转老赵--不同泛型参数生成的具体类（无论是值类型还是引用类型），它们的静态字段是独立的

public static class MyClass<T>
{
    public static readonly Guid Key = Guid.NewGuid();
}

class Program
{
    static void Main(string[] args)
    {
        Console.WriteLine("int: " + MyClass<int>.Key);
        Console.WriteLine("string: " + MyClass<string>.Key);

        Console.ReadLine();
    }
}

public class StaticTest
    {
        public static void Test()
        {
            Console.WriteLine("int:" + MyClass<int>.key);
            Console.WriteLine("string:" + MyClass<string>.key);
        }
        public static void Test2()
        {
            Console.WriteLine("int:" + MyClass2<int>.time);
            System.Threading.Thread.Sleep(3000);
            Console.WriteLine("string:" + MyClass2<string>.time);
        }
        public static void Test3()
        {
            Console.WriteLine("Test3 execute!");

            Console.WriteLine("int:" + MyClass3<int>.time);
            System.Threading.Thread.Sleep(3000);
            Console.WriteLine("string:" + MyClass3<string>.time);
        }
    }
    /// <summary>
    /// 不同泛型参数生成的具体类（无论是值类型还是引用类型），它们的静态字段是独立的
    /// </summary>
    /// <typeparam name="T"></typeparam>
    static class MyClass<T>
    {
        public static readonly Guid key = Guid.NewGuid();
    }
    static class MyClass2<T>
    {
        public static readonly DateTime time = DateTime.Now;
    }
    /// <summary>
    /// 增加一个空的静态构造函数
    /// </summary>
    /// <typeparam name="T"></typeparam>
    static class MyClass3<T>
    {
        public static readonly DateTime time = GetNow();

        private static DateTime GetNow()
        {
            Console.WriteLine("GetNow execute!");
            return DateTime.Now;
        }
        static MyClass3() { }
    }