c# - Linq 错误：不是组键的成员（当 GroupBy 有许多非键列时）

Question

我需要按不属于表索引的许多列进行分组。表的键是属性“id”。

我已经阅读并基本了解了MSDN 博客上的各种方法，以及 SO、扩展属性等，但这种方法是我唯一可以使用的编译方法。

var query = from f in this.dbContext.Tokens
            group f by new { f.PI, f.TI, f.UIDP, f.AttributesJSON, f.IssuerParameters, f.IsDeviceProtected , f.FriendlyName}
                        into myGroup
                        where myGroup.Count() > 0
                        select new
                        {
                            myGroup.Key.UIDP,
                            myGroup.Key.TI,
                            myGroup.Key.PI,
                            myGroup.Key.AttributesJSON,
                            myGroup.Key.IssuerParameters,
                            myGroup.Key.FriendlyName,
                            Count = myGroup.Count(),
                            Subgroups = from privateTokens in myGroup
                                        select new
                                        {
                                           // AttributesJSON = privateTokens.AttributesJSON,
                                           // FriendlyName = privateTokens.FriendlyName,
                                            Id = privateTokens.Id,
                                          //  IsDeviceProtected = privateTokens.IsDeviceProtected,
                                           // IssuerParameters = privateTokens.IssuerParameters,
                                           // PI = privateTokens.PI,
                                           // PrivateKey = privateTokens.PrivateKey,
                                           // TI = privateTokens.TI,
                                            TokenData = privateTokens.TokenData,
                                            UIDP = privateTokens.UIDP,
                                        }
                        };

我使用的 ORM 是 Telerik Openaccess，但我认为这个问题是 SQL 问题。

错误如下。

Not a member of the group key.
Parameter name: memberInfo
Actual value was Int32 Id.

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.ArgumentOutOfRangeException: Not a member of the group key.
Parameter name: memberInfo
Actual value was Int32 Id.

Source Error: 


Line 86:                             };
Line 87: 
Line 88:             string asdfdsfd = query.ToString();
Line 89: 
Line 90:             // todo, limit to a per user

Source File: \\psf\home\Documents\Visual Studio 2013\Projects\BitClearTokens\BitclearClient\Controllers\TokenController.cs    Line: 88 

Stack Trace: 


[ArgumentOutOfRangeException: Not a member of the group key.
Parameter name: memberInfo
Actual value was Int32 Id.]
   Telerik.OpenAccess.Query.ExpressionCompiler.PerformDatabaseQueryImpl(Type resultType, Int32 elementAt, Object[] groupResolutionParamValues, Boolean single, Boolean checkOid) +2571
   Telerik.OpenAccess.Query.ExpressionCompiler.PerformDatabaseQuery(Type type, Int32 elementAt, Object[] groupResolutionParamValues, Boolean single, Boolean checkOid) +97

[InvalidOperationException: An exception occured during the execution of 'Extent<BitclearProverModel.Tokens>().GroupBy(f => new <>f__AnonymousType3`7(PI = f.PI, TI = f.TI, UIDP = f.UIDP, AttributesJSON = f.AttributesJSON, IssuerParameters = f.IssuerParameters, IsDeviceProtected = f.IsDeviceProtected, FriendlyName = f.FriendlyName)).Where(myGroup => (myGroup.Count() > 0)).Select(myGroup => new <>f__AnonymousType5`8(UIDP = myGroup.Key.UIDP, TI = myGroup.Key.TI, PI = myGroup.Key.PI, AttributesJSON = myGroup.Key.AttributesJSON, IssuerParameters = myGroup.Key.IssuerParameters, FriendlyName = myGroup.Key.FriendlyName, Count = myGroup.Count(), Subgroups = myGroup.Select(privateTokens => new <>f__AnonymousType4`3(Id = privateTokens.Id, TokenData = privateTokens.TokenData, UIDP = privateTokens.UIDP))))'. Failure: Not a member of the group key.
Parameter name: memberInfo
Actual value was Int32 Id.
See InnerException for more details.
Complete Expression:
.Call System.Linq.Queryable.Select(
    .Call System.Linq.Queryable.Where(
        .Call System.Linq.Queryable.GroupBy(
            .Constant<Telerik.OpenAccess.Query.ExtentQueryImpl`1[BitclearProverModel.Tokens]>(Extent<BitclearProverModel.Tokens>()),
            '(.Lambda #Lambda1<System.Func`2[BitclearProverModel.Tokens,<>f__AnonymousType3`7[System.String,System.String,System.String,System.String,System.String,System.Boolean,System.String]]>))
        ,
        '(.Lambda #Lambda2<System.Func`2[System.Linq.IGrouping`2[<>f__AnonymousType3`7[System.String,System.String,System.String,System.String,System.String,System.Boolean,System.String],BitclearProverModel.Tokens],System.Boolean]>))
    ,
    '(.Lambda #Lambda3<System.Func`2[System.Linq.IGrouping`2[<>f__AnonymousType3`7[System.String,System.String,System.String,System.String,System.String,System.Boolean,System.String],BitclearProverModel.Tokens],<>f__AnonymousType5`8[System.String,System.String,System.String,System.String,System.String,System.String,System.Int32,System.Collections.Generic.IEnumerable`1[<>f__AnonymousType4`3[System.Int32,System.String,System.String]]]]>))

