C# mscorlib.dll 中发生类型为“System.ArgumentOutOfRangeException”的未处理异常
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An unhandled exception of type 'System.ArgumentOutOfRangeException' occurred in mscorlib.dll
提问by user2413158
In the following code, I got following error.
在以下代码中，我收到以下错误。
An unhandled exception of type 'System.ArgumentOutOfRangeException' occurred in mscorlib.dll
Additional information: Index was out of range. Must be non-negative and less than the size of the collection.
mscorlib.dll 中发生类型为“System.ArgumentOutOfRangeException”的未处理异常
附加信息：索引超出范围。必须是非负的并且小于集合的大小。
Here is code:
这是代码：
public ProcessInformation GetMaxRunTimeForApplicationsBetween(DateTime StartingTime, DateTime EndingTime)
{
//Filter Based on Timer
List<ProcessInformation> filterList = new List<ProcessInformation>();
foreach (HarvestApp.ProcessInformation item in this.ProcessList)
{
if (item.started_at.CompareTo(StartingTime) >= 0 && item.ended_at.CompareTo(EndingTime) <= 0)
{
filterList.Add(item);
}
}
//Count Max Occurrence of Application
List<int> countApplicationList = new List<int>();
List<string> applicationNameList = new List<string>();
foreach (HarvestApp.ProcessInformation item in filterList)
{
if (applicationNameList.Contains(item.name))
{
countApplicationList[applicationNameList.IndexOf(item.name)]++;
}
else
{
applicationNameList.Add(item.name);
countApplicationList.Add(1);
}
}
//if (countApplicationList.Count == 0)
//{
// throw new InvalidOperationException("Empty list");
//}
int max = int.MinValue;
foreach (int item in countApplicationList)
{
if (item > max)
{
max = item;
}
}
//Return corresponding ProcessInformation Class of applicationNameList
return filterList[filterList.FindIndex(delegate
(ProcessInformation proc)
{
return proc.name.Equals(applicationNameList[countApplicationList.IndexOf(max)], StringComparison.Ordinal);
})];
}
回答by Venu Vedula
Here is the problem:
这是问题所在：
if (applicationNameList.Contains(item.name))
{
**countApplicationList[applicationNameList.IndexOf(item.name)]++;**
}
It should be like this
应该是这样的
if (applicationNameList.Contains(item.name) && countApplicationList.Count > applicationNameList.IndexOf(item.name))
{
countApplicationList[applicationNameList.IndexOf(item.name)]++;
}
回答by ???
I think error line is here:
我认为错误行在这里：
return filterList[filterList.FindIndex(delegate(ProcessInformation proc)
{
return proc.name.Equals(applicationNameList[countApplicationList.IndexOf(max)], StringComparison.Ordinal);
})];
Because List<T>.FindIndexcan return -1when you can't find index.
因为找不到索引时List<T>.FindIndex可以返回-1。
Instead you should test if the index is less than 0, which indicates there is an error, before you use it:
相反，您应该在使用它之前测试索引是否小于 0，这表明存在错误：
int result = filterList.FindIndex(delegate(ProcessInformation proc)
{
return proc.name.Equals(applicationNameList[countApplicationList.IndexOf(max)], StringComparison.Ordinal);
});
if(result < 0) throw new Exception("Cant't Find ProcessInformation");
return filterList[result];
