Question

我想在表单级别读取KeyPress事件，但是当DataGridView控件具有焦点时遇到问题：第一个字符触发Form KeyPress事件两次。

以下是一小段代码：

Public Class Form1

    Public Sub New()

        ' This call is required by the designer.
        InitializeComponent()

        ' Enable key preview.
        Me.KeyPreview = True

        ' Create list of elements.
        Dim elements As New List(Of TestStuff)({New TestStuff})

        ' Add datagrid.
        Dim dataGridView As New DataGridView
        Me.Controls.Add(dataGridView)
        dataGridView.Dock = DockStyle.Fill
        dataGridView.DataSource = elements
    End Sub

    Private Sub MainFormView_KeyPress(sender As Object, e As KeyPressEventArgs) Handles Me.KeyPress
        Console.WriteLine(String.Format("KeyPress {0} value: {1}", Now, CStr(e.KeyChar)))
    End Sub

End Class

Public Class TestStuff
    Public Property Stuff As String
End Class

注意：仅当网格中有元素时才会出现这种情况。

当我运行表单时，不点击任何地方并键入字符，它将触发两次。例如，如果我输入数字“0”两次，我的事件记录显示：

KeyPress 7/18/2017 2:01:57 PM value: 0
KeyPress 7/18/2017 2:01:57 PM value: 0
KeyPress 7/18/2017 2:01:58 PM value: 0

第一次按键0点火两次。如何禁用或绕过此过程？

Answer 1

显然这是一个已存在一段时间的错误。请检查https://social.msdn.microsoft.com/Forums/windowsapps/en-US/734d6c7a-8da2-48c6-9b3d-fa868b4dfb1d/c-textbox-keydown-triggered-twice-in-metro-applications?forum=winappswithcsharp&forum=winappswithcsharp

在sub的末尾添加e.Handled = true应该可以解决问题

当DataGridView聚焦时，KeyPress在Form上触发两次

1 个答案: