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 expression = DynamicExpression.ParseLambda(source.ElementType, typeof(bool), predicate, queryResolver);
return source.Provider.CreateQuery(Expression.Call(typeof(Queryable), "Where", new Type[] { source.ElementType }, new Expression[] { source.Expression, Expression.Quote(expression) }));
}
public ExpressionParser(ParameterExpression[] parameters, string expression, QueryResolver queryResolver)
{
if (expression == null)
{
throw new ArgumentNullException("expression");
}
if (keywords == null)
{
keywords = CreateKeywords();
}
this.queryResolver = queryResolver;
this.symbols = new Dictionary<string, object>(StringComparer.OrdinalIgnoreCase);
this.literals = new Dictionary<Expression, string>();
if (parameters != null)
{
this.ProcessParameters(parameters);
}
this.text = expression;
this.textLen = this.text.Length;
this.SetTextPos(0);
this.NextToken();
}
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, "") };
IEnumerable<DynamicOrdering> enumerable = new ExpressionParser(parameters, ordering, queryResolver).ParseOrdering();
Expression expression = source.Expression;
string str = "OrderBy";
string str2 = "OrderByDescending";
foreach (DynamicOrdering ordering2 in enumerable)
{
expression = Expression.Call(typeof(Queryable), ordering2.Ascending ? str : str2, new Type[] { source.ElementType, ordering2.Selector.Type }, new Expression[] { expression, Expression.Quote(DynamicExpression.Lambda(ordering2.Selector, parameters)) });
str = "ThenBy";
str2 = "ThenByDescending";
}
return source.Provider.CreateQuery(expression);
}
public static LambdaExpression ParseLambda(Type itType, Type resultType, string expression, QueryResolver queryResolver)
{
return ParseLambda(new ParameterExpression[] { Expression.Parameter(itType, "") }, resultType, expression, queryResolver);
}
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);
}
