当TextBox达到最大长度时显示MessageBox [英] Showing MessageBox when TextBox reaches max length

问题描述

大家好

我正在尝试在用户达到TextBox的最大长度时显示MessageBox

< TextBox1 KeyDown =" OnKeyDownHandler" /> 

 Private Sub OnKeyDownHandler（sender As Object，e As KeyEventArgs）
 If（TextBox1.Text .Length> = 6）然后
 MessageBox.Show（" Max characters reach："，" Get it"，MessageBoxButton.YesNoCancel，MessageBoxImage.Warning）
 End if 
 
 End Sub 

输入最后一个字符时，我同时收到消息，TextBox只显示前6个字符。如何在TextBox中获取消息并显示所有输入的字符？

谢谢

解决方案

您好    zleug，



>>我收到同样的消息键入最后一个字符的时间和TextBox仅显示前6个字符。如何在TextBox中获取消息并显示所有输入的字符？



您可以使用 Textboxkey1_PreviewKeyUp 事件显示所有输入的字符并显示消息。

< TextBox x：Name =" textboxkey1" PreviewKeyUp = QUOT; Textboxkey1_PreviewKeyUp"余量= QUOT; 0,0,0,378" /> 
 
 

 Private Sub Textboxkey1_PreviewKeyUp（sender As Object，e As KeyEventArgs）
 If（textboxkey1.Text.Length > = 6）然后
 MessageBox.Show（" Max characters reach："，" Get it"，MessageBoxButton.YesNoCancel，MessageBoxImage.Warning）
 End if 
 End Sub 

Best Regards



Yong Lu

Hi All

I'm trying to have a MessageBox appear when a user reaches the max length of TextBox

<TextBox1 KeyDown="OnKeyDownHandler" />

Private Sub OnKeyDownHandler(sender As Object, e As KeyEventArgs)
    If (TextBox1.Text.Length >= 6) Then
            MessageBox.Show("Max character reached: ", "Get it", MessageBoxButton.YesNoCancel, MessageBoxImage.Warning)
    End If

End Sub

I'm getting message at the same time when typed last character and TextBox display only first 6 characters. How to get message and display in TextBox all entered characters?

Thanks

解决方案

Hi   zleug,

>>I'm getting message at the same time when typed last character and TextBox display only first 6 characters. How to get message and display in TextBox all entered characters?

You can use the Textboxkey1_PreviewKeyUp event show all entered characters and display the message.

<TextBox x:Name="textboxkey1"  PreviewKeyUp="Textboxkey1_PreviewKeyUp" Margin="0,0,0,378" />

Private Sub Textboxkey1_PreviewKeyUp(sender As Object, e As KeyEventArgs)
		If (textboxkey1.Text.Length >= 6) Then
			MessageBox.Show("Max character reached: ", "Get it", MessageBoxButton.YesNoCancel, MessageBoxImage.Warning)
		End If
	End Sub

Best Regards

Yong Lu

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