Recent questions tagged C#

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c# - How do I allow breaking on 'System.NullReferenceException' in VS2010?

I have a VS 2010 C# .NET 4 project. The issue is that the program is not breaking on ' ... will break on these exceptions? 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# - Can properties inside an object initializer reference each other?

Is it somehow possible for properties to reference each other during the creation of a dynamic object an ... -typed object initializers? See Question&Answers more detail:os...

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

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192 views

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c# - Build JSON response in Web API controller

In a WebAPI project, i have a controller that checks a status of a product, based on a value the user enters. Lets say ... } ] { "status": 0 } 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 it better performance wise to use the concrete type rather than the interface

I have run into some rules (recommendations) to use concrete List and Dictionary rather than IList and IDictionary, ... the internals of .net). See Question&Answers more detail:os...

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

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334 views

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c# - How does Encoding.Default work in .NET?

I'm reading a file using: var source = File.ReadAllText(path); and the character ? wasn't being loaded ... file will be read without problems? See Question&Answers more detail:os...

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

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458 views

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c# - How do I pass the Button as CommandParameter from XAML in a Xamarin.Forms Page?

I would like to pass a Xamarin.Forms.Button in it's own Command as the CommandParameter to my ViewModel. I know ... that didn't work. 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# - Applying css class using Html.DisplayFor inside razor view

Inside razor view I used model for rendering label like @Html.LabelFor(model => model.MyName, htmlAttributes: new { ... 6 is not apply. 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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218 views

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c# - .Net Core Model Binding JSON Post To Web API

Just started a new project using .NET Core. Added my Web API controller and related method. Using Postman I created a ... ) { return Ok(); } 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

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c# - WPF: how do i handle a click on a ListBox item?

In my WPF app I'm handling a ListBox SelectionChanged event and it runs fine. Now I need to handle a click ... a ListBox click on an 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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c# 4.0 - Intersect two arrays

How can I find the intersecttion between 2 arrays in C#, in a fast 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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339 views

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c# - Configuring a custom event log for log4net

I'm using log4net for logging (duh!). Using the EventLogAppender, I can configure my application name, so that my ... = "My application name"; See Question&Answers more detail:os...

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

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255 views

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c# - System.Uri.ToString behaviour change after VS2012 install

After installing VS2012 Premium on a dev machine a unit test failed, so the developer fixed the issue. When the ... 3.5 then it succeeds. See Question&Answers more detail:os...

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

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543 views

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c# - Why can TimeSpan and Guid Structs be compared to null?

I've noticed that some .NET structs can be compared to null. For example: TimeSpan y = new TimeSpan(); if ... 't compare structs to null anyway. See Question&Answers more detail:os...

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

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302 views

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c# - WPF Datagrid binding and column display

I have datatable as Item source for DataGrid, this datatable has lots of columns. Is it possible to display ... without creating a new table? See Question&Answers more detail:os...

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

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233 views

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c# - Should I test that methods don't throw exceptions?

I'm making my first baby steps with unit testing and have written (among others) these two methods: [ ... maybe my interpretation is 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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760 views

1 answer

c# - How to handle deserialization of empty string into enum in json.net

I am deserializing json properties into an enum but I'm having issues handling cases when the property is an ... of throwing a runtime error? 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# - Get a template error when I try to do this?

I am using asp.net mvc 3 and I keep getting this error and I don't understand it since I am ... or single-parameter custom indexer expressions. See Question&Answers more detail:os...

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

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271 views

1 answer

c# - How do I prevent a form object from disposing on close?

I am using an MDIParent Form. When I close its child, the object of the child disposes. Is there a ... to false instead of disposing? See Question&Answers more detail:os...

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

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267 views

1 answer

c# - Weird "assembly not referenced" error when trying to call a valid method overload

I'm using method overloading in Assembly A: public static int GetPersonId(EntityDataContext context, string name) ... ctor overloads added. See Question&Answers more detail:os...

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

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200 views

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c# - Access a Model property in a javascript file?

Is it possible to access a Model property in an external Javascript file? e.g. In "somescript.js" file var ... Is there any way around 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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237 views

1 answer

c# - Why Logging doesn't use string interpolation

I have been following Logging in ASP.NET Core Which is working just fine. I have a question about this line ... log properly in .net core. See Question&Answers more detail:os...

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

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189 views

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c# - Serializing WITHOUT xmlns

I have a couple extension methods that handle serialization of my classes, and since it can be a time ... RemoveAllNamespaces(el))); } See Question&Answers more detail:os...

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

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207 views

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c# - Coloring instance variables in Visual Studio

Is it possible to color instance (and static) variables in C# code in Visual Studio 2010, perhaps using a lightweight ... test = "XYZ"; } } 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

1 answer

c# - Add Multiple Contract Resolver in Newtonsoft.Json

Blueprint for data structure: public class Movie { public string Name { get; set; } } Using Newtonsoft. ... to the Contract Resolver. See Question&Answers more detail:os...

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

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385 views

1 answer

c# - Map System.Uri using Entity Framework Fluent Api

Pretty simple question. I have a model that has a property which is a System.Uri type. Uris don't have a ... to make a wrapper like that. See Question&Answers more detail:os...

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

0 votes

330 views

1 answer

c# - Set cell value using Excel interop

Ok, so I'm trying to set the value of a cell with the excel interop library. I am able to do it with ... on what I'm missing? 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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190 views

1 answer

c# - Splitting/Combining Partial Methods

I understand partial methods can be used to split the definition of a method across multiple files. I'm ... surprised if this were permitted. 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

1 answer

c# - EF Core 'another instance is already being tracked'

I have a problem updating an entity in .Net Core 2.2.0 using EF Core 2.2.3. An error occurred while saving ... ==> With NO tracking on the RIGHT See Question&Answers more detail:os...

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

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