LiteDB: Invalid BSON data type 'Null' on field '_id'

Using [LiteDB](http://litedb.org), and it is amazing. It works well for loading and storing data, however, not on subsequent loads after the database has been created. On initial load, everything is ...

13 Jul at 01:2

How do I pass a RefId to the UserAuthDetail table in Servicestack?

I see that servicestack supports passing an int? RefId and string RefString in both the Userauth table and the UserAuthDetail table. I have hooked up my sign-up/sign-in process to facebook, but when i...

13 Jul at 00:57

Library NuGet configuration is invalid

VS2015 Update 3. I created a plain .net core class library. Right-click on Project->References-> Manage Nuget packages throws the following error? What is missing? [](https://i.stack.imgur.com/ELVX...

Single letter words in camelCase, what is a standard for handling these?

I'm trying to group together an object's vertex X components in a vector, like structure of array style. Naturally this is the way. ``` Vec xComponents; or Vec xVals; or simply Vec x; ``` However...

12 Jul at 23:39

How to decode JWT Token?

I don't understand how this library works. Could you help me please ? Here is my simple code : ``` public void TestJwtSecurityTokenHandler() { var stream = "eyJhbGciOiJSUzI1N...

NSubstitute - mock throwing an exception in method returning Task

Using [NSubstitute](http://nsubstitute.github.io), how do you mock an exception being thrown in a method returning a Task? Let's say our method signature looks something like this: ``` Task<List<obj...

Conflict between System.IdentityModel.Tokens and Microsoft.IdentityModel.Tokens

I have a conflict when using System.IdentityModel.Tokens : ``` using System; using System.Configuration; using System.Data; using System.Data.SqlClient; using System.IdentityModel.Tokens; using System...

20 Jun at 09:12

'No database provider has been configured for this DbContext' on SignInManager.PasswordSignInAsync

> .Net Core 1.0.0 - SDK Preview 2 (x64).Net Core 1.0.0 - VS "15" Preview 2 (x64).Net Core 1.0.0 - Runtime (x64) So, we updated an RC1 app to the latest versions above. After many hours of switching re...

Where can I find a list of all available ChromeOption arguments?

I am a big advocate for reading the manual. But in this case, despite searching online for some time I cannot find a manual explaining all of the available `ChromeOptions` arguments. Somewhere there m...

23 Jan at 10:8

Why specify route parameter type in web api?

I have a web api end point with a route parameter. It works with or without the route parameter type. I just would like to know why specify this in the following code? ``` [HttpGet] [Route("{myId:int...

12 Jul at 16:29

Converting object to datetime format in python

Below is the first row of my csv DateTime column: ``` Mon Nov 02 20:37:10 GMT+00:00 2015 ``` The DateTime column is currently an object and I want to convert it to datetime format so that I can get t...

17 Apr at 02:32

How to use Rijndael encryption with a .Net Core class library? (Not .Net Framework)

How do we use Rijndael encryption in a .Net Core class library? (Not a .Net Framework Class Library) We need to create a shared .Net Core library for use in multiple projects and need to implement En...

How do I access store state in React Redux?

I am just making a simple app to learn async with redux. I have gotten everything working, now I just want to display the actual state onto the web-page. Now, how do I actually access the store's stat...

What would the Big O be of a nested for loop with an Any() inside it?

This questions is basically a follow-on from my [answer here](https://stackoverflow.com/a/38332524/542251). I really wanted to say what the Big-O of this algorithm would be, but I wasn't sure my claim...

23 May at 12:33

ASP.NET Core - Create custom model validation

In previous versions of ASP.NET MVC the way to add custom validation to your model was by implementing the `IValidatableObject` and implementing your own `Validate()` method. Here's what I have implem...

How to use Data Annotations to validate a nullable int

In an MVC 5 project, I have a model with a nullable int. For reasons that might not be productive to explain, it needs to be an nullable int and cannot be a string. ``` // Value can be null or an int...

12 Jul at 14:44

Type.IsEnum Property in Portable Class Library

I'm trying to code in a `Portable Class Library` using `ASP.NET Core 1.0`, the following instruction: ``` public static void WriteMessage<T>(T value) { if (typeof(T).IsEnum) { Debug....

12 Jul at 11:52

C# emulate HID clicker bluetooth

I need some guidance on how or whether this is possible to achieve without a "server" application running on the pc. I have gotten as far as establishing a bluetooth connection to the PC, I would like...

7 Jan at 02:16

Why click tree throws 'System.Windows.Documents.Run' is not a Visual or Visual3D' InvalidOperationException?

Sometimes right-clicking treeviewitem results unhandled InvalidOperationException. In code behind I select the right clicked row: ``` static TreeViewItem VisualUpwardSearch(DependencyObject source) ...

12 Jul at 09:39

error TS2339: Property 'x' does not exist on type 'Y'

I don't understand why this code generates a TypeScript error. (It's not the original code and is a bit derived, so please ignore the non-sense in the example): ``` interface Images { [key:string]: ...

9 Feb at 19:59

How to add claims in a mock ClaimsPrincipal

I am trying to unit test my controller code which gets the information from the ClaimsPrincipal.Current. In the controller code I ``` public class HomeController { public ActionResult GetName() ...

12 Jul at 08:41

Error: EACCES: permission denied

I run but it throws error. I know it is permission issue but as far as I know, sudo permission is not required for installing node module locally. If I run it with sudo, it gets installed inside ~/n...

12 Jul at 08:50

Which members of .NET's ConcurrentDictionary are thread-safe?

The MSDN documentation of [System.Collections.Concurrent.ConcurrentDictionary](https://msdn.microsoft.com/en-us/library/dd287191(v=vs.110).aspx) says: > # Thread Safety All public and protected mem...

Why can't I put [assembly:Dependency()] above a class?

I'm trying to implement some platform-specific code in Xamarin, using [this answer](https://stackoverflow.com/questions/28688133/how-to-call-platform-specific-page-from-xamarin-forms), but I ran into ...

23 May at 11:46

How to I set the Connection : Keep-Alive header to Close in the JsonServiceClient?

On occasion (not consistently), I'm receiving a "" exception thrown by an instance of the JsonServiceClient. I want to set the Http Connection Header to Close. When I attempt "" exception.

12 Jul at 01:28