C# – A project with an Output type of Class Library cannot be started directly

I've download sample code with C#. but when I run I get this error message:

A project with an Output type of Class Library cannot be started
directly In order to debug this project, add an executable project to
this solution which references the library project. Set the executable
project as the startup project.

Please give me a solution.

Best Answer

The currently selected startup project is a Class Library.

You need an entry point for your application. Does your solution contain multiple projects?

Are you sure you want to 'run' the Class Library?

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Possibly you've downloaded a Class Library solution only. In that case there might be unit tests that you can 'debug' to step-trough the code.

Update In response to your comment, these are possibilities to run the class library:

Create a console application and reference the class library. Then 'use' its contents
Debug an unit-test project
start existing client project

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C# – Create Generic method constraining T to an Enum

Since Enum Type implements IConvertible interface, a better implementation should be something like this:

public T GetEnumFromString<T>(string value) where T : struct, IConvertible
{
   if (!typeof(T).IsEnum) 
   {
      throw new ArgumentException("T must be an enumerated type");
   }

   //...
}

This will still permit passing of value types implementing IConvertible. The chances are rare though.

C# – framework give me error about cannot started directly

You get this error because the project for the class library is chosen as the startup project in Visual Studio. Right-click your web project and choose "Set as StartUp project".

Best Answer

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C# – Create Generic method constraining T to an Enum

C# – framework give me error about cannot started directly

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