C#的动态编译执行

在运行时编写代码并编译执行。如下所示。

Open按钮打开任意文本文件，并载入到TextBox。载入后可更改。

Compile按钮进行编译和执行。具体代码如下。

using System;
 using System.Windows.Forms;
 using System.IO;
 using System.CodeDom.Compiler;
 using Microsoft.CSharp;
 using System.Reflection;

 namespace DynamicCodeCompiler
{
    public partial class Form1 : Form
    {
        string dynammicCode;

        public Form1()
        {
            InitializeComponent();
        }

        //打开文件并载入代码
        private void button1_Click(object sender, EventArgs e)
        {
            OpenFileDialog ofd = new OpenFileDialog();
            ofd.Multiselect = false;

            if (ofd.ShowDialog()==DialogResult.OK)
            {
                FileStream fs = new FileStream(ofd.FileName,FileMode.Open);
                StreamReader sr = new StreamReader(fs);
                dynammicCode = sr.ReadToEnd();
                textBox1.Text = dynammicCode;
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            if (textBox1.Text != null)
            {
                // 1.CSharpCodePrivoder
                CSharpCodeProvider objCSharpCodePrivoder = new CSharpCodeProvider();

                // 2.ICodeComplier
                ICodeCompiler objICodeCompiler = objCSharpCodePrivoder.CreateCompiler();

                // 3.CompilerParameters
                CompilerParameters objCompilerParameters = new CompilerParameters();

                //此处添加引用，使用的代码必须在此处有引用否则会编译错误
                objCompilerParameters.ReferencedAssemblies.Add("System.dll");
                objCompilerParameters.ReferencedAssemblies.Add("System.Windows.Forms.dll");
                objCompilerParameters.GenerateExecutable = false;
                objCompilerParameters.GenerateInMemory = true;

                // 4.CompilerResults
                CompilerResults cr = objICodeCompiler.CompileAssemblyFromSource(objCompilerParameters, textBox1.Text);

                if (cr.Errors.HasErrors)
                {
                    Console.WriteLine("编译错误：");
                    foreach (CompilerError err in cr.Errors)
                    {
                        Console.WriteLine(err.ErrorText);
                    }
                }
                else
                {
                    // 通过反射，调用HelloWorld的实例。此处命名空间和类硬编码为Test.Program。
                    Assembly objAssembly = cr.CompiledAssembly;
                    object objDynamicAssenmbly = objAssembly.CreateInstance("Test.Program");
                    MethodInfo objMI = objDynamicAssenmbly.GetType().GetMethod("Main");

                    //Console.WriteLine(objMI.Invoke(objDynamicAssenmbly, null));
                    objMI.Invoke(objDynamicAssenmbly, null);
                }

            }
        }
    }
}