“部分模态” MDI 应用程序中的表单
我有一个 MDI 应用程序。用户可以打开不同的非模态表单，例如表单 A 和表单 B。表单 A 上有一个按钮可以打开另一个表单（比如说表单 C），表单 B 也是如此（一个按钮打开表单 D）。我想要实现的目标是让C阻止A，D阻止B。 ShowDialog 不起作用，因为它阻止了整个应用程序，所以我尝试禁用表单 A，然后在布尔值上循环一段时间，当 C 关闭时该布尔值设置为 false （即： while (blocked) Application.DoEvents() ;）。在下面的代码行中，我重新启用 A，然后使用从 C 获得的结果。 这似乎可行，但如果我从 A 打开 C，然后从 B 打开 D，则 A 会被 C 和 D 阻止，而不仅仅是 D 被阻止。 有没有办法实现我想要做的事情？
I've got an MDI application. The user can open different non modal forms, for instance form A and form B. On form A there is a button which opens another form (let's say form C) and the same goes for form B (a button opening form D). What I'm trying to achieve is to have C blocking A and D blocking B.
ShowDialog doesn't work because it blocks the whole app, so I tried to disable form A, and then loop with a while on a boolean which is set to false when C is closed (i.e.: while (blocked) Application.DoEvents();). In the following lines of code I re-enable A and then use the result obtained from C.
It seems to work, but if I open C from A and then D from B, A is blocked by both C and D and not only by D.
Is there a way to achieve what I'm trying to do?
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评论（3）
也许这样模拟你想要的会更好：
BD 也类似，无论什么组合......
Maybe it would be better to simulate what you want like this:
Similar goes for B-D, and whatever combination...
您可以使用 Form.Activate 来强制某种形式。例如，当 D 阻止 B 并且用户选择（激活/将焦点设置到）B 时，您可以在 D 上调用 Form.Activate。这不是完全模态的，但会强制执行表单到表单的关系。当然，当没有D来阻止B时，你就不会调用Activate。这种方法还可以消除使用 DoEvents 的需要因为没有表单会真正被锁定。
You could use Form.Activate to force a sort of modality. For example, when D is blocking B and the user selects (activates/sets focus to) B you could call Form.Activate on D. It's not quite modal but would enforce your Form-to-Form relationships. Of course when there is no D to block B you would not call Activate. This approach would also rid of the need to use DoEvents since no Form would ever really be locked.
最后是这样解决的：
在A的方法中打开CI
1.禁用表单A
2.创建C的一个实例（如果我在C关闭后需要它的一些数据，则将其存储在A的字段中）
3. 将A类中定义的方法cClosed附加到C实例的FormClosed事件
4.打开表格C
在方法 cClosed I 中：
1. 重新启用表单 A
2. C 关闭后做我需要做的事情
3.清除包含C的字段（如果存在）
In the end solved it this way:
in the method of A that opens C I
1. disable form A
2. create an instance of C (and store it in a field of A if I will need some of its data after C has been closed)
3. attach a method cClosed defined in class A to event FormClosed of the instance of C
4. open form C
In the method cClosed I:
1. reenable form A
2. do whatever I need after the closing of C
3. clear the field containing C (if present)