我哪里做错了？执行时出错（运行时错误）答案

【问题标题】：Where I did something wrong? error while execution (runtime error)我哪里做错了？执行时出错（运行时错误）
【发布时间】：2015-08-05 09:14:06
【问题描述】：

我做错了什么；我收到一个错误：在这一行：

Buffer.BlockCopy((Array) numArray, icondirentry.ImageOffset, (Array)
                 iconFile.iconImage[index], 0, icondirentry.BytesInRes);

错误：数组的偏移量和长度超出范围，或者计数大于从索引到源集合末尾的元素数。

该方法的完整代码为：

 public static IconClass.IconFile FromFile(string filename)
      {
        IconClass.IconFile iconFile = new IconClass.IconFile();
        byte[] numArray = File.ReadAllBytes(filename);
        GCHandle gcHandle = GCHandle.Alloc((object) numArray, GCHandleType.Pinned);
        iconFile.iconDir = (IconClass.ICONDIR) Marshal.PtrToStructure(gcHandle.AddrOfPinnedObject(), typeof (IconClass.ICONDIR));
        iconFile.iconEntry = new IconClass.ICONDIRENTRY[checked ((int) iconFile.iconDir.Count - 1 )];
        iconFile.iconImage = new byte[checked ((int) iconFile.iconDir.Count - 1)][];
        int num1 = Marshal.SizeOf((object) iconFile.iconDir);
        Type type = typeof (IconClass.ICONDIRENTRY);
        int num2 = Marshal.SizeOf(type);
        int num3 = 0;
        int num4 = checked ((int) iconFile.iconDir.Count - 1);
        int index = num3;
        while (index <= num4)
        {
          IconClass.ICONDIRENTRY icondirentry = (IconClass.ICONDIRENTRY) Marshal.PtrToStructure(new IntPtr(checked (gcHandle.AddrOfPinnedObject().ToInt64() + (long) num1)), type);
          iconFile.iconEntry[index] = icondirentry;
          iconFile.iconImage[index] = new byte[checked (icondirentry.BytesInRes - 1 )];
          Buffer.BlockCopy((Array) numArray, icondirentry.ImageOffset, (Array) iconFile.iconImage[index], 0, icondirentry.BytesInRes);
          checked { num1 += num2; }
          checked { ++index; }
        }
        gcHandle.Free();
        return iconFile;
      }

【问题讨论】：

icondirentry.BytesInRes - 1 + 1，对不起，但是什么？
IconClass.IconFile 是什么？有大量我们不知道的相关代码......
@PakkuDon 你有什么建议？
icondirentry.BytesInRes - 1 + 1???? icondirentry.BytesInRes - 0 怎么样？大声笑...
@PakkuDon 和 Jon Skeet；抱歉，将代码放在发生错误的位置时有点错误，我现在才更改它，如果您可以帮助我，请

标签： c# winforms

【解决方案1】：

(Array) iconFile.iconImage[index]

检查 index 是否不大于 IconImage（数组、列表或其他）成员的大小。

【讨论】：

@Xorraxx “我的意图是更改 exe 文件的图标” - 你为什么要这样做？对我来说听起来有点可疑

【解决方案2】：

我已经解决了这个问题... 由 Niraj Doshi 提供... 谢谢 Niraj Doshi。

代码如下：

public static IconClass.IconFile FromFile(string filename)
  {
    IconClass.IconFile iconFile = new IconClass.IconFile();
    byte[] numArray = File.ReadAllBytes(filename);
    GCHandle gcHandle = GCHandle.Alloc((object) numArray, GCHandleType.Pinned);
    iconFile.iconDir = (IconClass.ICONDIR) Marshal.PtrToStructure(gcHandle.AddrOfPinnedObject(), typeof (IconClass.ICONDIR));
    iconFile.iconEntry = new IconClass.ICONDIRENTRY[checked ((int) iconFile.iconDir.Count + 1 )];
    iconFile.iconImage = new byte[checked ((int) iconFile.iconDir.Count + 1)][];
    int num1 = Marshal.SizeOf((object) iconFile.iconDir);
    Type type = typeof (IconClass.ICONDIRENTRY);
    int num2 = Marshal.SizeOf(type);
    int num3 = 0;
    int num4 = checked ((int) iconFile.iconDir.Count-1);
    int index = num3;
    while (index <= num4)
    {
      IconClass.ICONDIRENTRY icondirentry = (IconClass.ICONDIRENTRY) Marshal.PtrToStructure(new IntPtr(checked (gcHandle.AddrOfPinnedObject().ToInt64() + (long) num1)), type);
      iconFile.iconEntry[index] = icondirentry;
      iconFile.iconImage[index] = new byte[checked (icondirentry.BytesInRes + 1)];
      Buffer.BlockCopy((Array) numArray, icondirentry.ImageOffset, (Array) iconFile.iconImage[index], 0, icondirentry.BytesInRes);
      checked { num1 += num2; }
      checked { ++index; }
    }
    gcHandle.Free();
    return iconFile;
  }

问题在于传递给进程的索引。

【讨论】：