How do I get the Reflection TypeInfo of a C# 9 program that use Top-level statements?

问题

Assume I have a simple script writing in C# 9 like this:

using System;
using System.IO;

// What to put in the ???
var exeFolder = Path.GetDirectoryName(typeof(???).Assembly.Location);

Before, with the full program, we can use the Main class as an "indicator" class. this and this.GetType() is not available because technically it's inside a static method. How do I get it now?

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A workaround I thought of while typing the question is Assembly.GetCallingAssembly():

var exeFolder = Path.GetDirectoryName(Assembly.GetCallingAssembly().Location);

It works for my case, but I can only get the Assembly, not the TypeInfo that in which the code is running.

回答1:

I suggest starting from the method which is executing (Main):

TypeInfo result = MethodBase
  .GetCurrentMethod() // Executing method         (e.g. Main)
  .DeclaringType      // Type where it's declared (e.g. Program)
  .GetTypeInfo();    

If you want Type, not TypeInfo drop the last method:

Type result = MethodBase
  .GetCurrentMethod() // Executing method         (e.g. Main)
  .DeclaringType;     // Type where it's declared (e.g. Program)

 

回答2:

You can also get the assembly using GetEntryAssembly.

Once you have the assembly that your code is in, you can get its EntryPoint, which is the compiler-generated "Main" method. You can then do DeclaringType to get the Type:

Console.WriteLine(Assembly.GetEntryAssembly().EntryPoint.DeclaringType);

The above should get the compiler-generated "Program" class even if you are not at the top level.

来源：https://stackoverflow.com/questions/65164165/how-do-i-get-the-reflection-typeinfo-of-a-c-sharp-9-program-that-use-top-level-s