// C# Extension Method

// Doc: https://csharp-extension.com/en/method/1002726/object-getcustomattributesbyname

​

// @nuget: Z.ExtensionMethods

using System;

public class Program

{

    public static void Main()

    {

        var thisClass = new MyTestClass();

        var thisEnum = MyTestEnum.Test;

​

        //C# Extension Method: Object - GetCustomAttributesByName               

        var result1 = thisClass.GetCustomAttributesByName("MyTestAttribute");

        var result2 = thisClass.GetCustomAttributesByName("MyTestAttribute", false);

        var result3 = thisClass.GetType().GetCustomAttributesByName("MyTestAttribute");

        var result4 = thisClass.GetType().GetCustomAttributesByName("MyTestAttribute", false);

        var result5 = thisEnum.GetCustomAttributesByName("MyTestAttribute");

        var result6 = thisEnum.GetCustomAttributesByName("MyTestAttribute", false);

​

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

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

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

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

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

        Console.WriteLine(((MyTestAttribute) result6[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

}

​