事件的三种类型，应用篇

同步事件
1.声明事件
//负责传递消息
public delegate void MethodCall(string message);
public static event MethodCall requestdata;

2.注册事件
Page_Load事件中注册事件
 requestdata+= new MethodCall(FormDataGridViewDataTable_requestdata);

3.显式的触发事件
private void button8_Click(object sender, EventArgs e)
{
    if (requestdata != null) requestdata("Click Me"+DateTime.Now.ToString());
}

4.执行事件
 private void FormDataGridViewDataTable_requestdata(string message)
{
     Text = message;
}

异步事件
1.声明事件

public event EventHandler AnalyseFileDataCompleted;
public void OnAnalyseFileDataCompleted()
{
     EventHandler handler = (EventHandler)AnalyseFileDataCompleted;
     if (handler != null)
     {
         handler.Invoke(this, null);
      }
}
2.注册事件
 AnalyseFileDataCompleted+=new EventHandler(FormDataGridViewDataTable_AnalyseFileDataCompleted);

3.显式的触发事件
private void button8_Click(object sender, EventArgs e)
{
    OnAnalyseFileDataCompleted();
}
4.执行事件
private void FormDataGridViewDataTable_AnalyseFileDataCompleted(object sender,EventArgs e)
{
    for (int i = 0; i < 12000000; i++)
    {
        Text = "异步事件";
     }
     MessageBox.Show("00");
}

泛型异步事件
1.声明事件
public event EventHandler<FileAnalysisEventArgs<T>> AnalyseFileDataChanged;
public void OnAnalyseFileDataChanged(FileAnalysisEventArgs<T> arg)
{
    EventHandler<FileAnalysisEventArgs<T>> handler = (EventHandler<FileAnalysisEventArgs<T>>)AnalyseFileDataChanged;
    if (handler != null)
    {
        handler.Invoke(this, arg);      //使用异步传送消息
     }
}

2.注册事件
_fileAnalyse.FileEvent.AnalyseFileDataCompleted += new EventHandler<FileAnalysisEventArgs<T>>(FileEvent_AnalyseFileDataCompleted);

3.显式的触发事件
private void button8_Click(object sender, EventArgs e)
{
  _fileAnalyseEvent.OnAnalyseFileDataChanged(new FileAnalysisEventArgs<T> { AnalyseEntity = tmpEty, LineNum = lineNum });
｝

4.执行事件
protected void FileEvent_AnalyseFileDataChanged(object sender, FileAnalysisEventArgs<T> e)
{
  _form.Invoke((MethodInvoker)delegate
   {
                      
    });
｝