获取不到EventLogEntry.Message的值

无法找到事件ID描述'0'。本地计算机可能没有必要的注册表信息或消息DLL文件来显示邮件，或者可能没有权限访问
EventLog eventLog;
eventLog=new EventLog("TestEvent",".","mySource");
eventLog.Log="TestEvent";
foreach(EventLogEntry eventlogEntry in eventLog.Entries)
{
string s=eventlogEntry.Message;
}