处理程序堆栈溢出？！？！

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请帮忙！ 我在一个类中有一个处理程序，可以处理表格中的列是否被修改为，因此： dtWhatif = dsOp.Tables（" whatif"） AddHandler dtWhatif.ColumnChanged，New DataColumnChangeEventHandler（AddressOf Whatif_Changed） 测试时，我收到一个错误：类型未处理的异常 'System.dll中出现'System.StackOverflowException'' 所以我放入一个调试语句来查看堆栈溢出的原因。这个 处理程序被称为4082次！我所做的只是更改数据网格的一个 单元格中的值！ 为什么？！为什么？！ Tom

Please help! I have a handler in a class that handles when a column in a table is modified, as such: dtWhatif = dsOp.Tables("whatif") AddHandler dtWhatif.ColumnChanged, New DataColumnChangeEventHandler(AddressOf Whatif_Changed) When testing this, I got an error: An unhandled exception of type ''System.StackOverflowException'' occurred in system.dll So I put a debug statement in to see why the stack is overflowing. This handler was called 4082 times! All I did was change the value in one cell of a datagrid! Why?! Why?! Tom

推荐答案

> dtWhatif = dsOp.Tables（" whatif"） > dtWhatif = dsOp.Tables("whatif") AddHandler dtWhatif.ColumnChanged，New DataColumnChangeEventHandler（AddressOf Whatif_Changed） AddHandler dtWhatif.ColumnChanged, New DataColumnChangeEventHandler(AddressOf Whatif_Changed)

在Whatif_Changed中会发生什么？

What happens in Whatif_Changed?

现在，它只是调用并清空函数。我只是测试了 处理程序，发现它没有按预期工作。 Tom Chris Dunaway写道： Right now, it just calls and empty function. I was just testing the handler, and found it doesn''t work as expected. Tom Chris Dunaway wrote: dtWhatif = dsOp.Tables（" whatif"） AddHandler dtWhatif.ColumnChanged，New DataColumnChangeEventHandler（AddressOf Whatif_Changed） dtWhatif = dsOp.Tables("whatif") AddHandler dtWhatif.ColumnChanged, NewDataColumnChangeEventHandler(AddressOf Whatif_Changed)

Whatif_Changed会发生什么？

What happens in Whatif_Changed?

I刚尝试在事件处理程序中注释掉对其他函数的调用。你猜怎么着？没问题。如果处理程序调用另一个函数，我只得到堆栈 重载。这不是一个好的的事情，因为我需要能够在 列发生变化时调用多个函数。有什么建议吗？ Tom Chris Dunaway写道： I just tried commenting out the call to the other function from within the event handler. Guess what? No problem. I only get the stack overload if the handler calls another function. This is not a good thing, because I need to be able to call several functions when the column has changed. Any suggestions? Tom Chris Dunaway wrote: dtWhatif = dsOp.Tables（" whatif"） AddHandler dtWhatif.ColumnChanged，New DataColumnChangeEventHandler（AddressOf Whatif_Changed） dtWhatif = dsOp.Tables("whatif") AddHandler dtWhatif.ColumnChanged, NewDataColumnChangeEventHandler(AddressOf Whatif_Changed)

会发生什么在Whatif_Changed？

What happens in Whatif_Changed?