C# 获取DataGridView控件选中行的集合

//先判断是否有勾选行，有勾选则只导出勾选的行。
                //定义和DataGridView控件内容结构相同的DataTable
                //dtCartClo是DataGridView的数据源
                DataTable dtDgv = this.dtCartClo.Clone();//
                foreach (DataGridViewRow dgRow in this.dgvxCtnPOC.Rows)
                {
                    if (dgRow.Cells["选择"].Value != null && dgRow.Cells["选择"].Value.ToString().ToLower() == "true")
                    {
                        DataRow newRow = this.dtCartClo.NewRow();
                        foreach (DataColumn col in this.dtCartClo.Columns)
                        {
                            if (col.ColumnName == "ClothingID")
                            {
                                newRow[col.ColumnName] = Convert.ToInt32(dgRow.Cells[col.ColumnName].Value);
                            }
                            else
                            {
                                newRow[col.ColumnName] = dgRow.Cells[col.ColumnName].Value.ToString();
                            }
                        }
                        dtDgv.Rows.Add(newRow.ItemArray);
                    }
                }