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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;
}
}
}