Question

我有这样的gridview（AllItems）：

enter image description here

从列表中提取项目设备名称，数量，日期时间，备份时间和电源： AllItems.DataSource = LST;

项目TotalWatts，Wh / Nyt，Wh / Day必须由本地整数变量提取，但是指定的数据源不包含TotalWatts的值

我该怎么办才能使我的网格视图也接受局部变量...... ??

gridview的代码：

<asp:GridView ID="AllItems" runat="server" AutoGenerateColumns="false" Height="124px" Width="191px" BackColor="White" BorderColor="#CCCCCC" BorderStyle="None" BorderWidth="1px" CellPadding="4" ForeColor="Black" GridLines="Horizontal" OnDataBound="AllItems_DataBound" ShowFooter="true" FooterStyle-BackColor="Black">
                <Columns>
                    <asp:BoundField DataField="Applianc.Name" HeaderText="Appliance Name" />
                    <asp:BoundField DataField="Quantity" HeaderText="Quantity" />
                    <asp:BoundField DataField="DayTime" HeaderText="Day Time(Hrs)" />
                    <asp:BoundField DataField="BackUpTime" HeaderText="BackUp Time(Hrs)" />
                    <asp:BoundField DataField="Applianc.Power"  HeaderText="Power(Watts)" />
                   <asp:BoundField DataField="TotalWatts" HeaderText="Total Watts" />
                    <asp:BoundField DataField="HrsNight" HeaderText="Wh/Nyt" />
                    <asp:BoundField DataField="HrsDay" HeaderText="Wh/Day" />

                </Columns>
                <FooterStyle   BackColor="Black" ForeColor="White" Font-Italic="true" />
                <FooterStyle BackColor="#CCCC99" ForeColor="Black" />
                <HeaderStyle BackColor="#333333" Font-Bold="True" ForeColor="White" />
                <PagerStyle BackColor="White" ForeColor="Black" HorizontalAlign="Right" />
                <SelectedRowStyle BackColor="#CC3333" Font-Bold="True" ForeColor="White" />
                <SortedAscendingCellStyle BackColor="#F7F7F7" />
                <SortedAscendingHeaderStyle BackColor="#4B4B4B" />
                <SortedDescendingCellStyle BackColor="#E5E5E5" />
                <SortedDescendingHeaderStyle BackColor="#242121" />
            </asp:GridView>

按钮点击后面的代码

protected void BtnAddNext_Click(object sender, EventArgs e)
    {
        List<Entity.UserSiteLoad> LstUsl = (List<Entity.UserSiteLoad>)Session["MyApplianceList"];
        e_usl.Applianc = new Entity.Appliance();
        calcObj = new CalculatorTest();

        e_usl.IdUserSiteLoad = Guid.NewGuid().ToString();
        e_usl.IdUserHousing = "xxx";
        e_usl.IdAppliance = DDLAppName.SelectedItem.Value.ToString(); //<<------------
        e_usl.Applianc.Name = DDLAppName.SelectedItem.Text;
        e_usl.Applianc.Power = new Random().Next(20, 500);
        e_usl.Quantity = Convert.ToInt32(QtyTB.Text);
        e_usl.DayTime = Convert.ToInt32(DayTymTB.Text);
        e_usl.BackUpTime = Convert.ToInt32(BackUpTymTB.Text);
        e_usl.CreatedBy = "sana";
        e_usl.CreatedDate = DateTime.Now;
        //e_usl.CreationDate = DateTime.Now;
        e_usl.ModifiedBy = "sana";
        e_usl.ModifiedDate = DateTime.Now;
        e_usl.IsActive = true;
        e_usl.IsDeleted = false;
        if (LstUsl.Count != 0)
        {
            for (int rowIndex = 0; rowIndex < LstUsl.Count; rowIndex++)
            {
                string AppName = LstUsl[rowIndex].Applianc.Name;
                if (AppName == DDLAppName.SelectedItem.Text)
                {
                    LstUsl.Remove(LstUsl[rowIndex]);
                }

