我的表单在gridview中有三列.一个是数量(下拉列表){如何添加此数量下拉列表?},其他是价格和金额.我想计算gridview内的数量.如果我选择数量“2”,那么它计算数量*价格.如何在gridview或任何其他选项中获取下拉列表的selectedindexchanged属性?
如何在gridview项中添加下拉列表?
如何在gridview内的下拉列表中添加值?
如何为asp.net中的gridview内的下拉列表编写selectedindexchanged事件的代码?
解决方法
你的问题有三个部分:
>如何在GridView中添加DropDownList?
>如何从GridView中的DropDownList中获取所选项?
>如何计算值并在GridView中显示?
这是我们如何做到的.首先在页面中添加此标记.我为产品名称添加了一个列,使其看起来更好:
- <asp:GridView ID="GridView1" AutoGenerateColumns="false" runat="server" OnRowDataBound="GridView1_RowDataBound">
- <Columns>
- <asp:BoundField DataField="Name" HeaderText="Name" />
- <asp:TemplateField HeaderText="Quantity">
- <ItemTemplate>
- <asp:DropDownList ID="ddlQuantity" runat="server" AutoPostBack="true" OnSelectedIndexChanged="ddlQuantity_SelectedIndexChanged"></asp:DropDownList>
- </ItemTemplate>
- </asp:TemplateField>
- <asp:TemplateField HeaderText="Price">
- <ItemTemplate>
- <asp:Label ID="lblPrice" Text='<%#Eval("Price") %>' runat="server" ></asp:Label>
- </ItemTemplate>
- </asp:TemplateField>
- <asp:TemplateField HeaderText="Amount">
- <ItemTemplate>
- <asp:Label ID="lblAmount" Text="0.00" runat="server" ></asp:Label>
- </ItemTemplate>
- </asp:TemplateField>
- </Columns>
- </asp:GridView>
如何在GridView中添加DropDownList
在Page_Load()中填充GridView(我使用了产品列表):
- protected void Page_Load(object sender,EventArgs e)
- {
- if (!IsPostBack)
- {
- //Test data to populate GridView
- GridView1.DataSource = new List<Product>()
- {
- new Product{ID=1,Name="Paper",Price=7.99M},new Product{ID=2,Name="Pen",Price=14.99M},new Product{ID=3,Name="Pencil",Price=1.99M}
- };
- GridView1.DataBind();
- }
- }
这将触发GridView的RowDataBound事件.在event方法中,我们将在每行中绑定DropDownList,如下所示:
- protected void GridView1_RowDataBound(object sender,GridViewRowEventArgs e)
- {
- if (e.Row.RowType == DataControlRowType.DataRow)
- {
- var ddl = e.Row.FindControl("ddlQuantity") as DropDownList;
- if (ddl != null)
- {
- ddl.DataSource = new List<string>() { "0","1","2","3","4" };
- ddl.DataBind();
- }
- }
- }
如何从GridView中的DropDownList中获取所选项目
如何计算值并在GridView中显示
当您更改DropDownList中的任何选择时,它将触发SelectedIndexChange事件.在那个事件方法中,我们可以找到哪个DropDownList被更改,而且它的“NamingContainer” – GridView的行保存它:
- protected void ddlQuantity_SelectedIndexChanged(object sender,EventArgs e)
- {
- GridViewRow gvr = ((DropDownList)sender).NamingContainer as GridViewRow ;
- if (gvr != null)
- {
- decimal price = 0.00M;
- int quantity = 0;
- //We can find all the controls in this row and do operations on them
- var ddlQuantity = gvr.FindControl("ddlQuantity") as DropDownList;
- var lblPrice = gvr.FindControl("lblPrice") as Label;
- var lblAmount = gvr.FindControl("lblAmount") as Label;
- if (ddlQuantity != null && lblPrice != null && lblAmount != null)
- {
- int.TryParse(ddlQuantity.SelectedValue,out quantity);
- decimal.TryParse(lblPrice.Text,out price);
- lblAmount.Text = (price * quantity).ToString();
- }
- }
- }
这是结果:
您可以下载测试项目here.