/// <summary>
/// This is an internal API that supports the Entity Framework Core infrastructure and not subject to
/// the same compatibility standards as public APIs. It may be changed or removed without notice in
/// any release. You should only use it directly in your code with extreme caution and knowing that
/// doing so can result in application failures when updating to a new Entity Framework Core release.
/// </summary>
public virtual Expression CreateMaterializeExpression(
IEntityType entityType,
string entityInstanceName,
Expression materializationExpression,
int[] indexMap = null)
{
if (!entityType.HasClrType())
{
throw new InvalidOperationException(CoreStrings.NoClrType(entityType.DisplayName()));
}
if (entityType.IsAbstract())
{
throw new InvalidOperationException(CoreStrings.CannotMaterializeAbstractType(entityType));
}
var constructorBinding = (ConstructorBinding)entityType[CoreAnnotationNames.ConstructorBinding];
if (constructorBinding == null)
{
var constructorInfo = entityType.ClrType.GetDeclaredConstructor(null);
if (constructorInfo == null)
{
throw new InvalidOperationException(CoreStrings.NoParameterlessConstructor(entityType.DisplayName()));
}
constructorBinding = new DirectConstructorBinding(constructorInfo, Array.Empty <ParameterBinding>());
}
// This is to avoid breaks because this method used to expect ValueBuffer but now expects MaterializationContext
var valueBufferExpression = materializationExpression;
if (valueBufferExpression.Type == typeof(MaterializationContext))
{
valueBufferExpression = Expression.Call(materializationExpression, MaterializationContext.GetValueBufferMethod);
}
else
{
materializationExpression = Expression.New(MaterializationContext.ObsoleteConstructor, materializationExpression);
}
var bindingInfo = new ParameterBindingInfo(
entityType,
materializationExpression,
indexMap);
var properties = new HashSet <IPropertyBase>(
entityType.GetServiceProperties().Cast <IPropertyBase>()
.Concat(
entityType
.GetProperties()
.Where(p => !p.IsShadowProperty())));
foreach (var consumedProperty in constructorBinding
.ParameterBindings
.SelectMany(p => p.ConsumedProperties))
{
properties.Remove(consumedProperty);
}
var constructorExpression = constructorBinding.CreateConstructorExpression(bindingInfo);
if (properties.Count == 0)
{
return(constructorExpression);
}
var instanceVariable = Expression.Variable(constructorBinding.RuntimeType, entityInstanceName);
var blockExpressions
= new List <Expression>
{
Expression.Assign(
instanceVariable,
constructorExpression)
};
var indexerPropertyInfo = entityType.FindIndexerProperty();
foreach (var property in properties)
{
var memberInfo = property.GetMemberInfo(forConstruction: true, forSet: true);
var readValueExpression
= property is IServiceProperty serviceProperty
? serviceProperty.GetParameterBinding().BindToParameter(bindingInfo)
: CreateReadValueExpression(
valueBufferExpression,
memberInfo.GetMemberType(),
indexMap?[property.GetIndex()] ?? property.GetIndex(),
property);
blockExpressions.Add(
property.IsIndexedProperty()
? Expression.Assign(
Expression.MakeIndex(
instanceVariable,
indexerPropertyInfo,
new[]
{
Expression.Constant(property.Name)
}),
readValueExpression)
: Expression.MakeMemberAccess(
instanceVariable,
memberInfo).Assign(
readValueExpression));
}
blockExpressions.Add(instanceVariable);
return(Expression.Block(
new[]
{
instanceVariable
}, blockExpressions));
}
