Recent questions tagged C#

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c# - How to merge rows in a DataTable when data in multiple columns match?

I am trying to figure out a good way to merge rows in a DataTable when column1, column2, column3, column4 match. Does ... | 6.50 | 102.09 | 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# - Remove fields from JSON dynamically using Json.Net

I have some JSON input, the shape of which I cannot predict, and I have to make some transformations (to ... any other client-specified data. 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 use inherited properties in EF Core expressions?

We need construct expression for EF in dynamic way. For example create test models: public class TestBase { public ... to solve this 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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c# - Event declaration with assignment to empty delegate

I have question on a piece of code I often stumble across online. For example public static event Action< ... a delegate with empty parenthesis? 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# - Reusing a BackgroundWorker, cancel and wait for it

Suppose you have a search textbox and have a search algorithm attached to the TextChanged event, that runs ... bgw_Search.RunWorkerAsync(); } See Question&Answers more detail:os...

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

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612 views

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c# - Error : Type could not be marshaled because the length of an embedded array instance does not match the declared length in the layout

i am using a COM dll in my C# Project. I have one USERINFO Structure in my COM dll which looks like : ... . Any help is 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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512 views

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c# - double.Parse throw a System.FormatException

I am trying to parse some string to a double value, using this parse method overload: double.Parse("198. ... What can be the reason? See Question&Answers more detail:os...

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

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336 views

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c# - custom dialog with a text field in winmobile

I'm looking to have a simple custom dialog box, like a message box, that has a label and a TextBox. If ... stuff. Thanks for any help, guys! 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 a Dictionary of custom type values as a regular JSON object from a WCF REST method?

Let's say I've got a custom type that looks like this: [DataContract] public class CompositeType { [DataMember] ... .Net REST clients to parse. 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 convert a string containing escape characters to a string

I have a string that is returned to me which contains escape characters. Here is a sample string "test40gmail.com" As ... " How can 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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786 views

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c# - Webbrowser control with Transparent background

I am working on Windows phone 8 app. This is my code: i am binding the data in the XAML: <phone:WebBrowser ... 0;"> but its not working. See Question&Answers more detail:os...

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

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446 views

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c# - How to accomplish FIFO with Azure service bus topics

Have been looking for a Message bus with publish/subscribe functionality. Found that AWS SQS does not support ... would 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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316 views

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c# - Entity Framework 4 TPH inheritance, how to change one type into another?

I have found some information regarding this but not enough for me to understand what the best practice for is for this ... in #1 and #2 above. See Question&Answers more detail:os...

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

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282 views

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c# - StackOverflow Exception from get and set

I have the following code: namespace QuantStrats { class Program { static void Main(string[] args) { string ... why exactly this is 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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285 views

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c# - The database cannot be opened because it is version 706. This server supports version 655 and earlier. A downgrade path is not supported

I have database files in my App_Data folder and my web config looks like this <?xml version="1.0"?> <!- ... my question how to fix this 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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174 views

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c# - How to use Gradle in Unity

Since I want to add Firebase to my Android Game I want to include Google Auth. But I have the following ... implement the Code from the Link? See Question&Answers more detail:os...

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

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216 views

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c# - How to undo Response.Cache.SetNoStore()?

I've a CMS application code which calls Response.Cache.SetNoStore() on all request and if i'm correct, this ... is this appended to the header? See Question&Answers more detail:os...

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

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306 views

1 answer

c# - Fastest safe sorting algorithm implementation

I spend some time implementing a quicksort algorithm in C#. After finishing I compared the speed of my ... value would improve performance? 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

1 answer

c# - Why Regex IsMatch() hangs

I have an exepression to validate an email address: string REGEX_EMAIL = @"^w+([.!#$\%&'*+-/=?^`{|}~] ... to raise speed of this method? 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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357 views

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c# - MoreLinq maxBy vs LINQ max + where

I am using EF5 with the MoreLinq extenstion, while testing my program in production (very big database), I ... records from the database)? See Question&Answers more detail:os...

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

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184 views

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c# - Can I bind a WPF control to a field's property?

Because I needed to split some functionality between classes, I've arrived at the following situation xaml code < ... anyone have an 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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502 views

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c# - What does "Invalid managed/unmanaged type combination." mean?

I have the following struct: [StructLayout(LayoutKind.Auto,Pack=0)] private unsafe struct BIRDSYSTEMCONFIG { ... All suggestions welcome! See Question&Answers more detail:os...

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

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187 views

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c# - How can I execute code after my form starts?

I'm really new to Windows Forms programming and not quite sure what's the right way to go about programming. This ... on the form on the fly? See Question&Answers more detail:os...

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

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180 views

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c# - How to determine file type?

I need to know if my file is audio file: mp3, wav, etc... 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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327 views

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c# - Fading sound in/out

I have a background sound playing in an endless loop. I want it to fade out when the user does press a ... Does anyone knows a better 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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597 views

1 answer

c# 4.0 - How to collect errors during run time given by a parser in Antlr4

I have upgraded from Antlr 3 to Antlr 4. I was using this code to catch exceptions using this code. But ... error messages don't they? See Question&Answers more detail:os...

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

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221 views

1 answer

c# - Post ASP.Net Form data to another page

I have an ASP.Net Page, aspx with its default form. I have a Submit Button for it. Upon clicking, it will post ... . Is there anyway to do 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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494 views

1 answer

c# - How to add a new JProperty to a JSON based on path?

There is a large JSON file (about a thousand lines). The task is to update existing JProperties, or ... the iteration could be parameterised. See Question&Answers more detail:os...

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

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