(C#) FileInfo 数组越界异常...除非它不是

发布于 2024-08-15 14:16:36 字数 628 浏览 2 评论 0 原文

代码：

DirectoryInfo[] d2 = new DirectoryInfo[400];
d2 = moreDirect.GetDirectories();
//Declaring FileInfo array
FileInfo[] f = new FileInfo[300];
f = d2[z].GetFiles();
if (d2[z].Exists)

{  
    if (f[y] != null)
    {
     ...
     //FileInfo does it stuff and somewhere it does ++y depending on the situation blahblahblah

         if (f[y] == null) <-------- Right here is where it does it!  And y only equals 1 here.  I checked.
         {
              y = 0;
              fileTime = false;
              break;
         }

那么，有人知道出了什么问题吗？我绞尽脑汁了。我用谷歌搜索过，我搜索过堆栈溢出。这一定是一些愚蠢的事情。我不知道。

原文

Code:

DirectoryInfo[] d2 = new DirectoryInfo[400];
d2 = moreDirect.GetDirectories();
//Declaring FileInfo array
FileInfo[] f = new FileInfo[300];
f = d2[z].GetFiles();
if (d2[z].Exists)

{  
    if (f[y] != null)
    {
     ...
     //FileInfo does it stuff and somewhere it does ++y depending on the situation blahblahblah

         if (f[y] == null) <-------- Right here is where it does it!  And y only equals 1 here.  I checked.
         {
              y = 0;
              fileTime = false;
              break;
         }

So, does anyone know what is going wrong? I have racked my brain. I have googled, I have stack overflow searched. It has to be something silly. I have no idea.

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浅笑依然 2024-08-22 14:16:36

GetFiles() 返回一个新数组。之前将 f 声明为大小为 300 的数组并不重要，当 GetFiles 返回时，它会使用新数组重新分配 f，而旧的大小为 300 的数组会丢失。

FileInfo[] f = new FileInfo[300];  //<-- Creates a array of size 300.
f = d2[z].GetFiles();              //<-- replaces f with a new array. This array will contain just enough space for the number of files found.

实际上，您根本不需要创建数组，只需这样做即可。

FileIndo[] f = d2[z].GetFiles();

当您需要访问它时，您应该首先检查数组长度或使用 for/foreach 循环来迭代数组中的每个项目。

GetFiles() returns a new array. It doesn't matter that you declared f to be an array of size 300 just before, when GetFiles returns it reassigns f with the new array and the old size 300 one is lost.

FileInfo[] f = new FileInfo[300];  //<-- Creates a array of size 300.
f = d2[z].GetFiles();              //<-- replaces f with a new array. This array will contain just enough space for the number of files found.

You actually don't need to create the array at all, you can just do this.

FileIndo[] f = d2[z].GetFiles();

When you need to access it you should check the arrays length first or use a for/foreach loop to iterate over each item in the array.

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二智少女猫性小仙女 2024-08-22 14:16:36

FileInfo[] f = new FileInfo[300];
f = d2[z].GetFiles();

您正在将另一个数组重新分配给您的 f 变量。 d2[z].GetFiles(); 返回的数组中只有一个元素可能会导致您的问题（第一个 if 条件中 y == 0 并且 y = = 1 在第二个）。

FileInfo[] f = new FileInfo[300];
f = d2[z].GetFiles();

You are reassigning another array to your f variable. Having just one element in the array returned by d2[z].GetFiles();, may cause your problem (y == 0 in the first if condition and y == 1 in the second).