如何制作C＃DataTable过滤器

Question

my datatable;

    dtData

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


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

i want row "ID = 1 And ID2 = 3" how to make ?

Answer 1

你是这个意思吗？

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

Answer 2

Okay, here is how I do such things...

    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();

Notice in my Select() I put the criteria in Parens between AND and OR

Hope this helps! Mike V

Answer 3

Better use this :

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

在这里，您可以使用Linq的CopyToDataTable方法将内容复制到另一个DataTable，同时通过过滤选择特定的行。

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

Answer 6

Great example and very helpful. Wanted to add one thing - if you need to select on a string use something like:

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