Recent questions tagged C#

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c# - How to delete a record with a foreign key constraint?

Started a new ASP.NET MVC 3 application and getting the following error: The primary key value cannot be deleted because ... { 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# - Change App language at RunTime on-the-fly

I'm currently developing a metro app in which the user can change current language at runtime and all the ... runtime without restarting my app? See Question&Answers more detail:os...

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

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431 views

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c# - Response.TransmitFile and delete it after transmission

I have to implement GEDCOM export in my site. My .net code created one file at server when export to gedcom ... transmitted and I get an 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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c# - EF Code First cascade delete and update?

My entities are these: public class Customer { public Customer() { Invoices = new List<Invoice>(); Payments = ... me in these issues. thanx. 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 prevent an out-parameter to end up return parameter in a WCF web service?

If my contract looks as follows: [OperationContract] void DoSomething(int id, out string moreInfo); this ends up ... is this a SOAP 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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338 views

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c# - How can I determine if one rectangle is completely contained within another?

I have a theoretical grid of overlapping rectangles that might look something like this: But all I have to work ... the parent's first child. 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# - Pass current transaction to DbCommand

I'm working on a project using ASP.NET Core 2.1 and EF Core 2.1. Although most of queries and commands use ... for this? Thank you so much. 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# - are ranges possible with enums?

In C#, can you use number ranges in enum types, for example public enum BookType { Novel = 1, Journal = 2, ... output is: Book 5 is a TextBook 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 Entity Framework add many related entities with single SaveChanges()?

I am writing many (20+) parent child datasets to the database, and EF is requiring me to savechanges between each ... the end of the big loop. 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# - Deploying NetFwTypeLib to manage the Windows Firewall

My Windows service needs to create/remove certain rules from the Windows firewall. For this I interface with NetFwTypeLib ... a fix for 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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578 views

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c# - Thread safety with Dictionary<int,int> in .Net

I have this function: static Dictionary<int, int> KeyValueDictionary = new Dictionary<int, int>(); static void ... is thread safe then 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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c# - How to get notified before static variables are finalized

When can i cleanup objects stored in static variables in C#? I have a static variable that is lazily initialized: ... i cannot make it work. See Question&Answers more detail:os...

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

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552 views

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c# - Trying to set the decimal separator for the current language, getting "Instance is read Only"

I have code that was originally written for an English language market where the decimal separator is "." so ... other than its default? See Question&Answers more detail:os...

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

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323 views

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c# - Getting previous value of the ComboBox

I want my application to grab the value of a ComboBox and then to set the one chosen by the user or to ... selected item from other/same list. 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 does Unity execute its methods?

I only have a small experience in Unity3D, but I noticed that classes that derive from MonoBehaviour may ... reflection magic happening there? See Question&Answers more detail:os...

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

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438 views

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c# - EF. The connection was not closed. The connection's current state is connecting

I have jwt auth: var messageHandlers = new JwtMessageHandler(_serviceProvider); app.UseJwtBearerAuthentication(new ... this case? See Question&Answers more detail:os...

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

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452 views

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c# - Entity Framework - How to get relative file path in seed method

Why is filePath null? Any ideas on how to get the relative filePath? internal sealed class Configuration : ... help will be appreciated. See Question&Answers more detail:os...

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

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609 views

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c# - XmlSerializer with new enum values

We use xml serialization / deserialization extensively in our project to pass data between multiple application. We ... Any other 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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c# - ORA-12557 TNS:protocol adapter not loadable

I am trying to develop a C# Windows Forms Application targeting the .net 4 framework. The program will execute ... help it would be appreciated. See Question&Answers more detail:os...

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

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401 views

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c# - No such host is known socket connection

I'm trying to work with this library for telnet connections. I have called the function correctly and it ... any help would be appreciated. See Question&Answers more detail:os...

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

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390 views

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c# - Why does this Using() give me an error?

I am trying to open an (hundreds actually) excel file(s). I open the application but want to use the Using() ... '. How to make this work? See Question&Answers more detail:os...

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

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529 views

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c# - Is the method naming for property getters/setters standardized in IL?

I have the following two methods that I am wondering if they are appropriate: public bool IsGetter(MethodInfo ... a property getter/setter? See Question&Answers more detail:os...

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

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503 views

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c# - 'The database file is locked' with System.Data.SQLite

I am suddenly getting the following errors from SQLite after adding a new transaction: The database file is locked ... about this one... See Question&Answers more detail:os...

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

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631 views

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c# - Understanding the null coalescing operator (??)

I have a custom WebControl which implements a .Value getter/setter returning a Nullable<decimal> It's a ... - some screengrabs from VS2010 See Question&Answers more detail:os...

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

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231 views

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c# - Windows Phone 8.1 Pivot custom header style

I'm aiming to mimic similar effect as seen here: http://www.visuallylocated.com/post/2012/05/23/Changing-the- ... Or maybe there is another 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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281 views

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c# - Get Data Annotations attributes from model

I want to create custom client-side validator, but I want define validation rules via Data Annotations attributes at ... how to use 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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322 views

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c# - Construct url in view for Web Api with attribute routing

How can I get the url from web api in my view? Example (from the msdn-blog): [RoutePrefix("reviews")] public ... it to redirect to /reviews/... See Question&Answers more detail:os...

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

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390 views

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c# - Can we have multiple App.Config files in .NET console application?

I have a console application that has App.Confile file. Now the parameters that are environment specific are ... Appreciate your help. 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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