[C#][VB.NET]擴充方法 (Extension Method)

July 26, 2009

public static class EnumExtension
{
    public static string GetName(this Enum e)
    {
        return Enum.GetName(e.GetType(), e);
    }
}

class Program
{
    static void Main(string[] args)
    {
        Console.WriteLine(Grade.APlus.GetName());
    }
}</pre></div>

Enum Grade APlus A B C D End Enum

Module Module1 Sub Main() Console.WriteLine(Grade.APlus.GetName) End Sub End Module

Module EnumExtension <Extension()> _ Public Function GetName(ByVal e As [Enum]) As String Return [Enum].GetName(e.GetType, e) End Function End Module

class Program
{
    static void Main(string[] args)
    {
        string str = null;
        Console.WriteLine(str.IsNull().ToString());
    }
}</pre></div>

Module Module1

Sub Main()
    Dim str As String = Nothing
    Console.WriteLine(str.IsNull().ToString())
End Sub

End Module

Module StringExtension <Extension()> _ Public Function IsNull(ByVal str As String) As Boolean Return str Is Nothing End Function End Module