0 
var result = (from p in productInQuery
  join o in orderInfoQuery on p.refNo equals o.refNo
  join x in productQuery on p.productNo equals x.no
  join t in productOutQuery on p.no equals t.productInNo into productIn
  from t in productIn.DefaultIfEmpty()
  orderby o.processDate descending
  select new
  {
      qty = p.qty,
      dateIn = o.processDate,
      dateOut = (DateTime?)(from m in orderInfoQuery where m.refNo == t.refNo select m.processDate).FirstOrDefault(),
      etaDate = (DateTime?)(from w in orderInfoQuery where w.refNo == t.refNo select w.eta).FirstOrDefault(),  
  })

   if (etaDate != DateTime.MinValue)
   {
      result = result.Where(x => x.etaDate == etaDate);  // Filter result
   }

   return result.ToArray();

我想像上面那样过滤 linq 结果，但它不起作用。

任何人都知道，如何使它工作？

[编辑]

出现错误消息，

Server Error in '/' Application.
Specified method is not supported.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NotSupportedException: Specified method is not supported.

Source Error:


Line 147:            result = result.Where(s => s.etaDate == null);
Line 148:
Line 149:            return result.ToArray();
Line 150:        }
Line 151:    }


Source File: WebUI\Models\Reports.cs    Line: 149

Stack Trace:


[NotSupportedException: Specified method is not supported.]
   MySql.Data.Entity.SqlGenerator.Visit(DbApplyExpression expression) +54
   System.Data.Common.CommandTrees.DbApplyExpression.Accept(DbExpressionVisitor`1 visitor) +23
   MySql.Data.Entity.SqlGenerator.VisitInputExpression(DbExpression e, String name, TypeUsage type) +65
   MySql.Data.Entity.SelectGenerator.VisitInputExpressionEnsureSelect(DbExpression e, String name, TypeUsage type) +53
   MySql.Data.Entity.SelectGenerator.Visit(DbProjectExpression expression) +132
   System.Data.Common.CommandTrees.DbProjectExpression.Accept(DbExpressionVisitor`1 visitor) +23
   MySql.Data.Entity.SqlGenerator.VisitInputExpression(DbExpression e, String name, TypeUsage type) +65
   MySql.Data.Entity.SelectGenerator.VisitInputExpressionEnsureSelect(DbExpression e, String name, TypeUsage type) +53
   MySql.Data.Entity.SelectGenerator.Visit(DbFilterExpression expression) +131
   System.Data.Common.CommandTrees.DbFilterExpression.Accept(DbExpressionVisitor`1 visitor) +23
   MySql.Data.Entity.SqlGenerator.VisitInputExpression(DbExpression e, String name, TypeUsage type) +65
   MySql.Data.Entity.SelectGenerator.VisitInputExpressionEnsureSelect(DbExpression e, String name, TypeUsage type) +53
   MySql.Data.Entity.SelectGenerator.Visit(DbProjectExpression expression) +132
   System.Data.Common.CommandTrees.DbProjectExpression.Accept(DbExpressionVisitor`1 visitor) +23
   MySql.Data.Entity.SqlGenerator.VisitInputExpression(DbExpression e, String name, TypeUsage type) +65
   MySql.Data.Entity.SelectGenerator.VisitInputExpressionEnsureSelect(DbExpression e, String name, TypeUsage type) +53
   MySql.Data.Entity.SelectGenerator.Visit(DbProjectExpression expression) +132
   System.Data.Common.CommandTrees.DbProjectExpression.Accept(DbExpressionVisitor`1 visitor) +23
   MySql.Data.Entity.SqlGenerator.VisitInputExpression(DbExpression e, String name, TypeUsage type) +65
   MySql.Data.Entity.SelectGenerator.VisitInputExpressionEnsureSelect(DbExpression e, String name, TypeUsage type) +53
   MySql.Data.Entity.SelectGenerator.Visit(DbProjectExpression expression) +132
   System.Data.Common.CommandTrees.DbProjectExpression.Accept(DbExpressionVisitor`1 visitor) +23
   MySql.Data.Entity.SqlGenerator.VisitInputExpression(DbExpression e, String name, TypeUsage type) +65
   MySql.Data.Entity.SelectGenerator.VisitInputExpressionEnsureSelect(DbExpression e, String name, TypeUsage type) +53
   MySql.Data.Entity.SelectGenerator.Visit(DbSortExpression expression) +168
   System.Data.Common.CommandTrees.DbSortExpression.Accept(DbExpressionVisitor`1 visitor) +23
   MySql.Data.Entity.SqlGenerator.VisitInputExpression(DbExpression e, String name, TypeUsage type) +65
   MySql.Data.Entity.SelectGenerator.VisitInputExpressionEnsureSelect(DbExpression e, String name, TypeUsage type) +53
   MySql.Data.Entity.SelectGenerator.Visit(DbProjectExpression expression) +132
   System.Data.Common.CommandTrees.DbProjectExpression.Accept(DbExpressionVisitor`1 visitor) +23
   MySql.Data.Entity.SelectGenerator.GenerateSQL(DbCommandTree tree) +169
   MySql.Data.MySqlClient.MySqlProviderServices.CreateDbCommandDefinition(DbProviderManifest providerManifest, DbCommandTree commandTree) +559
   System.Data.Common.DbProviderServices.CreateCommandDefinition(DbCommandTree commandTree) +147
   System.Data.EntityClient.EntityCommandDefinition..ctor(DbProviderFactory storeProviderFactory, DbCommandTree commandTree) +521

