asp.net - VB.net 文本框返回 hit(enter) 事件

Question

如何在 TextBox 上捕获返回命中（输入）？

以下不起作用。我不断收到错误“找不到 KeyPress 事件”。

Private Sub TextBox_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox.KeyPress
        If TextBox.Text Is Nothing Then Return
        If TextBox.Text.Length = 6 And Asc(e.KeyChar) = 13 Then
            ' Do something here
        End If

End Sub

Answer 1

尝试删除文本框并重新输入代码

If TextBox.Text Is Nothing Then Return
    If TextBox.Text.Length = 6 And Asc(e.KeyChar) = 13 Then
        ' Do something here
    End If

因为这应该可以工作 - 您很可能对文本框名称或按键声明代码搞砸了。

我刚刚在一个新的文本框中检查了该代码，它运行良好。

Answer 2

以下代码确实有效：

Private Sub TextBox_KeyPress(ByVal KeyAscii As Integer)

        If TextBox.Text Is Nothing Then Return
        If TextBox.Text.Length = 6 And KeyAscii = 13 Then
            ' Do something here
        End If

End Sub

Answer 3

Private Sub TextBox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress
    If e.KeyChar = Convert.ToChar(13) Then
        If TextBox1.Text.Trim <> Nothing Then
            'Do Something here
        End If
    End If