// C# Extension Method

// Doc: https://csharp-extension.com/en/method/1002724/object-getcustomattributes

​

// @nuget: Z.ExtensionMethods

using System;

public class Program

{

    public static void Main()

    {

        var thisClass = new MyTestClass();

        var thisEnum = MyTestEnum.Test;

​

        //C# Extension Method: Object - GetCustomAttributes             

        var result1 = thisClass.GetCustomAttributes<MyTestAttribute>();

        var result2 = thisClass.GetCustomAttributes<MyTestAttribute>(false);

        var result3 = thisClass.GetType().GetCustomAttributes<MyTestAttribute>();

        var result4 = thisClass.GetType().GetCustomAttributes<MyTestAttribute>(false);

        var result5 = thisClass.GetCustomAttributes();

        var result6 = thisClass.GetCustomAttributes(false);

        var result7 = thisEnum.GetCustomAttributes<MyTestAttribute>();

        var result8 = thisEnum.GetCustomAttributes<MyTestAttribute>(false);

        var result9 = thisEnum.GetCustomAttributes();

        var result10 = thisEnum.GetCustomAttributes(false);

​

        Console.WriteLine(result1[0].Text);

        Console.WriteLine(result2[0].Text);

        Console.WriteLine(result3[0].Text);

        Console.WriteLine(result4[0].Text);

        Console.WriteLine(((MyTestAttribute) result5[0]).Text);

        Console.WriteLine(((MyTestAttribute) result6[0]).Text);

        Console.WriteLine(result7[0].Text);

        Console.WriteLine(result8[0].Text);

        Console.WriteLine(((MyTestAttribute) result9[0]).Text);

        Console.WriteLine(((MyTestAttribute) result10[0]).Text);

    }

}

​

[AttributeUsage(AttributeTargets.All, AllowMultiple = true)]

public class MyTestAttribute : Attribute

{

    public string Text;

​

    public MyTestAttribute(string text)

    {

        Text = text;

    }

}

​

[MyTest("Test Class")]

public class MyTestClass

{

}

​

public enum MyTestEnum

{

    [MyTest("Test Enum")]

    Test

}

​