您可以使用LINQ使用标准的自定义谓词来检查列表中是否包含项。在这种情况下，您无需覆盖等于或实现 IEquatable ：

You can check if your list contains an item using a custom predicate for the criteria, using LINQ. In that case you don't need to override Equals nor implement IEquatable:

// check if the list contains an item with a specific ID
bool found = someList.Any(item => item.ID == someId);

覆盖等于（其中 GetHashCode ）和实现 IEquatable 很有用，如果您需要将项目存储在 Dictionary 或 Hashtable 。

Overriding Equals (with GetHashCode) and implementing IEquatable is useful if you need to store your item in a Dictionary or a Hashtable.