Usage examples of list in C#

Let me give you an example first:

Create a winform solution in vs2010, and then define a class Person. The code of Person.cs is as follows:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace test
{
    public class Person
    {
        public string Name { get; set; }
        public int Age { get; set; }
        public string six { get; set; }
        public DateTime Birthday { get; set; }
    }
}

(move the mouse over the code, four will appear at the top of the code icon, the first one is to view the source code, the second one is to copy the code, the third one is to print the code, and the fourth one is help)
Then drag in a button, double-click the button, and add the code inside:

List<Person> list = new List<Person>();
Person person = null;
for (int i = 0; i < 10; i++)
{
    person = new Person();
    person.Name = string.Format("xxxx{0}", i);
    person.Age = 20 + i;
    person.Birthday = DateTime.Now.AddDays(i);
    person.six = i % 2 == 0 ? "女" : "男";
    list.Add(person);
}
string serialStr = JsonConvert.SerializeObject(list);
List<Person> listperson = new List<Person>();
listperson = JsonConvert.DeserializeObject<List<Person>>(serialStr);
for (int i = 0; i < listperson.Count; i++)
{
    MessageBox.Show(listperson[i].Name);
}

(Move the mouse over the code, and four icons will appear at the top of the code. The first is to view the source code, the second is to copy the code, the third is to print the code, and the fourth is help)

The above is A simple usage example of List.

C# ListUsage

Namespace: using System.Collections.Generic;

List class is the generic equivalent of ArrayList class class. This class implements the IList generic interface using an array whose size can be dynamically increased as needed.

Benefits of generics: It adds great power and flexibility to writing object-oriented programs using the C# language. There is no forced boxing and unboxing of value types, or downcasting of reference types, so performance is improved.

1. Basic and commonly used methods of List:

1. List mList = new List();

a.T is the element type in the list, now take the string type as an example

For example: List mList = new List();

b. Add element: List. Add(T item) Add an element

For example: mList.Add("Lai Yanbin") ;

c. Insert element: Insert(int index, T item); Add an element at index position

For example: mList.Insert(1, "laiyanbin");

d. Delete element : List. Remove (T ITEM) Delete a value. For example: mlist.remove ("Lai Yanbin");

List. Removeat (int index); .：mList.RemoveAt(0);

                  List. RemoveRange(int index, int count); Starting from the subscript index, delete count elements

                                                  use     use     use     use       use using ’ s through out  ‐     ‐ ‐ ‐ ‐ ‐ ‐ ‐ List.RemoveRange(int index, int count);                                                                          / An error will occur if it exceeds the scope of deletion

Note: After an element is deleted, the subscript of the element behind it will automatically follow

e. Determine whether there is a List: List. Contains(T item) The result is to return true Or false

f. Sort: List. Sort () //The default is the first letter of the element in ascending order

                                                                                                                                                                               Can Use with List.Sort () to achieve the desired effect

        Traversing the elements in the List:                                      Console.WriteLine( element);

                                                                                                                                                                                          Number of elements:

        List. Count ( ) Return int value

i. Add array into List:string[] temArr = { Ha","Hunter", "Tom", "Lily", "Jay", "Jim", "Kuku", " "Locu" };

                   mList.AddRange(temArr);

E.g.: string[] temArr = { "Ha", "Hunter", "Tom", "Lily", "Jay", "Jim", "Kuku", "Locu" };

                List testList = new List(temArr);

3. Mutual conversion between List and array

1. Convert from string[] to List

For example: string[] str={"1"," 2"};

List list=new List(str);

2. From List to string[]

For example: List list=new List;

String[] str=list.ToArray();

/ /ViewState["idlist"] is converted into List<>

List idlist=(List)ViewState["idlist"]

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