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How do I get the index of a column by the column name?

I have a datagrid with multiple columns -

The grid title is a hyperlink and I set its value at runtime like this:

string strQ1 = "<a href='somePage.aspx?ID=1'>gfgytyty<a>";
dtGrid.Columns[0].Header = strq1;

string strQ2 = "<a href='somePage.aspx?ID=2'>yhtryrtuyu<a>";
dtGrid.Columns[1].Header = strq2;

and so on...

It works correctly. Now, suppose I want to get the index of the datatgrid columnar column by its name, but I cannot get it. I tried

int  colIndex = dtGrid.Columns.IndexOf(dtGrid.Columns[strQ2]);

this should return 1 as columnIndex, but it returns -1,

Also dtGrid.Columns [strQ2] gives me a null value.

what am i doing wrong here?

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2 answers


Try using LINQ FirstOrDefault to get the object first and then use .IndexOf (object):



dtGrid.Columns.IndexOf(dtGrid.Columns.FirstOrDefault(c => c.Header == strQ2));
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Here's a different approach using List.FindIndex

:

int index = dtGrid.Columns.ToList().FindIndex(c => c.Header  == strQ2);


If it is not WPF DataGrid

(which appears to be property bound Header

) but winforms DataGridView

which does not implement a generic collection type, then you need to discard it before you can use LINQ methods:

var columnList = dtGrid.Columns.Cast<DataGridViewColumn>().ToList();
int index = columnList.FindIndex(c => c.HeaderText  == strQ2);
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