Class DataContextQueryProvider

A data context query provider base.

Inheritance

System.Object

DataContextQueryProvider

LLBLGenQueryProvider

MongoQueryProvider

Implements

IDataContextQueryProvider

IAsyncQueryProvider

System.Linq.IQueryProvider

Inherited Members

System.Object.Equals(System.Object)

System.Object.Equals(System.Object, System.Object)

System.Object.GetHashCode()

System.Object.GetType()

System.Object.MemberwiseClone()

System.Object.ReferenceEquals(System.Object, System.Object)

System.Object.ToString()

Namespace: Kephas.Data.Linq

Assembly: Kephas.Data.dll

Syntax

public class DataContextQueryProvider : IDataContextQueryProvider, IAsyncQueryProvider, IQueryProvider

Constructors

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DataContextQueryProvider(IQueryOperationContext, IQueryProvider)

Initializes a new instance of the DataContextQueryProvider class.

Declaration

public DataContextQueryProvider(IQueryOperationContext queryOperationContext, IQueryProvider nativeQueryProvider)

Parameters

Type	Name	Description
IQueryOperationContext	queryOperationContext	The query operation context.
System.Linq.IQueryProvider	nativeQueryProvider	The native query provider.

Properties

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DataContext

Gets the bound data context.

Declaration

public IDataContext DataContext { get; }

Property Value

Type	Description
IDataContext	The bound data context.

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NativeQueryProvider

Gets the native query provider.

Declaration

public IQueryProvider NativeQueryProvider { get; }

Property Value

Type	Description
System.Linq.IQueryProvider	The native query provider.

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QueryOperationContext

Gets an operation context for the query.

Declaration

public IQueryOperationContext QueryOperationContext { get; }

Property Value

Type	Description
IQueryOperationContext	The query operation context.

Methods

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AttachEntitiesToDataContext<TResult>(TResult)

Attach entities to data context.

Declaration

protected virtual TResult AttachEntitiesToDataContext<TResult>(TResult executionResult)

Parameters

Type	Name	Description
TResult	executionResult	The execution result.

Returns

Type	Description
TResult	The result containing attached entities.

Type Parameters

Name	Description
TResult	The type of the value that results from executing the query.

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AttachEntityCollection<TResult, T>(TResult)

Attaches an entity collection.

Declaration

protected TResult AttachEntityCollection<TResult, T>(TResult executionResult)

    where TResult : IEnumerable<T>

Parameters

Type	Name	Description
TResult	executionResult	The execution result.

Returns

Type	Description
TResult	A list of attached entities.

Type Parameters

Name	Description
TResult	Type of the result.
T	The entity type.

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CreateQuery(Expression)

Constructs an System.Linq.IQueryable object that can evaluate the query represented by a specified expression tree.

Declaration

public virtual IQueryable CreateQuery(Expression expression)

Parameters

Type	Name	Description
System.Linq.Expressions.Expression	expression	An expression tree that represents a LINQ query.

Returns

Type	Description
System.Linq.IQueryable	An System.Linq.IQueryable that can evaluate the query represented by the specified expression tree.

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CreateQuery<TElement>(Expression)

Constructs an System.Linq.IQueryable<T> object that can evaluate the query represented by a specified expression tree.

Declaration

public virtual IQueryable<TElement> CreateQuery<TElement>(Expression expression)

Parameters

Type	Name	Description
System.Linq.Expressions.Expression	expression	An expression tree that represents a LINQ query.

Returns

Type	Description
System.Linq.IQueryable<TElement>	An System.Linq.IQueryable<T> that can evaluate the query represented by the specified expression tree.

Type Parameters

Name	Description
TElement	The type of the elements of the System.Linq.IQueryable<T> that is returned.

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CreateQuery<TElement>(IQueryable<TElement>)

Constructs an System.Linq.IQueryable object that can evaluate the query represented by a specified expression tree.

Declaration

protected virtual IQueryable<TElement> CreateQuery<TElement>(IQueryable<TElement> nativeQuery)

Parameters

Type	Name	Description
System.Linq.IQueryable<TElement>	nativeQuery	The native query.

Returns

Type	Description
System.Linq.IQueryable<TElement>	An System.Linq.IQueryable that can evaluate the query represented by the specified expression tree.

Type Parameters

Name	Description
TElement	The query element type.

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CreateQueryExpressionVisitor(Func<Type, IContext, Type>, IActivator)

Creates an expression visitor used to visit the query expression.

Declaration

protected virtual ExpressionVisitor CreateQueryExpressionVisitor(Func<Type, IContext, Type> implementationTypeResolver, IActivator activator)

Parameters

Type	Name	Description
System.Func<System.Type, IContext, System.Type>	implementationTypeResolver	The implementation type resolver.
IActivator	activator	The activator.

Returns

Type	Description
System.Linq.Expressions.ExpressionVisitor	The new query expression visitor.

