How to use IsNullOrEmpty in VB.NET?
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21-07-2021 - |
题
Why doesn't the following compile in VB.NET?
Dim strTest As String
If (strTest.IsNullOrEmpty) Then
MessageBox.Show("NULL OR EMPTY")
End if
解决方案
IsNullOrEmpty is 'shared' so you should use it that way:
If String.IsNullOrEmpty(strTest) Then
其他提示
You can actually just compare to an empty string:
If strTest = "" Then
MessageBox.Show("NULL OR EMPTY")
End If
String.IsNullOrEmpty is a shared (or static, in C#) method.
Dim strTest As String
If (String.IsNullOrEmpty(strTest)) Then
MessageBox.Show("NULL OR EMPTY")
End if
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