind the datatable to the dropdownlist control as follows ... field. how to 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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649 views

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c# - WebClient is very slow

I have problem with Webclient. It is very slow. It takes about 3-5 seconds to downloadString from one ... and receiving few thousands packets. See Question&Answers more detail:os...

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

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365 views

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c# - How to use the CanExecute Method from ICommand on WPF

How does one use the CanExecute Method from the ICommand interface? In my example i have a SaveCommand which i ... self when isSaveable is true. See Question&Answers more detail:os...

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

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346 views

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c# - How to check FTP connection?

Is there a simple, fast way to check that a FTP connection (includes host, port, username and password) is valid ... I'm using C#. 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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511 views

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c# - Why System.Array class implements IList but does not provide Add()

This code: int[] myArr = { 1, 2 }; myArr.Add(3); throws the following error on Build: error CS1061: 'System ... , IndexOf()... just a thought. See Question&Answers more detail:os...

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

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287 views

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c# - Passing body content when calling a Delete Web API method using System.Net.Http

I have a scenario where I need to call my Web API Delete method constructed like the following: // DELETE: api/ ... ); } } return retVal; } 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# - Injecting arrays with Unity

My goal is to constructor inject an array of objects implementing an interface. The following is the way I ... to accomplish the same thing? See Question&Answers more detail:os...

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

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856 views

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c# - Threadsafe FIFO Queue/Buffer

I need to implement a sort of task buffer. Basic requirements are: Process tasks in a single background thread ... dequeued.execute(); } } 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 put SET IDENTITY_INSERT dbo.myTable ON statement

What I need to do is have a SET IDENTITY_INSERT dbo.myTable ON statement, what's the syntax of using the above statement in a c# app? 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# - Strange System.__Canon exception

I have a windows service that uses a singleton class ThreadQueue<T>. When the service starts it makes a call to ... ? Can anyone shed any light? See Question&Answers more detail:os...

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

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358 views

1 answer

c# - OpenXml Excel: throw error in any word after mail address

I read Excel files using OpenXml. all work fine but if the spreadsheet contains one cell that has an address ... a hyperlink in the document. See Question&Answers more detail:os...

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

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520 views

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c# - LINQ - filter child collection

I'd like to be able to query parent entities and filter the contents of a child collection. For example, ... advance for any suggestions. Paul See Question&Answers more detail:os...

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

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239 views

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c# - How to XML Serialize a 'Type'

How do I serialize a 'Type'? I want to serialize to XML an object that has a property that is a type ... [XmlInclude]? Is this even possible? See Question&Answers more detail:os...

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

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287 views

1 answer

c# - How can I convert a Control's appearance to an image?

I want a user to be able to drag a Control while showing it. I can't seem to find a way to convert its ... to have that as the dragging icon). 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# - Constructor Overloading with Default Parameters

I accidentally overloaded a constructor in C# as follows: public MyClass(string myString) { // Some ... functionality syntactically allowed? See Question&Answers more detail:os...

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

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696 views

1 answer

c# - WPF ListBox turn off hover effect

I've found and tried many solutions on the internet which should allow me to disable the hover effect of my WPF ... the parents style 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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382 views

1 answer

c# - Why is writing to a 24-bit struct not atomic (when writing to a 32-bit struct appears to be)?

I am a tinkerer-no doubt about that. For this reason (and very little beyond that), I recently did a ... ; clarity 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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308 views

1 answer

c# - Field xxx is never assigned to, and will always have its default value null

Anyone know whats this problem? I got this warning Field xxx is never assigned to, and will always have its default value ... /// Flag used to indicate whether a single pass or two...

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

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751 views

1 answer

c# - Using Blowfish Encryption within .NET

I am working on a project where I need to undertake Blowfish encryption and decryption. Is there anything out ... suitable. Any ideas? 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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253 views

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c# - What is the equivalent of "CASE WHEN THEN" (T-SQL) with Entity Framework?

I have a Transact-SQl request that I use a lot and I want to get the equivalent with Entity Framework. But I don' ... how to do this with EF ? See Question&Answers more detail:os...

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

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344 views

1 answer

c# - Writing JSON to a stream without buffering the string in memory

I would like to write JSON to a Stream by building the document up explicitly. For example: var stream = ...; ... and haven't found a solution. See Question&Answers more detail:os...

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

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794 views

1 answer

c# 4.0 - can one convert a dynamic object to an ExpandoObject (c#)

I am getting an dynamic object of type "Sealed Class" from a driver api (in dll). I want to decorate this object ... as to how to do this. 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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242 views

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c# - Select DataGridCell from DataGrid

I have a DataGrid WPF control and I want to get a specific DataGridCell. I know the row and column indices. ... will be a TextBlock 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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420 views

1 answer

c# - LayoutKind.Sequential not followed when substruct has LayoutKind.Explicit

When running this code: using System; using System.Collections.Generic; using System.Linq; using System.Text; using ... apply to unsafe code? See Question&Answers more detail:os...

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

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459 views

1 answer

c# - WebApi + Simple Injector + OWIN

I am trying to use SimpleInjector with OWIN in a WebAPI project. However, the following line in ConfigureAuth fails ... how can I resolve 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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579 views

1 answer

c# - Getting type from a symbol in roslyn

What is the best general purpose way to get a System.Type from Microsoft.CodeAnalysis.ISymbol for different ... .GetDeclaredSymbol(obj.Node); See Question&Answers more detail:os...

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

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462 views

1 answer

c# - ASP MVC FIle Upload HttpPostedFileBase is Null

In my controller I have, because I wanted to be able to fill out some details about the video and actually upload ... file is null. Any ideas? See Question&Answers more detail:os...

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

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335 views

1 answer

c# - List<T> concurrent removing and adding

I am not too sure, so i thought i'd ask. Would removing and adding items to a System.Collections.Generic.List<> ... with it's Foreach<> 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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