C#代码执行者-优快云博客

本文介绍了一种在C#中动态生成和执行代码的方法。通过使用CodeDom来编译和运行临时编写的C#代码片段，实现了在运行时动态创建功能。此外，还提供了一个示例，展示了如何在不修改现有应用程序的情况下增加新的行为。

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动态生成代码程序收集NO1：

using System;
using System.Collections.Generic;
using System.Reflection;
using System.Text;
using System.CodeDom;
using System.CodeDom.Compiler;

namespace csrepl
{
class Program
{
static string funcprefix = "using System; "
+ "public delegate void Proc(); "
+ "public class Wrapper { "
+ " public static object Set(string name, object value) { "
+ " AppDomain.CurrentDomain.SetData(name, value); "
+ " return value; "
+ " } "
+ " public static object Get(string name) { "
+ " return AppDomain.CurrentDomain.GetData(name); "
+ " } "
+ " public static object Invoke(Proc proc) { "
+ " proc(); "
+ " return null; "
+ " } "
+ " public static object Eval() { return ";
static string funcsuffix = "; } }";

static string StringEval(string expr)
{
string program = funcprefix + expr + funcsuffix;

ICodeCompiler compiler = CodeDomProvider.CreateProvider("C#").CreateCompiler();
CompilerParameters cp = new CompilerParameters();
cp.GenerateExecutable = false;
cp.GenerateInMemory = true;

CompilerResults results = compiler.CompileAssemblyFromSource(cp, program);
if (results.Errors.HasErrors)
{
if (results.Errors[0].ErrorNumber == "CS0029")
return StringEval("Invoke(delegate { " + expr + "; })");
return results.Errors[0].ErrorText;
}
else
{
Assembly assm = results.CompiledAssembly;
Type target = assm.GetType("Wrapper");
MethodInfo method = target.GetMethod("Eval");
object result = method.Invoke(null, null);
return result == null ? null : result.ToString();
}
}

static void Main(string[] args)
{
while (true)
{
Console.Write("> ");
Console.Out.Flush();
string expr = Console.ReadLine();
if (expr == null)
break;
try
{
string result = StringEval(expr);
Console.WriteLine(result);
}
catch (TargetInvocationException ex)
{
Console.WriteLine(ex.InnerException.GetType().Name + ": " + ex.InnerException.Message);
}
catch (Exception ex)
{
Console.WriteLine(ex.GetType().Name + ": " + ex.Message);
}
}

}
}
}

代码2：

private void Compiler(string code)
{
CompilerParameters vCompilerParameters = new CompilerParameters();
vCompilerParameters.GenerateExecutable = false;
vCompilerParameters.GenerateInMemory = true;
vCompilerParameters.ReferencedAssemblies.Add("System.Windows.Forms.dll");
string vSource =
"using System.Windows.Forms;/n" +
"public class Temp/n" +
"{/n" +
" public void Test()/n" +
" {/n" +
" " + code + "/n" +
" }/n" +
"}/n";
CompilerResults vCompilerResults =
CodeDomProvider.CreateProvider("CSharp").CompileAssemblyFromSource(vCompilerParameters, vSource);

Assembly vAssembly = vCompilerResults.CompiledAssembly;
object vTemp = vAssembly.CreateInstance("Temp");
MethodInfo vTest = vTemp.GetType().GetMethod("Test");
vTest.Invoke(vTemp, null);
}

string code = "int sum = 0;/nfor(int i = 0; i < 100; i++)/n{/nsum += i;/n}/nMessageBox.Show(sum.ToString());";
Compiler(code);

代码执行者1.0

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