Question

我有一个Windows窗体，其中所有控件都是动态创建的。

然而，所有按钮似乎都在触发＆＃34; Something＆＃34;在点击事件之前，以及＆＃34; Something＆＃34;导致我的组合框中的selectedindexchanged被触发。我已经完全了解了所声明的事件处理程序，并确保没有任何按钮将SIC作为事件进行修改。

我注意到使用鼠标单击按钮的正常行为是，当按下按钮但按下并释放按钮外的区域时，按钮不会被触发。

有趣的是，在我的情况下，点击本身会触发＆＃34; Something＆＃34;甚至在按下释放之前。

有人可以告诉我按钮发生了什么吗？

以下是InteliTrace活动，我似乎并不理解：

Calls for thread <No Name> (6976)
[System.Threading.ThreadHelper.ThreadStart()]
SESAdminForm.My.MyApplication.Main(String() Args = {String(0)})
[Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.Run(string[]      commandLine = {unknown})]
System.Windows.Forms.Application.Run(System.Windows.Forms.ApplicationContext context = {unknown})
ThreadContext.RunMessageLoop(int reason = {unknown}, System.Windows.Forms.ApplicationContext context = {unknown})
ThreadContext.RunMessageLoopInner(int reason = {unknown}, System.Windows.Forms.ApplicationContext context = {unknown})
ThreadContext.RunMessageLoopInner(int reason = {unknown}, System.Windows.Forms.ApplicationContext context = {unknown})
System.Windows.Forms.NativeWindow.DebuggableCallback(System.IntPtr hWnd = {unknown}, int msg = {unknown}, System.IntPtr wparam = {unknown}, System.IntPtr lparam = {unknown})
ControlNativeWindow.WndProc(ref System.Windows.Forms.Message m = {unknown})
ControlNativeWindow.OnMessage(ref System.Windows.Forms.Message m = {unknown})
System.Windows.Forms.Button.WndProc(ref System.Windows.Forms.Message m = {unknown})
System.Windows.Forms.ButtonBase.WndProc(ref System.Windows.Forms.Message m = {unknown})
System.Windows.Forms.Control.WndProc(ref System.Windows.Forms.Message m = {unknown})
System.Windows.Forms.Control.WmMouseDown(ref System.Windows.Forms.Message m = {unknown}, System.Windows.Forms.MouseButtons button = {unknown}, int clicks = {unknown})
System.Windows.Forms.Control.FocusInternal()
System.Windows.Forms.NativeWindow.DebuggableCallback(System.IntPtr hWnd = {unknown}, int msg = {unknown}, System.IntPtr wparam = {unknown}, System.IntPtr lparam = {unknown})
ControlNativeWindow.WndProc(ref System.Windows.Forms.Message m = {unknown})
ControlNativeWindow.OnMessage(ref System.Windows.Forms.Message m = {unknown})
System.Windows.Forms.Button.WndProc(ref System.Windows.Forms.Message m = {unknown})
System.Windows.Forms.ButtonBase.WndProc(ref System.Windows.Forms.Message m = {unknown})
System.Windows.Forms.Control.WndProc(ref System.Windows.Forms.Message m = {unknown})
System.Windows.Forms.Control.WmSetFocus(ref System.Windows.Forms.Message m = {unknown})
System.Windows.Forms.ContainerControl.ActivateControlInternal(System.Windows.Forms.Control control = {unknown})
System.Windows.Forms.ContainerControl.ActivateControlInternal(System.Windows.Forms.Control control = {unknown}, bool originator = {unknown})
System.Windows.Forms.ContainerControl.AssignActiveControlInternal(System.Windows.Forms.Control value = {unknown})
System.Windows.Forms.ContainerControl.UpdateFocusedControl()
System.Windows.Forms.ContainerControl.EnterValidation(System.Windows.Forms.Control enterControl = {unknown})
System.Windows.Forms.ContainerControl.ValidateThroughAncestor(System.Windows.Forms.Control ancestorControl = {unknown}, bool preventFocusChangeOnError = {unknown})
System.Windows.Forms.Control.PerformControlValidation(bool bulkValidation = {unknown})
System.Windows.Forms.Control.NotifyValidating()
System.Windows.Forms.ComboBox.OnValidating(System.ComponentModel.CancelEventArgs e = {unknown})
System.Windows.Forms.ComboBox.NotifyAutoComplete()
System.Windows.Forms.ComboBox.NotifyAutoComplete(bool setSelectedIndex = {unknown})
Set System.Windows.Forms.ComboBox.SelectedIndex(int value = {unknown})
System.Windows.Forms.ComboBox.OnSelectedIndexChanged(System.EventArgs e = {unknown})
SESAdminForm.DataEntry.cBox_SelectionChangeCommittedUseItem2(Object sender = {System.Windows.Forms.ComboBox}, System.EventArgs e = {System.EventArgs})
SESAdminForm.DataEntry.DisplayText()

- ＆GT;有两个与按钮相关的消息，但有一个消息似乎甚至在mousedown事件之前发生。

感谢您的时间。

Answer 1

我面临类似的问题，原因似乎是“重复”的组合框条目（文本相同，但值不是）和我在组合框上设置的自动完成。我没有修复，但问题似乎是表单的所有子元素可以一起验证，验证会触发NotifyAutoComplete，然后可以更改所选索引。

Microsoft在此https://msdn.microsoft.com/en-us/library/system.windows.forms.combobox.autocompletemode%28v=vs.110%29.aspx提到问题，并注释“如果维护的源中存在重复条目，则自动完成行为无法预测。”

这是源代码，因此您可以了解正在发生的事情;

http://referencesource.microsoft.com/#System.Windows.Forms/winforms/Managed/System/WinForms/ComboBox.cs,21e4308c05a79f0a

基本上，对ComboBox.OnValidating（）的调用检查组合框是否启用了自动完成。如果是，那么它假定我们正在验证，因为用户正在键入。 OnValidating调用NotifyOnComplete并尝试设置所选索引，这是通过比较文本值来实现的。这很粗糙，不容易规避。

我的修复方法是在我调用Form.ValidateChildren（）之前关闭我的组合框上的自动完成，这会触发此废话，然后在验证后恢复自动完成值。

我表单上的所有按钮似乎都在触发“某些东西”

1 个答案: