如何隱藏圖像控制器？

Question

我在我的頁面中有五個圖像控制器。我想隱藏圖像控制器，如果他們沒有任何圖像。現在我正在接受像下面給出的。

代碼：

DataTable dt = new DataTable(); 
dt = tt.GetImage(Ids); 
foreach (DataRow row in dt.Rows) 
{ 
    byte[] img1 = (byte[])row["Im1"]; 
    string base1 = Convert.ToBase64String(img1); 
    Image1.ImageUrl = "data:image/jpg;base64," + base1; 

    byte[] img2 = (byte[])row["Im2"]; 
    string base2 = Convert.ToBase64String(img2); 
    Image2.ImageUrl = "data:image/jpg;base64," + base2 ; 

    byte[] img3 = (byte[])row["Im3"]; 
    string base3 = Convert.ToBase64String(img3); 
    Image3.ImageUrl = "data:image/jpg;base64," + base3 ; 

    byte[] img4 = (byte[])row["Im4"]; 
    string base4 = Convert.ToBase64String(img4); 
    Image4.ImageUrl = "data:image/jpg;base64," + base4 ; 

    byte[] img5 = (byte[])row["Im5"]; 
    string base5 = Convert.ToBase64String(img5); 
    Image5.ImageUrl = "data:image/jpg;base64," + base5 ; 
} 

ASPX：

<asp:Image ID="Image1" runat="server" Width="559px" Height="210px"/> 
<br /> 
<asp:Image ID="Image2" runat="server" Width="559px" Height="210px"/> 
<br /> 
<asp:Image ID="Image3" runat="server" Width="559px" Height="210px"/> 
<br /> 
<asp:Image ID="Image4" runat="server" Width="559px" Height="210px"/> 
<br /> 
<asp:Image ID="Image5" runat="server" Width="559px" Height="210px"/> 

Answer 1

看看這會幫助你，我沒有測試它。

 DataTable dt = new DataTable(); 
     dt = tt.GetImage(Ids); 

     foreach (DataRow row in dt.Rows) 
     { 
      byte[] img1 = (byte[])row["Im1"]; 
      string base1 = Convert.ToBase64String(img1); 
      Image1.ImageUrl = "data:image/jpg;base64," + img1; 
      Image1.Visible = (!string.IsNullOrEmpty(base1)); 

      byte[] img2 = (byte[])row["Im2"]; 
      string base2 = Convert.ToBase64String(img2); 
      Image2.ImageUrl = "data:image/jpg;base64," + base2; 
      Image2.Visible = (!string.IsNullOrEmpty(base2)); 

      byte[] img3 = (byte[])row["Im3"]; 
      string base3 = Convert.ToBase64String(img3); 
      Image3.ImageUrl = "data:image/jpg;base64," + base3; 
      Image3.Visible = (!string.IsNullOrEmpty(base3)); 

      byte[] img4 = (byte[])row["Im4"]; 
      string base4 = Convert.ToBase64String(img4); 
      Image4.ImageUrl = "data:image/jpg;base64," + base4; 
      Image4.Visible = (!string.IsNullOrEmpty(base4)); 

      byte[] img5 = (byte[])row["Im5"]; 
      string base5 = Convert.ToBase64String(img5); 
      Image5.ImageUrl = "data:image/jpg;base64," + base5; 
      Image5.Visible = (!string.IsNullOrEmpty(base5)); 
     }