A second operation started on this context before a previous asynchronous operation completed

``` "System.NotSupportedException was unhandled Message: An unhandled exception of type 'System.NotSupportedException' occurred in mscorlib.dll Additional information: A second operation started on ...

EntityFramework Core relation to composite key

Consider the following database tables. Unfortunately the tables cannot be altered in any way. [](https://i.stack.imgur.com/TtW1q.png) `Houses` has an auto-increment ID field named `Id`, a string fi...

FindAsync and Include LINQ statements

The code I have got so far works fine ``` public async Task<ActionResult> Details(Guid? id) { if (id == null) { return new HttpStatusCodeResult(HttpStatusCode.BadRequest); } I...

26 Apr at 10:20

EF DBContext dispose not closing the connection

I am using the EF 6.1.0 I have below custom DBContex object as DBEntites ``` public partial class DbEntities : DbContext { public DbEntities() : base("name=DbEntities") { //...

1 Nov at 12:14

C# async / await method to F#?

I am trying to learn F# and am in the process of converting some C# code to F#. I have the following C# method: ``` public async Task<Foo> GetFooAsync(byte[] content) { using (var stream = new M...

1 Nov at 12:24

how to unit test service stack and visual studio

I create a service stack mvc template that include 4 project using visual studio 2013 - Web application - .ServiceInterface -.ServiceModel =.Tests I am trying to write unit test ,but when i click...

31 Oct at 21:10

Specify max length attribute to match varchar(max)

I have a model like so: ``` public int Id { get; set; } [Required] [StringLength(50, MinimumLength = 3)] public string Title { get; set; } [Required] [StringLength(50, MinimumLength = 3)] public st...

31 Oct at 20:44

Pinch, and other multi-finger gestures, in modern Unity3D?

In modern Unity3D, we use the IPointerDownHandler family of calls. Regarding the `IPointerDownHandler` family of calls, ``` public class FingerMove:MonoBehaviour, IPointerDownHandler... { publ...

20 Jun at 09:12

How to redirect www to non www rule in AspNetCore 1.1 preview 1 with RewriteMiddleware?

Using the AspNetCore 1.1 bits and the new [RewriteMiddleware](https://github.com/aspnet/BasicMiddleware/tree/dev/src/Microsoft.AspNetCore.Rewrite) I wrote something like this into the `Startup.cs` to ...

30 Oct at 23:2

Automatically generate lowercase dashed routes in ASP.NET Core

ASP.NET Core uses CamelCase-Routes like [http://localhost:5000/DashboardSettings/Index](http://localhost:5000/DashboardSettings/Index) by default. But I want to use lowercase routes, which are delimit...

Instantiating objects with .NET Core's DI container

I'm using an `IServiceCollection` to create a list of required services for my objects. Now I want to instantiate an object and have the DI container resolve the dependencies for that object ``` //...

30 Oct at 23:16

How to change font color from C# in WPF

I have created a simple Calendar application and I would like to change the color of names of the days that are displayed. I created a simple condition: ``` if (nameDay.Text.Equals("Sunday")) { d...

30 Oct at 20:42

Calling async methods from non-async code

I'm in the process of updating a library that has an API surface that was built in .NET 3.5. As a result, all methods are synchronous. I can't change the API (i.e., convert return values to Task) beca...

In Visual Studio, is there a way to sort private methods by usage?

In Visual Studio, with or without an extension, is there a way to automatically sort private methods inside a class based on the order of their usage (their location in the call stack)? For example c...

5 Nov at 21:50

Using Unity3D's IPointerDownHandler approach, but with "the whole screen"

In Unity say you need to detect finger touch (finger drawing) on something in the scene. The only way to do this : --- . Put a collider on that object. ("The ground" or whatever it may be.) O...

10 Apr at 14:49

What is the benefit of using "Expression Bodied Functions and Properties"

I do have seen many using that , but what is the benefit of using those expressions? ## Examples: ``` public override string ToString() => string.Format("{0}, {1}", First, Second); public string...

23 May at 12:33

Cannot find .cs files for debugging .NET source code

I tried setting up debugging the .NET source by following this [MDSN walkthrough](https://msdn.microsoft.com/en-us/library/cc667410.aspx). The Symbol cache is setup properly, as is the check 'Enable ....

18 Aug at 13:32

Is there an open source equivalent of ServiceStack AutoQuery for asp.net core?

I would like to know if there is an open source equivalent of AutoQuery From ServiceStack for `asp.net` core (or `asp.net`) which can automatic query with the orm i use: ef core (or other) with uris l...

Writing Unit Tests in Visual Studio Code

I am new to using the Visual Studio Code in place of visual studios and i feel a little lost to how i can set up my program to include unit test. I created a c# console app and i would like to creat...

29 Oct at 08:24

Failed to start redis.service: Unit redis-server.service is masked

I Installed Redis Server on ubuntu 16.04. but when I try to start the redis service using ``` $ sudo systemctl start redis ``` I receive message: ``` Failed to start redis.service: Unit redis-server...

IRedisClient GetTypedClient not found

I get error IRedisClient does not contain definition of GetTypedClient: ``` private readonly IRedisClient _redisClient; public CustomerRepository(IRedisClient redisClient) { _redisC...

28 Oct at 23:49

EF Core: ValueGeneratedNever() vs. not using this method at all

What is the point of explicitly telling entity framework not to generate a value for a field in a database? There are two other options which are `ValueGeneratedOnAdd` or `ValueGeneratedOnAddOrUpdate`...

Implement dependency injection outside of Startup.cs

I want to implement in . I know everything is about DI in .Net Core. For example ``` public void ConfigureServices(IServiceCollection services) { // Add application services. services....

Find method in current file/class in VS2015/C#

I can use the `Ctrl+,` shortcut to search for methods but will search among the entire project: [](https://i.stack.imgur.com/cVgi4.png) This lists all the classes in all files that have this method,...

Authorize By Group in Azure Active Directory B2C

I am trying to figure out how to authorize using groups in Azure Active Directory B2C. I can Authorize via User, for example: ``` [Authorize(Users="Bill")] ``` However, this is not very effective a...

24 Jan at 21:13