使用String.Format时的异常“索引（从零开始）必须大于或等于零且小于参数列表的大小。” [英] Exception while using String.Format "Index (zero based) must be greater than or equal to zero and less than the size of the argument list."

问题描述

我有一个数组

ArrayList array = new ArrayList();
array.Add("a");
array.Add("b");
array.Add("c");

，我有一个字符串变量 refFormat ，其格式如下。

and I have a string variable refFormat which has the format as below.

string refFormat = "{2} {0}";

我正在尝试使用这种格式从数组中获取一串值。下面是我写的。

I'm trying to get a string of values from the array with this format. Below is what I have written.

string newStr = String.Format(refFormat,array.ToArray());

在尝试执行此操作时遇到以下异常。

I'm getting the following exception when I'm trying to do this.

索引（从零开始）必须大于或等于零且小于参数列表的大小。

Index (zero based) must be greater than or equal to zero and less than the size of the argument list.

我知道这个问题听起来很重复，但是我的疑问是如何从数组中选取值，该值的索引是以 2 格式指定的， 0 。请帮忙。

I know this question sounds repeated but my doubt is how to pick the values from the array whose indexes are the ones specified in the format that 2 and 0. Please help..

编辑：抱歉，您提出了错误的问题。我正在尝试使用arraylist而不是string数组。尽管使用ToArray（）将其转换为数组，我仍然遇到异常。我要去哪里错了？而且我不能在这里使用List而不是arraylist，因为数组包含不同类型的数据。请帮助我。.

Edit: Hi sorry for putting up the wrong question. I'm using an arraylist instead of a string array I'm trying the same. I'm still getting the exception in spite of converting it to an array using ToArray(). Where am I going wrong? And also I cannot use List instead of arraylist here since the array contains data of different type. Please help me out..

推荐答案

作为参考，这也是我的工作代码：

For reference, here is my working code too:

string[] array = new string[] { "a", "b", "c", "d" };

string refFormat = "{2} {0}";

string newStr = String.Format(refFormat, array);

Console.WriteLine(newStr);

运行上面的代码时我没有遇到错误。

I did not encounter an error when running the above code.

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