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Linqクエリ後の結果をフィルタリングしたいと思います。

List（）またはArray（）にします。

これが私のコードです、

//for test, filter is always true
bool filter = true;

OrdersRepository ordersRepository = new OrdersRepository();

var productInQuery = ordersRepository.ProductIn;
var productOutQuery = ordersRepository.ProductOut;
var productQuery = ordersRepository.Product;
var orderInfoQuery = ordersRepository.OrderInfo;

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 reportModel
      {
          yourRef = o.yourRefNo,
          modelNo = x.modelNo,
          mfgNo = p.mfgNo,
          serialNo = p.serialNo,
          poNo = p.poNo,
          lbs =  p.lbs,
          width = p.width,
          height = p.height,
          depth = p.depth,
          qty = p.qty,
          dateIn = o.processDate,
          dateOut = (from m in orderInfoQuery where m.refNo == t.refNo select m.processDate).FirstOrDefault(),
          etaDate = (from w in orderInfoQuery where w.refNo == t.refNo select w.eta).FirstOrDefault()
      });

// Filter one more time
if (filter)
{
    List<reportModel> a = (from q in result
         where q.etaDate >= new DateTime(2012, 5, 20)
         select q).ToList();

    //var a = result.Where(q => q.etaDate >= new DateTime(2012, 5, 20)).ToList(); //I tried this too, but it does not work either.
}
else
{
    var a = result.ToList();
}

上記のコードを実行すると、エラーメッセージが表示されます。

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 64:                  */
Line 65: 
Line 66:                 var a = result.Where(q => q.etaDate >= new DateTime(2012, 5, 20)).ToList();
Line 67:             }
Line 68:             else

Source File: WebUI\Controllers\TestController.cs    Line: 66 

Stack Trace: 


[NotSupportedException: Specified method is not supported.]
   MySql.Data.Entity.SqlGenerator.Visit(DbApplyExpression expression) +28
   System.Data.Common.CommandTrees.DbApplyExpression.Accept(DbExpressionVisitor`1 visitor) +23
   MySql.Data.Entity.SqlGenerator.VisitInputExpression(DbExpression e, String name, TypeUsage type) +35
   MySql.Data.Entity.SelectGenerator.VisitInputExpressionEnsureSelect(DbExpression e, String name, TypeUsage type) +21
   MySql.Data.Entity.SelectGenerator.Visit(DbProjectExpression expression) +38
   System.Data.Common.CommandTrees.DbProjectExpression.Accept(DbExpressionVisitor`1 visitor) +23
   MySql.Data.Entity.SqlGenerator.VisitInputExpression(DbExpression e, String name, TypeUsage type) +35
   MySql.Data.Entity.SelectGenerator.VisitInputExpressionEnsureSelect(DbExpression e, String name, TypeUsage type) +21
   MySql.Data.Entity.SelectGenerator.Visit(DbFilterExpression expression) +37
   System.Data.Common.CommandTrees.DbFilterExpression.Accept(DbExpressionVisitor`1 visitor) +23
   MySql.Data.Entity.SqlGenerator.VisitInputExpression(DbExpression e, String name, TypeUsage type) +35
   MySql.Data.Entity.SelectGenerator.VisitInputExpressionEnsureSelect(DbExpression e, String name, TypeUsage type) +21
   MySql.Data.Entity.SelectGenerator.Visit(DbProjectExpression expression) +38
   System.Data.Common.CommandTrees.DbProjectExpression.Accept(DbExpressionVisitor`1 visitor) +23
   MySql.Data.Entity.SqlGenerator.VisitInputExpression(DbExpression e, String name, TypeUsage type) +35
   MySql.Data.Entity.SelectGenerator.VisitInputExpressionEnsureSelect(DbExpression e, String name, TypeUsage type) +21
   MySql.Data.Entity.SelectGenerator.Visit(DbProjectExpression expression) +38
   System.Data.Common.CommandTrees.DbProjectExpression.Accept(DbExpressionVisitor`1 visitor) +23
   MySql.Data.Entity.SqlGenerator.VisitInputExpression(DbExpression e, String name, TypeUsage type) +35
   MySql.Data.Entity.SelectGenerator.VisitInputExpressionEnsureSelect(DbExpression e, String name, TypeUsage type) +21
   MySql.Data.Entity.SelectGenerator.Visit(DbSortExpression expression) +63
   System.Data.Common.CommandTrees.DbSortExpression.Accept(DbExpressionVisitor`1 visitor) +23
   MySql.Data.Entity.SqlGenerator.VisitInputExpression(DbExpression e, String name, TypeUsage type) +35
   MySql.Data.Entity.SelectGenerator.VisitInputExpressionEnsureSelect(DbExpression e, String name, TypeUsage type) +21
   MySql.Data.Entity.SelectGenerator.Visit(DbProjectExpression expression) +38
   System.Data.Common.CommandTrees.DbProjectExpression.Accept(DbExpressionVisitor`1 visitor) +23
   MySql.Data.Entity.SelectGenerator.GenerateSQL(DbCommandTree tree) +60
   MySql.Data.MySqlClient.MySqlProviderServices.CreateDbCommandDefinition(DbProviderManifest providerManifest, DbCommandTree commandTree) +334
   System.Data.Common.DbProviderServices.CreateCommandDefinition(DbCommandTree commandTree) +147
   System.Data.EntityClient.EntityCommandDefinition..ctor(DbProviderFactory storeProviderFactory, DbCommandTree commandTree) +526

