Question

<asp:TemplateField HeaderText="Status" ItemStyle-Width="15%">
                                <ItemTemplate>
                                    <asp:Image ID="Status" runat="server" />
                                </ItemTemplate>
                            </asp:TemplateField>

我在网格视图中有这个列，并且我的表中没有列作为状态，我使用rowdatabound来显示基于其他列中的值的图像，

   protected void MyGrid_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            Image img = (Image)e.Row.FindControl("Status");
            DateTime received;
            DateTime read;
            DateTime.TryParse(Convert.ToString(DataBinder.Eval(e.Row.DataItem, "TimeReceived")), out received);
            DateTime.TryParse(Convert.ToString(DataBinder.Eval(e.Row.DataItem, "TimeRead")), out read);
            if (received == DateTime.MinValue)
            {
                img.ImageUrl = "Styles/Images/red.png";
                img.ToolTip = "Message Not Received";
            }
            else (read == DateTime.MinValue)
            {
                img.ImageUrl = "Styles/Images/amber.png";
                img.ToolTip = "Message Received";
            }
                          img.Visible = true;
        }
    }

如何对状态列进行排序，其他列我将排序表达式作为列名称，我正在对其进行排序。但对于带有图像的列，我该如何进行排序。

Answer 1

我通常已经在后端设置中拥有了一个属性来保存“状态”，然后您可以对其进行排序并仍然应用您的UI逻辑。

<asp:TemplateField HeaderText="Status" SortExpression="MessageStatus">
    <ItemTemplate>
       <asp:Image ID="Status" runat="server" />
    </ItemTemplate>
</asp:TemplateField>


public YourObject
{
   public string MessageStatus {get; set;}
   ..........
}

在调用查询时将逻辑放在业务层中：

//call db
//fill object
   //while filling object
     DateTime received = this.TimeReceived
     DateTime read = this.TimeRead          
     if (received == DateTime.MinValue)
     {  
         MessageStatus  = "Message Not Received";
     }
     else (read == DateTime.MinValue)
     {
         MessageStatus  = "Message Received";
     }

<强>的RowDataBound：

protected void MyGrid_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        Image img = (Image)e.Row.FindControl("Status");

        string messsageStatus = DataBinder.Eval(e.Row.DataItem, "MessageStatus") as string;

        if (messsageStatus == "Message Not Received")
        {
            img.ImageUrl = "Styles/Images/red.png";
            img.ToolTip = messsageStatus ;
        }
        else if (messsageStatus == "Message Received")
        {
            img.ImageUrl = "Styles/Images/amber.png";
            img.ToolTip = messsageStatus ;
        }
        img.Visible = true;
    }
}

Answer 2

在模板中添加SortExpression，为您可以排序的其他字段命名。

<asp:TemplateField HeaderText="Status" SortExpression="SomeOtherColumn">
    <ItemTemplate>
       <asp:Image ID="Status" runat="server" />
    </ItemTemplate>
</asp:TemplateField>

如何对具有图像的网格视图列进行排序

2 个答案: