检查屏蔽文本框是否为空 VB.NET
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/14233905/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Check Masked Text Box is empty or not VB.NET
提问by Thanzeem
I have Masked Text Boxes in my form. One is for salary, PF&ESI and Other is for Phone Number. I try to check the Masked Text Box is empty or not with following code.
我的表单中有蒙版文本框。一个是薪水，PF&ESI，其他是电话号码。我尝试使用以下代码检查屏蔽文本框是否为空。
Dim mtxt As Control
Dim flag3 As Boolean
flag3 = False
For Each mtxt In EMPGBDATA.Controls
If TypeOf mtxt Is MaskedTextBox Then
If mtxt.Text = "" Then
mtxt.BackColor = Color.Red
flag3 = True
End If
End If
Next
Only my salary, PF&ESI Masked Text Box show in Red color, But Phone number Masked Text Box is not show Red.
只有我的薪水，PF&ESI 掩码文本框显示为红色，但电话号码掩码文本框不显示为红色。
回答by Steve
I think you have the following situation: (Probably defined by the property designer)
我认为你有以下情况：（可能是属性设计者定义的）
maskedTextBoxPhoneNumber.Mask = "000000 00000" 'Or something similar'
maskedTextBoxPhoneNumber.TextMaskFormat = MaskFormat.IncludeLiterals
in this case your test for
在这种情况下，您的测试
if mtxt.Text = "" then
will fail because the literals included in the mask property are returned in the property Text
将失败，因为包含在掩码属性中的文字在属性中返回 Text
you should change the property TextMaskFormatto
您应该将属性更改TextMaskFormat为
maskedTextBoxPhoneNumber.TextMaskFormat = MaskFormat.ExcludePromptAndLiterals
