public override Expression Visit(Expression expression)
{
if (expression == null)
{
return(null);
}
if (!(expression is NewExpression ||
expression is MemberInitExpression ||
expression is EntityShaperExpression ||
expression is IncludeExpression))
{
// This skips the group parameter from GroupJoin
if (expression is ParameterExpression parameter &&
parameter.Type.IsGenericType &&
parameter.Type.GetGenericTypeDefinition() == typeof(IEnumerable <>))
{
return(parameter);
}
if (_clientEval)
{
switch (expression)
{
case ConstantExpression _:
return(expression);
case ParameterExpression parameterExpression:
return(Expression.Call(
_getParameterValueMethodInfo.MakeGenericMethod(parameterExpression.Type),
QueryCompilationContext.QueryContextParameter,
Expression.Constant(parameterExpression.Name)));
case MaterializeCollectionNavigationExpression materializeCollectionNavigationExpression:
return(_selectExpression.AddCollectionProjection(
_queryableMethodTranslatingExpressionVisitor.TranslateSubquery(
materializeCollectionNavigationExpression.Subquery),
materializeCollectionNavigationExpression.Navigation, null));
case MethodCallExpression methodCallExpression:
{
if (methodCallExpression.Method.IsGenericMethod &&
methodCallExpression.Method.DeclaringType == typeof(Enumerable) &&
methodCallExpression.Method.Name == nameof(Enumerable.ToList))
{
var elementType = methodCallExpression.Method.GetGenericArguments()[0];
var result = _queryableMethodTranslatingExpressionVisitor.TranslateSubquery(methodCallExpression.Arguments[0]);
return(_selectExpression.AddCollectionProjection(result, null, elementType));
}
var subquery = _queryableMethodTranslatingExpressionVisitor.TranslateSubquery(methodCallExpression);
if (subquery != null)
{
if (subquery.ResultCardinality == ResultCardinality.Enumerable)
{
return(_selectExpression.AddCollectionProjection(subquery, null, subquery.ShaperExpression.Type));
}
public override Expression Visit(Expression expression)
{
if (expression == null)
{
return(null);
}
if (!(expression is NewExpression ||
expression is MemberInitExpression ||
expression is EntityShaperExpression ||
expression is IncludeExpression))
{
// This skips the group parameter from GroupJoin
if (expression is ParameterExpression parameter &&
parameter.Type.IsGenericType &&
parameter.Type.GetGenericTypeDefinition() == typeof(IEnumerable <>))
{
return(parameter);
}
if (_clientEval)
{
if (expression is ConstantExpression)
{
return(expression);
}
if (expression is ParameterExpression parameterExpression)
{
return(Expression.Call(
_getParameterValueMethodInfo.MakeGenericMethod(parameterExpression.Type),
QueryCompilationContext.QueryContextParameter,
Expression.Constant(parameterExpression.Name)));
}
if (expression is MethodCallExpression methodCallExpression &&
methodCallExpression.Method.Name == "MaterializeCollectionNavigation")
{
var result = _queryableMethodTranslatingExpressionVisitor.TranslateSubquery(methodCallExpression.Arguments[0]);
var navigation = (INavigation)((ConstantExpression)methodCallExpression.Arguments[1]).Value;
return(_selectExpression.AddCollectionProjection(result, navigation));
}
var translation = _sqlTranslator.Translate(expression);
if (translation == null)
{
return(base.Visit(expression));
}
else
{
return(new ProjectionBindingExpression(_selectExpression, _selectExpression.AddToProjection(translation), expression.Type));
}
}
else
{
var translation = _sqlTranslator.Translate(expression);
if (translation == null)
{
return(null);
}
_projectionMapping[_projectionMembers.Peek()] = translation;
return(new ProjectionBindingExpression(_selectExpression, _projectionMembers.Peek(), expression.Type));
}
}
return(base.Visit(expression));
}
public override Expression?Visit(Expression?expression)
{
if (expression == null)
{
return(null);
}
if (!(expression is NewExpression ||
expression is MemberInitExpression ||
expression is EntityShaperExpression ||
expression is IncludeExpression))
{
// This skips the group parameter from GroupJoin
if (expression is ParameterExpression parameter &&
parameter.Type.IsGenericType &&
parameter.Type.GetGenericTypeDefinition() == typeof(IEnumerable <>))
{
return(parameter);
}
if (_clientEval)
{
switch (expression)
{
case ConstantExpression _:
return(expression);
case ProjectionBindingExpression projectionBindingExpression:
if (projectionBindingExpression.Index is int index)
{
var newIndex = _selectExpression.AddToProjection(_existingProjections[index]);
return(new ProjectionBindingExpression(_selectExpression, newIndex, expression.Type));
}
if (projectionBindingExpression.ProjectionMember != null)
{
// This would be SqlExpression. EntityProjectionExpression would be wrapped inside EntityShaperExpression.
var mappedProjection = (SqlExpression)((SelectExpression)projectionBindingExpression.QueryExpression)
.GetMappedProjection(projectionBindingExpression.ProjectionMember);
return(new ProjectionBindingExpression(
_selectExpression, _selectExpression.AddToProjection(mappedProjection), expression.Type));
}
throw new InvalidOperationException(CoreStrings.TranslationFailed(projectionBindingExpression.Print()));
case ParameterExpression parameterExpression:
if (parameterExpression.Name?.StartsWith(QueryCompilationContext.QueryParameterPrefix, StringComparison.Ordinal)
== true)
{
return(Expression.Call(
_getParameterValueMethodInfo.MakeGenericMethod(parameterExpression.Type),
QueryCompilationContext.QueryContextParameter,
Expression.Constant(parameterExpression.Name)));
}
throw new InvalidOperationException(CoreStrings.TranslationFailed(parameterExpression.Print()));
case MaterializeCollectionNavigationExpression materializeCollectionNavigationExpression:
return(_selectExpression.AddCollectionProjection(
_queryableMethodTranslatingExpressionVisitor.TranslateSubquery(
materializeCollectionNavigationExpression.Subquery) !,
materializeCollectionNavigationExpression.Navigation,
materializeCollectionNavigationExpression.Navigation.ClrType.TryGetSequenceType() !));
case MethodCallExpression methodCallExpression:
{
if (methodCallExpression.Method.IsGenericMethod &&
methodCallExpression.Method.DeclaringType == typeof(Enumerable) &&
methodCallExpression.Method.Name == nameof(Enumerable.ToList))
{
var elementType = methodCallExpression.Method.GetGenericArguments()[0];
var result = _queryableMethodTranslatingExpressionVisitor.TranslateSubquery(
methodCallExpression.Arguments[0]);
if (result != null)
{
return(_selectExpression.AddCollectionProjection(result, null, elementType));
}
}
else
{
var subquery = _queryableMethodTranslatingExpressionVisitor.TranslateSubquery(methodCallExpression);
if (subquery != null)
{
if (subquery.ResultCardinality == ResultCardinality.Enumerable)
{
return(_selectExpression.AddCollectionProjection(subquery, null, subquery.ShaperExpression.Type));
}