IAsyncEnumerable not working in C# 8.0 preview

I was playing around with C# 8.0 preview and can't get `IAsyncEnumerable` to work. I tried the following ``` public static async IAsyncEnumerable<int> Get() { for(int i=0; i<10; i++) { ...

6 Dec at 13:8

Pandas Merging 101

- `INNER``LEFT``RIGHT``FULL``OUTER``JOIN`- - - - - - `merge``join``concat``update` ... and more. I've seen these recurring questions asking about various facets of the pandas merge functionality. Most...

31 Jul at 17:38

Converting SQL to LINQ to hit database once

How can I convert the following T-SQL query to LINQ? ``` SELECT * FROM "VwBusinessUnits" WHERE "BusinessUnitName" in ( SELECT DISTINCT TOP 10 "BusinessUnitName" ...

11 Dec at 02:35

Use Visual Studio 2017 with .Net Core SDK 3.0

How Can I open `.Net Core 3.0` project in Visual Studio 2017? I have downloaded the .NET Core 3.0 SDK from [dotnet.microsoft.com](https://dotnet.microsoft.com/download) and created new project with `...

Install .NET Framework 4.7.2 (if needed) with WIX installer

Help! I've inherited a .NET project with a WIX installer project. They make the implicit assumption that .NET Framework 4.5 is installed on each machine which for the most part is true. Now we are a...

5 Dec at 20:30

What is limiting the port range for HTTPS in .NET Core 2.2?

In the I have the following. It works and I can access Swagger and the rest of the page using [https://localhost:44300](https://localhost:44300). ``` { ... "iisSettings": { "windowsAuthenticat...

Could not load file or assembly When Net Framework reference a Net Standard Library

I am very new to netstandard and I just encountered exception when I want to run a debug mode a .Net Framework (console) which has reference to a netstandard library. [](https://i.stack.imgur.com/tNJ...

5 Dec at 17:43

Re-enable title bar in Visual Studio 2019

I've downloaded the preview version of Visual Studio 2019 and the title bar is disabled by default. This doesn't work for me as I currently develop C# applications using multiple instances of visual ...

How to enable Nullable Reference Types feature of C# 8.0 for the whole project

According to the [C# 8 announcement video](https://youtu.be/VdC0aoa7ung?t=137) the "nullable reference types" feature can be enabled for the whole project. But how to enable it for the project? I did...

InvalidOperationException on File return

am running into some weird issue when i try to return a file to be downloaded, so this is my code ``` string filePath = Path.Combine(Path1, Path2, filename); return File(filePath, "audio/mp3", "myf...

How to create a custom Authorize attribute for multiple policies in ASP.NET CORE

I want to authorize an action controller could access by multiple policies. .e.g: ``` [Authorize([Policies.ManageAllCalculationPolicy,Policies.ManageAllPriceListPolicy]] public async Task<IActionRe...

Mocking OrmLiteReadApi Extension Methods

I am trying to mock the `ServiceStack.OrmLite.OrmLiteReadApi.Select()` extension method. I'm using Moq in conjunction with [Smocks](https://github.com/vanderkleij/Smocks) so I can mock extension meth...

ASP.NET Core 2.1 - Error Implementing MemoryCache

I was following the steps given [here](https://learn.microsoft.com/en-us/aspnet/core/performance/caching/memory?view=aspnetcore-2.2#using-imemorycache) to implement a `MemoryCache` in `ASP.NET Core` a...

5 Dec at 04:25

How do I display a single image in PyTorch?

How do I display a PyTorch `Tensor` of shape `(3, 224, 224)` representing a 224x224 RGB image? Using `plt.imshow(image)` gives the error: > TypeError: Invalid dimensions for image data

16 Jul at 23:21

.NET Core Exception: A circular dependency was detected for the service of type

Recently I asked a question about software architecture [Should service call another service or repository directly?](https://stackoverflow.com/questions/53564865/should-service-call-another-service-...

how to access Configuration in a IWebHostBuilder extension

As the topic says, I can't figure out how to access the Configuration object set up in CreateWebHostBuilder. `Code`: ``` public static IWebHostBuilder CreateWebHostBuilder(string[] args) => WebH...

4 Dec at 20:9

How do I mock Directory.GetFiles?

I am trying to figure out how or if it is possible to do the following with Moq ``` public class Download { private IFoo ifoo; public Download(IFoo ifoo) { this.ifoo = ifoo; ...

11 Apr at 22:33

How to Run C# ASP.NET Core 2.1 and Node.js with Different Ports in Nginx?

So I've installed Nginx, Node.js and C# ASP.NET Core 2.1 on my virtual server (virtualbox) and currently running on each separate port. Node.js running on localhost:3000. .NET Core running on localh...

Manually creating an HttpContext in ASP.NET Core 2.x

I'm trying to render a Razor view to a string from a Hosted Service. By using the `IRazorViewEngine` I am able to render a view to a string using something like the following: ``` _viewEngine.FindVie...

JSON Configuration in full .NET Framework Console App

I have a Console App targeting .NET 4.7.1. I'm trying to use .net core like configuration in my .Net Framework app. My `App.config is: ``` <configuration> <configSections> <section name="config...

Logging Polly wait and retry policy ASP.NET CORE

I need to log retry policy defined via Polly in APS.NET CORE My code is below showing Polly retry polly and using HttpClient. I wonder if there is a better way than what is on [stevejgordon][1]. [1]:...

Switch based on generic argument type

In C# 7.1 the below is valid code: ``` object o = new object(); switch (o) { case CustomerRequestBase c: //do something break; } ``` However, I want to use the pattern switch st...

"Client network socket disconnected before secure TLS connection was established", node 10

When I send request to google api (using either axios or just https), e.g. `https://www.googleapis.com/blogger/v3/blogs/2399953?key=...` I always hit the "" error. But if I send request to [https://ap...

27 Nov at 03:26

ServiceStack Service Gateway throws AggregateException instead of WebServiceException

I'm switching to using ServiceGateway to execute requests from within my ASP.net controller. Whereas before I could just wrap the call in a Try Catch block with catch (WebServiceException ex), now the...

3 Dec at 09:54

How can I do a self join in ORMLite

I'm trying to get all time entries for a specific foreman based on his supervisor's supervisor. However, I seem to be having trouble writing a self join query in ORMLite. See my data structure and c...

3 Dec at 07:33