如何在一行中查找控件并将其绑定到数据

时间:2012-03-31 22:57:10

标签: c# asp.net data-binding

我有一个gridview,在gridview中我得到了一个项目模板如下

        <ItemTemplate> 
        <asp:DropDownList runat="server" ID="ddlProductNames"> 
        </asp:DropDownList> 
    </ItemTemplate> 

现在在gridview的每一行我需要将它绑定到数据,但是我无法找到它并将其绑定到数据。

gridview有4个模板字段,每个模板字段中有1个itemtemplate,如下所示

   <asp:TemplateField HeaderText="Product Name"  ItemStyle-HorizontalAlign = "Center" > 
            <ItemTemplate> 
                <asp:TextBox runat="server" ID="txt1" /> 
            </ItemTemplate> 
            <ItemStyle HorizontalAlign="Center" />   
        </asp:TemplateField> 
        <asp:TemplateField HeaderText="Products" ItemStyle-HorizontalAlign = "Center" > 
            <ItemTemplate> 
                <asp:DropDownList runat="server" ID="ddlProductNames"> 
                </asp:DropDownList> 
            </ItemTemplate> 
            <ItemStyle HorizontalAlign="Center"  />   
        </asp:TemplateField> 
        <asp:TemplateField HeaderText="Image" ItemStyle-HorizontalAlign = "Center" > 
            <ItemTemplate> 
                <asp:FileUpload runat="server" ID="image" /> 
            </ItemTemplate> 
            <ItemStyle  HorizontalAlign="Center"  />   
        </asp:TemplateField> 
        <asp:TemplateField HeaderText="Active" ItemStyle-HorizontalAlign = "Center"> 
            <ItemTemplate> 
                <asp:CheckBox Text="Active" runat="server" ID="active" /> 
            </ItemTemplate> 
            <ItemStyle  HorizontalAlign="Center" /> 
        </asp:TemplateField>   

我正试图将下拉列表绑定如下

    protected void Grid_OnRowDataBound(Object sender, GridViewRowEventArgs e)
    {
        // Bind Products
        Product productManager = new Product();
        TList<Product> dsProduct= productManager.GetAll();

        DropDownList ddlProducts = Grid.Rows[e.Row.RowIndex].Cells[1].Controls[0].FindControl("ddlProductNames") as DropDownList;
        if (dsProduct != null)
        {
            DataView dvProduct = new DataView(dsProduct.ToDataSet(true).Tables[0]);
            dvProduct.Sort = "name asc";
            ddlProducts.DataSource = dvBrand;
            ddlProducts.DataTextField = "name";
            ddlProducts.DataValueField = "productId";
            ddlProducts.DataBind();
            ListItem li = new ListItem("No Product Selected", "0");
            ddlProducts.Items.Insert(0, li); 
        }
    }

我正在排除DropDownList ddlProducts = Grid.Rows[e.Row.RowIndex].Cells[1].Controls[0].FindControl("ddlProductNames") as DropDownList;行中的索引。我正在学习这个过程,所以我会感谢一些帮助,包括我做错了什么以及我需要改变什么。我真的很感激任何帮助。

1 个答案:

答案 0 :(得分:1)

您必须使用FindControl在TemplateField中查找控件。您还需要排除标题行:

protected void Grid_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        DataRow row = ((DataRowView)e.Row.DataItem).Row;
        DropDownList ddlProducts = (DropDownList)e.Row.FindControl("ddlProductNames");
        ddlProducts.DataSource = someDataSource;
        ddlProducts.DataTextField = "name";
        ddlProducts.DataValueField = "productId";
        ddlProducts.DataBind();
    }
}

您也无需为网格中的每一行调用productManager.GetAll()。您只需要获取当前行的产品。如果每行的源都相同,则应在将GridView绑定为成员变量之前创建它。然后,您不需要为每一行检索相同的数据。