How to use IsNullOrEmpty in VB.NET?
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21-07-2021 - |
سؤال
Why doesn't the following compile in VB.NET?
Dim strTest As String
If (strTest.IsNullOrEmpty) Then
MessageBox.Show("NULL OR EMPTY")
End if
المحلول
IsNullOrEmpty is 'shared' so you should use it that way:
If String.IsNullOrEmpty(strTest) Then
نصائح أخرى
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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