LINQ - how to find particular column if my column name as LIST parameter column

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Hi ,

I am passing list value into the datatable.

I want to find the column first and then check whether the value exist or not for that columns.

I want to write in LINQ Query as bool true/false

for example,

C#

string str ABSCHECK = ABS A#ABS B // input value

string[] words1 = str.Split('#'); //Splitting the values

words1[0] ABS A //list

[1] ABS B

The above two value is a column name and i want to check in the below table.

DTTABLE :

A ABS A(MN) ABS A(MX) ABS B(MN) ABS B(MX) ABS C(MN) ABS C(MX)
100 100 100 100 100 100 100
For ABS A ==> Matching two columns and values present(like ABS A(MN) and ABS A(MX))

For ABS B ==> Matching two columns and values exists (like ABS B(MN) and ABS B(MX))

So i want to return result is true.

if nothing is matching, it means (column not identified and value not present) returns false.

How to write LINQ..?

below is my query

C#

string str ABSCHECK = ABS A#ABS B // input value

string[] words1 = str.Split('#'); //Splitting the values

bool results = (from r in DTTABLE.AsEnumerable()
                           select r.Field<string>(words1.ToList())); // to find out columns and value

but not working..?

What I have tried:

string str ABSCHECK = ABS A#ABS B // input value

string[] words1 = str.Split('#'); //Splitting the values

bool results = (from r in DTTABLE.AsEnumerable()
                           select r.Field<string>(words1.ToList())); // to find out columns and value

but not working..?

Posted 19-Jul-17 0:06am

gani7787

Updated 9-Aug-17 20:20pm

Andy Lanng

v2

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Maciej Los · Answer 1 · 2017-08-09T20:20:00

Not sure i understand you well, but... If you want to get single-column result, you have to loop through the names of columns you'd split from string. Take a look at example:

C#

DataTable dt = new DataTable();

dt.Columns.Add(new DataColumn("ABS A", typeof(string)));
dt.Columns.Add(new DataColumn("ABS B", typeof(string)));

dt.Rows.Add(new object[]{"A", "1"});
dt.Rows.Add(new object[]{"B", "2"});
dt.Rows.Add(new object[]{"C", "3"});
dt.Rows.Add(new object[]{"D", "4"});
dt.Rows.Add(new object[]{"E", "5"});

string str = "ABS A#ABS B"; // input value
 
List<string> cols = str.Split(new string[]{"#"}, StringSplitOptions.RemoveEmptyEntries).ToList(); //Splitting the values

foreach(string c in cols)
{
	var result = dt.AsEnumerable()
              .Select(r=> r.Field<string>(c))
			  .ToList();
	//result.Dump(); //LinqPad option to display values stored in a result variable
}