public override void VisitGroupJoinClause(GroupJoinClause groupJoinClause, QueryModel queryModel, int index)
{
JoinClause joinClause = (JoinClause)groupJoinClause.JoinClause;
Type tOuter = queryModel.MainFromClause.ItemType;
Type tInner = joinClause.ItemType;
Type tOuterKey = joinClause.OuterKeySelector.Type;
Type tInnerKey = joinClause.InnerKeySelector.Type;
Type tIEnumerableInner = typeof(IEnumerable <>).MakeGenericType(tInner);
Type tResult = queryModel.SelectClause.Selector.Type;
ParameterExpression iEnumerableInnerParameter = Expression.Parameter(tIEnumerableInner, "d");
ParameterExpression outerParameter = Expression.Parameter(tOuter, "p");
ParameterExpression innerParameter = Expression.Parameter(tInner, "d");
ParameterExpression outerKeyParameter = Expression.Parameter(tOuter, "p");
Expression outerKey = UpdateExpressionVisitor.Update(joinClause.OuterKeySelector, new[] { outerKeyParameter }, dbContext, queryContext);
LambdaExpression outerKeyLamda = Expression.Lambda(outerKey, outerKeyParameter);
ParameterExpression tInnerKeyParameter = Expression.Parameter(tInner, "d");
Expression innerKey = UpdateExpressionVisitor.Update(joinClause.InnerKeySelector, new[] { tInnerKeyParameter }, dbContext, queryContext);
LambdaExpression innerKeyLamda = Expression.Lambda(innerKey, tInnerKeyParameter);
Expression selector = UpdateExpressionVisitor.Update(queryModel.SelectClause.Selector, new[] { outerParameter, iEnumerableInnerParameter }, dbContext, queryContext);
LambdaExpression selectorLambda = Expression.Lambda(selector, new[] { outerParameter, iEnumerableInnerParameter });
MethodInfo groupJoin = GetMethods("GroupJoin", expression.Type, 4).Where(p =>
p.GetParameters().Count() == 5).Single().
MakeGenericMethod(new Type[] { tOuter, tInner, tOuterKey, tResult });
expression = Expression.Call(groupJoin, new[] { expression, joinClause.InnerSequence, outerKeyLamda, innerKeyLamda, selectorLambda });
flagsNotVisitSelector = true;
}
public override void VisitSelectClause(SelectClause selectClause, QueryModel queryModel)
{
var genericTypeDefinition = expression.Type.GetGenericArguments();
if (flagsNotVisitSelector || (genericTypeDefinition.Count() == 1 && genericTypeDefinition.First().Equals(selectClause.Selector.Type)))
{
return;
}
Type sourceType = genericTypeDefinition.Count() == 1 ? genericTypeDefinition.First() : resultOptionType;
MethodInfo selectMethodInfo = typeof(IQueryable).IsAssignableFrom(expression.Type)
? QueryableMethodsHelper.Select
: EnumerableMethodsHelper.Select;
MemberExpression memberExpression = selectClause.Selector as MemberExpression;
if (memberExpression != null)
{
var parameter = Expression.Parameter(memberExpression.Expression.Type, "p");
memberExpression = (MemberExpression)UpdateExpressionVisitor.Update(memberExpression, new[] { parameter }, dbContext, queryContext);
var lambda = Expression.Lambda(memberExpression, parameter);
var genericMethodSelect = selectMethodInfo.MakeGenericMethod(memberExpression.Expression.Type, memberExpression.Type);
var call = Expression.Call(genericMethodSelect, expression, lambda);
expression = call;
return;
}
NewExpression newExpression = selectClause.Selector as NewExpression;
if (newExpression != null)
{
if (sourceType != null)
{
var parameter = Expression.Parameter(sourceType, "p");
List <Expression> updateArgExp = new List <Expression>();
foreach (var argument in newExpression.Arguments)
{
var update = UpdateExpressionVisitor.Update(argument, new[] { parameter }, dbContext, queryContext);
updateArgExp.Add(update);
}
Expression newResult = Expression.New(newExpression.Constructor, updateArgExp);
var selectGenericMethod = selectMethodInfo.MakeGenericMethod(sourceType, newResult.Type);
var lambda = Expression.Lambda(newResult, parameter);
var call = Expression.Call(selectGenericMethod, expression, lambda);
expression = call;
return;
