how to use like % in linq query ?

Question

4.50/5 (2 votes)

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hi friends,

i am using mysql as back end and wpf asa front end in my program. in that i want to do

select * from mcs_Hall where mcs_Hall_Name = "%j%";

query. so i try this coding

string str = txt_Search.Text.Trim();
dataGrid1.DataContext = from re in MainWindow.mcsEntity.mcs_hall
                        where SqlMethods.Like(re.mcs_Hall_Name, "%j%")          
select new
{
  name = re.mcs_Hall_Name,
  code = re.mcs_Hall_Code
};

but it throw this exception,...

LINQ to Entities does not recognize the method 'Boolean Like(System.String, System.String)' method, and this method cannot be translated into a store expression.

help me to do this.

Posted 1-Mar-11 0:19am

Sagotharan Jagadeeswaran

Updated 26-Jan-17 3:16am

Manas Bhardwaj

v3

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2 solutions

Solution 2

http://stackoverflow.com/questions/2584598/linq-sqlmethods-like-fails

this article help me,.

LIKE 'a%' => StartsWith("a")
LIKE '%a' => EndsWith("a")
LIKE '%a%' => Contains("a")
LIKE 'a%b' => StartsWith("a") && EndsWith("b")
LIKE '%a%b%' => StartsWith("a") && Contains("b")

now my code is

dataGrid1.DataContext = from re in MainWindow.mcsEntity.mcs_hall re.mcs_Hall_Name.Contains(txt_Search.Text.Trim())

thank u very much,.

Posted 1-Mar-11 0:50am

Sagotharan Jagadeeswaran

Comments

Avinash Ramchandra Shinde 22-May-13 1:12am

thank you, very good solution

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Manas Bhardwaj · Accepted Answer · 2011-03-01T00:35:00

Solution 1

Usually, when I am totally clueless (which is the case most of times ;)), I copy the error message and look if there are other people having a similar problem.
This [^]is what I did in your case.

And the very first article[^] seems to be promising.

Posted 1-Mar-11 0:35am

Manas Bhardwaj

Updated 1-Mar-11 0:46am

v2

Comments

Pravin Patil, Mumbai 1-Mar-11 6:43am

Very good link manas...

Manas Bhardwaj 1-Mar-11 6:46am

thanks!

Sagotharan Jagadeeswaran 1-Mar-11 6:50am

thank u friend,.

Member 11233366 9-Mar-15 7:56am

Dear i have to search *a*b*c* in a table column so please suggest a good solution i already wasted so much time on it.
Regards Wasif
Int32 case_id =( from c in db.CaseTLS
where SqlMethods.Like(c.TypeDescription, key3)
&& c.CaseNumber ==key1
&& c.Year == key2
select c.CaseId).FirstOrDefault();
where key3 contains that pattern but i am getting an exception on like method