如何制作C＃DataTable过滤器

Question

我的数据表;

    dtData

    ID | ID2
    --------
    1  |  2
    1  |  3


dtData.Select("ID = 1"); one more rows;

我想要行“ID = 1和ID2 = 3”如何制作？

Answer 1

你的意思是这样吗？：

dtData.Select("ID=1 AND ID2=3");

Answer 2

好的，这就是我做这些事情的方式......

    GridFieldDAO dao = new GridFieldDAO();
    //Load My DataTable
    DataTable dt = dao.getDT();
    //Get My rows based off selection criteria
    DataRow[] drs = dt.Select("(detailID = 1) AND (detailTypeID = 2)");
    //make a new "results" datatable via clone to keep structure
    DataTable dt2 = dt.Clone();
    //Import the Rows
    foreach (DataRow d in drs)
    {
        dt2.ImportRow(d);
    }
    //Bind to my new DataTable and it will only show rows based off selection 
    //criteria
    myGrid.DataSource = dt2;
    myGrid.DataBind();

请注意我的Select（）我将Parens中的标准放在 AND 和 OR

之间

希望这有帮助！ Mike V

Answer 3

更好地利用这个：

GridFieldDAO dao = new GridFieldDAO();
//Load My DataTable
DataTable dt = dao.getDT();
//Get My rows based off selection criteria and copy them directly to datatable
DataTable dt2 = dt.Select("(detailID = 1) AND (detailTypeID = 2)").CopyToDataTable();

Answer 4

DataTable dt2 = dt.Select("ID = 1").CopyToDataTable;

确保dt中有行

Answer 5

DataTable dt2 = dt.Select("state = 'FL' ").CopyToDataTable; 

Answer 6

很好的例子，非常有帮助。想添加一件事 - 如果你需要在字符串上选择使用类似的东西：

DataTable dt2 = dt.Select("state = 'FL' ");