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How to check datatable select method returns datatable c#


How to check datatable select method returns datatable c#

By : user2956375
Date : November 22 2020, 10:54 AM
Does that help You can do this using ternary operator to check if count is greater than 0 then call CopyToDataTable() else return empty DataTable or null:
code :
DataTable _dtt = dt.Select("fcm_id=1").Count() > 0 ? dt.Select("fcm_id=1").CopyToDataTable() :new DataTable();
var result = dt.Select("fcm_id=1");

DataTable _dtt =null;

if (result.Count() > 0)
    _dtt = result.CopyToDataTable();


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Linq on DataTable: select specific column into datatable, not whole table

Linq on DataTable: select specific column into datatable, not whole table


By : Dan Sweeney
Date : March 29 2020, 07:55 AM
will be helpful for those in need If you already know beforehand how many columns your new DataTable would have, you can do something like this:
code :
DataTable matrix = ... // get matrix values from db

DataTable newDataTable = new DataTable();
newDataTable.Columns.Add("c_to", typeof(string));
newDataTable.Columns.Add("p_to", typeof(string));

var query = from r in matrix.AsEnumerable()
            where r.Field<string>("c_to") == "foo" &&
                    r.Field<string>("p_to") == "bar"
            let objectArray = new object[]
            {
                r.Field<string>("c_to"), r.Field<string>("p_to")
            }
            select objectArray;

foreach (var array in query)
{
    newDataTable.Rows.Add(array);
}
Adding rows to DataTable from DataTable.Select() - column count not match?

Adding rows to DataTable from DataTable.Select() - column count not match?


By : Abdul Hamid
Date : March 29 2020, 07:55 AM
With these it helps dtCategories.Select("id = 123") returns an array of DataRow satisfying your select criteria, say for example 5 rows.
The overload of dtLevel1.Rows.Add which gets object[] actually gets an array of columns values in other words it expects a row. Your code messing up a Row with an array of rows.
Cleaner way to check for a datatable in a dataset and then remove/add datatable

Cleaner way to check for a datatable in a dataset and then remove/add datatable


By : Sevenatoms
Date : March 29 2020, 07:55 AM
This might help you Depending on how you feel about extension methods, you could add an extension method to DataSet.
code :
Imports System.Runtime.CompilerServices

Module ExtensionMethods

    <Extension> Public Sub Replace(ByVal dataSet As DataSet, ByVal dataTable As DataTable)
        If dataSet.Tables.Contains(dataTable.TableName) Then
            dataSet.Tables.Remove(dataTable.TableName)
        End If
        dataSet.Tables.Add(dataTable)
    End Sub

End Module
XMLDataSet.Replace(CabinetTable)
XMLDataSet.Replace(DocTypeTable)
XMLDataSet.Replace(IndexTable)
'...
Enable Multi Select & Event Select Datatable At The Same Initialising Datatable

Enable Multi Select & Event Select Datatable At The Same Initialising Datatable


By : PU Chen
Date : March 29 2020, 07:55 AM
will help you can someone tell me how to enable multi select and enable event select at the same initialising datatables , It should working by using this only.
code :
  select: {
     'style': 'multi'
  }
How to select values from datatable based on another datatable using DataRow list

How to select values from datatable based on another datatable using DataRow list


By : Grantski
Date : March 29 2020, 07:55 AM
I hope this helps . Yes, you missed to convert List to comma seperated elements string.
Try below code
code :
//Below code will convert List<int> SitNumList = new List<int>(){1, 2, 3, 4} to string "1, 2, 3, 4"
string siteNums = string.Join(", ", SitNumList);
DataTable dtPross = "select SitNum from dbo.Table2 where SitNum in (" + siteNums  + ")";
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