我正在使用 EF6 代码优先和每个层次结构表编写一个 ASP.Net 应用程序
每当我尝试对 dbcontext 执行任何有意义的操作（例如查询、更新等）时，我都会收到此错误：
{
"Message": "An error has occurred.",
"ExceptionMessage": "An error occurred while preparing the command definition. See the inner exception for details.",
"ExceptionType": "System.Data.Entity.Core.EntityCommandCompilationException",
"StackTrace": " at System.Data.Entity.Core.EntityClient.Internal.EntityCommandDefinition..ctor(DbProviderFactory storeProviderFactory, DbCommandTree commandTree, DbInterceptionContext interceptionContext, IDbDependencyResolver resolver, BridgeDataReaderFactory bridgeDataReaderFactory, ColumnMapFactory columnMapFactory)\r\n at System.Data.Entity.Core.EntityClient.Internal.EntityProviderServices.CreateDbCommandDefinition(DbProviderManifest providerManifest, DbCommandTree commandTree, DbInterceptionContext interceptionContext)\r\n at System.Data.Entity.Core.Objects.Internal.ObjectQueryExecutionPlanFactory.CreateCommandDefinition(ObjectContext context, DbQueryCommandTree tree)\r\n at System.Data.Entity.Core.Objects.Internal.ObjectQueryExecutionPlanFactory.Prepare(ObjectContext context, DbQueryCommandTree tree, Type elementType, MergeOption mergeOption, Boolean streaming, Span span, IEnumerable`1 compiledQueryParameters, AliasGenerator aliasGenerator)\r\n at System.Data.Entity.Core.Objects.ELinq.ELinqQueryState.GetExecutionPlan(Nullable`1 forMergeOption)\r\n at System.Data.Entity.Core.Objects.ObjectQuery`1.<>c__DisplayClass7.<GetResults>b__6()\r\n at System.Data.Entity.Core.Objects.ObjectContext.ExecuteInTransaction[T](Func`1 func, IDbExecutionStrategy executionStrategy, Boolean startLocalTransaction, Boolean releaseConnectionOnSuccess)\r\n at System.Data.Entity.Core.Objects.ObjectQuery`1.<>c__DisplayClass7.<GetResults>b__5()\r\n at System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute[TResult](Func`1 operation)\r\n at System.Data.Entity.Core.Objects.ObjectQuery`1.GetResults(Nullable`1 forMergeOption)\r\n at System.Data.Entity.Core.Objects.ObjectQuery`1.<System.Collections.Generic.IEnumerable<T>.GetEnumerator>b__0()\r\n at System.Data.Entity.Internal.LazyEnumerator`1.MoveNext()\r\n at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)\r\n at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)\r\n at SealingServer.Controllers.PdfsController.<PostPdf>d__4.MoveNext() in C:\Users\thoma_000\Documents\All Code\SealingServer\SealingServer\Controllers\PdfsController.cs:line 93\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()\r\n at System.Threading.Tasks.TaskHelpersExtensions.<CastToObject>d__3`1.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()\r\n at System.Web.Http.Controllers.ApiControllerActionInvoker.<InvokeActionAsyncCore>d__0.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()\r\n at System.Web.Http.Controllers.ActionFilterResult.<ExecuteAsync>d__2.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()\r\n at System.Web.Http.Dispatcher.HttpControllerDispatcher.<SendAsync>d__1.MoveNext()",
"InnerException": {
"Message": "An error has occurred.",
"ExceptionMessage": "The given key was not present in the dictionary.",
"ExceptionType": "System.Collections.Generic.KeyNotFoundException",
