相关疑难解决方法(0)

我为EventLogEntry实现了一个自定义的IEqualityComparer.

public class EventLogEntryListComparison :
    IEqualityComparer<List<EventLogEntry>>,
    IEqualityComparer<EventLogEntry>

对于IEqualityComparer<List<EventLogEntry>>,GetHashCode函数非常简单.

public int GetHashCode(List<EventLogEntry> obj)
{
    return obj.Sum(entry => 23 * GetHashCode(entry));
}

但是,这会为某些条目抛出OverflowException.

"Arithmetic operation resulted in an overflow."
   at System.Linq.Enumerable.Sum(IEnumerable`1 source)
   at System.Linq.Enumerable.Sum[TSource](IEnumerable`1 source, Func`2 selector)
   at <snip>.Diagnostics.EventLogAnalysis.EventLogEntryListComparison.GetHashCode(List`1 obj) in C:\dev\<snip>Diagnostics.EventLogAnalysis\EventLogEntryListComparison.cs:line 112
   at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)
   at System.Collections.Generic.Dictionary`2.set_Item(TKey key, TValue value)
   at <snip>.Diagnostics.EventLogAnalysis.Program.AnalyseMachine(String validMachineName) in C:\dev\<snip>.Diagnostics.EventLogAnalysis\Program.cs:line 104
   at System.Threading.Tasks.Parallel.<>c__DisplayClass2d`2.<ForEachWorker>b__23(Int32 i)
   at System.Threading.Tasks.Parallel.<>c__DisplayClassf`1.<ForWorker>b__c()

在调试时尝试获得相同的错误并且无法在即时窗口中,我将代码更改为此并再见了OverflowException？

int total = 0;
foreach (var eventLogEntry in obj)
{
    total += GetHashCode(eventLogEntry); …