How to filter column from dataset using lambda expression?

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Hi all,
This is my function i want select particular column from dataset using lambda expression and add into var temp to return that.I am not getting string format but i am getting object format as System.Collections.Generic.List`1[System.String].Why this is happening?Is my approach right?How can i convert to string?

var temp = new
{

C#

val1= dataset.Tables[1].AsEnumerable().Where(z => z.Field<int>("Id") == 1000).Select(x => x.Field<string>("Name")).ToList(),

C#

val2 = dataset.Tables[1].AsEnumerable().Where(z => z.Field<int>("Id") == 1000).Select(x => x.Field<int>("TypeId")).ToList()

};
return temp;

Thanks in Advance :-)

What I have tried:

I have tried the above code mentioned.

Posted 2-Aug-16 0:17am

Maniraj.M

Updated 2-Aug-16 1:20am

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3 solutions

Solution 2

I wrote this straight out of mind, not tested, but I hope you get the idea.

C#

var temp = from t in dataset.Tables[1].Rows() 
            where Convert.ToInt32(t["Id"]) == 1000
            select new { t["Name"].ToString(), t["TypeId"].ToString() };

Posted 2-Aug-16 1:05am

Shameel

Solution 3

var temp = new
{

val1 = dataset.Tables[1].AsEnumerable().Where(z => z.Field<int>("Id") == 1000).Select(x => x.Field<string>("Name")).FirstOrDefault(),
val2 = dataset.Tables[1].AsEnumerable().Where(z => z.Field<int>("Id") == 1000).Select(x => x.Field<int>("TypeId")).FirstOrDefault()
};

Posted 2-Aug-16 1:20am

Maniraj.M

Comments

VICK 3-Aug-16 1:18am

Copy paste from the Karthik's Solution.

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Karthik_Mahalingam · Accepted Answer · 2016-08-02T01:00:00

use Enumerable.First(TSource) [^]

C#

 var temp = new
{

    val1 = dataset.Tables[1].AsEnumerable().Where(z => z.Field<int>("Id") == 1000).Select(x => x.Field<string>("Name")).First(),
    val2 = dataset.Tables[1].AsEnumerable().Where(z => z.Field<int>("Id") == 1000).Select(x => x.Field<int>("TypeId")).First()
};</int></int></string></int>

now val1 will be of type string and val2 as int

better way

C#

DataRow row = dataset.Tables[1].AsEnumerable().FirstOrDefault(z => z.Field<int>("Id") == 1000);
       if (row != null)
       {
           var temp = new   {  val1 = row.Field<string>("Name"), val2 = row.Field<string>("Name"),   };
       }</string></string></int>