如果值為空，則更改gridview背景顏色

Question

如果gridview中的值為空，我有這個問題來更改gridview顏色。 我使用templatefield生成gridview。 我使用了這段代碼，除了標題之外，它在gridview中全部更改：

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        //change it according your cell number or find element
        if (e.Row.Cells[0].Text != "")
            e.Row.BackColor = System.Drawing.Color.White;
        else
            e.Row.BackColor = System.Drawing.Color.Red;
    }


}

這是我的后台代碼，我指定gridview：

 <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" OnRowDataBound="GridView1_RowDataBound" >
   <Columns>
     <asp:TemplateField HeaderText="Request Date">
       <ItemTemplate><%#Eval("request_date")%></ItemTemplate>
         </asp:TemplateField>

     <asp:TemplateField HeaderText="A01">
         <ItemTemplate>
           <%#Eval("prod_line").ToString() == "A01" ? "Job Order:" 
           +Eval("jo_no") +"\n\n\n\n\nQuantity: "
           +Eval("qty")+"\n\n\n\n\nNeed by Date:" 
           +Eval("need_by_date")+"\n\n\n\n\nStatus: "
           +Eval("process_id") : ""  %>
         </ItemTemplate>
    </asp:TemplateField>

    <asp:TemplateField HeaderText="A02">
      <ItemTemplate>
         <%#Eval("prod_line").ToString() == "A02" ?"Job Order: " 
           +Eval("jo_no") +"\n\n\n\n\nQuantity: "
           +Eval("qty")+"\n\n\n\nNeed by Date: "     
           +Eval("need_by_date")+"\n\n\n\n\nStatus: "+Eval("process_id") : ""   %>
     </ItemTemplate>
   </asp:TemplateField>

   <asp:TemplateField HeaderText="A03">
     <ItemTemplate>
       <%#Eval("prod_line").ToString() == "A03" ? "Job Order: " 
         +Eval("jo_no") +"\n\n\n\n\nQuantity: "
         +Eval("qty")+"\n\n\n\nNeed by Date: " 
         +Eval("need_by_date")+"\n\n\n\n\nStatus: "+Eval("process_id") : ""   %>
     </ItemTemplate>
   </asp:TemplateField>

   <asp:TemplateField HeaderText="A04">
     <ItemTemplate>
       <%#Eval("prod_line").ToString() == "A04" ? "Job Order: " 
         +Eval("jo_no") +"\n\n\n\n\nQuantity: "
         +Eval("qty")+"\n\n\n\nNeed by Date: " 
         +Eval("need_by_date")+"\n\n\n\n\nStatus: "+Eval("process_id") : ""   %>
     </ItemTemplate>
   </asp:TemplateField>

   <asp:TemplateField HeaderText="A05">
     <ItemTemplate>
       <%#Eval("prod_line").ToString() == "A05" ? "Job Order: " 
         +Eval("jo_no") +"\n\n\n\n\nQuantity: "
         +Eval("qty")+"\n\n\n\nNeed by Date: " 
         +Eval("need_by_date")+"\n\n\n\n\nStatus: "+Eval("process_id") : ""   %>
     </ItemTemplate>
   </asp:TemplateField>

   <asp:TemplateField HeaderText="A06">
     <ItemTemplate>
       <%#Eval("prod_line").ToString() == "A06" ? "Job Order: " 
         +Eval("jo_no") +"\n\n\n\n\nQuantity: "
         +Eval("qty")+"\n\n\n\nNeed by Date: " 
         +Eval("need_by_date")+"\n\n\n\n\nStatus: "+Eval("process_id") : ""   %>
      </ItemTemplate>
   </asp:TemplateField>

   <asp:TemplateField HeaderText="A07">
     <ItemTemplate>
       <%#Eval("prod_line").ToString() == "A07" ? "Job Order: " 
         +Eval("jo_no") +"\n\n\n\n\nQuantity: "
         +Eval("qty")+"\n\n\n\nNeed by Date: "      
         +Eval("need_by_date")+"\n\n\n\n\nStatus: "+Eval("process_id") : ""  %>
     </ItemTemplate>
   </asp:TemplateField>

   <asp:TemplateField HeaderText="A08">
     <ItemTemplate>
       <%#Eval("prod_line").ToString() == "A08" ? "Job Order: " 
         +Eval("jo_no") +"\n\n\n\n\nQuantity: "
         +Eval("qty")+"\n\n\n\nNeed by Date: " 
         +Eval("need_by_date")+"\n\n\n\n\nStatus: "+Eval("process_id") : ""   %>
     </ItemTemplate>
   </asp:TemplateField>

   <asp:TemplateField HeaderText="A09">
     <ItemTemplate>
        <%#Eval("prod_line").ToString() == "A09" ? "Job Order: " 
          +Eval("jo_no") +"\n\n\n\n\nQuantity: "
          +Eval("qty")+"\n\n\n\nNeed by Date: " 
          +Eval("need_by_date")+"\n\n\n\n\nStatus: "+Eval("process_id") : ""   %>
     </ItemTemplate>
   </asp:TemplateField>

   <asp:TemplateField HeaderText="A10">
     <ItemTemplate>
       <%#Eval("prod_line").ToString() == "A10" ?"Job Order: "
          +Eval("jo_no") +"\n\n\n\n\nQuantity: "
          +Eval("qty")+"\n\n\n\nNeed by Date: " 
          +Eval("need_by_date")+"\n\n\n\n\nStatus: "
          +Eval("process_id") : ""   %>
     </ItemTemplate>
   </asp:TemplateField>

