textchanged事件上的自定义ASP.NET文本框

我想让TextBox控件TextChanged事件仅在TextBox中有多个字符时触发

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谢谢。

我认为您需要一个自定义控件，该控件通过自定义事件继承textbox控件，在内部事件中进行检查，并在您认为合适时触发自定义事件

Public Class ZTextBox
Inherits System.Windows.Forms.TextBox
Public Event ZTextChanged(ByVal sender As Object, ByVal e As System.EventArgs)

Protected Overrides Sub OnPaint(ByVal e As System.Windows.Forms.PaintEventArgs)
    MyBase.OnPaint(e)

    'Add your custom paint code here
End Sub

Private Sub ZTextBox_TextChanged1(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.TextChanged
    If Me.Text.Length > 3 Then
        RaiseEvent ZTextChanged(sender, e)
    End If
End Sub End Class

您可以在表单中使用以下内容

    Private Sub ZTextBox1_ZTextChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ZTextBox1.ZTextChanged
    MsgBox(1)
End Sub