public virtual Expression CreateMaterializeExpression(
IEntityType entityType,
string entityInstanceName,
Expression materializationContextExpression)
{
if (!entityType.HasClrType())
{
throw new InvalidOperationException(CoreStrings.NoClrType(entityType.DisplayName()));
}
if (entityType.IsAbstract())
{
throw new InvalidOperationException(CoreStrings.CannotMaterializeAbstractType(entityType));
}
var constructorBinding = (InstantiationBinding)entityType[CoreAnnotationNames.ConstructorBinding];
if (constructorBinding == null)
{
var constructorInfo = entityType.ClrType.GetDeclaredConstructor(null);
if (constructorInfo == null)
{
throw new InvalidOperationException(CoreStrings.NoParameterlessConstructor(entityType.DisplayName()));
}
constructorBinding = new ConstructorBinding(constructorInfo, Array.Empty <ParameterBinding>());
}
var bindingInfo = new ParameterBindingInfo(
entityType,
materializationContextExpression);
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 valueBufferExpression = Expression.Call(materializationContextExpression, MaterializationContext.GetValueBufferMethod);
foreach (var property in properties)
{
var memberInfo = property.GetMemberInfo(forMaterialization: true, forSet: true);
var readValueExpression
= property is IServiceProperty serviceProperty
? serviceProperty.GetParameterBinding().BindToParameter(bindingInfo)
: CreateReadValueExpression(
valueBufferExpression,
memberInfo.GetMemberType(),
property.GetIndex(),
property);
blockExpressions.Add(
Expression.MakeMemberAccess(
instanceVariable,
memberInfo).Assign(
readValueExpression));
}
blockExpressions.Add(instanceVariable);
return(Expression.Block(
new[]
{
instanceVariable
}, blockExpressions));
}
