protected override Expression VisitEntitySetExpression(EntitySetExpression expression)
{
var tupleExpression = GetTupleExpression(expression);
var materializedEntitySetExpression = MaterializeThroughOwner(expression, tupleExpression);
var prefetechMethodInfo = MaterializationHelper.PrefetchEntitySetMethodInfo
.MakeGenericMethod(expression.Type);
var prefetchEntitySetExpression = Expression.Call(
prefetechMethodInfo,
materializedEntitySetExpression,
itemMaterializationContextParameter);
return(prefetchEntitySetExpression);
}
/// <summary>
/// Creates an entity set creator, to be used at run-time
/// </summary>
/// <param name="expression"></param>
/// <param name="dataRecordParameter"></param>
/// <param name="mappingContextParameter"></param>
/// <param name="builderContext"></param>
/// <returns></returns>
protected virtual Expression GetEntitySetBuilder(EntitySetExpression expression,
ParameterExpression dataRecordParameter, ParameterExpression mappingContextParameter,
BuilderContext builderContext)
{
var entityType = expression.EntitySetType.GetGenericArguments()[0];
List <ElementInit> members = new List <ElementInit>();
var add = expression.EntitySetType.GetMethod("Add",
BindingFlags.NonPublic | BindingFlags.Instance,
null,
new Type[] { typeof(KeyValuePair <object, MemberInfo>) },
null);
foreach (var info in expression.Columns)
{
var column = info.Key;
var tk = info.Value;
MemberInfo memberInfo = column.StorageInfo ?? column.MemberInfo;
PropertyInfo propertyInfo = memberInfo as PropertyInfo;
if (propertyInfo == null || propertyInfo.CanWrite)
{
var parameterColumn = GetOutputValueReader(column,
dataRecordParameter, mappingContextParameter, builderContext);
members.Add(Expression.ElementInit(add,
new Expression[]
{
Expression.New(typeof(KeyValuePair <object, MemberInfo>).GetConstructor(new Type[] { typeof(object), typeof(MemberInfo) }),
Expression.Convert(parameterColumn, typeof(object)),
Expression.Constant(tk.Member, typeof(MemberInfo)))
}));
}
}
return(Expression.ListInit(
Expression.New(
expression.EntitySetType.GetConstructor(
BindingFlags.NonPublic | BindingFlags.Instance,
null,
new[] { typeof(DataContext) },
null),
Expression.Constant(builderContext.QueryContext.DataContext)),
members));
}
protected override Expression VisitEntitySetExpression(EntitySetExpression expression)
{
return(expression);
}
protected override Expression VisitEntitySetExpression(EntitySetExpression es)
{
VisitEntityExpression((EntityExpression)es.Owner);
return(es);
}
protected virtual Expression VisitEntitySetExpression(EntitySetExpression expression)
{
return(expression);
}
