处理程序堆栈溢出？！？！ [英] Handler Stack Overflow?!?!

问题描述

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, New
DataColumnChangeEventHandler(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, New
DataColumnChangeEventHandler(AddressOf Whatif_Changed)

会发生什么在Whatif_Changed？

What happens in Whatif_Changed?

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