我正在尝试读取大量文件并将某些信息存储在字典中。我完整的代码是:
[HttpGet("[action]")]
public JsonResult GenerateMapFiles()
{
Dictionary<string, List<Tuple<string, ushort>>>[] CodeMapping = new Dictionary<string, List<Tuple<string, ushort>>>[256];
/* Pre-creating some dictionaries */
CodeMapping[2] = new Dictionary<string, List<Tuple<string, ushort>>>(256);
CodeMapping[8] = new Dictionary<string, List<Tuple<string, ushort>>>(256);
CodeMapping[16] = new Dictionary<string, List<Tuple<string, ushort>>>(256);
CodeMapping[32] = new Dictionary<string, List<Tuple<string, ushort>>>(256);
CodeMapping[64] = new Dictionary<string, List<Tuple<string, ushort>>>(256);
CodeMapping[128] = new Dictionary<string, List<Tuple<string, ushort>>>(256);
CodeMapping[256] = new Dictionary<string, List<Tuple<string, ushort>>>(256);
string[] fileList = System.IO.Directory.GetFiles("C:\\mySQL");
/* Processing code was here, but I commented it and it is still generating exception */
return Json(CodeMapping);
}
第string[] fileList = System.IO.Directory.GetFiles("C:\\mySQL");
行引发异常:
Exception thrown: 'System.IndexOutOfRangeException' in XXXXX.dll: 'Index was outside the bounds of the array.'
如果我注释CodeMapping [X]分配,则没有错误,并且将填充fileList。我不明白为什么前几行会影响这一行。 有人可以向我解释原因吗?
答案 0 :(得分:0)
好的,我在提交时找到了解决方案,这显然是Visual Studio的一个错误,它没有在调试模式下指向正确的行。我的第一行应该是:
Dictionary<string, List<Tuple<string, ushort>>>[] CodeMapping = new Dictionary<string, List<Tuple<string, ushort>>>[257];
答案 1 :(得分:0)
我认为您应该在n-1个位置上创建字典,因为如果集合有256个元素,则最大索引将从0到255。
因此您将其重写为:
/* Pre-creating some dictionaries */
CodeMapping[1] = new Dictionary<string, List<Tuple<string, ushort>>>(256);
CodeMapping[7] = new Dictionary<string, List<Tuple<string, ushort>>>(256);
CodeMapping[15] = new Dictionary<string, List<Tuple<string, ushort>>>(256);
CodeMapping[31] = new Dictionary<string, List<Tuple<string, ushort>>>(256);
CodeMapping[63] = new Dictionary<string, List<Tuple<string, ushort>>>(256);
CodeMapping[127] = new Dictionary<string, List<Tuple<string, ushort>>>(256);
CodeMapping[255] = new Dictionary<string, List<Tuple<string, ushort>>>(256);