向C#数组添加元素 [英] Adding elements to a C# array

问题描述

我想以编程方式在C#中向字符串数组添加或删除一些元素，但仍保留以前的内容，有点像VB函数

I would like to programmatically add or remove some elements to a string array in C#, but still keeping the items I had before, a bit like the VB function ReDim Preserve.

推荐答案

显而易见的建议是改用 List< string> ，您将从其他答案中已经读过.这绝对是实际开发场景中的最佳方法.

The obvious suggestion would be to use a List<string> instead, which you will have already read from the other answers. This is definitely the best way in a real development scenario.

当然，我想让事情变得更有趣(就是我今天)，所以我将直接回答您的问题.

Of course, I want to make things more interesting (my day that is), so I will answer your question directly.

以下是几个函数，这些函数将从 string [] ...

Here are a couple of functions that will Add and Remove elements from a string[]...

string[] Add(string[] array, string newValue){
    int newLength = array.Length + 1;

    string[] result = new string[newLength];

    for(int i = 0; i < array.Length; i++)
        result[i] = array[i];

    result[newLength -1] = newValue;

    return result;
}

string[] RemoveAt(string[] array, int index){
    int newLength = array.Length - 1;

    if(newLength < 1)
    {
        return array;//probably want to do some better logic for removing the last element
    }

    //this would also be a good time to check for "index out of bounds" and throw an exception or handle some other way

    string[] result = new string[newLength];
    int newCounter = 0;
    for(int i = 0; i < array.Length; i++)
    {
        if(i == index)//it is assumed at this point i will match index once only
        {
            continue;
        }
        result[newCounter] = array[i];
        newCounter++;
    }  

    return result;
}

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