通过微软提供的CSharpCodeProvider,CompilerParameters,CompilerResults等类,可以在运行时,动态执行自己写的代码文件。原理就是把你的代码文件动态编译成exe或dll,或者在内存中输出,然后通过Assembly进行反射,执行其中的方法或访问其中的属性等。
界面有两个按钮,一个执行ShowMessage方法,另一个执行ShowForm方法,代码如下:
需引入
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using Microsoft.CSharp;
using System.CodeDom;
using System.CodeDom.Compiler;
using System.Reflection;
namespace CodeTest
{
public partial class Test : Form
{
public Test()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
CSharpCodeProvider objCSharpCodePrivoder = new CSharpCodeProvider();
CompilerParameters objCompilerParameters = new CompilerParameters();
objCompilerParameters.ReferencedAssemblies.Add("System.dll");
objCompilerParameters.ReferencedAssemblies.Add("System.Windows.Forms.dll");
objCompilerParameters.GenerateExecutable = false;
objCompilerParameters.GenerateInMemory = true;
CompilerResults cresult = objCSharpCodePrivoder.CompileAssemblyFromSource(objCompilerParameters, textBox1.Text);
if (cresult.Errors.HasErrors)
{
foreach (CompilerError err in cresult.Errors)
{
MessageBox.Show(err.ErrorText);
}
}
else
{
// 通过反射,执行代码
Assembly objAssembly = cresult.CompiledAssembly;
object obj = objAssembly.CreateInstance("CodeTest.Test");
MethodInfo objMI = obj.GetType().GetMethod("ShowMessage");
objMI.Invoke(obj, new object[] { "This is CodeTest!" });
}
}
private void Form1_Load(object sender, EventArgs e)
{
textBox1.Text = "using System;" + Environment.NewLine +
"using System.Windows.Forms;" + Environment.NewLine +
Environment.NewLine +
"namespace CodeTest" + Environment.NewLine +
"{" + Environment.NewLine +
" public partial class Test" + Environment.NewLine +
" {" + Environment.NewLine +
'\t' + "public void ShowMessage(string msg)" + Environment.NewLine +
'\t' + "{" + Environment.NewLine +
'\t' + " MessageBox.Show(msg);" + Environment.NewLine +
'\t' + "}" + Environment.NewLine +
Environment.NewLine +
'\t' + "public void ShowForm()" + Environment.NewLine +
'\t' + "{" + Environment.NewLine +
'\t' + " Form frm = new Form();" + Environment.NewLine +
'\t' + " frm.Show();" + Environment.NewLine +
'\t' + "}" + Environment.NewLine +
" }" + Environment.NewLine +
"}";
}
private void button2_Click(object sender, EventArgs e)
{
CSharpCodeProvider objCSharpCodePrivoder = new CSharpCodeProvider();
CompilerParameters objCompilerParameters = new CompilerParameters();
objCompilerParameters.ReferencedAssemblies.Add("System.dll");
objCompilerParameters.ReferencedAssemblies.Add("System.Windows.Forms.dll");
objCompilerParameters.GenerateExecutable = false;
objCompilerParameters.GenerateInMemory = true;
CompilerResults cresult = objCSharpCodePrivoder.CompileAssemblyFromSource(objCompilerParameters, textBox1.Text);
if (cresult.Errors.HasErrors)
{
foreach (CompilerError err in cresult.Errors)
{
MessageBox.Show(err.ErrorText);
}
}
else
{
// 通过反射,执行代码
Assembly objAssembly = cresult.CompiledAssembly;
object obj = objAssembly.CreateInstance("CodeTest.Test");
MethodInfo objMI = obj.GetType().GetMethod("ShowForm");
objMI.Invoke(obj, null);
}
}
}
}
点击按钮“执行代码”,运行结果如下:
点击按钮“显示窗体”,代码执行如下:
因为自定义代码中有
using System;
using System.Windows.Forms;
需要上面两个类库才能执行,所以要在CompilerParameters中对这两个dll添加引用,既
objCompilerParameters.ReferencedAssemblies.Add("System.dll");
objCompilerParameters.ReferencedAssemblies.Add("System.Windows.Forms.dll");
反射时,命名空间的名字要写完整,实例中命名空间是CodeTest,类是Test,所以反射代码是objAssembly.CreateInstance("CodeTest.Test")
文章转载自https://blog.csdn.net/bdmh/article/details/22398077
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