}
}
if (sourceType != null)
{
var parameter = Expression.Parameter(sourceType, "p");
var update = UpdateExpressionVisitor.Update(selectClause.Selector, new[] { parameter }, dbContext, queryContext);
var selectGenericMethod = selectMethodInfo.MakeGenericMethod(sourceType, selectClause.Selector.Type);
var lambda = Expression.Lambda(update, parameter);
var call = Expression.Call(selectGenericMethod, expression, lambda);
expression = call;
return;
}
throw new NotImplementedException();
}
public override void VisitAdditionalFromClause(AdditionalFromClause fromClause, QueryModel queryModel, int index)
{
Type typeParameter = GetTypeParameter(fromClause.FromExpression);
ParameterExpression parameter = Expression.Parameter(typeParameter, "p");
Expression updateExpression = UpdateExpressionVisitor.Update(fromClause.FromExpression, new[] { parameter }, dbContext, queryContext);
updateExpression = Expression.Convert(updateExpression, typeof(IEnumerable <>).MakeGenericType(updateExpression.Type.GetGenericArguments()));
MethodInfo genericSelectMany = QueryableMethodsHelper.SelectMany.MakeGenericMethod(typeParameter, fromClause.ItemType);
LambdaExpression lambda = Expression.Lambda(updateExpression, parameter);
MethodCallExpression selectManyResult = Expression.Call(genericSelectMany, new[] { expression, lambda });
expression = selectManyResult;
}
//public override void VisitOrderByClause(OrderByClause orderByClause, QueryModel queryModel, int index) {
// throw new NotSupportedException();
//}
public override void VisitOrdering(Ordering ordering, QueryModel queryModel, OrderByClause orderByClause, int index)
{
ParameterExpression expressionParam = Expression.Parameter(entityType, "p");
Expression updateExpression = UpdateExpressionVisitor.Update(ordering.Expression, new[] { expressionParam }, dbContext, queryContext);
LambdaExpression expressionKeyLambda = Expression.Lambda(updateExpression, expressionParam);
if (ordering.OrderingDirection == OrderingDirection.Asc)
{
MethodInfo orderBy = GetMethod("OrderBy", expression.Type, 1).MakeGenericMethod(entityType, ordering.Expression.Type);
expression = Expression.Call(orderBy, new[] { expression, expressionKeyLambda });
}
else
{
MethodInfo orderByDescending = GetMethod("OrderByDescending", expression.Type, 1).MakeGenericMethod(entityType, ordering.Expression.Type);
expression = Expression.Call(orderByDescending, new[] { expression, expressionKeyLambda });
}
}
public override void VisitMainFromClause(MainFromClause fromClause, QueryModel queryModel)
{
bool processed = false;
expression = queryModel.MainFromClause.FromExpression;
if (expression is SubQueryExpression)
{
QueryModel subQueryModel = ((SubQueryExpression)expression).QueryModel;
VisitQueryModel(subQueryModel);
processed = true;
}
if (expression is ConstantExpression)
{
expression = Utility.DbContextHelper.GetDbSet(dbContext, (ConstantExpression)expression);
if (BaseSourceExpressionCreated != null)
{
BaseSourceExpressionCreatedEventArgs eventArgs = new BaseSourceExpressionCreatedEventArgs(expression, queryModel.MainFromClause.ItemType);
BaseSourceExpressionCreated(this, eventArgs);
expression = eventArgs.Expression;
}
processed = true;
}
if (expression is MemberExpression)
{
QuerySourceReferenceExpression querySourceReferenceExpression = (expression as MemberExpression)?.Expression as QuerySourceReferenceExpression;
if (querySourceReferenceExpression != null)
{
Type paramType = querySourceReferenceExpression.ReferencedQuerySource.ItemType;
string paramName = querySourceReferenceExpression.ReferencedQuerySource.ItemName;
MainParamerExpression = Expression.Parameter(paramType, paramName);
expression = UpdateExpressionVisitor.Update(expression, new[] { MainParamerExpression }, dbContext, queryContext);
processed = true;
}
}
if (expression is ParameterExpression)
{
processed = true; //TODO?