            }
        }
        if (LstUsl.Count == 0 || LstUsl.Count > 0)
        {
            LstUsl.Add(e_usl);
        }
        Session["MyApplianceList"] = LstUsl;
        currentIndex = LstUsl.Count - 1; //int variable
        TotalWatts = calcObj.GetTotalWattsOfEachAppliance(currentIndex); //int variable
        HrsNight = calcObj.GetWattsHrPerNight(currentIndex); //int variable
        HrsDay = calcObj.GetWattsHrPerDayForEachAppliance(currentIndex); //int variable

        Response.Write("List Count is: " + LstUsl.Count); //check
        AllItems.DataSource = LstUsl;
        AllItems.DataBind();
        AllItems.Visible = true;

        Session["MyApplianceList"] = LstUsl;


    }

Answer 1

您的列表不包含以下变量（属性/列）。

TotalWatts = calcObj.GetTotalWattsOfEachAppliance(currentIndex); //int variable
HrsNight = calcObj.GetWattsHrPerNight(currentIndex); //int variable
HrsDay = calcObj.GetWattsHrPerDayForEachAppliance(currentIndex); //int variable

您无法为属性DataField <asp:BoundField DataField="TotalWatts"/>分配公共变量值，TotalWatts应该存在于列表中（您的dataSource）。

您应该使用模板字段，如。

替换

<asp:BoundField DataField="TotalWatts" HeaderText="Total Watts" />

通过

<asp:TemplateField HeaderText="ListsID" Visible="true">
  <ItemTemplate>
    <asp:Literal ID="litListsID" runat="server" Text='<%# TotalWatts.ToString() %>'>
      </asp:Literal>
      </ItemTemplate>
    <HeaderStyle HorizontalAlign="Left" VerticalAlign="Top" />
</asp:TemplateField>

TotalWatts 应该是一个公共变量你也可以在这里使用你的功能。

<asp:Literal ID="litListsID" runat="server" Text='<%# calcObj.GetTotalWattsOfEachAppliance(yourParameter) %>'>

Answer 2

以下是一个简单的例子希望这将完美地解决上述情况我有一个有三个领域的产品清单。

 public class Product
 {
   public int ID { get; set; }
   public string Name { get; set; }
   public double UnitPrice { get; set; }
 }

我想在gridview中显示这三个字段，还在gridview中显示一个从列的现有列派生的额外列。即

ID , Name , UnitPrice , and DozenPrice(means UnitPrice * 12)

请参阅代码，希望任何人都可以解决他们显示派生列的问题

public partial class _Default : System.Web.UI.Page
{ 
    protected void Page_Load(object sender, EventArgs e)
    {
        fillGrid();
    }
    public class Product
    {
        public int ID { get; set; }
        public string Name { get; set; }
        public double UnitPrice { get; set; }
    }
    public void fillGrid()
    {
        var ListProduct = new List<Product>();
        ListProduct.Add(new Product() { ID = 1, Name = "item1", UnitPrice = 4.5 });
        ListProduct.Add(new Product() { ID = 1, Name = "item1", UnitPrice = 4.5 });
        ListProduct.Add(new Product() { ID = 1, Name = "item1", UnitPrice = 4.5 });
        ListProduct.Add(new Product() { ID = 1, Name = "item1", UnitPrice = 4.5 });
        GridView1.DataSource = ListProduct;
        GridView1.DataBind();
    }
    protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {     
        int Dozen = 12;
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            Product row = ((Product)e.Row.DataItem);
            double UnitPrice = row.UnitPrice;
            ((Literal)e.Row.FindControl("ltrDozenPrice")).Text = Convert.ToString(UnitPrice * Dozen);
        }
    }    
}

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" onrowdatabound="GridView1_RowDataBound">
    <Columns>
        <asp:BoundField DataField="ID" HeaderText="ID" />
        <asp:BoundField DataField="Name" HeaderText="Name" />
        <asp:BoundField DataField="UnitPrice" HeaderText="Unit Price" />
        <asp:TemplateField HeaderText="DozenPrice">
            <ItemTemplate>
                <asp:Literal ID="ltrDozenPrice"  runat="server"></asp:Literal>
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

如何让gridview显示除关联数据源之外的数据？

2 个答案: