使用C#从SQL检索图像到asp:Image

时间:2013-01-28 03:44:28

标签: c# asp.net sql-server-2008-express

我正在尝试从SQL Server 2008 Express中检索图像并将其插入<ASP:Image>。我尝试使用MemoryStream,但我似乎无法做到正确。

我现在的C#代码如下:

  try
  {
     con.Open();

     SqlCommand sqlGetStep1 = new SqlCommand("staff_getStep1", con);
     {
         sqlGetStep1.CommandType = CommandType.StoredProcedure;
         sqlGetStep1.Parameters.Add(new SqlParameter("@taskID", Convert.ToInt16(taskID)));
         SqlDataReader step1 = sqlGetStep1.ExecuteReader();

         //Check if username exists
         if (step1.Read())
         {
            step1Text = (string)step1["step1Text"];
            step1Image = (byte)step1["step1Image"];

          }//if 
          else
          {
             step1Text = "null";
             step1Image = 0;
          }//else

           }//sqlDeleteNotification

       }//try
       catch (SqlException sqlEx)
       {
           lblSQLError.Visible = true;
           lblSQLError.Text = sqlEx.Message.ToString();
        }//catach sql
        catch (Exception ex)
       {
           lblError.Visible = true;
           lblError.Text = ex.ToString();

       }//Catch exception
       finally
       {
           con.Close();
       }//Finally

我希望显示图像的aspx代码如下:

<asp:Panel runat="server" ID="pnlStep1" Visible="false" CssClass="NormalText">        
   <asp:Label runat="server" ID="lblStep1Text" Text="Step 1 Instruction: "></asp:Label>
   <asp:TextBox runat="server" ID="txtStep1Text" Text="" ReadOnly="true"></asp:TextBox>
   <asp:Label runat="server" ID="lblStep1Image" Text="Step 1 Image: "></asp:Label>
   <asp:Image runat="server" ID="imgStep1" ImageUrl="" Height="100px" Width="100px"/>
</asp:Panel>

任何帮助都将非常感谢:)

1 个答案:

答案 0 :(得分:2)

您需要有一个单独的网址,用于获取要传递的图像的ID(在本例中为步骤ID),并将内容作为具有正确MIME类型的结果传递。使用此方法的网址作为asp:Image的网址。通常,您将(在WebForms中)实现为HttpHandler。见How to return an image as the response in ASP.NET