How to filter column from dataset using lambda expression?

Question

0.00/5 (No votes)

See more:

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

Add a Solution

3 solutions

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.

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

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)

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>