LINQ C# Dataset search problem

Question

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My parameters.SearchText is a List<string> containing search words. It seems this code returns a datarow that contains any string in the list. I want it to return only the datarows that contain ALL of strings in the list. Thoughts?

C#

var query1 =
         from nodes in Datasets.Datasets.dsQuestions.Tables["key"]
         from _searchtext in parameters.SearchText
             where 
             nodes.Field<string>("Question").ToUpper().Contains(_searchtext.ToUpper())                         
         select nodes;

Update: I took out the line to search Keywords since it was irrelevant.

Posted 9-Jul-12 5:40am

Member 9230112

Updated 10-Jul-12 5:36am

v5

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3 solutions

Solution 2

Use && instead of ||..
So it will become

C#

var query1 =
    from nodes in Datasets.Datasets.dsQuestions.Tables["key"]
    from _searchtext in parameters.SearchText
    where
        nodes.Field<<string>("Question").ToUpper().Contains(_searchtext.ToUpper())
        &&
        nodes.Field<string>("Keyword").ToUpper().Contains(_searchtext.ToUpper())
    select nodes;

Posted 9-Jul-12 19:30pm

Santhosh Kumar Jayaraman

Updated 10-Jul-12 5:26am

v3

Comments

Member 9230112 10-Jul-12 11:13am

That doesn't fix the problem. What is needed is to return all datarows that contain all the strings in SearchText found in either the Question or Keyword field. This code will return a datarow that contains at least one string in the SearchText.

Solution 1

C#

var query1 = Datasets.Datasets.dsQuestions.Tables["key"].Select(k=> parameters.SearchText.All(x => k.Field<string>("Question").ToUpper().Contains(x.ToUpper())
		 || k.Field<string>("Keyword").ToUpper().Contains(x.ToUpper())));

Posted 9-Jul-12 7:12am

DamithSL

Updated 9-Jul-12 7:20am

v2

Comments

Member 9230112 10-Jul-12 11:23am

This gives me the following error:

Cannot convert lambda expression to type 'string' because it is not a delegate type

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Member 9230112 · Accepted Answer · 2012-07-10T06:44:00

Solution 3

var query1 = Datasets.Datasets.dsQuestions.Tables["key"].Rows.OfType<datarow>().Where(k => parameters.SearchText.All(x => k.Field<string>("Question").ToUpper().Contains(x.ToUpper())));

Thanks to Damith for pointing me in the right direction.

Posted 10-Jul-12 6:44am

Member 9230112