Recent questions tagged C#

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c# - Unicode SQL Query W/ Parameter instead N Prefix

I have an insert query to execute from within a C# against a SQL Server database. The column I am inserting to ... ? like it says so here. 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# - Asynchronous Programming with Async and Await

I'm walking through this tutorial on how to program asynchronously in c# and have come across an error I'm not sure ... = ""; return results; } 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 can I modify a queue collection in a loop?

I have a scenario where I need to remove an item for the queue as soon as been processed. I understand I cannot remove ... Name { 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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c# - Why Does Await Not Appear to Prevent Second Operation on EF Context

Within an ASP.NET MVC Application I'm recieving the following error message for one of my controller methods ... .ToSelf().InRequestScope(); 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# - Why is List<T> not valid on an covariant interface MyInterface<out T>

Follow up question to a previous question, this has been identified as a co-variance issue. Taking this one ... can/should this be resolved? 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# - Listbox item WPF, different background color for different items

I have a WPF ListBox containing a binded list of items from a specific class that I have. Something like this: ... I'm following the right path. 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# - OracleBulkCopy Class in Oracle.ManagedDataAccess.dll?

I am using OracleBulkCopy Class with reference to Oracle.DataAccess.dll. I want to use Oracle. ... Oracle.ManagedDataAccess.dll? 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# - Why is 'box' instruction emitted for generic?

Here is fairly simple generic class. Generic parameter is constrained to be reference type. IRepository and DbSet also ... now it's clear. 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 Active Directory pwdLastSet to Date/Time

public static string GetProperty(SearchResult searchResult, string PropertyName) { if (searchResult.Properties.Contains( ... create a DateTime 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# - Visual Studio 2013 sp1 hangs when trying to debug ASP.NET web site?

Recently, Visual Studio 2013 started hanging again when trying to debug/trace an ASP.NET web site. The site was created ... I do to fix 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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c# - How can you store lists of objects in SQLite.net?

Let us assume I have these two objects class Customer { [PrimaryKey] public string id; [??????] public List ... for any help you can provide 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 create a WebSocket server using SuperWebSocket

I am creating an application which needs WebSocket Communication. All I need is a simple ... (this.WebSocketServer_SessionClosed); 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# - Combining Forms Authentication and Basic Authentication

I have some core ASP code that I want to expose both by secure web pages (using Forms Authentication) and via ... + 1); return credentials; } See Question&Answers more detail:os...

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

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841 views

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c# - How can I build Entity Framework queries dynamically?

I'm quite new to Entity Framework and I have a question about filtering data. I have two various Log entities, ... the way to make it better. See Question&Answers more detail:os...

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

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964 views

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c# - Get the surface area of a polyhedron (3D object)

I have a 3D surface, (think about the xy plane). The plane can be slanted. (think about a slope road). ... find the area of that 3D surface? 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 bind to element from collection/list in Blazor?

I want to bind values to elements from my list in a loop but I cannot find the good solution. <EditForm Model=" ... ="effect" /> </p> } 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# - Using SendInput to send unicode characters beyond U+FFFF

I'm writing an onscreen keyboard similar to the one in Windows 8. I have no problem sending most of the characters I ... such as ?? (U+1F600)? See Question&Answers more detail:os...

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

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994 views

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c# - Deserialization error: value cannot be null. Parameter name: type

I'm trying to deserialize a json response and am getting the value cannot be null error. Any help is ... .Deserialize(String input) +70 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# - "There is no editor available for" Can't open .cs

My computer shut down while working on a project and when I opened C# again and recovered it, I got an error ... any way to recover the 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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c# - How to get DisplayAttribute of a property by Reflection?

I have a Helper method like this to get me the PropertyName (trying to avoid magic strings) public static ... eproperty instead? Many 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# - Nested Parallel.For() loops speed and performance

I have a nested for loop. I have replaced the first For with a Parallel.For() and the speed of ... it changes the performance and speed. 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# - LINQ - Add property to results

Is there a way to add a property to the objects of a Linq query result other than the following? var ... and I appreciate your suggestions. See Question&Answers more detail:os...

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

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967 views

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c# - UOW - A second operation started on this context before a previous asynchronous operation completed

I am trying following code, it has two parts, one is navigation via prism. When navigation is allowed I am ... code to reduce the code size) 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# - Counter of type RateOfCountsPerSecond32 always shows 0

I have a windows service that serves messages of some virtual queue via a WCF service interface. I wanted to expose ... fine. What am I missing? 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 Contains thread safe in HashSet<T>

Looking at the code for Contains in the HashSet<T> class in the .NET source code, I cannot find any ... don't actually require storing values. 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 global.asax Application_Error event not fired if custom errors are turned on?

If you have custom errors set to RemoteOnly in web config - does this mean that MVC's application level error event ... application", true); } } See Question&Answers more detail:os...

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

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957 views

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c# - Json.NET MissingMemberHandling setting

I would like Json.NET to throw a JsonSerializationException when the Json string is missing a property that the C# ... is the case. 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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857 views

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c# - Can a Generic Method handle both Reference and Nullable Value types?

I have a series of Extension methods to help with null-checking on IDataRecord objects, which I'm currently ... I implement this 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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