C# 插件构架实战

public interface IApplicationObject
{
void Alert(string msg); // 产生一条信息
    void ShowInStatusBar(string msg); // 将指定的信息显示在状态栏
    IDocumentObject QueryCurrentDocument(); // 获取当前使用的文档对象
    IDocumentObject[] QueryDocuments(); // 获取所有的文档对象

// 设置事件处理器
    void SetDelegate(Delegates whichOne, EventHandler targer);
}
// 目前只需要这一个事件

public enum Delegates
{
Delegate_ActiveDocumentChanged
}

///
/// 编辑器对象必须实现这个接口
///
public interface IDocumentObject
{
// 这些属性是 RichTextBox 控件的相应的属性映射

string SelectionText { get; set; }
Color SelectionColor { get; set; }
Font SelectionFont { get; set; }
int SelectionStart { get; set; }
int SelectionLength { get; set; }
string SelectionRTF { get; set; }
bool HasChanges { get; }
void Select(int start, int length);
void AppendText(string str);
void SaveFile(string fileName);
void SaveFile();
void OpenFile(string fileName);
void CloseFile();
}

///
/// 本程序的插件必须实现这个接口
///
public interface IPlugin
{
ConnectionResult Connect(IApplicationObject app);
void OnDestory();
void OnLoad();
void Run();
}
///
/// 表示插件与主程序连接的结果
///
public enum ConnectionResult
{
Connection_Success,
Connection_Failed
}

///
/// 用来指定一个插件的相关信息
///
public class PluginInfoAttribute : System.Attribute
{
///
    /// Deprecated. Do not use.
    ///

public PluginInfoAttribute() { }
public PluginInfoAttribute(
string name, string version,
string author, string webpage, bool loadWhenStart)
{
// 细节已略去
    }
public string Name { get { return _Name; } }
public string Version { get { return _Version; } }
public string Author { get { return _Author; } }
public string Webpage { get { return _Webpage; } }
public bool LoadWhenStart { get { return _LoadWhenStart; } }
///
    /// 用来存储一些有用的信息
    ///
    public object Tag
{
get { return _Tag; }
set { _Tag = value; }
}
///
    /// 用来存储序号
    ///
    public int Index
{
get { return _Index; }
set { _Index = value; }
}
private string _Name = "";
private string _Version = "";
private string _Author = "";
private string _Webpage = "";
private object _Tag = null;
private int _Index = 0;
// 暂时不会用
    private bool _LoadWhenStart = true;
}
//用这个类修饰你的插件，并让他实现 IPlugin 接口：

///
/// My Pluging 1( Just for test )
///
[PluginInfo(
"My Pluging 1( Just for test )",
"1.0",
"Jack H Hansen",
"http://blog.csdn.net/matrix2003b", true)
]
public class MyPlugin1 : IPlugin
{
public MyPlugin1() { }

#region IPlugin 成员

// 细节已略去

#endregion

private IApplicationObject _App;
private IDocumentObject _CurDoc;
}

private bool IsValidPlugin(Type t)
{
bool ret = false;
Type[] interfaces = t.GetInterfaces();
foreach (Type theInterface in interfaces)
{
if (theInterface.FullName == "CSPluginKernel.IPlugin")
{
ret = true;
break;
}
}
return ret;
}

plugins.Add(pluginAssembly.CreateInstance(plugingType.FullName));