public static bool ElementaryEqualsThenEquatableEquals <T>(IEquatable <T> obj, object other)
{
return(ElementaryEquals(obj, other)
?? (obj.GetType() != other.GetType()
? false
: obj.Equals((T)other)));
}
/// <summary>
/// 插入一条数据
/// </summary>
/// <param name="entity">实体对象</param>
/// <returns>返回插入的数据数量</returns>
public void Insert(IEquatable <TEntity> entity)
{
lock (DataList)
{
if (DataList.Contains(entity))
{
throw new Exception($"{entity.GetType().Name}内存表中已存在相同数据，插入失败！");
}
DataList.Add(entity);
}
}
// here I try to utilize the Stack class
public void UseStack(Stack stack)
{
// what type should I use for the variable to hold the result of the Stack.Pop method?
type ??? item = stack.Pop();
// if I use IEquatable
IEquatable item1 = stack.Pop();
IEquatable item2 = stack.Pop();
item1.Equals(item2); // then I can do this
Type itemType = item1.GetType(); // but I can't do this
string s = item1.ToString(); // nor can I do this
// Ok, this calls for another interface that composes all of these other interfaces into one
}