C# 如何禁用 WinForms DataGrid 中的按钮单元格？
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How do I disable a button cell in a WinForms DataGrid?
提问by Don Kirkby
I have a WinForms application with a DataGridView control and a column of DataGridViewButtonCell cells within that. When I click on one of these buttons, it starts a background task, and I'd like to disable the buttons until that task completes.
我有一个 WinForms 应用程序，其中包含一个 DataGridView 控件和一列 DataGridViewButtonCell 单元格。当我单击这些按钮之一时，它会启动一个后台任务，我想禁用这些按钮，直到该任务完成。
I can disable the DataGridView control, but it gives no visual indication that the buttons are disabled. I want the user to see that the buttons are disabled, and to notice that the task has finished when the buttons are enabled again.
我可以禁用 DataGridView 控件，但它没有给出按钮被禁用的视觉指示。我希望用户看到按钮被禁用，并注意到当按钮再次启用时任务已经完成。
Bonus points for a method that allows me to disable the buttons individually, so I can leave one of the buttons enabled while the task runs. (Note that I can't actually give out bonus points.)
允许我单独禁用按钮的方法的奖励积分，因此我可以在任务运行时启用其中一个按钮。（请注意，我实际上无法发放奖励积分。）
采纳答案by Don Kirkby
Here's the best solution I've found so far. This MSDN articlegives the source code for a cell class that adds an Enabled property.
这是我迄今为止找到的最佳解决方案。此MSDN 文章提供了添加 Enabled 属性的单元格类的源代码。
It works reasonably well, but there are two gotchas:
它工作得相当好，但有两个问题：
- You have to invalidate the grid after setting the Enabled property on any cells. It shows that in the sample code, but I missed it.
- It's only a visual change, setting the Enabled property doesn't actually enable or disable the button. The user can still click on it. I could check the enabled property before executing the click event, but it also seemed to be messing up the appearance when the user clicked on it. Instead, I just disabled the entire grid. That works alright for me, but I'd prefer a method that allows me to disable some buttons without disabling the entire grid.
- 在任何单元格上设置 Enabled 属性后，您必须使网格无效。它在示例代码中显示了这一点，但我错过了。
- 这只是一个视觉变化，设置 Enabled 属性实际上并没有启用或禁用按钮。用户仍然可以点击它。我可以在执行 click 事件之前检查 enabled 属性，但是当用户单击它时，它似乎也弄乱了外观。相反，我只是禁用了整个网格。这对我来说没问题，但我更喜欢一种方法，它允许我禁用某些按钮而不禁用整个网格。
There's a similar sample in the DataGridView FAQ.
DataGridView FAQ 中有一个类似的示例。
回答by Austin Salonen
You could give this a try:
你可以试试这个：
When you click on the cell...
当你点击单元格...
- Check to see if the process with the current row identifier is running from a class-level list; if so, exit the cell click event.
- Store the row identifier in the class-level list of running processes.
- Change the button text to "Running..." or something appropriate.
- Attach a basic RunWorkerCompleted event handler to your process (explained shortly).
- Call backgroundWorker.RunWorkerAsync(rowIdentifier).
- 检查具有当前行标识符的进程是否正在从类级列表运行；如果是这样，退出单元格单击事件。
- 将行标识符存储在正在运行的进程的类级列表中。
- 将按钮文本更改为“正在运行...”或其他适当的内容。
- 将基本的 RunWorkerCompleted 事件处理程序附加到您的进程（稍后解释）。
- 调用 backgroundWorker.RunWorkerAsync(rowIdentifier)。
In the DoWork event handler...
在 DoWork 事件处理程序中...
- Set e.Result = e.Argument (or create an object that will return both the argument and your desired result)
- 设置 e.Result = e.Argument（或创建一个将返回参数和您想要的结果的对象）
In the RunWorkerCompleted event hanlder...
在 RunWorkerCompleted 事件处理程序中...
- Remove the row identifier from the running processes list (e.Result is the identifier).
- Change the button text from "Running..." to "Ready"
- 从正在运行的进程列表中删除行标识符（e.Result 是标识符）。
- 将按钮文本从“正在运行...”更改为“就绪”
