在发送事件Dispatchertimer.Tick一个额外的参数 [英] send a extra argument in Dispatchertimer.Tick event

问题描述

我的问题是如何在Dispatchertimer.Tick事件
这里给一些参数是代码：我想是在接受dispatcheTimer_Tick

一个整数值

  dispatcherTimer.Tick + =新的EventHandler（dispatcherTimer_Tick）; 
 
私人无效dispatcherTimer_Tick（对象发件人，EventArgs五）
 {
 //.Text = DateTime.Now.Second.ToString（）; 
 
} 
  

我想要做的就是这样的事情。

 私人无效dispatcherTimer_Tick（对象发件人，EventArgs的发送，int类型的）
 {
 //.Text =日期时间。 Now.Second.ToString（）; 
 
} 
  

如何从调用点?? <发送的值/ p>

解决方案

虽然有许多方法，我觉得最方便使用匿名方法来关闭在执行此操作时变量：

  dispatcherTimer.Tick + =（S，参数）=> myControl.Text = DateTime.Now.Second.ToString（）; 
  

如果你有行了一把，你还可以做更多的东西，如：

  INT数= 5; 
 dispatcherTimer.Tick + =（S，参数）=> 
 {
字符串值=的someMethod（）; 
串otherValue = DateTime.Now.Second.ToString（）
 myControl.Text =值+ otherValue +号; 
} 
  

如果您已经不仅仅是一个行屈指可数更多，那么你可能还想要另一个方法，但你可以使用lambda调用该方法：

  int值= 5; 
 dispatcherTimer.Tick + =（S，参数）=> myRealMethod（someControl，值）; 
 
公共无效myRealMethod（控制someControl，int值）
 {
 someControl.Text =价值; 
} 
  

这时候你不便于事件处理程序的委托都忽略参数吨需要他们（我几乎从来不使用发件人，我通过实际的对象自己，如果我需要它，这样它不会转换为对象第一），以及额外的局部变量添加。

my question is how can i send some arguments in Dispatchertimer.Tick event here is the code: what i wanted to is receive a integer value at dispatcheTimer_Tick

    dispatcherTimer.Tick += new EventHandler(dispatcherTimer_Tick);

    private void dispatcherTimer_Tick(object sender, EventArgs e)
    {
        //.Text = DateTime.Now.Second.ToString();

    }

what i wanted to do is something like this

    private void dispatcherTimer_Tick(object sender, EventArgs e,int a)
    {
        //.Text = DateTime.Now.Second.ToString();

    }

how to send a value from a calling point??

解决方案

While there are a number of ways, I find it most convenient to use anonymous methods to close over variables when doing this:

dispatcherTimer.Tick += (s, args) => myControl.Text = DateTime.Now.Second.ToString();

If you have a handful of lines you could also do something more like:

int number = 5;
dispatcherTimer.Tick += (s, args) => 
{
    string value = someMethod();
    string otherValue = DateTime.Now.Second.ToString()
    myControl.Text = value + otherValue + number;
}

If you have more than just a handful of lines then you probably still want another method, but you can use a lambda to call that method:

int value = 5;
dispatcherTimer.Tick += (s, args) => myRealMethod(someControl, value);

public void myRealMethod(Control someControl, int value)
{
    someControl.Text = value;
}

This is convenient for both ignoring parameters of the event handler's delegate when you don't need them (I almost never use sender, I pass the actual object myself if I need it so that it's not cast to object first.) as well as adding in additional local variables.

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