[EntityCommandCompilationException: An error occurred while preparing the command definition. See the inner exception for details.]
   System.Data.EntityClient.EntityCommandDefinition..ctor(DbProviderFactory storeProviderFactory, DbCommandTree commandTree) +1267
   System.Data.EntityClient.EntityProviderServices.CreateCommandDefinition(DbProviderFactory storeProviderFactory, DbCommandTree commandTree) +97
   System.Data.EntityClient.EntityProviderServices.CreateDbCommandDefinition(DbProviderManifest providerManifest, DbCommandTree commandTree) +198
   System.Data.Common.DbProviderServices.CreateCommandDefinition(DbCommandTree commandTree) +147
   System.Data.Objects.Internal.ObjectQueryExecutionPlan.Prepare(ObjectContext context, DbQueryCommandTree tree, Type elementType, MergeOption mergeOption, Span span, ReadOnlyCollection`1 compiledQueryParameters) +371
   System.Data.Objects.ELinq.ELinqQueryState.GetExecutionPlan(Nullable`1 forMergeOption) +642
   System.Data.Objects.ObjectQuery`1.GetResults(Nullable`1 forMergeOption) +149
   System.Data.Objects.ObjectQuery`1.System.Collections.Generic.IEnumerable<T>.GetEnumerator() +44
   System.Data.Entity.Internal.Linq.InternalQuery`1.GetEnumerator() +40
   System.Data.Entity.Infrastructure.DbQuery`1.System.Collections.Generic.IEnumerable<TResult>.GetEnumerator() +40
   System.Linq.Buffer`1..ctor(IEnumerable`1 source) +205
   System.Linq.Enumerable.ToArray(IEnumerable`1 source) +78
   BseWms.WebUI.Models.Reports.GetAllTransaction(TransactionSearchModel searchModel) in C:\Users\mark\Documents\Visual Studio 2010\Projects\BseWms\BseWms.WebUI\Models\Reports.cs:149
   BseWms.WebUI.Controllers.ReportsController.GetAllTransaction(TransactionSearchModel searchModel) in C:\Users\mark\Documents\Visual Studio 2010\Projects\BseWms\BseWms.WebUI\Controllers\ReportsController.cs:187
   lambda_method(Closure , ControllerBase , Object[] ) +108
   System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase controller, Object[] parameters) +17
   System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) +208
   System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +27
   System.Web.Mvc.<>c__DisplayClass15.<InvokeActionMethodWithFilters>b__12() +55
   System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation) +263
   System.Web.Mvc.<>c__DisplayClass17.<InvokeActionMethodWithFilters>b__14() +19
   System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodWithFilters(ControllerContext controllerContext, IList`1 filters, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +191
   System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) +343
   System.Web.Mvc.Controller.ExecuteCore() +116
   System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext) +97
   System.Web.Mvc.ControllerBase.System.Web.Mvc.IController.Execute(RequestContext requestContext) +10
   System.Web.Mvc.<>c__DisplayClassb.<BeginProcessRequest>b__5() +37
   System.Web.Mvc.Async.<>c__DisplayClass1.<MakeVoidDelegate>b__0() +21
   System.Web.Mvc.Async.<>c__DisplayClass8`1.<BeginSynchronous>b__7(IAsyncResult _) +12
   System.Web.Mvc.Async.WrappedAsyncResult`1.End() +62
   System.Web.Mvc.<>c__DisplayClasse.<EndProcessRequest>b__d() +50
   System.Web.Mvc.SecurityUtil.<GetCallInAppTrustThunk>b__0(Action f) +7
   System.Web.Mvc.SecurityUtil.ProcessInApplicationTrust(Action action) +22
   System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +60
   System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +9
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +8836977
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +184
4

2 回答 2

1

所以您确实意识到，在您向我们展示的代码中，etaDate 并未显示为创建或分配，对吗？您在评论中提到它，就像它在那里一样（除非我只是想念它），我认为这增加了混乱。就我个人而言，我发现为不同的目的重新使用变量名相当令人困惑。在您的匿名类型中，您创建一个名为 etaDate 的字段，并将其与我假设的名为 etaDate 的方法的变量进行比较。也许将过滤器一重命名为 etaFilterDate，会有所帮助。如果没有别的，它肯定会对这个问题有所帮助。

尝试使用调试器并在 Where() 子句上停止并检查结果和 etaDate 的内容。我怀疑你会发现没有与 etaDate 完全匹配的 x.etaDate。请记住，日期和时间都必须匹配。根据您的评论，我相信您的 etaDate 会有一个午夜的时间。

于 2012-07-17T18:06:16.550 回答
0

我假设您在第 17 行得到零结果？这种比较对我来说是正确的，可以选择etaDate匹配的所有结果etaDate。所以我猜你的问题是前面的查询没有找到任何匹配的记录etaDate——你能仔细检查一下是不是这样？

于 2012-07-09T04:30:59.170 回答