how to find a first row and return from linq

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Hi All,
I want to find a single row from datatable.
I have more then 1 row with same id in data table. I want to find single data-row. If row find with the id then select the row and break. How can i achieve it using LINQ?

Posted 2-Jan-14 18:52pm

amit_83

Updated 27-Sep-18 1:28am

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2 solutions

Solution 2

rest

Posted 27-Sep-18 1:29am

Member 12611698

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Karthik_Mahalingam · Accepted Answer · 2014-01-02T19:05:00

Solution 1

C#

int id = 2;
       var item = lstData.FirstOrDefault(k => k.ID == id);
      if (item != null)
      {
// use the Item object to read the properties.
          // your code here...
      }

It always better to use FirstOrDefault instead of single, if you going to search primary key value then we can use singleordefault
if we are in doubt that duplicate records may contains, then we can go for FirstOrDefault.

C#

DataRow drr = dt.AsEnumerable().Where(dr => dr["P"] == id).First();
       var index = dt.Rows.IndexOf(drr);

Posted 2-Jan-14 19:05pm

Karthik_Mahalingam

Updated 2-Jan-14 19:48pm

v2

Comments

amit_83 3-Jan-14 1:17am

Thanks, I want to get the display index of row in datatable.

Karthik_Mahalingam 3-Jan-14 1:27am

can u provide more info?

amit_83 3-Jan-14 1:32am

DataRow drr = dt.AsEnumerable().Where(dr => dr.Field<guid>("P") == id)
.Select(dr => dr).First();

Instead of getting the row i want to know the index of row. Is it possible to get the row index in the table directly from LINQ?

Karthik_Mahalingam 3-Jan-14 1:48am

check my updated solution..

amit_83 3-Jan-14 1:57am

I know this already, its 2 step process, Does it impact the performance?

Karthik_Mahalingam 3-Jan-14 1:58am

then u shld go to datatable filter instead of linq...

Karthik_Mahalingam 3-Jan-14 2:04am

try like this
DataRow[] rows = dt.Select("p = 2");

SarveshShukla 3-Jan-14 2:08am

This will give you the id
var x = dt.AsEnumerable().Where(dr => dr.Field("P") == id)
.Select(dr => dr.id).First();