Implementation of iequalitycomparer interface in C ＃

In use linq When writing code, , The function of weight removal may be used . If only string The type is OK , You can use the following code to de duplicate ：

var testList = (from r in realresultList select r).Distinct<string>().toList<string>();

But if realresultList Contains classes , You need to process the class . That's where we use IEqualityComparer Interface .
The specific implementation is as follows ：
1、 First define your own model

	public class QueryCommentModel
    {
    
        public string NurseStation {
     get; set; }
        public string DeptID {
     get; set; }
        public string DeptName {
     get; set; }
        public string PharmacistID {
     get; set; }
        public string PharmacistName {
     get; set; }
        public string OrderCount {
     get; set; }
        public string RightCommentStatus {
     get; set; }
        public string ErrorCommentStatus {
     get; set; }
    }

2、 Implementation interface

	public class QueryCommentModelComparer : IEqualityComparer<QueryCommentModel>
    {
    
        // Implement specific comparison logic （ Related to the actual business ）
        public bool Equals(QueryCommentModel x, QueryCommentModel y)
        {
    
            bool checkFlag = true;

            if (Object.ReferenceEquals(x, y))
            {
    
                checkFlag = true;
            }
            else if (Object.ReferenceEquals(x, null) || Object.ReferenceEquals(y, null))
            {
    
                checkFlag = false;
            }
            else
            {
    
                if (x.NurseStation == y.NurseStation && x.DeptID == y.DeptID && x.PharmacistID == y.PharmacistID)
                {
    
                    checkFlag = true;
                }
                else
                {
    
                    checkFlag = false;
                }
            }

            return checkFlag;
        }

        // Get the hash value 
        public int GetHashCode(QueryCommentModel model)
        {
    
            if (Object.ReferenceEquals(model, null)) return 0;

            int hashNurse = model.NurseStation.GetHashCode();
            int hashDeptID = model.DeptID.GetHashCode();
            int hashPharmacist = model.PharmacistID.GetHashCode();
            return hashNurse ^ hashDeptID ^ hashPharmacist;
        }
    }

3、 Implement... In business code

// Through the comparator , De duplication of implementation classes 
var testList = (from r in realresultList select r).Distinct<QueryCommentModel>(new QueryCommentModelComparer()).ToList<QueryCommentModel>();