}
if (!processed)
{
throw new NotImplementedException();
}
entityType = queryModel.MainFromClause.ItemType;
selectorType = queryModel.SelectClause.Selector.Type;
}
public override void VisitResultOperator(ResultOperatorBase resultOperator, QueryModel queryModel, int index)
{
resultOptionType = resultOptionType ?? queryModel.SelectClause.Selector.Type;
if (resultOperator is CastResultOperator)
{
CastResultOperator castResultOperator = (CastResultOperator)resultOperator;
Type castType = castResultOperator.CastItemType;
MethodInfo cast = GetMethod("Cast", expression.Type).MakeGenericMethod(castType);
resultOptionType = castType;
expression = Expression.Call(cast, expression);
return;
}
if (resultOperator is AllResultOperator)
{
AllResultOperator allResultOperator = (AllResultOperator)resultOperator;
ParameterExpression parameterExpression = Expression.Parameter(selectorType, "p");
Expression predicateUpdate = UpdateExpressionVisitor.Update(allResultOperator.Predicate, new[] { parameterExpression }, dbContext, queryContext);
Expression allLamda = Expression.Lambda(predicateUpdate, parameterExpression);
MethodInfo all = GetMethod("All", expression.Type, 1).MakeGenericMethod(selectorType);
expression = Expression.Call(all, new[] { expression, allLamda });
return;
}
if (resultOperator is FirstResultOperator)
{
FirstResultOperator firstResultOperator = (FirstResultOperator)resultOperator;
if (firstResultOperator.ReturnDefaultWhenEmpty)
{
MethodInfo firstOrDefault = GetMethod("FirstOrDefault", expression.Type, 0).MakeGenericMethod(selectorType);
expression = Expression.Call(firstOrDefault, new[] { expression });
}
else
{
MethodInfo first = GetMethod("First", expression.Type, 0).MakeGenericMethod(selectorType);
expression = Expression.Call(first, new[] { expression });
}
return;
}
if (resultOperator is SingleResultOperator)
{
SingleResultOperator singleResultOperator = (SingleResultOperator)resultOperator;
if (singleResultOperator.ReturnDefaultWhenEmpty)
{
MethodInfo firstOrDefault = GetMethod("SingleOrDefault", expression.Type, 0).MakeGenericMethod(selectorType);
expression = Expression.Call(firstOrDefault, new[] { expression });
}
else
{
MethodInfo first = GetMethod("Single", expression.Type, 0).MakeGenericMethod(selectorType);
expression = Expression.Call(first, new[] { expression });
}
return;
}
if (resultOperator is AnyResultOperator)
{
MethodInfo any = GetMethod("Any", expression.Type).MakeGenericMethod(selectorType);
expression = Expression.Call(any, new[] { expression });
return;
}
if (resultOperator is TrackingResultOperator)
{
MethodInfo asNoTracking = typeof(EntityFrameworkQueryableExtensions).GetMethod("AsNoTracking").MakeGenericMethod(selectorType);
expression = Expression.Call(asNoTracking, new[] { expression });
return;
}
if (resultOperator is CountResultOperator)
{
MethodInfo count = GetMethod("Count", expression.Type).MakeGenericMethod(selectorType);
expression = Expression.Call(count, new[] { expression });
return;
}
if (resultOperator is AverageResultOperator)
{
MethodInfo average = GetAgregateMethod("Average", expression.Type, selectorType);
expression = Expression.Call(average, new[] { expression });
return;
}
if (resultOperator is ContainsResultOperator)
{
ContainsResultOperator containsResultOperator = (ContainsResultOperator)resultOperator;
Expression valExp;
object value;
ParameterExpression paramExp = containsResultOperator.Item as ParameterExpression;
if (paramExp != null &&
queryContext.ParameterValues.TryGetValue(paramExp.Name, out value))
{
valExp = Expression.Constant(value);
}
else
{
valExp = containsResultOperator.Item;
}
if (containsResultOperator.Item is SubQueryExpression)
{
SubQueryExpression subQueryExpression = (SubQueryExpression)containsResultOperator.Item;
QueryModelVisitor queryModelVisitor = new QueryModelVisitor(dbContext, queryContext);
