internal static IQueryable Deserialize(DomainServiceDescription domainServiceDescription, IQueryable query, IEnumerable<ServiceQueryPart> queryParts, QueryResolver queryResolver)
{
foreach (ServiceQueryPart part in queryParts)
{
switch (part.QueryOperator)
{
case "where":
query = DynamicQueryable.Where(query, part.Expression, queryResolver);
break;
case "orderby":
query = DynamicQueryable.OrderBy(query, part.Expression, queryResolver);
break;
case "skip":
query = DynamicQueryable.Skip(query, Convert.ToInt32(part.Expression, System.Globalization.CultureInfo.InvariantCulture));
break;
case "take":
query = DynamicQueryable.Take(query, Convert.ToInt32(part.Expression, System.Globalization.CultureInfo.InvariantCulture));
break;
}
}
// Perform any required post processing transformations to the
// expression tree
Expression expr = PostProcessor.Process(domainServiceDescription, query.Expression);
query = query.Provider.CreateQuery(expr);
return query;
}
public static IQueryable Where(this IQueryable source, string predicate, QueryResolver queryResolver)
{
if (source == null)
throw new ArgumentNullException("source");
if (predicate == null)
throw new ArgumentNullException("predicate");
LambdaExpression lambda = DynamicExpression.ParseLambda(source.ElementType, typeof(bool), predicate, queryResolver);
return source.Provider.CreateQuery(
Expression.Call(
typeof(Queryable), "Where",
new Type[] { source.ElementType },
source.Expression, Expression.Quote(lambda)));
}
public static IQueryable OrderBy(this IQueryable source, string ordering, QueryResolver queryResolver)
{
if (source == null)
throw new ArgumentNullException("source");
if (ordering == null)
throw new ArgumentNullException("ordering");
ParameterExpression[] parameters = new ParameterExpression[] {
Expression.Parameter(source.ElementType, "") };
ExpressionParser parser = new ExpressionParser(parameters, ordering, queryResolver);
IEnumerable<DynamicOrdering> orderings = parser.ParseOrdering();
Expression queryExpr = source.Expression;
string methodAsc = "OrderBy";
string methodDesc = "OrderByDescending";
foreach (DynamicOrdering o in orderings)
{
queryExpr = Expression.Call(
typeof(Queryable), o.Ascending ? methodAsc : methodDesc,
new Type[] { source.ElementType, o.Selector.Type },
queryExpr, Expression.Quote(DynamicExpression.Lambda(o.Selector, parameters)));
methodAsc = "ThenBy";
methodDesc = "ThenByDescending";
}
return source.Provider.CreateQuery(queryExpr);
}
internal static IQueryable Deserialize(DomainServiceDescription domainServiceDescription, IQueryable query, IEnumerable <ServiceQueryPart> queryParts, QueryResolver queryResolver)
{
foreach (ServiceQueryPart part in queryParts)
{
switch (part.QueryOperator)
{
case "where":
query = DynamicQueryable.Where(query, part.Expression, queryResolver);
break;
case "orderby":
query = DynamicQueryable.OrderBy(query, part.Expression, queryResolver);
break;
case "skip":
query = DynamicQueryable.Skip(query, Convert.ToInt32(part.Expression, System.Globalization.CultureInfo.InvariantCulture));
break;
case "take":
query = DynamicQueryable.Take(query, Convert.ToInt32(part.Expression, System.Globalization.CultureInfo.InvariantCulture));
break;
}
}
// Perform any required post processing transformations to the
// expression tree
Expression expr = PostProcessor.Process(domainServiceDescription, query.Expression);
query = query.Provider.CreateQuery(expr);
return(query);
}
public static LambdaExpression ParseLambda(ParameterExpression[] parameters, Type resultType, string expression, QueryResolver queryResolver)
{
ExpressionParser parser = new ExpressionParser(parameters, expression, queryResolver);
return Lambda(parser.Parse(resultType), parameters);
}
public static LambdaExpression ParseLambda(Type itType, Type resultType, string expression, QueryResolver queryResolver)
{
return ParseLambda(new ParameterExpression[] { Expression.Parameter(itType, "") }, resultType, expression, queryResolver);
}
public ExpressionParser(ParameterExpression[] parameters, string expression, QueryResolver queryResolver)
{
if (expression == null)
throw new ArgumentNullException("expression");
if (keywords == null)
keywords = CreateKeywords();
this.queryResolver = queryResolver;
symbols = new Dictionary<string, object>(StringComparer.OrdinalIgnoreCase);
literals = new Dictionary<Expression, string>();
if (parameters != null)
ProcessParameters(parameters);
text = expression;
textLen = text.Length;
SetTextPos(0);
NextToken();
}
