使用C#结构作为字典键的最佳方式是什么？

public struct MyStruct : IEquatable<MyStruct>
{
    public int Field1;
    public string Field2;

    public bool Equals(MyStruct other)
    {
        return Field1 == other.Field1 && Field2 == other.Field2;
    }

    public override bool Equals(object obj)
    {
        if (obj is MyStruct)
        {
            return Equals((MyStruct)obj);
        }
        return false;
    }

    public override int GetHashCode()
    {
        int hash = 17;
        hash = hash * 23 + Field1.GetHashCode();
        hash = hash * 23 + (Field2 != null ? Field2.GetHashCode() : 0);
        return hash;
    }
}

// 使用结构作为字典键
Dictionary<MyStruct, string> dict = new Dictionary<MyStruct, string>();

MyStruct key1 = new MyStruct { Field1 = 1, Field2 = "A" };
MyStruct key2 = new MyStruct { Field1 = 2, Field2 = "B" };

dict.Add(key1, "Value1");
dict.Add(key2, "Value2");

string value1 = dict[key1]; // 获取键为key1的值