C＃ - 将包含给定数组中所有元素的列表作为字符串返回 [英] C# - return a list containing all the elements in the given array as strings

问题描述

我正在尝试这个问题 - 返回一个List，其中包含给定数组中的所有元素作为字符串，前面是字符串element X ： 。 。 ，其中x =元素的索引。我总觉得我接近正确的代码，但数组，列表和集合的概念仍然是我逐渐习惯的。关于标题中的问题，我试图用for循环来回答它，但是花括号里面会有什么？



我一直得到像这样的错误如果你知道我的意思，这种类型的东西不能转换成这种类型的东西。我想了解如何克服这个障碍。



亲切的问候



我尝试过：

Hi,

I am attempting this question - Return a List containing all the elements in the given array as strings, prepended by the string "element x : ". . , where x = the index of the element. I always feel as if I am close to the right code, but the concept of arrays, lists and collections is something I am still gradually becoming accustomed to. Regarding the question in the title, I have attempted to answer it using a for loop, but what would go inside the curly braces?

I keep getting errors like " "this type of thing" cannot be converted to "this type of thing" ", if you know what I mean. I'd like to understand how to get around that hurdle.

Kind regards

What I have tried:

public static List<string> RetrunModifiedList(DateTime[] anArray)
       {
           for (int i = 0; i < anArray.Length; i++)
               {
             anArray[i] = i.ToString().Prepend("element" i);
               }
           return anArray;

       }

推荐答案

您已声明输入参数 anArray 作为包含DateTime对象的数组 - 但在循环内部，您尝试用字符串填充它。你不能这样做：就像有一个圆孔框架，并试图将方形钉钉入其中！



要返回字符串，你必须创建一个新的包含字符串的集合，并将DateTime对象 - 作为字符串 - 传输到它。

我这样做的方式 - 至少作为初学者 - 将是这样的：

You have declared the input parameter anArray as being an array containing DateTime objects - but inside the loop you attempt to fill it with strings. You can't do that: that's like having a frame of round holes, and trying to fit square pegs into them!

To return strings, you must create a new collection that holds strings, and transfer the DateTime objects - as strings - into it.
The way I would do it - at least as a beginner - would be like this:

public static List<string> RetrunModifiedList(DateTime[] anArray)
   {
   List<string> results = new List<string>();
   for (int i = 0; i < anArray.Length; i++)
      {
      results.Add(string.Format("Element {0} : {1}", i, anArray[i]));
      }
   return results;
   }

看到代码片段后，我可以看到你正在将DateTime []更新为字符串数组。



你能否为此声明单独的变量。



eg.g



List< string> listArray = new List< string>（）;



和for循环内部



listArray.Add（ i.ToString（）。Prepend（elementi））;



并返回listArray对象。



试试这个。

Hi,

After seeing the code snippet, I can see you are updating DateTime[] to string array.

Could you please declare separate variable for this.

eg.g

List<string> listArray= new List<string>();

And inside for loop

listArray.Add(i.ToString().Prepend("element" i));

and return listArray object.

Try this.

public static List<string> RetrunModifiedList(DateTime[] anArray)
       {
             List<string> listArray= new List<string>();

           for (int i = 0; i < anArray.Length; i++)
               {
            listArray.Add(i.ToString().Prepend("element" i));
               }
           return listArray;

       }

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