how to write Linq query or lambda expresion from sql query

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Hi All,
i want to write linq query or lambda expresion fot this sql query

SQL

select Max(tblEmailList.name),count(tblEmailRecipientList.ListId) from tblEmailList  join tblEmailRecipientList on tblEmailRecipientList.ListId = tblEmailList.ListId
group by tblEmailRecipientList.ListId

thanks in advance

Posted 12-Oct-15 22:32pm

Member 10419297

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Comments

Sinisa Hajnal 13-Oct-15 4:52am

What have you tried? Also, what is wrong with using SQL query?

Anil Sharma1983 13-Oct-15 5:50am

in this way we achieve result in linq lamda expression. for this example i have made
the dummy list (tblEmailList and tblEmailRecipientList)

var result = _tblEmailList.AsEnumerable()
.Join(_tblEmailRecipientList.AsEnumerable(), o => o.ListId, od => od.ListId,
(o, od) => new { _tblEmailList = o, rList = od })
.GroupBy(p => p.rList.ListId).Select(g => new
{
count = g.Count(),
MaxName = g.Max(p => p._tblEmailList.name)

});

2 solutions

Solution 1

Start here: How to: Perform Grouped Joins (C# Programming Guide)[^]
Please, come back here when you get stuck.

For further details, please see:
Query Expression Syntax Examples: Join Operators[^]
Query Expression Syntax Examples: Grouping[^]
How to: Write LINQ Queries in C#[^]
101 LINQ Samples[^]
LINQ Query Expressions (C# Programming Guide)[^]

Posted 12-Oct-15 23:50pm

Maciej Los

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Manas_Kumar · Accepted Answer · 2015-10-13T00:01:00

Solution 2

Try like below:

C#

var result = from p in context.tblEmailRecipientList             
 join c in context.tblEmailList on p.ListId equals c.ListId  
 group p by p.ListId into temp 
 select new 
 {
       TotalCount = temp.Count(), 
       MaxName = temp.Max(m => m.name)
 };

Posted 13-Oct-15 0:01am

Manas_Kumar

Comments

Maciej Los 13-Oct-15 11:01am

Looks good, +5!