.Lambda #Lambda1<System.Func`2[BitclearProverModel.Tokens,<>f__AnonymousType3`7[System.String,System.String,System.String,System.String,System.String,System.Boolean,System.String]]>(BitclearProverModel.Tokens $f)
{
    .New <>f__AnonymousType3`7[System.String,System.String,System.String,System.String,System.String,System.Boolean,System.String](
        $f.PI,
        $f.TI,
        $f.UIDP,
        $f.AttributesJSON,
        $f.IssuerParameters,
        $f.IsDeviceProtected,
        $f.FriendlyName)
}

.Lambda #Lambda2<System.Func`2[System.Linq.IGrouping`2[<>f__AnonymousType3`7[System.String,System.String,System.String,System.String,System.String,System.Boolean,System.String],BitclearProverModel.Tokens],System.Boolean]>(System.Linq.IGrouping`2[<>f__AnonymousType3`7[System.String,System.String,System.String,System.String,System.String,System.Boolean,System.String],BitclearProverModel.Tokens] $myGroup)
{
    .Call System.Linq.Enumerable.Count($myGroup) > 0
}

.Lambda #Lambda3<System.Func`2[System.Linq.IGrouping`2[<>f__AnonymousType3`7[System.String,System.String,System.String,System.String,System.String,System.Boolean,System.String],BitclearProverModel.Tokens],<>f__AnonymousType5`8[System.String,System.String,System.String,System.String,System.String,System.String,System.Int32,System.Collections.Generic.IEnumerable`1[<>f__AnonymousType4`3[System.Int32,System.String,System.String]]]]>(System.Linq.IGrouping`2[<>f__AnonymousType3`7[System.String,System.String,System.String,System.String,System.String,System.Boolean,System.String],BitclearProverModel.Tokens] $myGroup)
{
    .New <>f__AnonymousType5`8[System.String,System.String,System.String,System.String,System.String,System.String,System.Int32,System.Collections.Generic.IEnumerable`1[<>f__AnonymousType4`3[System.Int32,System.String,System.String]]](
        ($myGroup.Key).UIDP,
        ($myGroup.Key).TI,
        ($myGroup.Key).PI,
        ($myGroup.Key).AttributesJSON,
        ($myGroup.Key).IssuerParameters,
        ($myGroup.Key).FriendlyName,
        .Call System.Linq.Enumerable.Count($myGroup),
        .Call System.Linq.Enumerable.Select(
            $myGroup,
            .Lambda #Lambda4<System.Func`2[BitclearProverModel.Tokens,<>f__AnonymousType4`3[System.Int32,System.String,System.String]]>)
    )
}

