Recent questions tagged C#

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I'm customising a .csproj project to run some custom tasks before the main build. However, I can't get ... .CSharp.targets file is specified. 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 modify a foreach iteration variable from within foreach loop?

When I try to do this... Item[,] array = new Item[w, h]; // Two dimensional array of class Item ... default Item class values to existing item. See Question&Answers more detail:os...

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

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380 views

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c# - Combining URIs and Paths

I am retro-fitting an application to make use of a PHP HTTP proxy (for caching) instead of the actual API ... mark both answers as correct. 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# - Can't open excel file generated with excelLibrary

I'm using excelLibrary to programatically create excel files but I get a file format error when I try to open ... not run into 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# - record types with collection properties & collections with value semantics

In c# 9, we now (finally) have record types: public record SomeRecord(int SomeInt, string SomeString); This ... 't provide this feature either. See Question&Answers more detail:os...

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

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328 views

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c# - Return Tuple from EF select

How can I retrieve Tuples at Select using EF4? var productCount = (from product in context.products select new ... .Create method for second. 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# - Maximum length of cache keys in HttpRuntime.Cache object?

We are using HttpRuntime.Cache API in an ASP.NET to cache data retrieved from a database. For this ... into some performance/memory 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# - Cannot insert the OpenXmlElement "newChild" because it is part of a tree

The Title states the error I am getting. I'm trying to hide all the text in a word doc using OpenXml. ... para.ParagraphProperties = pp; } } 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 resize a picture to a specific file size?

I would like to resize a picture to a specific file size. For example, no more than 200KB. What is the best ... this with C# .NET ? 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# - Entity Framework relationships between different DbContext and different schemas

So, I have two main objects, Member and Guild. One Member can own a Guild and one Guild can have ... .Added; await context.SaveChangesAsync(); See Question&Answers more detail:os...

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

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230 views

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c# - Double.Parse - Internationalization problem

This is driving me crazy. I have the following string in a ASP.NET 2.0 WebForm Page string s = "0.009"; ... ; formatted is now 0,009. Anybody? See Question&Answers more detail:os...

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

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453 views

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c# - "The maximum string content length quota (8192) has been exceeded while reading XML data" error while sending XML string to WCF

I am working with a .NET, C# application which intends to send a long XML string to a WCF Service method for ... . Thanks to all in advance. See Question&Answers more detail:os...

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

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224 views

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c# - Why does this generics scenario cause a TypeLoadException?

This got a bit long-winded, so here's the quick version: Why does this cause a runtime TypeLoadException? ... it intentionally works this way. 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 are normal people supposed to persist settings in a Windows Phone 8 app?

I'm in the process of writing a Windows Phone 8 app, so I can capture that much sought-after 3% market ... something simple I'm not finding? See Question&Answers more detail:os...

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

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405 views

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c# - How to remotely control a Windows Service with ServiceController?

I'm trying to control Windows Services that are installed in a remote computer. I'm using the ServiceController ... both running Win XP Pro. See Question&Answers more detail:os...

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

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269 views

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c# - SelectList with a null selection

I have a bunch of drop down lists in my view, such as this one: @Html.DropDownListFor(model => model. ... a null selection to the SelectList> See Question&Answers more detail:os...

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

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324 views

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c# - Why optional parameters must appear at the end of the declaration

In all programming languages supporting optional parameters that I have seen there is a imitation that the ... compiler/interpreter requirement. See Question&Answers more detail:os...

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

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424 views

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c# - WPF App Using new csproj format

I am experimenting with migrating a WPF project, defined using the old csproj format, to the new format under VS ... compile App.xaml.cs twice. See Question&Answers more detail:os...

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

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391 views

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c# - Json.net deserializing list gives duplicate items

I have just started using Newtonsoft.Json (Json.net). In my first simple test, I ran into a problem when ... still haven't figured it out. See Question&Answers more detail:os...

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

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743 views

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c# - Deserializing nested JSON structure to a flattened class with Json.NET using annotations

Is it possible to use JsonProperty annotation to map a nested Json property to a non-nested .NET member? Say you've ... { get; set; } } See Question&Answers more detail:os...

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

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548 views

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c# - Datetime.now as TimeSpan value?

I need the current Datetime minus myDate1 in seconds. DateTime myDate1 = new DateTime(1970, 1, 9, 0, 0, ... these to values in seconds. See Question&Answers more detail:os...

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

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689 views

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c# - Sequence contains no matching element - EntityFramework

I'm using EF 6.1.0 and was creating a WCF Service. First I created a Class Library containing my ... using Code First Entity Framework. 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# - Testing - Connection string is missing

Visual studio created a unit test project for me based on a method (right-click add test). When I try to access ... ; } 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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1.2k views

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c# - HttpClient PostAsync() never return response

My problem is very similar to this question here. I have an AuthenticationService class that makes an HttpClient PostAsync( ... .Read(); } } See Question&Answers more detail:os...

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

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241 views

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c# - How do I make a struct immutable?

All over Stack Overflow and the internet I see that it is a good design principle to keep structs immutable. ... field2, field3String); } } See Question&Answers more detail:os...

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

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497 views

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c# - How to reference a generic type in the DataType attribute of a DataTemplate?

I have a ViewModel defined like this: public class LocationTreeViewModel<TTree> : ObservableCollection<TTree>, ... I do that? See Question&Answers more detail:os...

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

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517 views

1 answer

c# - Using ConfigureAwait(false) on tasks passed in to Task.WhenAll() fails

I'm trying to decide how to wait on all async tasks to complete. Here is the code I currently have [HttpGet] ... .WhenAll() in the current 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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444 views

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c# - Adding a TimeSpan to a given DateTime

I just want to add 1 day to a DateTime. So I wrote: DateTime date = new DateTime(2010, 4, 29, 10, 25 ... getting the initial date. What's wrong? See Question&Answers more detail:os...

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

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