C# |在集合末尾添加一个对象
收藏。Add(T) 方法用于将一个对象添加到集合的末尾< T** >。
语法:
public void Add (T item);
这里 项 是要添加到集合< T >末尾的对象。对于引用类型,该值可以为 null。
下面给出了一些例子,以便更好地理解实现:
例 1:
// C# code to add an object to
// the end of the Collection
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
class GFG {
// Driver code
public static void Main()
{
// Creating a collection of strings
Collection<string> myColl = new Collection<string>();
myColl.Add("A");
myColl.Add("B");
myColl.Add("C");
myColl.Add("D");
myColl.Add("E");
// Displaying the number of elements in Collection
Console.WriteLine("The number of elements in myColl are : "
+ myColl.Count);
// Displaying the elements in Collection
Console.WriteLine("The elements in myColl are : ");
foreach(string str in myColl)
{
Console.WriteLine(str);
}
}
}
输出:
The number of elements in myColl are : 5
The elements in myColl are :
A
B
C
D
E
例 2:
// C# code to add an object to
// the end of the Collection
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
class GFG {
// Driver code
public static void Main()
{
// Creating a collection of ints
Collection<int> myColl = new Collection<int>();
myColl.Add(2);
myColl.Add(3);
myColl.Add(4);
myColl.Add(5);
// Displaying the number of elements in Collection
Console.WriteLine("The number of elements in myColl are : "
+ myColl.Count);
// Displaying the elements in Collection
Console.WriteLine("The elements in myColl are : ");
foreach(int i in myColl)
{
Console.WriteLine(i);
}
}
}
输出:
The number of elements in myColl are : 4
The elements in myColl are :
2
3
4
5
注:
- 集合< T >接受 null 作为引用类型的有效值,并允许重复元素。
- 这个方法是一个 O(1) 运算。
参考:
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