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在我的应用程序中一次执行两件事。定时器在后台线程中每隔几秒触发一次请求更新数据网格。下面是由线程运行的代码:实体框架 - 同时执行多个查询时出错
// Query
var qryPickupRequests = from pr in objDataContext.pickupRequests
.Include("toLocation")
.Include("fromLocation")
.Include("person")
orderby pr.creationDate ascending
select pr;
// Refresh from server?
if (boolRefreshFromServer)
(qryPickupRequests as ObjectQuery).MergeOption = MergeOption.PreserveChanges;
// Limit?
if (intLimit > 0)
return qryPickupRequests.Take(intLimit).ToList<pickupRequest>();
else
return qryPickupRequests.ToList<pickupRequest>();
现在,在UI线程,还有另一种形式打开正在更新的位置网格:
/// <summary>
/// Refreshes the specified location data grid
/// </summary>
/// <param name="sender">Instance of GridLookupEdit to update</param>
private static void RefreshLocations(object sender) {
GridLookUpEdit objEditor = sender as GridLookUpEdit;
objEditor.Properties.DataSource = BRData.Models.LocationModel.GetLocationList(true);
objEditor.Properties.DisplayMember = "locationName";
objEditor.Properties.ValueMember = "locationID";
}
我的问题当两个代码块都在同一时间执行时。我得到以下错误:
内部异常如下:
There is already an open DataReader associated with this Connection which must be closed first.
为什么并发数据库操作都不会被实体框架正确处理任何想法----或者我?
你是对的。我不知道他们不是线程安全的。谢谢! – 2011-02-09 01:23:58