实例化数组中的对象 [英] Instantiate an object in an array

问题描述

我正在尝试实例化一个新对象并将该对象存储到数组中.我收到对象引用未设置为对象的实例".我无法弄清楚我做错了什么，对我来说看起来很对.任何帮助将不胜感激.

Hi,

I''m trying to Instantiate a new object and store the object into an array. I am receiving "Object reference not set to an instance of an object." I can''t figure out what I''ve done wrong, it looks right to me. Any help is greatly appreciated.

MyExcel[] myexcel = null;
int excel = 0;
...
foreach (KeyValuePair<string, string> kvp in Common.divisionDictionary)
{
    myexcel[excel] = new MyExcel();         // Instantiate an instance of Excel

    path = Common.SpreadsheetDirectory;
    ...
}

我收到以下错误:

I''m receiving the error on:

myexcel[excel] = new MyExcel();

但是，如果我这样分配它，则效果很好:

However if I assign it like this it works perfect:

MyExcel Excel = new MyExcel();

谢谢
Glenn

Thank you,
Glenn

推荐答案

MyExcel[] myexcel = null;

...

myexcel[excel] = new MyExcel();         // Instantiate an instance of Excel

您不能将项目存储到不存在的数组中.您需要为myexcel分配一些条目-至少与foreach循环中遇到的条目一样.

You cannot store an item into an array that does not exist. You need to allocate some entries to myexcel - at least as many as will be encountered in your foreach loop.

您没有为数组分配内存.

例如，从
更改

You didn''t allocate memory for the array.

For instance, changing from

MyExcel[] myexcel = null;

到(说)

to (say)

MyExcel[] myexcel = new MyExcel[10];

会修复您的程序.
:)

would fix your program.
:)

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