Class NullExpression

Namespace

Cratis.Chronicle.Projections.Engine.Expressions

Assembly

Cratis.Chronicle.dll

Represents a IEventValueExpression for clearing a member back to no value.

public class NullExpression : IEventValueExpression

Inheritance

object

NullExpression

Implements

IEventValueExpression

Inherited Members

object.GetType()

object.MemberwiseClone()

object.ToString()

object.Equals(object)

object.Equals(object, object)

object.ReferenceEquals(object, object)

object.GetHashCode()

Extension Methods

MethodCalls.CallGenericMethod<TOut, T>(T, Expression<Func<T, Func<TOut>>>, params Type[])

MethodCalls.CallGenericMethod<TOut, T, T1>(T, Expression<Func<T, Func<T1, TOut>>>, T1, params Type[])

MethodCalls.CallGenericMethod<TOut, T, T1, T2>(T, Expression<Func<T, Func<T1, T2, TOut>>>, T1, T2, params Type[])

MethodCalls.CallGenericMethod<TOut, T, T1, T2, T3>(T, Expression<Func<T, Func<T1, T2, T3, TOut>>>, T1, T2, T3, params Type[])

ConverterExtensions.ConvertTo(object, Type)

ConceptExtensions.GetConceptValue(object)

ConceptExtensions.IsConcept(object)

JsonValueExtensions.ToJsonValue(object?)

ObservableExtensions.InvokeAndWrapWithSubject<TResult>(object, Func<CancellationToken, IObservable<TResult>>)

ObservableExtensions.InvokeAndWrapWithTransformSubject<TResult, TSource>(object, Func<CancellationToken, IObservable<TSource>>, Func<TSource, TResult>)

Remarks

A clear is its own expression rather than a ValueExpression carrying the text of the keyword. The kernel captures a constant's operand as text, so routing a clear through $value(...) wrote those literal four characters into the member instead of clearing it.

Constructors

NullExpression()

public NullExpression()

Fields

Instance

Gets the single NullExpression instance - it carries no state.

public static readonly NullExpression Instance

Field Value

NullExpression

Methods

Build()

Builds the expression.

public PropertyExpression Build()

Returns

PropertyExpression

The expression built.