如何在vb.net中从类的所有成员中找到空值

Question

我有第三方对象，其中包含如此多的成员，包含整数，字符串和布尔值。我想更新其值不为空或空白的记录

Answer 1

您可以使用反射来实现您想要的效果：

Sub Main()
    Dim obj As Test = new Test()

    Dim type As Type = GetType(Test)
    Dim info As PropertyInfo() = type.GetProperties()
    For Each propertyInfo As PropertyInfo In info
        Dim value As String = propertyInfo.GetValue(obj)
        If propertyInfo.PropertyType = GetType(String) And String.IsNullOrEmpty(value)
            ' empty value for this string property
        End If
    Next
End Sub

public Class Test
    Public Property Test As String
End Class