将DataGridView转换为DataTable

如已绑定过数据源：DataTable dt = (dataGridView1.DataSource  DataTable)

public DataTable GetDgvToTable(DataGridView dgv)
{
    DataTable dt = new DataTable();

    // 列强制转换
    for (int count = 0; count < dgv.Columns.Count; count++)
    {
        DataColumn dc = new DataColumn(dgv.Columns[count].Name.ToString());
        dt.Columns.Add(dc);
    }

    // 循环行
    for (int count = 0; count < dgv.Rows.Count; count++)
    {
        DataRow dr = dt.NewRow();
        for (int countsub = 0; countsub < dgv.Columns.Count; countsub++)
        {
            dr[countsub] = Convert.ToString(dgv.Rows[count].Cells[countsub].Value);
        }
        dt.Rows.Add(dr);
    }
    return dt;
}