Recent questions tagged C#

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c# - a concern about yield return and breaking from a foreach

Is there a proper way to break from a foreach such that the IEnumerable<> knows that I'm done and it should ... the foreach before i'm finished? 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 do you force constructor signatures and static methods?

Is there a way of forcing a (child) class to have constructors with particular signatures or particular static methods ... of C# or Java? See Question&Answers more detail:os...

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

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370 views

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c# - AM/PM to TimeSpan

I want to achieve the converse of this, that is, I want to convert a string with format hh:mm tt to a TimeSpan ... pm is converted to 21:45:00. 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# - Check if the path input is URL or Local File

I'm working in xmldataprovider and we have configuration value "source" this value may be local file or url like c: ... in code I'm working c# See Question&Answers more detail:os...

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

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254 views

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c# - How to name tuple properties?

How and "could be" organized return from the method which returns tuple type with the name of parameters, ... without new named type. See Question&Answers more detail:os...

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

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817 views

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c# - MessageBox.Show-- font change?

I'm using the MessageBox class to show errors to users, and while that might not be the right behavior, it ... increase the dialog size? 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# - asp.net mvc 3 razor. navigate to view on table tr click

I have users list table how i can navigate on url: "../users/showprofile?userid=" I want to make ... navigate on current user profile 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# - CreatedOn column in Entity Framework 6

After upgrading to Entity Framework 6 we've implemented our own DbExecutionStrategy. In addition to existing ... ,?CommandBehavior?behavior) 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 cast JObject in JSON.Net to T

I know that I can use JsonConvert.DeserializeObject<T>(string), however, I need to peek into the object's ... ) throw new MyBaseError(obj); 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# - This operation would create an incorrectly structured document

I am new to XML and tried the following but I'm getting an exception. Can someone help me? The exception is This ... ))); doc.Save(strPath); } See Question&Answers more detail:os...

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

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309 views

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c# - what does NaN mean for doubles?

What's the difference between NaN and Infinity? When does NaN appear? What is 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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325 views

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c# - Does adding [Serializable] to the class have any performance implications?

I need to add the [Serializable] attribute to a class that is extremely performance sensitive. Will this attribute ... operation of the class? 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# - System.Reflection GetProperties method not returning values

Can some one explain to me why the GetProperties method would not return public values if the class is setup ... be a maintenance nightmare. See Question&Answers more detail:os...

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

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582 views

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c# - Close a filestream without Flush()

Can I close a file stream without calling Flush (in C#)? I understood that Close and Dispose calls the Flush method first. See Question&Answers more detail:os...

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

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183 views

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c# - Building a .NET Core app via command line, so that it works on a machine without .NET Core installed

My end goal is to create a cross-platform (non-web) console application, so I'm exploring .NET Core right ... command line tools' issue tracker. See Question&Answers more detail:os...

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

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354 views

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c# - Centering text vertically and horizontally in TextBlock and PasswordBox in windows store app

I am trying to center the text in a TextBlock and PasswordBox. In TextBlock I use TextAlignment Property to center ... , how to achieve 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# - Newtonsoft Json Error converting value {null} to type 'System.Int32'

When performing an AJAX request I am getting the following error: Error converting value {null} to type 'System. ... claimed to know actually). See Question&Answers more detail:os...

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

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615 views

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c# - parsing "*" - Quantifier {x,y} following nothing

fails when I try Regex.Replace() method. how can i fix it? Replace.Method (String, String, ... IgnoreCase | RegexOptions.Multiline)%> See Question&Answers more detail:os...

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

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611 views

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c# - asp.net custom validator not firing for textbox

I have both a required field validator and custom validator for validating a texbox. The required field validator fires ... .IsValid = false; } See Question&Answers more detail:os...

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

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472 views

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c# - nameof with Generics

I was experimenting with nameof with generics. I didn't get the result I was expecting. I'm not sure if ... Or is there some other limitation? See Question&Answers more detail:os...

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

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498 views

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c# - How to configure an Identity column using Entity Framework Core?

How do I create an Auto increment identity column in Entity Framework Core? Obviously I can do it using fluent API for EF6 for example. See Question&Answers more detail:os...

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

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1.1k views

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c# - RestSharp HttpBasicAuthentication - example

I have a WPF client using RestSharp and WEB API Service. I try to use HttpBasicAuthenticator as follows: RestRequest ... (and uses RestSharp). See Question&Answers more detail:os...

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

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532 views

1 answer

c# - How do I select all items in a listbox on checkbox checked?

I need to select all items in a ListBox when a CheckBox is clicked. Is it possible to select all items in the ... to true for each one of them? See Question&Answers more detail:os...

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

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698 views

1 answer

c# - How to use DATEADD over column in LINQ - DateAdd is not recognized by LINQ

I am trying to invalidate requests of friendship that were reponded less than 30 days ago. var requestIgnored ... recognize the command .AddDays See Question&Answers more detail:os...

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

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294 views

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c# - Enum inheriting from int

I've found this all over the place in this code: public enum Blah: int { blah = 0, blahblah = 1 } Why would ... from int? Does it ever need to? See Question&Answers more detail:os...

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

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387 views

1 answer

c# - OnCheckedChanged event not firing

I have a GridView with a column of checkboxes (the rest of the GridView is being populated from a database). I' ... :UpdatePanel> </div> </form> 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# - What changed in .net 5 that makes it not throw when changing dictionary values in foreach

In .NET<5 and .NET Core 3.1 the following code var d = new Dictionary<string, int> { { "a", 0 }, { ... it something to do with ref readonly T? See Question&Answers more detail:os...

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

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677 views

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c# - How to auto scroll down in WinForms ListView control when update new item?

How to auto scroll down in ListView control when update new item? I have tried listView1.Focus(); listView1.Items ... ; but this 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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