   <asp:TemplateField HeaderText="A11">
     <ItemTemplate>
       <%#Eval("prod_line").ToString() == "A11" ? "Job Order: " 
         +Eval("jo_no") +"\n\n\n\n\nQuantity: "
         +Eval("qty")+"\n\n\n\nNeed by Date: " 
         +Eval("need_by_date")+"\n\n\n\n\nStatus: "
         +Eval("process_id") : ""   %>
     </ItemTemplate>
   </asp:TemplateField>

   <asp:TemplateField HeaderText="A12">
     <ItemTemplate>
       <%#Eval("prod_line").ToString() == "A12" ? "Job Order: " 
         +Eval("jo_no") +"\n\n\n\n\nQuantity: "
         +Eval("qty")+"\n\n\n\nNeed by Date: " 
         +Eval("need_by_date")+"\n\n\n\n\nStatus: "
         +Eval("process_id") : ""   %>
     </ItemTemplate>
   </asp:TemplateField>

   <asp:TemplateField HeaderText="A13">
     <ItemTemplate>
       <%#Eval("prod_line").ToString() == "A13" ?"Job Order: "
         +Eval("jo_no") +"\n\n\n\n\nQuantity: "
         +Eval("qty")+"\n\n\n\nNeed by Date: " 
         +Eval("need_by_date")+"\n\n\n\n\nStatus: "
         +Eval("process_id") : ""   %>
     </ItemTemplate>
   </asp:TemplateField>

   <asp:TemplateField HeaderText="A14">
     <ItemTemplate>
       <%#Eval("prod_line").ToString() == "A14" ? "Job Order: " 
         +Eval("jo_no") +"\n\n\n\n\nQuantity: "
         +Eval("qty")+"\n\n\n\nNeed by Date: " 
         +Eval("need_by_date")+"\n\n\n\n\nStatus: "
         +Eval("process_id") : ""  %>
     </ItemTemplate>
   </asp:TemplateField>

   <asp:TemplateField HeaderText="A15">
     <ItemTemplate>
       <%#Eval("prod_line").ToString() == "A15" ?"Job Order: "
         +Eval("jo_no") +"\n\n\n\n\nQuantity: "
         +Eval("qty")+"\n\n\n\nNeed by Date: " 
         +Eval("need_by_date")+"\n\n\n\n\nStatus: "
         +Eval("process_id") : ""   %>
     </ItemTemplate>
   </asp:TemplateField>

   <asp:TemplateField HeaderText="A16">
     <ItemTemplate>
       <%#Eval("prod_line").ToString() == "A16" ? "Job Order: " 
         +Eval("jo_no") +"\n\n\n\n\nQuantity: "
         +Eval("qty")+"\n\n\n\nNeed by Date: " 
         +Eval("need_by_date")+"\n\n\n\n\nStatus: "
         +Eval("process_id") : ""   %>
     </ItemTemplate>
   </asp:TemplateField>

   <asp:TemplateField HeaderText="A17">
     <ItemTemplate>
       <%#Eval("prod_line").ToString() == "A17" ?"Job Order: "
         +Eval("jo_no") +"\n\n\n\n\nQuantity: "
         +Eval("qty")+"\n\n\n\nNeed by Date: " 
         +Eval("need_by_date")+"\n\n\n\n\nStatus: "
         +Eval("process_id") : ""   %>
     </ItemTemplate>
   </asp:TemplateField>

   <asp:TemplateField HeaderText="A18">
     <ItemTemplate>
      <%#Eval("prod_line").ToString() == "A18" ? "Job Order: "
        +Eval("jo_no") +"\n\n\n\n\nQuantity: "
        +Eval("qty")+"\n\n\n\nNeed by Date: " 
        +Eval("need_by_date")+"\n\n\n\n\nStatus: "+Eval("process_id") : ""   %>
     </ItemTemplate>
   </asp:TemplateField>
  </Columns>
</asp:GridView>

我得到了這樣的輸出：

但我希望輸出如下：

Answer 1

看看代碼的這一部分，你會發現問題所在

 if (e.Row.Cells[0].Text != "")
        e.Row.BackColor = System.Drawing.Color.White;
    else
        e.Row.BackColor = System.Drawing.Color.Red;

如果單元格為空，則設置整行的背景顏色[e.Row.BackColor]
在行中設置單元格的顏色
像這樣

e.Row.Cells[0].BackColor = System.Drawing.Color.Red;

你可以用它來應用你的邏輯（無論你想要哪個單元格）

Answer 2

據我所知，你的單元格沒有任何價值，但是如果你通過放置斷點在RowDataBound事件處理程序中看到它，你可能會看到這樣的值  而不是空字符串。

您只需稍微修改RowDataBound的條件，如下所示：

if (string.IsNullOrEmpty(Server.HtmlDecode(e.Row.Cells[1].Text).Trim()))
      e.Row.BackColor = System.Drawing.Color.Red;

單元格中的值是htmlEncoded 。 您需要使用Server.HtmlDecode對其進行解碼，之后您的值將為" "字符串，其中包含一個空格，這就是我使用Trim()的原因，最后檢查該值是null or empty

這是經過測試的解決方案，它將起作用。