如何从SQL Server数据库中检索图像字段civilimage1，civilimage2，以在带有vb.net或c＃的ASP.NET中使用图像控件进行显示？

Question

我在SQL Server数据库字节数组中有一些图像，我想在ASP.NET中检索这些图像。 但我没有得到images.Picture写在文件夹内，但我不能在图像控制器中播种它们。

请解决我的问题。

Private Sub CusImgShow1()
{
    Const SQL As String = "SELECT civilimg1 , civilimg2 FROM [NewCus] WHERE [Cust_ID] = @Cust_ID"
    Dim myCommand As New SqlCommand(SQL, myConnection)

    myCommand.Parameters.AddWithValue("@Cust_ID", Convert.ToInt32(Request.QueryString("Cust_ID")))
    myConnection.Open()
    Dim dr As SqlDataReader = myCommand.ExecuteReader()

    Try
            If dr.Read() Then
                Dim image As String = Convert.ToString(DateTime.Now.ToFileTime()) & "1"
                Dim image3 As String = Convert.ToString(DateTime.Now.ToFileTime()) & "2"
                Dim fs1 As New FileStream(("~/CRM/imagesb/" & image), FileMode.Create, FileAccess.Write)
                Dim fs2 As New FileStream(("~/CRM/imagesb/" & image3), FileMode.Create, FileAccess.Write)
                Dim bimage1 As Byte() = DirectCast(dr("civilimg1"), Byte())
                Dim bimage2 As Byte() = DirectCast(dr("civilimg2"), Byte())
                fs1.Write(bimage1, 0, bimage1.Length - 1)
                fs2.Write(bimage2, 0, bimage2.Length - 1)
                fs1.Flush()
                fs2.Flush()
                Image1.ImageUrl = "~/CRM/imagesb/" & image
                Image2.ImageUrl = "~/CRM/imagesb/" & image3
           'Dim base64String As String = Convert.ToBase64String(bimage1, 0, bimage1.Length)
                'Image1.ImageUrl = Convert.ToString("image/JPEG") & base64String
            End If

            myConnection.Close()
        Catch ex As Exception
            Throw ex
        End Try
}

Answer 1

1）创建一个句柄（.ashx）文件，该文件从查询字符串获取图像名称并将图像发送到浏览器

public class Myandler : IHttpHandler
{
  public void ProcessRequest(HttpContext context)
  {
     byte[] fileBytes;
     string fileName;

     //...get from byte[] from SQL Server

       context.Response.Clear();
       context.Response.ClearContent();
       context.Response.ClearHeaders();
       context.Response.Buffer = true;
       context.Response.ContentType = "application/octet-stream";
       context.Response.AddHeader("Content-Length", fileBytes.Length.ToString());
       context.Response.AddHeader("Content-Disposition", "attachment; filename=" + fileName);
       context.Response.BinaryWrite(fileBytes);
       context.Response.Flush();

  }
 }

2）进入HTML页面

 <img src="MyHandler.ashx?ImageId=123">

注意：对不起，我的代码是c＃....
注意2：这只是一个示例答案..您可以加密查询字符串，验证用户等