从数据库在网络表单上显示图像

Question

The image is saved in oracle database in BLOB field.Now I want to show this image on my web form.I am using the code below but it's not working

C# CODE :

DataTable dt=new DataTable();
            dt=emppersonal.GetPhoto(Session["empcd"].ToString());
            byte[] barrImg = (byte[])dt.Rows[0]["photo"];
            string base64String = Convert.ToBase64String(barrImg);
            UserImage.ImageUrl = "data:image/jpeg;base64," + base64String; 

ASPX CODE:

   <asp:Image ID="UserImage"  runat="server" />

Answer 1

try this. hope it helps

            DataTable dt = new DataTable();
            dt = emppersonal.GetPhoto(Session["empcd"].ToString());
            byte[] barrImg = (byte[])dt.Rows[0]["photo"];
            string base64String = Convert.ToBase64String(barrImg, 0, barrImg.Length);
            UserImage.ImageUrl = "data:image;base64," + base64String;

Answer 2

Create a ImageHandler.ashx file with the code as follows:

public void ProcessRequest (HttpContext context) {
    try
    {
        string empcd = context.Request.QueryString["empcd"].ToString();
        string conStr = WebConfigurationManager.ConnectionStrings["DatabaseConnectionString1"].ConnectionString;

        SqlConnection con = new SqlConnection(conStr);
        SqlCommand cmd = new SqlCommand("select photo from mytable where id = @empcd", con);
        cmd.Parameters.Add("@empcd", SqlDbType.Int).Value = empcd;
        con.Open();
        string data = cmd.ExecuteScalar().ToString();
        con.Close();
        cmd.Dispose();
        context.Response.BinaryWrite(Convert.FromBase64String(data));
    }
    catch (Exception ex)
    {
        //if some exceptions will occur
    }
}

public bool IsReusable {
    get {
        return false;
    }
}

And in your .aspx page:

<asp:Image runat="server" ID="imgPhoto" ImageUrl="ImageHandler.ashx?empcd=some_value_here" />

You need to change a sql-query as you need.

Hope this helps.