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1、比较集合

/// <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);
}

2、比较对象，对象实现IEquatable接口

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