DataTable加上编号，截取列

 

刚刚碰到对DataTable的操作，记录一下两个方法,或许对你有用

 

/// <summary>

/// 给已有DataTable的首列加上序号列

/// </summary>

/// <param name="srcTable">源数据表</param>

/// <returns>结果数据表</returns>

private DataTable GetDataTable(DataTable srcTable)

{

    DataTable dstntnTable = new DataTable();

    dstntnTable.Columns.Add("Id", typeof(Int32));

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

        dstntnTable.Columns.Add(srcTable.Columns[i].ColumnName, srcTable.Columns[i].DataType);

    int srcColCount = srcTable.Columns.Count;

    int srcRowCount = srcTable.Rows.Count;

    int dstntnRowCount = 0;

    for (int j = 0; j < srcRowCount; j++)

    {

        DataRow newRow = dstntnTable.NewRow();

        newRow[0] = (++dstntnRowCount);

        for (int k = 0; k < srcColCount; k++)

            newRow[k + 1] = srcTable.Rows[j][k];

        dstntnTable.Rows.Add(newRow);

    }

    return dstntnTable;

}

 

/// <summary>

/// 取出指定数据表中指定列数据并在首列加上编号列

/// </summary>

/// <param name="srcTable">源数据表</param>

/// <param name="para">需要取出源数据表的列名</param>

/// <returns>结果数据表</returns>

private DataTable GetDataTable(DataTable srcTable, params string[] para)

{

    DataTable dstntnTable = new DataTable();

    dstntnTable.Columns.Add("Id", typeof(Int32));

    for (int i = 0; i < para.Length; i++)

        dstntnTable.Columns.Add(para[i], srcTable.Columns[para[i]].DataType);

    int srcRowCount = srcTable.Rows.Count;

    int dstntnRowCount = 0;

    for (int j = 0; j < srcRowCount; j++)

    {

        DataRow newRow = dstntnTable.NewRow();

        newRow["Id"] = (++dstntnRowCount);

        for (int k = 0; k < para.Length; k++)

            newRow[para[k]] = srcTable.Rows[j][para[k]];

        dstntnTable.Rows.Add(newRow);

    }

    return dstntnTable;

}