.NET C# 反射机制实现无Bug插件演示源

利用.NET反射机制，只要程序实现了预定的接口，就可以被主程序实例化，并调用显示方法将其显示而不需要知道其类名。支持XML格式的配置文件。
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using System.IO;using System.Data.OleDb;using System.Reflection;using MyInterfaces;namespace MyWinForm{ public partial class MainForm : Form { /// <summary> /// 是否修改 /// </summary> private bool Changge = false; List<String[]> ClassPaths = new List<String[]>(); public MainForm() { InitializeComponent(); } /// <summary> /// 程序Load事件，把配置文件信息读入程序 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void MainForm_Load(object sender, EventArgs e) { if (!File.Exists("配置.xml")) { return; } DataSet ds = new DataSet(); try { ds.ReadXml("配置.xml"); } catch { return; } DataTable dt; try { dt = ds.Tables[0]; } catch { return; } for (Int32 i = 0; i < dt.Rows.Count; i ) { String[] Stemp = new String[3]; Stemp[0] = dt.Rows[i]["ClassName"].ToString(); Stemp[1] = dt.Rows[i]["FilePath"].ToString(); Stemp[2] = dt.Rows[i]["Direction"].ToString(); ClassPaths.Add(Stemp); listBox1.Items.Add(dt.Rows[i]["ClassName"]); } } /// <summary> /// 检测按钮 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void btnJianCe_Click(object sender, EventArgs e) { StatusText.Text = "正在检测"; String[] files = Directory.GetFiles(Application.StartupPath "\\Plugins", "*.dll"); Assembly Assly; Type[] Types; foreach (String ff in files) { try { Assly = Assembly.LoadFile(ff); } catch { continue; } Types = Assly.GetTypes(); foreach (Type tp in Types) { if (IsValidPlugin(tp)) { if (IsContains(tp.FullName, ff)) { continue; } String[] Stemp = new String[3]; Stemp[0] = tp.FullName; Stemp[1] = ff; Stemp[2] = ""; listBox1.Items.Add(tp.FullName); ClassPaths.Add(Stemp); Changge = true; } } } StatusText.Text = "完成检测"; } /// <summary> /// 判断类是否实现了接口 /// </summary> /// <param name="t"></param> /// <returns></returns> private bool IsValidPlugin(Type t) { Type[] Interfaces = t.GetInterfaces(); foreach (Type Ifs in Interfaces) { if (Ifs.FullName == "MyInterfaces.WinFormInterface") { return true; } } return false; } /// <summary> /// 判断是否有重复的类型和文件名 /// </summary> /// <param name="classname"></param> /// <param name="filepath"></param> /// <returns></returns> private bool IsContains(String classname,String filepath) { foreach (String[] ss in ClassPaths) { if (ss[0] == classname && ss[1] == filepath) { return true; } } return false; } /// <summary> /// 运行按钮 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void btnYunXing_Click(object sender, EventArgs e) { if (listBox1.SelectedIndex == -1) { return; } Assembly asbly; try { asbly = Assembly.LoadFile((ClassPaths[listBox1.SelectedIndex])[1]); } catch { MessageBox.Show("系统找不到指定文件或者非有效的dll文件"); //将文件内无效的项目移除 ClassPaths.RemoveAt(listBox1.SelectedIndex); listBox1.Items.RemoveAt(listBox1.SelectedIndex); Changge = true; return; } Object oo = asbly.CreateInstance((ClassPaths[listBox1.SelectedIndex])[0]); MyInterfaces.WinFormInterface ooshow = (MyInterfaces.WinFormInterface)oo; (ClassPaths[listBox1.SelectedIndex])[2] = ooshow.GetDirectons; ooshow.ShowIt(); } /// <summary> /// 写配置文件 /// </summary> private void WriteInfo() { if (ClassPaths.Count == 0) { try { FileInfo fi = new FileInfo("配置.xml"); fi.Delete(); return; } catch { return; } } FileStream FS = new FileStream("配置.xml", FileMode.Create); System.Xml.XmlTextWriter myXml = new System.Xml.XmlTextWriter(FS, System.Text.Encoding.Default); myXml.Formatting = System.Xml.Formatting.Indented; myXml.WriteStartDocument(true); myXml.WriteStartElement("ClassInfo"); Int32 id = 0; foreach (String[] cp in ClassPaths) { myXml.WriteStartElement("Class"); myXml.WriteAttributeString("ID", id.ToString()); myXml.WriteElementString("ClassName", cp[0]); myXml.WriteElementString("FilePath", cp[1]); myXml.WriteElementString("Direction", cp[2]); myXml.WriteEndElement(); id ; } myXml.WriteEndElement(); myXml.WriteEndDocument(); myXml.Close(); FS.Close(); } /// <summary> /// listBox1的点击事件 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void listBox1_SelectedIndexChanged(object sender, EventArgs e) { if (listBox1.SelectedIndex == -1) { return; } if ((ClassPaths[listBox1.SelectedIndex])[2] != "") { textBox1.Text=(ClassPaths[listBox1.SelectedIndex])[2]; return; } Assembly asbly = Assembly.LoadFile((ClassPaths[listBox1.SelectedIndex])[1]); Object oo = asbly.CreateInstance((ClassPaths[listBox1.SelectedIndex])[0]); MyInterfaces.WinFormInterface ooshow = (MyInterfaces.WinFormInterface)oo; (ClassPaths[listBox1.SelectedIndex])[2] = ooshow.GetDirectons; textBox1.Text = ooshow.GetDirectons; Changge = true; } }}