"StackTrace": " at System.Collections.Generic.Dictionary`2.get_Item(TKey key)\r\n at System.Data.Entity.Core.Mapping.ViewGeneration.Structures.MemberDomainMap.GetDomainInternal(MemberPath path)\r\n at System.Data.Entity.Core.Mapping.ViewGeneration.QueryRewriting.FragmentQueryKB.CreateIsOfTypeCondition(MemberPath currentPath, IEnumerable`1 derivedTypes, MemberDomainMap domainMap)\r\n at System.Data.Entity.Core.Mapping.ViewGeneration.QueryRewriting.FragmentQueryKB.CreateVariableConstraintsRecursion(EdmType edmType, MemberPath currentPath, MemberDomainMap domainMap, EdmItemCollection edmItemCollection)\r\n at System.Data.Entity.Core.Mapping.ViewGeneration.QueryRewriting.FragmentQueryKB.CreateVariableConstraintsRecursion(EdmType edmType, MemberPath currentPath, MemberDomainMap domainMap, EdmItemCollection edmItemCollection)\r\n at System.Data.Entity.Core.Mapping.ViewGeneration.ViewgenContext..ctor(ViewTarget viewTarget, EntitySetBase extent, IList`1 extentCells, CqlIdentifiers identifiers, ConfigViewGenerator config, MemberDomainMap queryDomainMap, MemberDomainMap updateDomainMap, EntityContainerMapping entityContainerMapping)\r\n at System.Data.Entity.Core.Mapping.ViewGeneration.ViewGenerator.CreateViewgenContext(EntitySetBase extent, ViewTarget viewTarget, CqlIdentifiers identifiers)\r\n at System.Data.Entity.Core.Mapping.ViewGeneration.ViewGenerator.GenerateDirectionalViewsForExtent(ViewTarget viewTarget, EntitySetBase extent, CqlIdentifiers identifiers, KeyToListMap`2 views)\r\n at System.Data.Entity.Core.Mapping.ViewGeneration.ViewGenerator.GenerateDirectionalViews(ViewTarget viewTarget, CqlIdentifiers identifiers, KeyToListMap`2 views)\r\n at System.Data.Entity.Core.Mapping.ViewGeneration.ViewGenerator.GenerateAllBidirectionalViews(KeyToListMap`2 views, CqlIdentifiers identifiers)\r\n at System.Data.Entity.Core.Mapping.ViewGeneration.ViewgenGatekeeper.GenerateViewsFromCells(List`1 cells, ConfigViewGenerator config, CqlIdentifiers identifiers, EntityContainerMapping containerMapping)\r\n at System.Data.Entity.Core.Mapping.StorageMappingItemCollection.ViewDictionary.SerializedGenerateViews(EntityContainerMapping entityContainerMap, Dictionary`2 resultDictionary)\r\n at System.Data.Entity.Core.Mapping.StorageMappingItemCollection.ViewDictionary.SerializedGetGeneratedViews(EntityContainer container)\r\n at System.Data.Entity.Core.Common.Utils.Memoizer`2.Result.GetValue()\r\n at System.Data.Entity.Core.Common.Utils.Memoizer`2.Evaluate(TArg arg)\r\n at System.Data.Entity.Core.Mapping.StorageMappingItemCollection.ViewDictionary.GetGeneratedView(EntitySetBase extent, MetadataWorkspace workspace, StorageMappingItemCollection storageMappingItemCollection)\r\n at System.Data.Entity.Core.Metadata.Edm.MetadataWorkspace.GetGeneratedView(EntitySetBase extent)\r\n at System.Data.Entity.Core.Query.PlanCompiler.PreProcessor.ExpandView(ScanTableOp scanTableOp, IsOfOp& typeFilter)\r\n at System.Data.Entity.Core.Query.PlanCompiler.PreProcessor.ProcessScanTable(Node scanTableNode, ScanTableOp scanTableOp, IsOfOp& typeFilter)\r\n at System.Data.Entity.Core.Query.PlanCompiler.PreProcessor.Visit(ScanTableOp op, Node n)\r\n at System.Data.Entity.Core.Query.PlanCompiler.SubqueryTrackingVisitor.VisitChildren(Node n)\r\n at System.Data.Entity.Core.Query.PlanCompiler.SubqueryTrackingVisitor.VisitRelOpDefault(RelOp op, Node n)\r\n at System.Data.Entity.Core.Query.PlanCompiler.PreProcessor.Visit(FilterOp op, Node n)\r\n at System.Data.Entity.Core.Query.PlanCompiler.SubqueryTrackingVisitor.VisitChildren(Node n)\r\n at System.Data.Entity.Core.Query.InternalTrees.BasicOpVisitorOfNode.VisitDefault(Node n)\r\n at System.Data.Entity.Core.Query.PlanCompiler.SubqueryTrackingVisitor.VisitChildren(Node n)\r\n at System.Data.Entity.Core.Query.PlanCompiler.PreProcessor.VisitScalarOpDefault(ScalarOp op, Node n)\r\n at System.Data.Entity.Core.Query.PlanCompiler.PreProcessor.VisitNavPropertyOp(PropertyOp op, Node n)\r\n at System.Data.Entity.Core.Query.PlanCompiler.PreProcessor.Visit(PropertyOp op, Node n)\r\n at System.Data.Entity.Core.Query.PlanCompiler.SubqueryTrackingVisitor.VisitChildren(Node