How to search multiple parameters using linq

Question

4.00/5 (1 vote)

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Dear all,

When I try to query(/api/data?name=storm,prestl,bcam&tag=78473TAC4,12669VAC2,05946XYZ0).
I am getting (no data) response. I have tested the query with its values against my sql and its able to output 10 records.

C#

var data = db.database_Bd.AsQueryable();
        if (query.startDate != null)
        {
            data = data.Where(c => c.UploadDate >= query.startDate);
        }

        if (!string.IsNullOrEmpty(query.name))
        {
            var list = query.name.split(',');
            data = data.Where(pr => list.Any(pr2 => pr.Name.Contains(pr2)));
        }

        if (!string.IsNullOrEmpty(query.tag))
        {
            var list = query.tag.split(',');
            data = data.Where(pr => list.Any(pr2 => pr.TAG.Contains(pr2)));
        }

The following updated code:

C#

var filteredData = new List<IQueryable<database_bd>>();

            if (!string.IsNullOrEmpty(query.tag))
            {
                var ids = query.tag.Split(',');
                foreach (string i in ids)
                {
                    var list = data.Where(c => c.TAG != null && c.TAG.Contains(i)).AsQueryable();

                    filteredData.Add(list);
                }
            }

            if (filteredData.Count != 0)
            {
              data = filteredData.Aggregate(Queryable.Union);
            }

I am experiencing an error (ExceptionMessage":"Some part of your SQL statement is nested too deeply. Rewrite the query or break it up into smaller queries.) when I run a query such as:

api/test?tag = 78473,12669,05946,
45660,02150,12667,4566,3622,38379,
61755,45660,3384,288,23242,81378,
68402,59025,59024,59024,59023,12669,
76111,86359,05946,05946
01448,07387,14889,22545,3136,38137, 49638

Please help. Any advice, would be much appreciated, if possible.

Posted 24-Apr-14 23:17pm

miss786

Updated 28-Apr-14 23:26pm

v2

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Comments

Sampath Lokuge 25-Apr-14 6:05am

Can you put the sql query which you ran on your db ?

miss786 25-Apr-14 6:20am

select *
from [dbo].[database_BD]
where TAG like '%78473TAC4%'
or TAG LIKE '%05946XYZ0%'
OR NAME LIKE '%TAP%'
OR NAME LIKE '%STORM%'

Many thanks for your response and feedback.

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Sampath Lokuge · Accepted Answer · 2014-04-25T04:00:00

C#

var yourList = declare-your-list

 if (!string.IsNullOrEmpty(query.name))
            {

                var lists = query.name.split(',');

                foreach(var l in lists)
                {

                if (data.Where(pr => pr.Name.Contains(l)) !=null)
                      {
                       yourList.AddRange(data.Where(pr => pr.Name.Contains(l)));
                      }

                }

           }

Above I have showed how to do it for the one part of your code snippet.So try the same for other parts and add it into yourList List and get finally filtered list.I hope this will help to you.If you have further issues,Please ask. :)