[Reserved] List collection in C # using the Remove method to remove the specified object

List C # in the set operation is sometimes necessary to remove a particular element of a List object or set of sequences with time it can be set to List Remove method, method Remove method signature bool Remove (T item), item List object representing a particular set, T is a generic form of the expression of C #.

(1) for example, list1 contains a set of List 1 to 10 elements, the elements 5 to be removed with the following statement:

List<int> list1 = new List<int>() { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
list1.Remove(5);

(2) If the reference type is, depending on the need to remove the object and the reference address with the set of elements List object reference addresses match, as follows:

First, define a custom category class TestModel specific structure is as follows

   public class TestModel
    {
         public int Index { set; get; }

        public string Name { set; get; }
    }

Then define a List <TestModel> List of collection, then add two elements to set, after the addition was complete removal element object Index = 1.

  List<TestModel> testList = new List<ConsoleApplication1.TestModel>();
  testList.Add(new ConsoleApplication1.TestModel()
  {
     Index=1,
     Name="Index1"
  });
  testList.Add(new ConsoleApplication1.TestModel()
  {
     Index = 2,
     Name = "Index2"
  });

  var whereRemove = testList.FirstOrDefault(t => t.Index == 1);
  testList.Remove(whereRemove);

After the above statement is executed successfully, testList only one element, the element object only Index = 2. If the above method Remove take the following wording, it will not be removed because although the object of all property values ​​are the same, but the reference to the element at different addresses, not within the List collection.

var whereRemove = new TestModel() { Index = 1, Name = "Index1" };
testList.Remove(whereRemove);

 

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