queryModelVisitor.VisitQueryModel(subQueryExpression.QueryModel);
valExp = queryModelVisitor.expression;
}
MethodInfo contains = GetMethod("Contains", expression.Type, 1).MakeGenericMethod(selectorType);
expression = Expression.Call(contains, new[] { expression, valExp });
return;
}
if (resultOperator is DefaultIfEmptyResultOperator)
{
DefaultIfEmptyResultOperator defaultIfEmptyResultOperator = (DefaultIfEmptyResultOperator)resultOperator;
MethodInfo defaultIfEmpty;
if (defaultIfEmptyResultOperator.OptionalDefaultValue != null)
{
defaultIfEmpty = GetMethod("DefaultIfEmpty", expression.Type, 1).MakeGenericMethod(selectorType);
expression = Expression.Call(defaultIfEmpty, new[] { expression, defaultIfEmptyResultOperator.OptionalDefaultValue });
}
defaultIfEmpty = GetMethod("DefaultIfEmpty", expression.Type).MakeGenericMethod(selectorType);
expression = Expression.Call(defaultIfEmpty, expression);
return;
}
if (resultOperator is DistinctResultOperator)
{
MethodInfo distinct = GetMethod("Distinct", expression.Type).MakeGenericMethod(selectorType);
expression = Expression.Call(distinct, expression);
return;
}
if (resultOperator is GroupResultOperator)
{
GroupResultOperator groupResultOperator = (GroupResultOperator)resultOperator;
Type keySelectorType = GetTypeParameter(groupResultOperator.KeySelector);
ParameterExpression keyExpressionParam = Expression.Parameter(keySelectorType, "p");
Expression keyExpression = UpdateExpressionVisitor.Update(groupResultOperator.KeySelector, new[] { keyExpressionParam }, dbContext, queryContext);
LambdaExpression keyLambdaExpression = Expression.Lambda(keyExpression, keyExpressionParam);
Type elementSelectorType = GetTypeParameter(groupResultOperator.ElementSelector);
ParameterExpression ElementExpressionParam = Expression.Parameter(elementSelectorType, "p");
Expression ElementExpression = UpdateExpressionVisitor.Update(groupResultOperator.ElementSelector, new[] { ElementExpressionParam }, dbContext, queryContext);
LambdaExpression ElementLambdaExpression = Expression.Lambda(ElementExpression, ElementExpressionParam);
Type tSource = queryModel.MainFromClause.ItemType;
Type tKey = keyExpression.Type;
Type tElement = ElementExpression.Type;
Type tResult = queryModel.ResultTypeOverride;
MethodInfo groupBy = GetMethods("GroupBy", expression.Type, 2).Where(p => p.GetParameters()[2].Name == "elementSelector").Single().
MakeGenericMethod(tSource, tKey, tElement);
expression = Expression.Call(groupBy, new[] { expression, keyLambdaExpression, ElementLambdaExpression });
return;
}
if (resultOperator is LastResultOperator)
{
LastResultOperator lastResultOperator = (LastResultOperator)resultOperator;
if (lastResultOperator.ReturnDefaultWhenEmpty)
{
MethodInfo lastOrDefault = GetMethod("LastOrDefault", expression.Type, 0).MakeGenericMethod(selectorType);
expression = Expression.Call(lastOrDefault, new[] { expression });
}
else
{
MethodInfo last = GetMethod("Last", expression.Type, 0).MakeGenericMethod(selectorType);
expression = Expression.Call(last, new[] { expression });
}
return;
}
if (resultOperator is LongCountResultOperator)
{
MethodInfo longCount = GetMethod("LongCount", expression.Type).MakeGenericMethod(selectorType);
expression = Expression.Call(longCount, new[] { expression });
return;
}
if (resultOperator is MaxResultOperator)
{
MethodInfo max = GetMethod("Max", expression.Type).MakeGenericMethod(selectorType);
expression = Expression.Call(max, expression);
return;
}
if (resultOperator is MinResultOperator)
{
MethodInfo min = GetMethod("Min", expression.Type).MakeGenericMethod(selectorType);
expression = Expression.Call(min, expression);
return;
}
if (resultOperator is SumResultOperator)
{
MethodInfo sum = GetAgregateMethod("Sum", expression.Type, selectorType);
expression = Expression.Call(sum, expression);
return;
}
if (resultOperator is SkipResultOperator)
{
