asp.net gridview行添加 [英] asp.net gridview row adding

问题描述

DataTable dt;
    string str = ConfigurationManager.ConnectionStrings["conn"].ToString();
    protected void Page_Load(object sender, EventArgs e)
    {
        SqlConnection conn = new SqlConnection(str);
        conn.Open();
        dt = new DataTable();
        DataColumn dc = new DataColumn();
        dc = new DataColumn("Medicine");
        dt.Columns.Add(dc);
        DataRow dr = dt.NewRow();
        dr["Medicine"] = this.medicine.SelectedValue;
        dt.Rows.Add(dr);
        GridView1.DataSource = dt;
        GridView1.DataBind();
    }

<asp:DropDownList ID="medicine" runat="server" AutoPostBack="True"

            Height="22px" Width="262px">
            <asp:ListItem>agfdgd</asp:ListItem>
            <asp:ListItem>bgfdgd</asp:ListItem>
            <asp:ListItem>cgfdgd</asp:ListItem>
            <asp:ListItem>dgfdgd</asp:ListItem>
            <asp:ListItem>egfdgd</asp:ListItem>
            <asp:ListItem>fgfdgd</asp:ListItem>
            <asp:ListItem>ggfdgd</asp:ListItem>
        </asp:DropDownList>
        <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"

            Height="59px" Width="404px">
            <Columns>
                <asp:BoundField DataField="Medicine" HeaderText="name" />
            </Columns>
        </asp:GridView>

当我在dropdwn中选择另一个值时，我只能添加一行.我正在丢失先前的值，如何在不丢失先前的值的情况下添加多行

i am able to add only one row when i select another value in the dropdwn i am loosing previous value how to add multiple rows without loosing previous values

推荐答案

动态添加值，因为回发到服务器的表单中的数据表仅包含列表框的选定值.

添加后，尝试将集合保存在会话或数据库中的某些位置.

As you are dynamically adding values, as the form posted back to server your data table contains only selected value of list box.

After adding try to save the collection some where either in session or database.

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