如何让函数在 VB.net 中运行回调
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How to have a function run a callback in VB.net
提问by Jamie Hartnoll
I'm afraid I have been Googling this, but can't find an answer that I understand, or can use.
恐怕我一直在谷歌上搜索这个，但找不到我理解或可以使用的答案。
In Javascript, you can run a function and set a callback function which it calls after the first function has run:
在 Javascript 中，您可以运行一个函数并设置一个回调函数，该函数在第一个函数运行后调用：
function doThis(callBack){
// do things
// do things
if(callBack){
callBack();
}
}
Call this by: doThis(function () { alert("done") });
通过以下方式调用： doThis(function () { alert("done") });
So after it's finished doing things it calls an alert to tell you it's done.
因此，在它完成某件事后，它会调用警报来告诉您它已完成。
But how do you do the same server-side in VB.NET?
但是你如何在 VB.NET 中做同样的服务器端呢？
回答by sloth
Just create a method that takes an Actiondelegateas parameter:
只需创建一个将Action委托作为参数的方法：
Sub DoThis(callback as Action)
'do this
'do that
If Not callback Is Nothing Then
callback()
End If
End Sub
and you can call it like
你可以这样称呼它
DoThis(Sub() Console.WriteLine("via callback!"))
