wpf 在 Dispatchertimer.Tick 事件中发送一个额外的参数
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send a extra argument in Dispatchertimer.Tick event
提问by ahmad05
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
我的问题是如何在 Dispatchertimer.Tick 事件中发送一些参数，这里是代码：我想要的是在 dispatcheTimer_Tick 接收一个整数值
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
我想做的是这样的
private void dispatcherTimer_Tick(object sender, EventArgs e,int a)
{
//.Text = DateTime.Now.Second.ToString();
}
how to send a value from a calling point??
如何从调用点发送值？
回答by Servy
While there are a number of ways, I find it most convenient to use anonymous methods to close over variables when doing this:
虽然有多种方法，但我发现在执行此操作时使用匿名方法关闭变量最方便：
dispatcherTimer.Tick += (s, args) => myControl.Text = DateTime.Now.Second.ToString();
If you have a handful of lines you could also do something more like:
如果您有几行代码，您还可以执行以下操作：
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:
如果您的代码不止几行，那么您可能还需要另一种方法，但您可以使用 lambda 来调用该方法：
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 objectfirst.) as well as adding in additional local variables.
这对于在不需要事件处理程序委托的参数时忽略它们很方便（我几乎从不使用sender，如果需要，我自己传递实际对象，以便它不会object首先转换为。）以及添加额外的局部变量。
回答by Austin Salonen
If you know aat the time you're attaching the event handler, you can do something like this:
如果您a当时知道要附加事件处理程序，则可以执行以下操作：
int a = 0;
dispatcherTimer.Tick += (sender, e) =>
{
/* a is available here */
};
