Linq 等式运算符：SequenceEqual-白红宇

Linq 等式运算符：SequenceEqual

阅读量：4631 次

发布时间：2019-06-09

本文共 1783 字，大约阅读时间需要 5 分钟。

检查元素的数量，每个元素的值及两个集合中元素的顺序是否相等,3个方面都相等则为true,否则为false

IList
     
       strList1 = new List
      
       (){
   "One", "Two", "Three", "Four", "Three"}; IList
       
         strList2 = new List
        
         (){
   "One", "Two", "Three", "Four", "Three"}; bool isEqual = strList1.SequenceEqual(strList2); // returns trueIList
         
           strList1 = new List
          
           (){ "One", "Two", "Three", "Four", "Three"}; IList
           
             strList2 = new List
            
             (){ "Two", "One", "Three", "Four", "Three"}; bool isEqual = strList1.SequenceEqual(strList2); // returns false//如果是引用类型,则比较的是引用Student std = new Student() { StudentID = 1, StudentName = "Bill" }; IList
             
               studentList1 = new List
              
               (){ std }; IList
               
                 studentList2 = new List
                
                 (){ std }; bool isEqual = studentList1.SequenceEqual(studentList2); // returns true Student std1 = new Student() { StudentID = 1, StudentName = "Bill" };Student std2 = new Student() { StudentID = 1, StudentName = "Bill" }; IList
                 
                   studentList3 = new List
                  
                   (){ std1}; IList
                   
                     studentList4 = new List
                    
                     (){ std2 }; isEqual = studentList3.SequenceEqual(studentList4);// returns false//在上面的示例中，studentList1和studentList2包含相同的学生对象std。 所以studentList1.SequenceEqual（studentList2）返回true。 但是，stdList1和stdList2包含两个独立的学生对象std1和std2。 //所以现在，stdList1.SequenceEqual（stdList2）将返回false.//要比较复杂类型的两个集合的值，您需要实现IEqualityComperar 
                     
                      接口，如下所示class StudentComparer : IEqualityComparer
                      
                       { public bool Equals(Student x, Student y) { if (x.StudentID == y.StudentID && x.StudentName.ToLower() == y.StudentName.ToLower()) return true; return false; } public int GetHashCode(Student obj) { return obj.GetHashCode(); }}// following returns truebool isEqual = studentList1.SequenceEqual(studentList2, new StudentComparer());