我需要创建一个包含两个属性的类:
这些属性(Actions<>)根据目标函数发送消息或异常。此目标函数通过属性设置。
目前,我有这个功能代码:
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));
}
}
这是我的表格代码:
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);
}
}
这个型号是对的吗?还有另一种方法吗?
答案 0 :(得分:8)
这个型号是对的吗?还有另一种方法吗?
这必然是没有错的。但是,events 可能是处理此问题的更常用方法,因为您在此方案中有效地将委托用作事件。
使用事件确实有一个显着的优点(可能),因为您也可以轻松拥有多个订阅者,这样可以让多个项目“监听”异常或日志消息变得简单。 (*虽然这也适用于代表,但它不是使用代理的标准方法..)
答案 1 :(得分:1)
抱歉offtopic但使用StringBuilder
string
不喜欢编辑
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);
StringBuilder sb = new StringBuilder();
sb.Append(string.Format("Program:{0}", message));
sb.Append(string.Format("Message{0}", ex.Message));
sb.Append(string.Format("StackTrace:{0}", ex.StackTrace));
sb.Append(string.Format("Source:{0}", ex.Source));
string result = sb.ToString();