第1步) 我检查我可以访问服务器: (因为我有离线处理)
public static bool dbOnline(string timeOut="3")
{
bool online = false;
try
{
var testConn = new SqlConnection(Utils.ConnectionStr(timeOut));
testConn.Open();
online = true;
testConn.Close();
}
catch (Exception)
{
online = false;
}
return online;
}
2)它返回ok,然后我创建dlinq实例!
_DataContext = new DataContext(Utils.ConnectionStr);//System.Data.Linq.DataContext
//then i point out a customer in DB
var customer = _DataContext.Customers.TableQuery().FirstOrDefault(c => c.ID == custid);
//Check its not null
if (customer != null)
{
customer.points+= _points;
customer.LastUpdated = DateTime.Now;
customer.SubmitChanges();
}
3)有时我会得到这个错误,我能做些什么来阻止这个,或者是它 修复网络? (我知道网络存在一些问题),但我可以做任何事情 不同? - 谢谢
错误: * System.Data.SqlClient.SqlException(0x80131904):超时已过期。操作完成之前经过的超时时间或服务器没有响应。 *
The statement has been terminated.
at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection)
at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection)
at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning()
at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj)
at System.Data.SqlClient.SqlDataReader.ConsumeMetaData()
at System.Data.SqlClient.SqlDataReader.get_MetaData()
at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString)
at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async)
at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result)
at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method)
at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method)
at System.Data.SqlClient.SqlCommand.ExecuteDbDataReader(CommandBehavior behavior)
at System.Data.Common.DbCommand.ExecuteReader()
at System.Data.Linq.SqlClient.SqlProvider.Execute(Expression query, QueryInfo queryInfo, IObjectReaderFactory factory, Object[] parentArgs, Object[] userArgs, ICompiledSubQuery[] subQueries, Object lastResult)
at System.Data.Linq.SqlClient.SqlProvider.ExecuteAll(Expression query, QueryInfo[] queryInfos, IObjectReaderFactory factory, Object[] userArguments, ICompiledSubQuery[] subQueries)
at System.Data.Linq.SqlClient.SqlProvider.System.Data.Linq.Provider.IProvider.Execute(Expression query)
at System.Data.Linq.ChangeDirector.StandardChangeDirector.DynamicUpdate(TrackedObject item)
at System.Data.Linq.ChangeDirector.StandardChangeDirector.Update(TrackedObject item)
at System.Data.Linq.ChangeProcessor.SubmitChanges(ConflictMode failureMode)
at System.Data.Linq.DataContext.SubmitChanges(ConflictMode failureMode)
答案 0 :(得分:1)
超时无法单独识别,但我通常会认为网络错误会产生不同的错误。我首先要看的东西:
我的钱将在第二个
另外,我们看不到TableQuery()
是什么;如果它返回IEnumerable<Customer>
,那么它可能与拉过太多数据有关(在你的上下文中,它可能应该在最小值处返回IQueryable<Customer>
,但我们看不到)。
这里要做的真正的事情是运行SQL跟踪并尝试在行为中捕获它 - 看看发生了什么。