Recent questions tagged .NET

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.net - How to mix colors "naturally" with C#?

I have to mix some colors in a natural way. This means blue + yellow = green blue + red = purple And so ... back to RGB and return that color. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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.net - System.BadImageFormatException: Could not load file or assembly (from installutil.exe)

I am trying to install a Windows service using InstallUtil.exe and am getting the error message System. ... an incorrect format.. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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371 views

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.net - EF LINQ include multiple and nested entities

Ok, I have tri-leveled entities with the following hierarchy: Course -> Module -> Chapter Here was the ... be highly appreciated. Thanks! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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611 views

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.net - What causing this "Invalid length for a Base-64 char array"

I have very little to go on here. I can't reproduce this locally, but when users get the error I get an ... like to know what you found out. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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284 views

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.net - Instantiating a python class in C#

I've written a class in python that I want to wrap into a .net assembly via IronPython and instantiate in a ... to instantiate this class in C#? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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430 views

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.net - How to access property of anonymous type in C#?

I have this: List<object> nodes = new List<object>(); nodes.Add( new { Checked = false, depth = 1, id = " ... ... but it doesn't work. Thanks See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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358 views

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.net - WebClient vs. HttpWebRequest/HttpWebResponse

It seems to me that most of what can be accomplished with HttpWebRequest/Response can also be accomplished ... cannot accomplish with WebClient? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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405 views

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.net - What does "yield break;" do in C#?

I have seen this syntax in MSDN: yield break, but I don't know what it does. Does anyone know? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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293 views

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.net - Contract-First SOA: Designing Business Domain: WCF

I am building a completely new system using WCF. I am going to use Contract-First Approach for a service which ... does it belong in a Service? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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298 views

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.net - Start a Task in the Form Shown event

I want to bind a ComboBox to an EF Core entity of 53k rows. This takes some time, around 10 seconds. I ... back to the the main thread? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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285 views

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.net - Using SynchronizationContext for sending events back to the UI for WinForms or WPF

I'm using a SynchronizationContext to marshal events back to the UI thread from my DLL that does a lot of ... makes enough sense to follow. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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316 views

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.net - What problem does IStructuralEquatable and IStructuralComparable solve?

I've noticed these two interfaces, and several associated classes, have been added in .NET ... IStructuralEquatable and IStructuralComparable? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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793 views

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.net - A connection was successfully established with the server, but then an error occurred during the pre-login handshake

I am getting following error when i am trying to connect Production DB from Local Environment. I was able to ... might have gone wrong here? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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258 views

1 answer

.net - How to write an image from byte[] into MS WORD using C# Windows application

I have tried to write data from FileStream, StreamWriter to a word file. It's working fine when the data is text format( ... 're creating a document oDoc.Close(); oWord.Quit(); }...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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332 views

1 answer

.net - How to convert date format in vb.net?

I am getting xml response date format string is "MM/dd/yyyy h:mm:ss a" but I need convert other date ... net? Please give me any suggestion. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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316 views

1 answer

.net - LINQ, can't join to string

I have a list of users, each user has list of questions. In my model list of questions should be in string ... . How to get it correctly? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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883 views

1 answer

.net - "The calling thread must be STA, because many UI components require this" error when creating a WPF pop-up Window in thread

I have a WPF application in which a thread checks some value. In certain cases, I show a pop-up Window in ... ; })); Messagethread.Start(); See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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482 views

1 answer

.net - Pixel behaviour of FillRectangle and DrawRectangle

nearly every time I use Graphics.DrawRectangle or Graphics.FillRectangle (the int versions) I seem to miss the pixels ... they behave this way? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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370 views

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.net - Unable to load DLL 'SqlServerSpatial.dll'

I have a .NET MVC web application referencing System.Data.Spatial so I can use the DbGeography datatype on ... else encountered this issue? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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611 views

1 answer

.net - ERROR : [Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified

While connecting .net to sybase server I got this error message: [Microsoft][ODBC Driver Manager] Data source ... .net 2005. Any suggestions? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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420 views

1 answer

.net - Identifying a custom indexer using reflection in C#

I have a class with a custom indexer like so public string this[VehicleProperty property] { // Code } How ... typeof(MyClass).GetProperties()? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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462 views

1 answer

.net - Why c# decimals can't be initialized without the M suffix?

public class MyClass { public const Decimal CONSTANT = 0.50; // ERROR CS0664 } produces this error: error CS0664: ... . It seems weird to me. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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373 views

1 answer

.net - Why is a SQL float different from a C# float

Howdy, I have a DataRow pulled out of a DataTable from a DataSet. I am accessing a column that is defined in ... explain what I am missing here? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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519 views

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.net - Warm-up when calling methods in C#

I just came across this post that talks about time measuring. I remember (I hope I'm not misremembering) it's ... extension one (a static one)? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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425 views

1 answer

.net - How Can I add properties to a class on runtime in C#?

I have a class : class MyClass { } ... MyClass c = new MyClass(); Is it possible to add properties ... but it uses interface Thanks in advance. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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318 views

1 answer

.net - Use a StyleSelector for a button

I have a requirement to change a button's style based on a value in the data. It looks like a StyleSelector ... Maybe even a pure XAML approach? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

368 views

1 answer

.net - Count regex replaces (C#)

Is there a way to count the number of replacements a Regex.Replace call makes? E.g. for Regex.Replace("aaa", ... twice. Is there a better way. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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364 views

1 answer

.net - Optimum file buffer read size?

I am writing an application which needs to read fairly large files. I have always wondered what's the optimum ... know what sizes are common? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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