将行值添加到具有AutoIncreamented DataColumn的DataTable中

Question

I want to add a row in a DataTable having a Data Column which has an auto Increament Property.

DataTable tblproduct = new DataTable();

DataColumn CartItemId = new DataColumn();
CartItemId.ColumnName = "CartItemId";
CartItemId.DataType = System.Type.GetType("System.Int32");
CartItemId.AutoIncrement = true;
CartItemId.AutoIncrementSeed = 1;
CartItemId.AutoIncrementStep = 1;
CartItemId.ReadOnly = true;
CartItemId.Unique = true;

tblproduct.Columns.Add(CartItemId);
tblproduct.Columns.Add("CampaignId", typeof(int));
tblproduct.Columns.Add("SubCatId", typeof(int));
tblproduct.Columns.Add("Size", typeof(string));
tblproduct.Columns.Add("Qty", typeof(int));

tblproduct.Rows.Add(3, 345,"Hello", 1);
tblproduct.Rows.Add(5, 3455,"Hecfghhgdfllo", 8);

I don't want to insert the values in Autoincreamented column. It should be Autogenerated value but above code didn't work for me.

Answer 1

When adding the row, rather try something like

        DataRow dr = tblproduct.NewRow();
        dr["CampaignId"] = 3;
        dr["SubCatId"] = 345;
        dr["Size"] = "Hello";
        dr["Qty"] = 1;
        tblproduct.Rows.Add(dr);

also from DataColumn.AutoIncrement Property

You can create a new row using the ItemArray property of the DataRow class and passing in an array of values. This is a potential problem for a column with its AutoIncrement set to true, because its value is generated automatically. To use the ItemArray property, place null in the column's position in the array.

change your code to something like

        tblproduct.Rows.Add(null,3, 345, "Hello", 1);
        tblproduct.Rows.Add(null,5, 3455, "Hecfghhgdfllo", 8);