.Lambda #Lambda4<System.Func`2[BitclearProverModel.Tokens,<>f__AnonymousType4`3[System.Int32,System.String,System.String]]>(BitclearProverModel.Tokens $privateTokens)
{
    .New <>f__AnonymousType4`3[System.Int32,System.String,System.String](
        $privateTokens.Id,
        $privateTokens.TokenData,
        $privateTokens.UIDP)
}
]
   Telerik.OpenAccess.Query.ExpressionCompiler.PerformDatabaseQuery(Type type, Int32 elementAt, Object[] groupResolutionParamValues, Boolean single, Boolean checkOid) +531
   Telerik.OpenAccess.Query.ExpressionCompiler.GetBackendQuery(Type resultType) +125
   Telerik.OpenAccess.Query.ExpressionExecution.PerformQueryCompilation(Expression expr, ChainedContext ctx, Boolean tryGetObjectById, Type resultType, String dump, QueryOptions options) +230
   Telerik.OpenAccess.Query.Piece`1.ToString() +415
   BitclearClient.Controllers.<Index>d__0.MoveNext() in \\psf\home\Documents\Visual Studio 2013\Projects\BitClearTokens\BitclearClient\Controllers\TokenController.cs:88
   System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +93
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +52
   System.Runtime.CompilerServices.TaskAwaiter.GetResult() +21
   lambda_method(Closure , Task ) +64
   System.Threading.Tasks.TaskHelpersExtensions.ThrowIfFaulted(Task task) +31
   System.Web.Mvc.Async.TaskAsyncActionDescriptor.EndExecute(IAsyncResult asyncResult) +67
   System.Web.Mvc.Async.<>c__DisplayClass3f.<BeginInvokeAsynchronousActionMethod>b__3e(IAsyncResult asyncResult) +16
   System.Web.Mvc.Async.WrappedAsyncResult`1.End() +57
   System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult) +48
   System.Web.Mvc.Async.<>c__DisplayClass39.<BeginInvokeActionMethodWithFilters>b__33() +57
   System.Web.Mvc.Async.<>c__DisplayClass4f.<InvokeActionMethodFilterAsynchronously>b__49() +223
   System.Web.Mvc.Async.<>c__DisplayClass37.<BeginInvokeActionMethodWithFilters>b__36(IAsyncResult asyncResult) +10
   System.Web.Mvc.Async.WrappedAsyncResult`1.End() +57
   System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethodWithFilters(IAsyncResult asyncResult) +48
   System.Web.Mvc.Async.<>c__DisplayClass2a.<BeginInvokeAction>b__20() +24
   System.Web.Mvc.Async.<>c__DisplayClass25.<BeginInvokeAction>b__22(IAsyncResult asyncResult) +102
   System.Web.Mvc.Async.WrappedAsyncResult`1.End() +57
   System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) +43
   System.Web.Mvc.<>c__DisplayClass1d.<BeginExecuteCore>b__18(IAsyncResult asyncResult) +14
   System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +23
   System.Web.Mvc.Async.WrappedAsyncResult`1.End() +62
   System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +57
   System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +23
   System.Web.Mvc.Async.WrappedAsyncResult`1.End() +62
   System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +47
   System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.EndExecute(IAsyncResult asyncResult) +10
   System.Web.Mvc.<>c__DisplayClass8.<BeginProcessRequest>b__3(IAsyncResult asyncResult) +25
   System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +23
   System.Web.Mvc.Async.WrappedAsyncResult`1.End() +62
   System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +47
   System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +9
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +9688704
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155

Answer 1

从 OpenAccess 的 2013 年第 3 季度 SP1 版本（将在接下来的 10 天内公开发布）开始，按布尔值分组已修复，您应该能够使用您的查询并进行以下概述的一些修改。

Subgroups不幸的是，OpenAccess 不支持应该构建的第二个投影。您可以通过调用.ToList()用于分组查询的查询在客户端处理它来克服此限制。从性能上讲，它会慢一些，但代价不应该很大。

修改查询：

var query = from f in this.dbContext.Tokens
        group f by new { f.PI, f.TI, f.UIDP, f.AttributesJSON, f.IssuerParameters, f.IsDeviceProtected , f.FriendlyName}
                    into myGroup
                    where myGroup.Count() > 0
                    select new
                    {
                        myGroup.Key.UIDP,
                        myGroup.Key.TI,
                        myGroup.Key.PI,
                        myGroup.Key.AttributesJSON,
                        myGroup.Key.IssuerParameters,
                        myGroup.Key.FriendlyName,
                        Count = myGroup.Count(),
                        Subgroups = myGroup
                    };
var groupedResult = query.ToList();
var resultWithSubGroups = from gr in groupedResult
                          select new
                          {
                              gr.UIDP,
                              gr.TI,
                              gr.PI,
                              gr.AttributesJSON,
                              gr.IssuerParameters,
                              gr.FriendlyName,
                              gr.Count,
                              Subgroups = from privateTokens in gr
                                          select new 
                                          {
                                              // AttributesJSON = privateTokens.AttributesJSON,
                                              // FriendlyName = privateTokens.FriendlyName,
                                              Id = privateTokens.Id,
                                              //  IsDeviceProtected = privateTokens.IsDeviceProtected,
                                              // IssuerParameters = privateTokens.IssuerParameters,
                                              // PI = privateTokens.PI,
                                              // PrivateKey = privateTokens.PrivateKey,
                                              // TI = privateTokens.TI,
                                              TokenData = privateTokens.TokenData,
                                              UIDP = privateTokens.UIDP,
                                          }
                           };

Answer 2

通过反复试验，我发现“子组”是导致问题的原因。通过删除它们，我发现了第二个问题。

Telerik Open Access 不想按 bool 字段分组，这正是“设备受保护”的含义。

  // this is the removed line
   Subgroups = from privateTokens in myGroup
                                    select new
                                    {
                                       // AttributesJSON = privateTokens.AttributesJSON,
                                       // FriendlyName = privateTokens.FriendlyName,
                                        Id = privateTokens.Id,
                                      //  IsDeviceProtected = privateTokens.IsDeviceProtected,
                                       // IssuerParameters = privateTokens.IssuerParameters,
                                       // PI = privateTokens.PI,
                                       // PrivateKey = privateTokens.PrivateKey,
                                       // TI = privateTokens.TI,
                                        TokenData = privateTokens.TokenData,
                                        UIDP = privateTokens.UIDP,
                                    }