[EntityCommandCompilationException: An error occurred while preparing the command definition. See the inner exception for details.]
   System.Data.EntityClient.EntityCommandDefinition..ctor(DbProviderFactory storeProviderFactory, DbCommandTree commandTree) +1329
   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) +397
   System.Data.Objects.ELinq.ELinqQueryState.GetExecutionPlan(Nullable`1 forMergeOption) +696
   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.Collections.Generic.List`1..ctor(IEnumerable`1 collection) +315
   System.Linq.Enumerable.ToList(IEnumerable`1 source) +58
   BseWms.WebUI.Controllers.TestController.dateTest() in C:\Users\mark\Documents\Visual Studio 2010\Projects\BseWms\BseWms.WebUI\Controllers\TestController.cs:66
   lambda_method(Closure , ControllerBase , Object[] ) +62
   System.Web.Mvc.<>c__DisplayClass1.<WrapVoidAction>b__0(ControllerBase controller, Object[] parameters) +17
   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() +8970349
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +184

およびreportModelクラス。

public class reportModel
{
    public string yourRef {get; set;}
    public string modelNo {get; set;}
    public string mfgNo {get; set;}
    public string serialNo {get; set;}
    public string poNo {get; set;}
    public Nullable<float> lbs { get; set; }
    public Nullable<float> width { get; set; }
    public Nullable<float> height { get; set; }
    public Nullable<float> depth { get; set; }
    public int qty {get; set;}
    public Nullable<DateTime> dateIn { get; set; }
    public Nullable<DateTime> dateOut { get; set; }
    public Nullable<DateTime> etaDate { get; set; }
}

このコードの何が問題になっていますか？@。@;

誰もが知っている、私にアドバイスしてください。

ありがとう

[編集]

@Tyrsius

私はあなたのアドバイスとして試しましたが、同じエラーが発生します。

var thedate = new DateTime(2012, 5, 20);
List<reportModel> a = (from q in result
                       where q.etaDate >= thedate
                       select q).ToList();

ここに画像の説明を入力してください

4

2 に答える 2

1

ここのビット

List<reportModel> a = (from q in result 
    where q.etaDate >= new DateTime(2012, 5, 20) select q).ToList();

EF はこれを SQL に変換する必要があり、 のようなオブジェクト コンストラクターを渡すことはできないため、これは違法ですnew Datetime()。解決策は簡単です。クエリで使用する前にオブジェクトを構築します

var date = new DateTime(2012, 5, 20);
List<reportModel> a = (from q in result 
    where q.etaDate >= date select q).ToList();
于 2012-07-13T03:35:58.407 に答える
0

結果が正常に実行されると仮定すると、次のようにクエリをフィルタリングできます。

if(filter)
{
    var dateFilter = new DateTime(2012, 5, 20);
    result = result.Where(x => x.etaDate >= dateFilter);
}

return result.ToList(); //or .ToArray()

結果の実行後にブレークポイントを設定し、適切な reportModel があるかどうかを確認することをお勧めします。結果はすでに IQueryable としてキャストされていますが、それをリストにキャストする特定の理由はありますか?

お役に立てれば。

于 2012-07-14T00:28:09.107 に答える