Question

我有一个从sqldatasource填充的6个下拉列表。我还有另一个sqldatasource返回一些行。我想要做的是遍历第二个数据源的每一行，并在我的下拉列表中选择该值。因此，如果第二个数据源包含三行，它将在前三个下拉列表中选择适当的值，并将其他数据集设置为“N / A”。

这是我想到的一些伪代码

protected void fileattributes_ItemDataBound(object sender, ListViewItemEventArgs e)
{
        DropDownList kw1 = (DropDownList)e.Item.FindControl("keyw1");
        DropDownList kw2 = (DropDownList)e.Item.FindControl("keyw2");
        DropDownList kw3 = (DropDownList)e.Item.FindControl("keyw3");
        DropDownList kw4 = (DropDownList)e.Item.FindControl("keyw4");
        DropDownList kw5 = (DropDownList)e.Item.FindControl("keyw5");
        DropDownList kw6 = (DropDownList)e.Item.FindControl("keyw6");

        DropDownList[] array = { kw1, kw2, kw3, kw4, kw5, kw6 };

        for(int i = 0; i<sqldatasource2.length;i++)
        {            
              array[i].SelectedItem.Text = sqldatasource2.item    
        }

        foreach(Array a in array)
        {    
              if (a is null)
              {    
                   a.selecteditem.text = "N/A";
              }        
        }        
}

Answer 1

我没有直接使用sqldatasource的经验，所以我做的是用结果集填充DataTable。希望这个有效！

    DropDownList kw1 = (DropDownList)e.Item.FindControl("keyw1");
    DropDownList kw2 = (DropDownList)e.Item.FindControl("keyw2");
    DropDownList kw3 = (DropDownList)e.Item.FindControl("keyw3");
    DropDownList kw4 = (DropDownList)e.Item.FindControl("keyw4");
    DropDownList kw5 = (DropDownList)e.Item.FindControl("keyw5");
    DropDownList kw6 = (DropDownList)e.Item.FindControl("keyw6");

    DropDownList[] array = { kw1, kw2, kw3, kw4, kw5, kw6 };

    DataView dv = new DataView();
    DataTable dt = new DataTable();    
    dv = (DataView)SqlDataSource1.Select(DataSourceSelectArguments.Empty);
    dt = dv.ToTable();

    int i = 0;
    foreach (DataRow dr in dt.Rows)
    {
        // dr["column name or column index"] (zero in my case)
        array[i].SelectedItem.Text = dr[0].ToString();
        i++;
    }

Answer 2

DataSourceSelectArguments args = new DataSourceSelectArguments();
DataView view = (DataView)SqlDataSource1.Select(args);
DataTable dt = view.ToTable();

DropDownList[] array = { kw1, kw2, kw3, kw4, kw5, kw6 };
int i;
for (i = 0; i < dt.Rows.Count;i++ )
{
    array[i].SelectedItem.Text = dt.Rows[i][0].ToString();
}

// If array length (number of DropDowns) is greater than rows in datasource
// Remaining Dropdowns will get text N/A --- Now i=dt.Rows.Count
for (; i < array.Length; i++)
{
    array[i].SelectedItem.Text = "N/A";
}

从sqldatamart asp.net中选择下拉列表项

2 个答案: