无法使用C#将索引与[]应用于类型'System.Array'的表达式 [英] Cannot apply indexing with [] to an expression of type 'System.Array' with C#

问题描述

我正在尝试使用包含C#中的字符串数组的列表，但我不知道如何正确格式化我的声明.

I'm trying to use a List containing string arrays in C# but I don't know how to format my declaration properly.

private String encrypt(char[] text)
{
    Random rnd = new Random();
    string[] encrypted = new string[text.Length];

    for (int i = 0; i < text.Length; i++)
    {
        int symnumb = rnd.Next(listmin, listmax);
        encrypted[i] = alphabet[getnumber(text[i])][symnumb].ToString(); 
    }
    return string.Join("", encrypted);
}

这是更深层次的:

private int getnumber(char letter)
{
    for (int i = 0; i < 27; i++)
    {
        if (letter == alphabetc[i])
        {
            return i;
        }
    }
    return -1;
}

我必须发布许多无关的代码，但是已加密"是字符串数组，字母"是包含字符串的数组列表.

I have to much irrelevant code to post it all, but "encrypted" is a string array, "alphabet" is a list of arrays containing strings.

声明:

public List<Array> alphabet = new List<Array>();
public char[] alphabetc = new char[]{'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', ' '};

任何帮助都会很棒.

推荐答案

错误非常简单；您不能在Array上使用索引器. Array类是所有数组类型的基类，并且数组是隐式继承自Array.但是，Array本身没有索引器.这是您的错误的证明:

The Error is pretty straightforward; you can't use an indexer on an Array. Array class is a base class for all array types, and arrays are implicitly inherit from Array. But, Array itself doesn't have an indexer. Here is a demonstration of your error:

int[] numbers = new[] {1, 2, 3, 4, 5};

numbers[2] = 11; // Okay

Array arr = numbers as Array;

arr[2] = 11; // ERROR!

因此，如果要使用索引器，请将元素类型更改为某些数组，例如:

So if you want to use the indexer, change your element type to an array of something for example:

public List<string[]> alphabet = new List<string[]>();

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