我需要創建一類具有兩個屬性:在C#中使用委託作爲屬性是否正確?
- LogOutput
- ExceptionOutput
這些屬性(操作<>)發送消息或根據目標功能的異常。這個目標函數是通過屬性設置的。
目前,我有這樣的功能代碼:
public class Output
{
private Action<string> logOutput;
private Action<Exception, string> exceptionOutput;
public Action<string> LogOutput { set { this.logOutput = value; } get { return this.logOutput; } }
public Action<Exception, string> ExceptionOutput { set { this.exceptionOutput = value; } get { return this.exceptionOutput; } }
public Output() : this(null, null) { }
public Output(Action<string> logAction, Action<Exception, string> exceptionAction)
{
this.logOutput = logAction;
this.exceptionOutput = exceptionAction;
}
public void WriteLogMessage(string format, params object[] args)
{
if (this.logOutput != null)
logOutput(string.Format(format, args));
}
public void WriteExceptionMessage(Exception ex, string format, params object[] args)
{
if (this.exceptionOutput != null)
exceptionOutput(ex, string.Format(format, args));
}
}
這是我的表單代碼:
private void MainForm_Load(object sender, EventArgs e)
{
// my Output object
Output myOutput = new Output();
// set properties
myOutput.ExceptionOutput = this.WriteExceptionMessageToTextBox;
myOutput.LogOutput = this.WriteLogMessageToTextBox;
// test
myOutput.WriteLogMessage("this is my log message to text box");
myOutput.WriteExceptionMessage(new Exception("this is my exception"), "this is my exception message to text box");
}
private void WriteLogMessageToTextBox(string message)
{
// nothing to do here
if (this.txtBox.IsDisposed)
return;
if (this.InvokeRequired)
{
BeginInvoke(new MethodInvoker(delegate() { WriteLogMessageToTextBox(message); }));
}
else
{
// write to text box
this.txtBox.AppendText(message + Environment.NewLine);
}
}
private void WriteExceptionMessageToTextBox(Exception ex, string message)
{
// nothing to do here
if (this.txtBox.IsDisposed)
return;
if (this.InvokeRequired)
{
BeginInvoke(new MethodInvoker(delegate() { WriteExceptionMessageToTextBox(ex, message); }));
}
else
{
string msg = "";
msg += string.Format("Program:{0}", message);
msg += string.Format("Message{0}", ex.Message);
msg += string.Format("StackTrace:{0}", ex.StackTrace);
msg += string.Format("Source:{0}", ex.Source);
// write to text box
this.txtBox.AppendText(msg + Environment.NewLine);
}
}
這是正確的這種模式?還有另一種方法可以做到這一點?
如果「MyOutput中.ExceptionOutput = null「是可以接受的,那麼事件和委託並沒有什麼不同。事件是「正確的」,所以代表也是如此。 – 2012-07-05 15:42:14
它工作嗎?如果是這樣,這可能更適合CodeReview。 – 2012-07-05 15:43:16