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Execute(Expression)

Executes the query represented by a specified expression tree.

Declaration

public virtual object Execute(Expression expression)

Parameters

Type	Name	Description
System.Linq.Expressions.Expression	expression	An expression tree that represents a LINQ query.

Returns

Type	Description
System.Object	The value that results from executing the specified query.

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Execute<TResult>(Expression)

Executes the strongly-typed query represented by a specified expression tree.

Declaration

public virtual TResult Execute<TResult>(Expression expression)

Parameters

Type	Name	Description
System.Linq.Expressions.Expression	expression	An expression tree that represents a LINQ query.

Returns

Type	Description
TResult	The value that results from executing the specified query.

Type Parameters

Name	Description
TResult	The type of the value that results from executing the query.

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ExecuteAsync(Expression, CancellationToken)

Asynchronously executes the query represented by a specified expression tree.

Declaration

public virtual Task<object> ExecuteAsync(Expression expression, CancellationToken cancellationToken = default(CancellationToken))

Parameters

Type	Name	Description
System.Linq.Expressions.Expression	expression	An expression tree that represents a LINQ query.
System.Threading.CancellationToken	cancellationToken	A System.Threading.CancellationToken to observe while waiting for the task to complete.

Returns

Type	Description
System.Threading.Tasks.Task<System.Object>	A task that represents the asynchronous operation. The task result contains the value that results from executing the specified query.

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ExecuteAsync<TResult>(Expression, CancellationToken)

Asynchronously executes the strongly-typed query represented by a specified expression tree.

Declaration

public virtual Task<TResult> ExecuteAsync<TResult>(Expression expression, CancellationToken cancellationToken = default(CancellationToken))

Parameters

Type	Name	Description
System.Linq.Expressions.Expression	expression	An expression tree that represents a LINQ query.
System.Threading.CancellationToken	cancellationToken	A System.Threading.CancellationToken to observe while waiting for the task to complete.

Returns

Type	Description
System.Threading.Tasks.Task<TResult>	A task that represents the asynchronous operation. The task result contains the value that results from executing the specified query.

Type Parameters

Name	Description
TResult	The type of the value that results from executing the query.

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GetExecutableExpression(Expression)

Prepares the provided expression for execution.

Declaration

protected virtual Expression GetExecutableExpression(Expression expression)

Parameters

Type	Name	Description
System.Linq.Expressions.Expression	expression	An expression tree that represents a LINQ query.

Returns

Type	Description
System.Linq.Expressions.Expression	An expression prepared for execution.

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IsAttachable(Object)

Indicates whether an entity is attachable.

Declaration

protected virtual bool IsAttachable(object entity)

Parameters

Type	Name	Description
System.Object	entity	The entity.

Returns

Type	Description
System.Boolean	True if the entity is attachable, false if not.

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IsAttachableType(Type)

Indicates whether an entity type is attachable.

Declaration

protected virtual bool IsAttachableType(Type entityType)

Parameters

Type	Name	Description
System.Type	entityType	The entity type.

Returns

Type	Description
System.Boolean	True if the entity type is attachable, false if not.

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ToExecutionResult<TResult, T>(IList<T>)

Converts the list of attached entities to an execution result.

Declaration

protected virtual TResult ToExecutionResult<TResult, T>(IList<T> attachedList)

    where TResult : IEnumerable<T>

Parameters

Type	Name	Description
System.Collections.Generic.IList<T>	attachedList	List of attached entities.

Returns

Type	Description
TResult	The attached entity list as a TResult.

Type Parameters

Name	Description
TResult	Type of the result.
T	The item type.

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TryGetEntityActivator()

Tries to get the data context's entity activator.

Declaration

protected virtual IActivator TryGetEntityActivator()

Returns

Type	Description
IActivator	An IActivator.

Implements

IDataContextQueryProvider

IAsyncQueryProvider

System.Linq.IQueryProvider

Extension Methods

DynamicObjectExtensions.SetPropertyValue(Object, String, Object)

DynamicObjectExtensions.TrySetPropertyValue(Object, String, Object)

DynamicObjectExtensions.GetPropertyValue(Object, String)

DynamicObjectExtensions.TryGetPropertyValue(Object, String, out Object)

DynamicObjectExtensions.GetRuntimeTypeInfo(Object)

DynamicObjectExtensions.ToDynamic(Object)

DynamicObjectExtensions.ToExpando(Object)

BehaviorValue.ToBehaviorValue<TValue>(TValue)

CollectionExtensions.AddRange<T, TItem>(T, IEnumerable<TItem>)

LoggingExtensions.GetLogger(Object, IContext)

TypeExtensions.GetAbstractType(Object)

TypeExtensions.GetAbstractTypeInfo(Object)

ReflectionHelper.GetTypeInfo(Object)

EntityEntryExtensions.TryGetAttachedEntityEntry(Object)