c#如何计算对象的哈希码？

public class A
{
    public int Field1 { get; set; }
    public string Field2 { get; set; }

    public override int GetHashCode()
    {
        // 如果Field1和Field2的取值不同，那么计算结果为哈希码的一部分
        return Field1.GetHashCode() ^ Field2.GetHashCode();
    }
}

[AttributeUsage(AttributeTargets.Class)]
public class MyInterfaceAttribute : Attribute
{
    public string InterfaceName { get; }

    public MyInterfaceAttribute(string interfaceName)
    {
        InterfaceName = interfaceName;
    }
}

[MyInterface("SomeInterface")]
public interface IMyInterface<T> where T : System.IComparable
{
    T Sum()
    {
        int x = 0, y = 0;
        foreach (var item in this)
        {
            x += (item as T);
            y++;
        }
        return x > 0 ? (T)(double)x / y : default(T);
    }

    System.IStructuralEquatable IMyInterface<T>.Equals(object obj, System.IEqualityComparer comparer)
    {
        if (obj == null) return false;
        return type.Equals(obj.GetType(), comparer);
    }
    
    System.IComparer IMyInterface<T>.CompareTo(object obj)
    {
        if (obj == null) return 1;
        if (!(obj is T)) throw new ArgumentException("Type mismatch");
        T current = obj as T;
        T other = current;
        for (int i = 0; i< type.GetPropertyCount(); i++)
        {
            PropertyInfo pinfo = type.GetProperty(type.GetPropertyName(i));
            other = pinfo.GetValue(current);
            current = pinfo.GetValue(obj);
        }
        return other.CompareTo(current);
    }
    
    private System.Type type;
    
    public IMyInterface(Type type)
    {
        this.type = type;
    }
}

class MyClass : SomeInterfaceImplementingIMyInterface<int>, SomeOtherInterfaceImplementingIMyInterface<decimal>
{
    private static MyClass Default { get; } = new MyClass(30);

    public override int GetHashCode()
    {
        // 区分两个不同对象，这里只提取一个属性作为区分依据
        return Default.InterfaceImplementingIMyInterfaceAttribute.InterfaceName[0].ToString().GetHashCode(System.NumberStyles.Integer);
    }
}