How to use List in C#? Summary of basic usage of List

　What about List in C#? The List8742468051c85b06f0a0af9e3e506b5c class is the generic equivalent of the ArrayList class, which implements the IList8742468051c85b06f0a0af9e3e506b5c generic interface using an array whose size can be dynamically increased as needed. Next, the editor will introduce some basic and simple usage of List.

Benefits of generics: It adds great efficiency 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.

Performance Note: When deciding to use IList8742468051c85b06f0a0af9e3e506b5c or the ArrayList class (both have similar functionality), remember that the IList8742468051c85b06f0a0af9e3e506b5c class performs better in most cases and is type-safe. If you use a reference type for type T of the IList8742468051c85b06f0a0af9e3e506b5c class, the behavior of the two classes is exactly the same. However, if you use a value type for type T, you need to consider implementation and boxing issues.

Basic common methods of C# List:

1. Statement:

1. List8742468051c85b06f0a0af9e3e506b5c mList = new List8742468051c85b06f0a0af9e3e506b5c();

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

　 List98c455a79ddfebb79781bff588e7b37e mList = new List98c455a79ddfebb79781bff588e7b37e();

　 2. List8742468051c85b06f0a0af9e3e506b5c testList =new List8742468051c85b06f0a0af9e3e506b5c (IEnumerable8742468051c85b06f0a0af9e3e506b5c collection);

Create a List with a collection as a parameter ：

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

　 List98c455a79ddfebb79781bff588e7b37e testList = new List98c455a79ddfebb79781bff588e7b37e(temArr);

　　2. Add elements:

　1. List. Add(T item) Add an element

　Example:

　mList.Add("John");

　2 , List. AddRange(IEnumerable8742468051c85b06f0a0af9e3e506b5c collection) adds a set of elements

Example:

　string[] temArr = {"Ha","Hunter","Tom","Lily","Jay","Jim" ,"Kuku","Locu"};mList.AddRange(temArr);

　3. Insert(intindex, T item); Add an element at the index position

　Example:

　mList.Insert(1,"Hei ");

3. Traverse the elements in the List:

　　foreach(TelementinmList)T的类型与mList声明时一样
　　{
　　Console.WriteLine(element);
　　}
　　例：
　　foreach(stringsinmList)
　　{
　　Console.WriteLine(s);
　　}

4. Delete elements:

1. List. Remove(T item) deletes a value

Example:

mList.Remove("Hunter ");

　 2. List. RemoveAt(intindex); Delete the element whose subscript is index

　 Example:

　 mList.RemoveAt(0);

3. List. RemoveRange(intindex,intcount);

Starting from the subscript index, delete count elements

Example:

mList.RemoveRange(3, 2);

5. Determine whether an element is in the List:

List. Contains(T item) Return true or false, very practical

Example:

　　if(mList.Contains("Hunter"))
　　{
　　Console.WriteLine("There is Hunter in the list");
　　}
　　else
　　{
　　mList.Add("Hunter");
　　Console.WriteLine("Add Hunter successfully.");
　　}

6. Sort the elements in the List:

List. Sort () defaults to the first letter of the element in ascending order

Example:

mList.Sort ();

7. Reverse the order of elements in List:

List. Reverse () can be used in conjunction with List. Sort () to achieve the desired effect

Example:

mList.Sort();

8. Clear the List:

List. Clear ()

Example:

mList.Clear(); Example:
N in tcount = mlist.count ();

console.writeline ("the num of elements in the list:"+count); You guys are helpful.

For more information on how to use List in C#? For related articles on the summary of basic usage of List, please pay attention to the PHP Chinese website!