n)\r\n at System.Data.Entity.Core.Query.PlanCompiler.PreProcessor.VisitScalarOpDefault(ScalarOp op, Node n)\r\n at System.Data.Entity.Core.Query.PlanCompiler.SubqueryTrackingVisitor.VisitChildren(Node n)\r\n at System.Data.Entity.Core.Query.InternalTrees.BasicOpVisitorOfNode.VisitDefault(Node n)\r\n at System.Data.Entity.Core.Query.PlanCompiler.SubqueryTrackingVisitor.VisitChildren(Node n)\r\n at System.Data.Entity.Core.Query.InternalTrees.BasicOpVisitorOfNode.VisitDefault(Node n)\r\n at System.Data.Entity.Core.Query.PlanCompiler.SubqueryTrackingVisitor.VisitChildren(Node n)\r\n at System.Data.Entity.Core.Query.PlanCompiler.SubqueryTrackingVisitor.VisitRelOpDefault(RelOp op, Node n)\r\n at System.Data.Entity.Core.Query.PlanCompiler.PreProcessor.Visit(ProjectOp op, Node n)\r\n at System.Data.Entity.Core.Query.PlanCompiler.SubqueryTrackingVisitor.VisitChildren(Node n)\r\n at System.Data.Entity.Core.Query.PlanCompiler.SubqueryTrackingVisitor.VisitRelOpDefault(RelOp op, Node n)\r\n at System.Data.Entity.Core.Query.PlanCompiler.PreProcessor.Visit(ProjectOp op, Node n)\r\n at System.Data.Entity.Core.Query.PlanCompiler.SubqueryTrackingVisitor.VisitChildren(Node n)\r\n at System.Data.Entity.Core.Query.InternalTrees.BasicOpVisitorOfNode.VisitDefault(Node n)\r\n at System.Data.Entity.Core.Query.PlanCompiler.PreProcessor.Process(Dictionary`2& tvfResultKeys)\r\n at System.Data.Entity.Core.Query.PlanCompiler.PreProcessor.Process(PlanCompiler planCompilerState, StructuredTypeInfo& typeInfo, Dictionary`2& tvfResultKeys)\r\n at System.Data.Entity.Core.Query.PlanCompiler.PlanCompiler.Compile(List`1& providerCommands, ColumnMap& resultColumnMap, Int32& columnCount, Set`1& entitySets)\r\n at System.Data.Entity.Core.EntityClient.Internal.EntityCommandDefinition..ctor(DbProviderFactory storeProviderFactory, DbCommandTree commandTree, DbInterceptionContext interceptionContext, IDbDependencyResolver resolver, BridgeDataReaderFactory bridgeDataReaderFactory, ColumnMapFactory columnMapFactory)"
}
}
编辑
我从一个新的数据库开始，对于任何实体我都得到相同的结果。这让我相信这与我的 DbContext 有关。看起来像这样：
public class SealingServerContext : DbContext
{
public SealingServerContext() : base("name=TFMContext")
{
this.Database.Log = Console.Write;
this.Configuration.LazyLoadingEnabled = false;
}
public DbSet<Organization> Organizations { get; set; }
public DbSet<User> Users { get; set; }
public DbSet<Role> Roles { get; set; }
public DbSet<ReviewerRole> ReviewerRoles { get; set; }
public DbSet<AnnotationTemplate> AnnotationTemplates { get; set; }
public DbSet<PaperItem> PaperItems { get; set; }
public DbSet<PaperRaster> PaperRasters { get; set; }
public DbSet<EngineerRole> EngineerRoles { get; set; }
public DbSet<Seal> Seals { get; set; }
public DbSet<Signature> Signatures { get; set; }
public DbSet<Job> Jobs { get; set; }
public DbSet<JobFile> JobFiles { get; set; }
public DbSet<Pdf> Pdfs { get; set; }
public DbSet<PdfPage> PdfPages { get; set; }
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Entity<AnnotationTemplate>()
.HasKey(annotationTemplate => annotationTemplate.ID);
modelBuilder.Entity<JobFile>()
.HasKey(pdf => pdf.ID);
modelBuilder.Entity<Pdf>()
.HasKey(pdf => pdf.ID)
.HasMany(pdf => pdf.PdfPages)
.WithRequired()
.HasForeignKey(pdfPage => pdfPage.Pdf_ID)
.WillCascadeOnDelete(true);
modelBuilder.Entity<Job>()
.HasKey(job => job.ID);
modelBuilder.Entity<Job>()
.HasMany(job => job.Files)
.WithRequired()
.HasForeignKey(jobFile => jobFile.Job_ID);
modelBuilder.Entity<Job>()
.HasMany(job => job.Regions)
.WithRequired()
.HasForeignKey(region => region.Job_ID);
modelBuilder.Entity<Organization>()
.HasKey(organization => organization.ID)
