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Generic List < T > Contains is a method that compares whether a list already contains an object < T > Today I searched 1 usage on the Internet write it down for future reference.

To compare our custom objects in this way, we first need a comparator,

Note that the comparator here is implementation IEqualityComparer < T > For interfaces, don't write IComparer < T > .

As follows:

    /// <summary>
    ///  tracing      The: popup model object list comparator ( According to the ID To compare )
    /// </summary>
    public class PopupComparer : IEqualityComparer<Model.PopupModel.PopupModel>
    {
        public static PopupComparer Default = new PopupComparer();
        #region IEqualityComparer<PopupModel>  Members of the 
        public bool Equals(Model.PopupModel.PopupModel x, Model.PopupModel.PopupModel y)
        {
            return x.Id.Equals(y.Id);
        }
        public int GetHashCode(Model.PopupModel.PopupModel obj)
        {
            return obj.GetHashCode();
        }
        #endregion
    }

Then we can call Contains < T > () The method is as follows:

List<PopupModel> list = new List<PopupModel>();
//model Is the object to be compared 
if(list.Contains<PopupModel>(model,PopupComparer.Default))
{
}