DataGridView单元格导致对简单箭头键的验证 [英] DataGridView cell causing validation on simple arrow keys

问题描述

DataGridView 为什么通过箭头键简单的导航来增加 CellValidating 事件？我该怎么防止呢？以下是关于 DataGridView 的状态，当它调用 CellValidating 时：

Why does DataGridView raise CellValidating event upon simple navigation through arrow keys? How can I prevent it? Here is the key information about DataGridView state when it calls CellValidating:

EditMode = EditOnKeyStrokeOrF2
IsCurrentCellInEditMode = False
e.FormattedValue = [Same as the current value of the cell]

如您所见，用户没有触发任何编辑操作。他只是按着右箭头键移动通过单元格。一个人不会期望在这一点上发生验证，对吗？

As you can see, user has not triggered any editing operation. He's just moving across the cells by pressing right-arrow key. One would not expect validation to occur at this point, right?

注意：检查调用堆栈显示 KeyDown 事件触发一个 CommitEdit 调用，这又调用 OnCellValidating 。

Note: Examining call stack shows that KeyDownevent triggers a CommitEdit call, which in turn raises OnCellValidating.

推荐答案

喜欢与否，这是事情想要工作的方式。请参阅 MSDN on CellValidating ：

Like it or not, this is the way things are desigend to work. See MSDN on CellValidating:

当单元格输入焦点失效时发生内容验证。

Occurs when a cell loses input focus, enabling content validation.

并使其完成 MSDN 在 CellValidated ：

单元格验证完成后发生。

Occurs after the cell has finished validating.

最直接和可读的解决方案可能是在$ code> CellValidating 事件开始时放置一个这样的行：

The most direct and readable solution is probably to put a line like this at the start of the CellValidating event:

if (!dataGridView1.IsCurrentCellDirty)  return;

设计行为的一个原因可能是实际需要用户输入创建有效的单元格值。不是你的情况，但仍然是一个可以想象的要求。

One reason for the designed behaviour could be the case where a user input is actually needed to create a valid cell value. Not your case, but still a conceivable requirement.

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