.HasMany(org => org.Users)
.WithRequired()
.HasForeignKey(user => user.Organization_ID);
modelBuilder.Entity<PaperItem>()
.HasKey(paperItem => paperItem.ID);
modelBuilder.Entity<PaperRaster>()
.HasKey(paperRaster => paperRaster.ID);
modelBuilder.Entity<Models.Files.PdfPage>()
.HasKey(pdfPage => pdfPage.ID);
modelBuilder.Entity<Region>()
.HasKey(region => region.ID);
modelBuilder.Entity<Role>()
.HasKey(role => role.ID);
modelBuilder.Entity<EngineerRole>()
.HasKey(role => role.ID);
modelBuilder.Entity<EngineerRole>()
.HasMany(engineerRole => engineerRole.Seals)
.WithRequired()
.HasForeignKey(seal => seal.EngineerRole_ID);
modelBuilder.Entity<EngineerRole>()
.HasMany(engineerRole => engineerRole.Signatures)
.WithRequired()
.HasForeignKey(signature => signature.EngineerRole_ID);
modelBuilder.Entity<EngineerAdminRole>()
.HasKey(role => role.ID);
modelBuilder.Entity<ReviewerAdminRole>()
.HasKey(role => role.ID);
modelBuilder.Entity<ReviewerRole>()
.HasKey(reviewerRole => reviewerRole.ID)
.HasMany(reviewerRole => reviewerRole.AnnotationTemplates)
.WithOptional()
.HasForeignKey(annotation => annotation.ReviewerRole_ID);
modelBuilder.Entity<Seal>()
.HasKey(seal => seal.ID);
modelBuilder.Entity<Signature>()
.HasKey(signature => signature.ID);
modelBuilder.Entity<User>()
.HasKey(user => user.ID);
modelBuilder.Entity<User>()
.HasMany(user => user.Roles)
.WithOptional()
.HasForeignKey(role => role.User_ID);
}
}
编辑2
我一直在注释掉一些内容并进行数据库迁移，并将其范围缩小到这个继承层次结构：
[KnownType(typeof(PaperRaster))]
public class PaperItem
{
public int ID { get; set; }
public PointF PdfPosition { get; set; }
public string ItemType { get; set; }
public virtual void Move(PointF coordinatesTranslation)
{
}
protected PaperItem(string paperItemType, PointF pdfPosition)
{
ItemType = paperItemType;
PdfPosition = pdfPosition;
}
public virtual PaperItem DeepCopy()
{
return new PaperItem("PaperItem", new PointF());
}
public virtual string ToJson()
{
//turn all of my properties into Json
return "";
}
}
及其子类：
public class PaperRaster : PaperItem
{
public string Source { get; set; }
public string CrossOrigin { get; set; }
public Matrix Matrix { get; set; }
public PaperRaster(string source, string crossOrigin, Matrix matrix, PointF pdfPosition)
: base("Raster", pdfPosition)
{
this.Source = source;
this.CrossOrigin = crossOrigin;
this.Matrix = matrix;
}
public PaperRaster(string json) : base("Raster", new PointF())
{
JArray array = JArray.Parse(json);
JToken type = array[0];
JToken properties = array[1];
JToken position = array[2]["pdfPosition"];
if (type.ToString() != "Raster")
{
throw new Exception("Not a PaperRaster");
}
var matrix = properties["matrix"];
this.Matrix = new Matrix(float.Parse(matrix[0].ToString()), float.Parse(matrix[1].ToString()),
float.Parse(matrix[2].ToString()), float.Parse(matrix[3].ToString()),
float.Parse(matrix[4].ToString()), float.Parse(matrix[5].ToString()));
// Custom encoded properties
// Bottom left point of annotation (that's how iTextSharp inserts it)
var x = position["x"].ToString();
var y = position["y"].ToString();
this.PdfPosition = new PointF()
{
X = float.Parse(x),
Y = float.Parse(y)
};
}
public override void Move(PointF coordinatesTranslation)
{
this.Matrix.Translate(coordinatesTranslation.X, coordinatesTranslation.Y);
}
public override PaperItem DeepCopy()
{
return new PaperRaster(this.Source, this.CrossOrigin, this.Matrix, this.PdfPosition);
}
public override string ToJson()
{
//turn all of my properties into Json
return "";
}
}
如果我注释掉子类并进行数据库迁移。一切都恢复正常工作。此继承层次结构中的什么原因导致 EF 错误地生成表
其他注意事项
奇怪的旁注，这样做有效：
var result = context.dbset.Single(x => x.ID == 10000);
但是像这样使用
Findvar result = context.dbset.Find(10000);
导致上面的错误。