C# 比较两个集合和比较对象

/// <summary>
/// 比较两个集合
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="list1"></param>
/// <param name="list2"></param>
/// <returns></returns>
public static bool EqualList<T>(this List<T> list1, List<T> list2)
{
    return list1 == null && list2 == null || list1 != null && list1.SequenceEqual(list2);
}

public class Model: IEquatable<Model>
{
    public int Id { get; set; }

    public string Name { get; set; }

    public List<string> List { get; set; }

    public bool Equals(Model obj)
    {
        //this非空，obj如果为空，则返回false
        if (ReferenceEquals(null, obj)) return false;

        //如果为同一对象，必然相等
        if (ReferenceEquals(this, obj)) return true;

        //如果类型不同，则必然不相等
        if (obj.GetType() != GetType()) return false;

        //对比各个字段值
        if (!Equals(Id, obj.Id) || !Equals(Name, obj.Name) || !List.EqualList(obj.List))
            return false;

        //如果基类不是从Object继承，需要调用base.Equals(other)
        //如果从Object继承，直接返回true
        return true;
    }

    public override int GetHashCode()
    {
        return StringComparer.InvariantCulture.GetHashCode(Id);
    }
}