C# 中调用函数完成后执行函数
我有一个 TextBox，在 LostFocus 事件中我调用一个函数，在这里我需要调用我的函数，在某些情况下必须删除 TextBox，所以当代码返回到 LostFocus 事件时，它给我一个 NullReferenceException 。
那我该怎么办呢？
仅当 LostFocus 函数完成时才可以调用我的函数吗？
谢谢。
你好！感谢您的回答..下面您可以看到我的问题的一个简单的：
void senseMessage_LostFocus(object sender, EventArgs e)
{
...
MyFunction();
}
void MyFunction()
{
...
senseList.RemoveItem(senseMessage);
... add some other items to senseList...
senseMessage = new StedySoft.SenseSDK.SensePanelTextboxItem();
senseMessage.Text = "test";
senseList.AddItem(senseMessage);
}
senseList 是一个项目列表，我需要始终将 senseMessage 放在列表的末尾。 因此，当 senseMessage 失去焦点（并准备好在列表的新项目中添加文本）时，我需要删除 senseMessage，添加新项目，然后重新添加 senseMessage。
我希望你能帮助我..
I've a TextBox, on LostFocus event of this i call a function, and here i need to call my function that in some situations have to delete the TextBox, so when the code come back to the LostFocus event, it give me a NullReferenceException.
So how can i do?
Is possible to call my Function only when the LostFocus function finished?
Thanks.
Hi! thanks for your answer.. below you can see a simple of my problem:
void senseMessage_LostFocus(object sender, EventArgs e)
{
...
MyFunction();
}
void MyFunction()
{
...
senseList.RemoveItem(senseMessage);
... add some other items to senseList...
senseMessage = new StedySoft.SenseSDK.SensePanelTextboxItem();
senseMessage.Text = "test";
senseList.AddItem(senseMessage);
}
senseList is a List of items, i need to have the senseMessage always at the end of the list.
So when the senseMessage Lost the focus (and is ready for add the text in a new item of the list) i need to delete senseMessage, add the new item, and reAdd the senseMessage.
i hope you can help me..
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delegate void VoidDelegate(); void senseMessage_LostFocus(object sender, EventArgs e) { BeginInvoke(new VoidDelegate(MyFunction), new object[]{}); }delegate void VoidDelegate(); void senseMessage_LostFocus(object sender, EventArgs e) { BeginInvoke(new VoidDelegate(MyFunction), new object[]{}); }LostFocus事件相当低级，并且与 WIN32 api 紧密结合。尝试改用Leave事件。如果仍然不起作用，请尝试使用 WindowsFormSynchronizationContext 来延迟调用您的函数，如下所示：
或类似的内容。抱歉，如果语法可能不准确，因为我现在运行的是 OS X，所以我没有 VS。
LostFocusevent is quite low-level and bound closely to WIN32 api. Try to useLeaveevent instead.If that still won't work, try to use
WindowsFormSynchronizationContextto delay invoke your function like this:or something like that. Sorry if the syntax might be inaccurate because I'm running OS X now so I have no VS.