private static MemberAssignment GetCollectionNavigationExpression(Type sourcePropertyType, Type destinationPropertyType, Expression parameterExpression, PropertyInfo sourceProperty, MemberInfo destinationProperty, DbContext context)
{
// Prepare the inner lambda expression for the select statement
sourcePropertyType = sourcePropertyType.GenericTypeArguments[0];
destinationPropertyType = destinationPropertyType.GenericTypeArguments[0];
var childSourceProperties = sourcePropertyType.GetProperties();
var destinationProperties = destinationPropertyType.GetProperties().Where(dest => dest.CanWrite);
var selectParameterExpression = Expression.Parameter(sourcePropertyType);
var bindings = GetBindings(destinationProperties, selectParameterExpression, destinationProperty, childSourceProperties, context);
MemberInitExpression propertyInit = Expression.MemberInit(Expression.New(destinationPropertyType), bindings);
Type function = typeof(Func <,>).MakeGenericType(sourcePropertyType, destinationPropertyType);
// (t) => new T() { Property = t.Property, ... }
LambdaExpression lambda = Expression.Lambda(function, propertyInit, selectParameterExpression);
MemberExpression collection = Expression.Property(parameterExpression, sourceProperty);
IEnumerable <string> a = new List <string>();
// p.Select(t => new T() { Property = t.Property, ... })
Expression selectExpression = collection.CallSelect(lambda, destinationPropertyType);
// Create select predicate
return(Expression.Bind(destinationProperty, selectExpression));
}
