How Can I Dynamically Execute C# Code from a File in a WPF Application?

Dynamic execution of C# code files

Question:

Your WPF C# application comes with a button that needs to execute code stored in a separate text file in the application's runtime directory.

Solution:

To dynamically execute code in a text file, follow these steps:

1. Compile code: Use a C# compiler (such as CSharpCodeProvider) to compile the code in the text file into an assembly.
2. Create an instance of a compiled assembly: Use the CreateInstance() method of the System.Reflection.Assembly class to create an instance of a compiled assembly.
3. Invoking a method: Use the GetMethod() and Invoke() methods of the System.Reflection.Type class to invoke the desired method on the instance.

Here is sample code on how to execute a dynamically compiled class method:

using System;
using System.Collections.Generic;
using System.Text;
using System.Diagnostics;
using System.IO;
using System.Reflection;
using System.Net;
using Microsoft.CSharp;
using System.CodeDom.Compiler;

namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {
            string source =
            @"
namespace Foo
{
    public class Bar
    {
        public void SayHello()
        {
            System.Console.WriteLine(""Hello World"");
        }
    }
}
            ";

            Dictionary<string, string> providerOptions = new Dictionary<string, string>
                {
                    {"CompilerVersion", "v3.5"}
                };
            CSharpCodeProvider provider = new CSharpCodeProvider(providerOptions);

            CompilerParameters compilerParams = new CompilerParameters
                {GenerateInMemory = true,
                 GenerateExecutable = false};

            CompilerResults results = provider.CompileAssemblyFromSource(compilerParams, source);

            if (results.Errors.Count != 0)
                throw new Exception("编译失败！");

            object o = results.CompiledAssembly.CreateInstance("Foo.Bar");
            MethodInfo mi = o.GetType().GetMethod("SayHello");
            mi.Invoke(o, null);
        }
    }
}

Following these steps, you can dynamically execute C# code from a code file in a WPF application.

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