DataTable改变column类型

1、必须先克隆DataTable

2、列换类型

3、逐行往新DataTable赋值，并转换某列类型

如：

DataTable dt = diorg.Clone(); //必须先克隆，此时并不包含数据

            dt.Columns[col].DataType = typeof(bool);

            foreach (DataRow row in diorg.Rows)

            {

                DataRow rowNew = dt.NewRow();

                for (int i = 0; i < dt.Columns.Count; i++)

                {

                    if (i == col)

                    {

                        try

                        {

                            rowNew[i] = Convert.ToBoolean(row[i]);

                        }

                        catch { }

                    }

                    else

                        rowNew[i] = row[i];

                }

                dt.Rows.Add(rowNew);

            }

            return dt;