C#中没有OfType，如何获取具体的自定义属性？

using System;
using System.Linq;

public class CustomAttribute : Attribute
{
    public string Name { get; set; }
}

[Custom(Name = "Attribute 1")]
public class MyClass1
{
    // ...
}

[Custom(Name = "Attribute 2")]
public class MyClass2
{
    // ...
}

public class Program
{
    public static void Main()
    {
        Type type = typeof(MyClass1);

        var customAttributes = type.GetCustomAttributes(typeof(CustomAttribute), true)
                                   .OfType<CustomAttribute>()
                                   .Where(attr => attr.Name == "Attribute 1");

        foreach (var attribute in customAttributes)
        {
            Console.WriteLine(attribute.Name);
        }
    }
}