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DataTable column reorder

Tags:

c#

ado.net

I'm using a DataTable with the contents

       column1    column2   column3  column4 column5 column6 column7 column8 column9 column10
row1   a           b         c         d       e       f       g      h       i        j

I want the table to be reorderd as

        column4    column2    column1  column7 column6 column9 column10 column5 column8 column3
row1     d         b           a         g      f       i       j        e       h       c    

I tried using the DataTable.Column[i].SetOrdinal() method but it swaps only the first column properly.

like image 202
Dwellerincellar Avatar asked Oct 17 '12 15:10

Dwellerincellar


Video Answer


2 Answers

Since you haven't shown the full code it's difficult to say what's actually wrong. But this should work:

public static void ReorderTable(ref DataTable table, params String[] columns)
{
    if (columns.Length != table.Columns.Count)
        throw new ArgumentException("Count of columns must be equal to table.Column.Count", "columns");

    for (int i = 0; i < columns.Length; i++)
    {
        table.Columns[columns[i]].SetOrdinal(i);
    }
}

Instead of a params String[] you could also use a List<DataColumn> or whatelse you prefer.

Tested with your sample data:

var table = new DataTable();
table.Columns.Add("column1", typeof(string));
table.Columns.Add("column2", typeof(string));
table.Columns.Add("column3", typeof(string));
table.Columns.Add("column4", typeof(string));
table.Columns.Add("column5", typeof(string));
table.Columns.Add("column6", typeof(string));
table.Columns.Add("column7", typeof(string));
table.Columns.Add("column8", typeof(string));
table.Columns.Add("column9", typeof(string));
table.Columns.Add("column10", typeof(string));

for (int i = 0; i < 10; i++)
{
    table.Rows.Add("colum1", "column2", "colum3", "column4", "column5", "column6", "column7", "column8", "column9", "column10");
}

ReorderTable(ref table, "column4", "column2", "column1", "column7", "column6", "column9", "column10", "column5", "column8", "column3");

Works already with .NET 2.

like image 152
Tim Schmelter Avatar answered Nov 04 '22 09:11

Tim Schmelter


int cnt = 0;
foreach (string s in colsList)
{
    if (table.Columns.Contains(s))
    {
        table.Columns[s].SetOrdinal(cnt);
        cnt++;
    }
}

count need not to be the same.

like image 43
Rama Krishna Avatar answered Nov 04 '22 08:11

Rama Krishna