SkipResultOperator skipResultOperator = (SkipResultOperator)resultOperator;
Expression expVal;
object value;
ParameterExpression paramExp = skipResultOperator.Count as ParameterExpression;
if (paramExp != null &&
queryContext.ParameterValues.TryGetValue(paramExp.Name, out value))
{
expVal = Expression.Constant(value);
}
else
{
expVal = skipResultOperator.Count;
}
MethodInfo skip = GetMethod("Skip", expression.Type, 1).MakeGenericMethod(selectorType);
expression = Expression.Call(skip, new[] { expression, expVal });
return;
}
if (resultOperator is TakeResultOperator)
{
TakeResultOperator takeResultOperator = (TakeResultOperator)resultOperator;
Expression expVal;
object value;
ParameterExpression paramExp = takeResultOperator.Count as ParameterExpression;
if (paramExp != null &&
queryContext.ParameterValues.TryGetValue(paramExp.Name, out value))
{
expVal = Expression.Constant(value);
}
else
{
expVal = takeResultOperator.Count;
}
MethodInfo take = GetMethod("Take", expression.Type, 1).MakeGenericMethod(selectorType);
expression = Expression.Call(take, new[] { expression, expVal });
return;
}
if (resultOperator is IncludeResultOperator)
{
IncludeResultOperator includeResultOperator = (IncludeResultOperator)resultOperator;
Expression includeExpression = includeResultOperator.NavigationPropertyPath;
Type paramExpressionType = null;
ParameterExpression parameterExpression = null;
if (includeExpression is MemberExpression)
{
MemberExpression memberExpression = (MemberExpression)includeExpression;
paramExpressionType = memberExpression.Expression.Type;
parameterExpression = Expression.Parameter(paramExpressionType, "p");
includeExpression = Expression.Property(parameterExpression, memberExpression.Member.Name);
}
else
{
paramExpressionType = GetTypeParameter(includeExpression);
parameterExpression = Expression.Parameter(paramExpressionType, "p");
}
Expression updateOuterExpression = UpdateExpressionVisitor.Update(includeExpression, new[] { parameterExpression }, dbContext, queryContext);
LambdaExpression lambdaIncludeExpression = Expression.Lambda(updateOuterExpression, parameterExpression);
MethodInfo include = typeof(EntityFrameworkQueryableExtensions).GetMethods().First(m => m.Name == "Include").MakeGenericMethod(selectorType, updateOuterExpression.Type);
expression = Expression.Call(include, new[] { expression, lambdaIncludeExpression });
if (includeResultOperator.ChainedNavigationProperties != null)
{
foreach (PropertyInfo propertyInfo in includeResultOperator.ChainedNavigationProperties)
{
Type propertyType = propertyInfo.PropertyType;
Type argument = expression.Type.GetGenericArguments().Last();
MethodInfo thenInclude;
Type realType;
if (typeof(IEnumerable).IsAssignableFrom(argument))
{
realType = argument.GetGenericArguments().First();
thenInclude = ThenIncludeCollection.MakeGenericMethod(includeResultOperator.QuerySource.ItemType, realType, propertyType);
}
else
{
realType = argument;
thenInclude = ThenIncludeProperty.MakeGenericMethod(includeResultOperator.QuerySource.ItemType, realType, propertyType);
}
ParameterExpression parameterThenIncludeExpression = Expression.Parameter(realType, "p");
MemberExpression property = Expression.Property(parameterThenIncludeExpression, propertyInfo);
LambdaExpression lambdaThenIncludeExpression = Expression.Lambda(property, parameterThenIncludeExpression);
expression = Expression.Call(thenInclude, new[] { expression, lambdaThenIncludeExpression });
}
}
return;
}
if (resultOperator is OfTypeResultOperator)
{
OfTypeResultOperator ofTypeResultOperator = (OfTypeResultOperator)resultOperator;
selectorType = ofTypeResultOperator.SearchedItemType;
var miOfType = GetMethod("OfType", expression.Type).MakeGenericMethod(ofTypeResultOperator.SearchedItemType);
expression = Expression.Call(miOfType, new[] { expression });
return;
}
throw new NotSupportedException();
}