Ejemplo n.º 1
0
        Parse(List <KeyValuePair <string, string> > queryStringParts)
        {
            if (queryStringParts.Count == 0)
            {
                return(null);
            }
            if (queryStringParts.Count == 1)
            {
                string arg = queryStringParts[0].Value;
                switch (queryStringParts[0].Key)
                {
                case "$skip":
                    return((IQDict qbl) => qbl.Skip(int.Parse(arg)));

                case "$take":
                    return((IQDict qbl) => qbl.Take(int.Parse(arg)));

                case "$filter":
                    var expParser = new ODataExpressionParser();
                    var cond      = expParser.ParseToLambda(arg);
                    return((IQDict qbl) => qbl.Where(cond));

                default:
                    return(null);
                }
            }
            var partExpressions = queryStringParts
                                  .Select(qsp => new { Key = qsp.Key, Value = Parse(new List <KeyValuePair <string, string> > {
                    qsp
                }) })
                                  .Where(pe => pe.Value != null)
                                  .ToDictionary(pe => pe.Key, pe => pe.Value);

            Expression <Func <IQDict, IQDict> > res = null;

            partExpressions
            .OrderBy(pe => pe.Key)     // happens to work the right way
            .Do(pe =>
            {
                if (res == null)
                {
                    res = pe.Value;
                }
                else
                {
                    res = Expression.Lambda <Func <IQDict, IQDict> >(Expression.Invoke(pe.Value, res.Body), res.Parameters);
                }
            });

            return(res);
        }
Ejemplo n.º 2
0
        public Expression<Func<IQDict, IQDict>> Parse(List<KeyValuePair<string, string>> queryStringParts)
        {
            if (queryStringParts.Count == 0)
                return null;
            if (queryStringParts.Count == 1)
            {
                string arg = queryStringParts[0].Value;
                switch (queryStringParts[0].Key)
                {
                    case "$skip":
                        return (IQDict qbl) => qbl.Skip(int.Parse(arg));
                    case "$take":
                        return (IQDict qbl) => qbl.Take(int.Parse(arg));
                    case "$filter":
                        var expParser = new ODataExpressionParser();
                        var cond = expParser.ParseToLambda(arg);
                        return (IQDict qbl) => qbl.Where(cond);
                    default:
                        return null;
                }
            }
            var partExpressions = queryStringParts
                .Select(qsp => new { Key = qsp.Key, Value = Parse(new List<KeyValuePair<string, string>> { qsp }) })
                .Where(pe => pe.Value != null)
                .ToDictionary(pe => pe.Key, pe => pe.Value);

            Expression<Func<IQDict, IQDict>> res = null;
            partExpressions
                .OrderBy(pe => pe.Key) // happens to work the right way
                .Do(pe =>
                    {
                        if (res == null)
                            res = pe.Value;
                        else
                        {
                            res = Expression.Lambda<Func<IQDict, IQDict>>(Expression.Invoke(pe.Value, res.Body), res.Parameters);
                        }
                    });

            return res;
        }