危险字符过滤的类（完美版）

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.IO;
using System.Text;
using System.Text.RegularExpressions;
using System.Runtime.Remoting;
using System.Runtime.Remoting.Proxies;
using System.Runtime.Remoting.Messaging;
using System.Reflection;
using FilterRealProxy;

namespace FilterForm
{
/// <summary>
/// FilterFormTest 的摘要说明。
/// </summary>
public class FilterFormTest : System.Windows.Forms.Form
{
private System.Windows.Forms.Button btnFilter;
private System.Windows.Forms.OpenFileDialog openFileDialog1;
private System.Windows.Forms.TextBox MyTextBox;
private System.Windows.Forms.Button btnOpenFile;
private System.Windows.Forms.ListBox listBox1;
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.Container components = null;

public FilterFormTest()
{
//
// Windows 窗体设计器支持所必需的
//
InitializeComponent();

//
// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
//
}

/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if(components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}

#region Windows 窗体设计器生成的代码
/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.MyTextBox = new System.Windows.Forms.TextBox();
this.btnFilter = new System.Windows.Forms.Button();
this.openFileDialog1 = new System.Windows.Forms.OpenFileDialog();
this.btnOpenFile = new System.Windows.Forms.Button();
this.listBox1 = new System.Windows.Forms.ListBox();
this.SuspendLayout();
//
// MyTextBox
//
this.MyTextBox.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
| System.Windows.Forms.AnchorStyles.Left)
| System.Windows.Forms.AnchorStyles.Right)));
this.MyTextBox.Location = new System.Drawing.Point(8, 8);
this.MyTextBox.Multiline = true;
this.MyTextBox.Name = "MyTextBox";
this.MyTextBox.ScrollBars = System.Windows.Forms.ScrollBars.Both;
this.MyTextBox.Size = new System.Drawing.Size(432, 360);
this.MyTextBox.TabIndex = 0;
this.MyTextBox.Text = "";
//
// btnFilter
//
this.btnFilter.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
this.btnFilter.Location = new System.Drawing.Point(448, 232);
this.btnFilter.Name = "btnFilter";
this.btnFilter.Size = new System.Drawing.Size(88, 23);
this.btnFilter.TabIndex = 1;
this.btnFilter.Text = "去除危险字符";
this.btnFilter.Click += new System.EventHandler(this.btnFilter_Click);
//
// btnOpenFile
//
this.btnOpenFile.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
this.btnOpenFile.Location = new System.Drawing.Point(456, 48);
this.btnOpenFile.Name = "btnOpenFile";
this.btnOpenFile.TabIndex = 2;
this.btnOpenFile.Text = "打开文件";
this.btnOpenFile.Click += new System.EventHandler(this.btnOpenFile_Click);
//
// listBox1
//
this.listBox1.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
this.listBox1.ItemHeight = 12;
this.listBox1.Items.AddRange(new object[] {
"Script脚本",
"Html代码",
"Object物件",
"链接脚本",
"Iframe内框架",
"Frameset框架",
"Src插入性脚本",
"非法字符",
"Include包含文件",
"以上所有"});
this.listBox1.Location = new System.Drawing.Point(448, 88);
this.listBox1.MultiColumn = true;
this.listBox1.Name = "listBox1";
this.listBox1.Size = new System.Drawing.Size(96, 124);
this.listBox1.TabIndex = 3;
//
// FilterFormTest
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(544, 381);
this.Controls.Add(this.listBox1);
this.Controls.Add(this.btnOpenFile);
this.Controls.Add(this.btnFilter);
this.Controls.Add(this.MyTextBox);
this.Name = "FilterFormTest";
this.Text = "FilterFormTest";
this.ResumeLayout(false);

}
#endregion

/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new FilterFormTest());
}
///<summary>
/// 实体类：该实体类必须从MarshalByRefObject继承,所以被过滤的实体类不能再从其他类继承或实现接口,这是使用透明代理的局限性。
///</summary>
public class Entry : MarshalByRefObject
{
public Entry()
{
}
public static Entry CreateInstance()
{
Entry entry=new Entry();
RealProxy realProxy = new FilterRealProxy.FilterRealProxy(entry);
object transparentProxy = realProxy.GetTransparentProxy();
return (Entry)transparentProxy;
}

private string _body;
public virtual string Body
{
[StringFilter((FilterType)16)]
get{return _body;}
set{_body = value;}
}
}

private void btnFilter_Click(object sender, System.EventArgs e)
{
Entry en=Entry.CreateInstance();
en.Body = MyTextBox.Text;
MyTextBox.Text=en.Body;
}

private void btnOpenFile_Click(object sender, System.EventArgs e)
{
OpenFileDialog dlgFile=new OpenFileDialog();
dlgFile.Filter="Html(*.htm)|*.htm|Text(*.txt)|*.txt|All Files(*.*)|*.*";
if(dlgFile.ShowDialog() == DialogResult.OK)
{
System.IO.StreamReader sr=new System.IO.StreamReader(dlgFile.FileName,System.Text.Encoding.Default);//得到一个含有script脚本的字符串
MyTextBox.Text = sr.ReadToEnd();
sr.Close();
}
}

private void comboBox1_SelectedIndexChanged(object sender, System.EventArgs e)
{

}
}
}