C# |在集合末尾添加一个对象

原文:https://www . geeksforgeeks . org/c-sharp-添加一个对象到集合末尾/

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:

https://docs . Microsoft . com/en-us/dotnet/API/system . collections . object model . collection-1 . add？视图=netframework-4.7.2

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