如何使用c＃将数组添加到第n个位置？ [英] How to add to array to n th position using c#?

问题描述

我有类似的数组

  int  [] marks =  new   int  [ 5 ] { 99 ， 98 ， 95 }; 

这意味着

现在我想在第二个位置插入标记96，e



我试过很多方法的逻辑是什么请帮助



我尝试了什么：

  int  [] marks =  new   int  [ 5 ] { 99 ， 98 ， 95 }; 

表示

int [0] = 99

int [1] = 98

int [2] = 95



现在我想在第2个位置插入标记96，e



int [0] = 99

int [1] = 98

int [2] = 96

int [3] = 95



我试过很多方法的逻辑是什么请帮助

解决方案

你做不到用数组。为此，您可能希望使用列表< T> ：

List(T）类（System.Collections.Generic） [ ^ ]

列表与LT; INT> marks =  new  List< int>（）{ 99 ， 98 ， 95 };  //  初始化包含3个值的列表 
 marks.Insert（ 2 ， 96 ）;  //  在索引'2'处插入值'96' 

在数组中插入有点复杂 - 您必须先将所有较高索引值移开，然后将值保存在数组中。

 [0 == 99] [1 == 98] [2 == 95] [3 ==空] 

 [0 == 99] [1 == 98] [2 == 95] [3 == 95] 

 [0 == 99] [1 == 98] [2 == 96] [3 == 95] 

这很复杂，因为你必须首先确保阵列中有足够的空间，然后从高索引结束工作并手动复制每个值。



而是使用List< int>并且你会发现它有一个Insert方法可以为你完成所有这些：

 List< int> marks =  new  List< int> { 99 ， 98 ， 95 }; 
 marks.Insert（ 2 ， 96 ）; 

i have array like

int [] marks = new int[5]  { 99,  98, 95};

it means
now i want to insert marks 96 in 2rd postion i,e

what is the logic i have tried many ways please help

What I have tried:

int [] marks = new int[5]  { 99,  98, 95};

it means
int[0]=99
int[1]=98
int[2]=95

now i want to insert marks 96 in 2rd postion i,e

int[0]=99
int[1]=98
int[2]=96
int[3]=95

what is the logic i have tried many ways please help

解决方案

You can't do that with an array. For this purpose, you might want to use a List<T>:
List(T) Class (System.Collections.Generic)[^]

List<int> marks = new List<int>() { 99, 98, 95 }; // initialize a list with 3 values
marks.Insert(2, 96); // insert value '96' at index '2'

Inserting in an array is a little complicated - you have to move all the "higher index" values out of the way first and then save the value in the array.

[0 == 99][1 == 98][2 == 95][3 == empty]

[0 == 99][1 == 98][2 == 95][3 == 95]

[0 == 99][1 == 98][2 == 96][3 == 95]

That's complicated, because you have to first make sure there is enough room in the array, then work from the "high index end" and manually copy each value.

Instead, use a List<int> and you'll find it has an Insert method which does all that for you:

List<int> marks = new List<int> { 99,  98, 95};
marks.Insert(2, 96);

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