Loading a script from a cs file and accessing host methods, properties etc?

问题

I'm just having a play with Roslyn but unsure on how to do the following.

To keep this simple, lets say I have a host program which has a method like so

public void DisplayMessage(string message)
{
   MessageBox.Show(message);
}

Can I then have a script file called MyScript.csx and then somewhere in the script have something like

void Main()
{
   Host.DisplayMessage("I am a script");
}

Then I have the host load the file and execute it.

If this sort of thing can't be done, is there a scripting system/engine based on c# that can do it? These are the requirements

Host application can load script from a file.
Script file is written in c# and so can be written using VS2010 with syntax etc
Script file can access host public methods, properties etc

回答1:

Yes, you can do what you want using Roslyn.

First, create a public Host class that has a public DisplayMessage method (or use a existing class). Then create ScriptEngine, specifying the assembly that contains Host as a reference. After that, you can call ExecuteFile() on your file, with the Host object as another parameter:

var engine = new ScriptEngine(references: new[] { typeof(Host).Assembly });
engine.ExecuteFile("MyScript.csx", new Host());

The script files doesn't need any Main() method, and you call the method on the host object directly:

DisplayMessage("I am a script");

回答2:

I wrote an Introduction to the Roslyn scripting API that covers most of what you're asking. The ScriptEngine type also has a ExecuteFile method that would be useful for what you're trying to do.

Disclaimer: I work for Microsoft on the Roslyn project.

来源：https://stackoverflow.com/questions/9939433/loading-a-script-from-a-cs-file-and-accessing-host-methods-properties-etc

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roslyn