How to use like operator in linq query

Question

1.00/5 (2 votes)

See more:

Hi,

How to use like operator in linq. i have the below table.

i just want to filter and get the records like below condition

"where "Temp contains" ("S1,S2") ==> i want to filter all S1 and S2 in entire columns.

also i want to eleminate "where Temp not in like (%Fi%,%K%) records.

How do we write in LINQ Query.

sample table below.

Emp	Temp
100	S1+S2+S3
100	S1+S2+S3
100	S1+S2+S3
100	S1+S2+S3
100	S1+S2+S3
100	Z1+Z2+Z3
100	Z1+Z2+Z3
100	Z1+Z2+Z3
100	Z1+Z2+Z3
100	Z1+Z2+Z3
100	Z1+Z2+Z3
100	Z1+Z2+Z3
100	Z1+Z2+Z3
100	Z1+Z2+Z3
100	S1+Z3
100	L1+L2
100	L1+L2
100	A+B
100	C+DD
100	EE+Fin
100	Ke+W

What I have tried:

C#

Values = "A1,A2"
Var query1 = (from a in tbl1.AsEnumerable()

                     where r.Field<string>("TEMP").Contains(Values)

Posted 17-May-17 3:30am

gani7787

Updated 17-May-17 12:42pm

Maciej Los

v2

Add a Solution

3 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Maciej Los · Answer 1 · 2017-05-17T04:51:00

Assuming that tbl1 is a datatable object, you have to combine Where + Any method.

So, take a look at example and change your query to your needs.

C#

DataTable dt = new DataTable();
dt.Columns.Add(new DataColumn("Emp", typeof(int)));
dt.Columns.Add(new DataColumn("Temp", typeof(string)));
dt.Rows.Add(new object[]{100, "S1+S2+S3"});
dt.Rows.Add(new object[]{100, "S1+S2+S3"});
dt.Rows.Add(new object[]{100, "S1+S2+S3"});
dt.Rows.Add(new object[]{100, "S1+S2+S3"});
dt.Rows.Add(new object[]{100, "S1+S2+S3"});
dt.Rows.Add(new object[]{100, "Z1+Z2+Z3"});
dt.Rows.Add(new object[]{100, "Z1+Z2+Z3"});
dt.Rows.Add(new object[]{100, "Z1+Z2+Z3"});
dt.Rows.Add(new object[]{100, "Z1+Z2+Z3"});
dt.Rows.Add(new object[]{100, "Z1+Z2+Z3"});
dt.Rows.Add(new object[]{100, "Z1+Z2+Z3"});
dt.Rows.Add(new object[]{100, "Z1+Z2+Z3"});
dt.Rows.Add(new object[]{100, "Z1+Z2+Z3"});
dt.Rows.Add(new object[]{100, "Z1+Z2+Z3"});
dt.Rows.Add(new object[]{100, "S1+Z3"});
dt.Rows.Add(new object[]{100, "L1+L2"});
dt.Rows.Add(new object[]{100, "L1+L2"});
dt.Rows.Add(new object[]{100, "A+B"});
dt.Rows.Add(new object[]{100, "C+DD"});
dt.Rows.Add(new object[]{100, "EE+Fin"});
dt.Rows.Add(new object[]{100, "Ke+W"});

string[] values = new string[]{"S1", "S2"};
var qry = dt.AsEnumerable()
	.Where(x=> x.Field<string>("Temp")
			.Split(new string[]{"+"}, StringSplitOptions.RemoveEmptyEntries)
			.Any(y=>values.Contains(y)));

Result:

Emp Temp
100 S1+S2+S3 
100 S1+S2+S3 
100 S1+S2+S3 
100 S1+S2+S3 
100 S1+S2+S3 
100 S1+Z3

Robert Raboud · Answer 2 · 2017-05-17T10:13:00

Solution 2

string[] values = new string[] { "S1", "S2" };
string[] notval = new string[] { "Fi", "K" } ;
var qry = tbl1.AsEnumerable()
                .Where(x => (x.Field<string>("Temp").Contains(values[0]) || 
                            x.Field<string ("Temp").Contains(values[1]) &&
                           (!x.Field<string>("Temp").Contains(notval[0]) || 
                            !x.Field<string ("Temp").Contains(notval[1])));
int count = qry.Count;

Posted 17-May-17 10:13am

Robert Raboud

Updated 18-May-17 2:19am

v3

Comments

gani7787 18-May-17 2:13am

Thanks for your result.
My query like below in LINQ without lambda expression.

Tempvalues1 = "S1","S2"; ==> For contain value
Tempvalues2 = "Fi","k"; ==> for doesn't contain value
qry = (from r in tbl1.AsEnumerable()
where r.Field<int>("EmpNo") == Emp && r.Field<string>("Temp").Contains(TempValues1)
&& !(r.Field<string>("Temp").Contains((TempValues2)))
select new
{
}).Count();

how to get the count of the filter recrods..?

Robert Raboud 18-May-17 8:21am

added the negative search to solution and a variable for count.

George Swan · Answer 3 · 2017-05-17T12:42:00

Solution 3

You can use Aggregate to cater for multipile target values. Something like.

C#

var query = dt.AsEnumerable();
           var strs = new[] { "S1", "S2" };
           query = strs.Aggregate(query, (current, s) => current.Where(x => x.Field<string>("Temp").Contains(s)));

Posted 17-May-17 12:42pm

George Swan