I'm trying to create a delete-page for the user to delete a selected image-files in a photoalbum. I just don't know how to select the database table row "navn" ("name" in english) using an url querystring.
Should I make a new SqlConnection and selectcommand for this line?
I'm not really sure, what to do, as i have just started learning the basics in ASP.NET, C# and SQL.
(I hope the danish entries aren't too confusing. You're welcome to ask if something doesn't make sense.)
I think maybe I should put something after the Request.QueryString
to select the "navn"-row in the table.
File.Delete(Server.MapPath("~/upload/originals/" +
Request.QueryString["id"].ToString()));
Db table "billeder" ("images" in english):
- Id [Int]
- imgnavn [Nvarchar]
- thumbnavn [Nvarchar]
- alt [Nvarchar]
- oprettetDen (date created) [DateTime]
- redigeretDen (last changed) [DateTime]
Below is the complete code for the aspx-page and code behind file:
("sletBtn" is "delete-button")
sletBilleder.aspx
<%@ Page Title="" Language="C#" MasterPageFile="~/admin/AdminMasterPage.master" AutoEventWireup="true" CodeFile="SletBilleder.aspx.cs" Inherits="admin_SletBilleder" %>
<asp:Content ID="Content1" ContentPlaceHolderID="head2" Runat="Server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder3" Runat="Server">
<table>
<tr>
<th>
<label>Billede-ID</label>
</th>
<th>
<label>Billede-navn</label>
</th>
</tr>
<tr>
<td>
<asp:Label ID="billedeID" runat="server"></asp:Label>
</td>
<td>
<asp:Label ID="billedenavn" runat="server"></asp:Label>
</td>
</tr>
</table>
<asp:Label ID="Label_msg" runat="server"></asp:Label>
<asp:Button ID="sletBtn" runat="server" Text="Slet billedet"
OnClick="sletBtn_Click" />
<asp:Button ID="tilAlbumBtn" runat="server" Text="Gå tilbage"
OnClick="tilAlbumBtn_Click" />
</asp:Content>
sletBilleder.aspx.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.IO;
using System.Data.SqlClient;
using System.Configuration;
using System.Data;
public partial class admin_SletBilleder : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
Label_msg.Text = "<div class='span6 offset1'><div class='alert alert-success'>Er du sikker på, at du vil slette billedet</div></div>";
}
// opret forbindelse til databasen
SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString"].ToString());
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
// SQL strengen
cmd.CommandText = "SELECT * FROM [billeder] WHERE [Id] = @Id";
cmd.Parameters.Add("@Id", SqlDbType.Int).Value = Request.QueryString["id"];
//åben for forbindelsen til databasen
conn.Open();
SqlDataReader reader = cmd.ExecuteReader();
if (reader.Read())
{
billedeID.Text = reader["Id"].ToString();
billedenavn.Text = reader["imgnavn"].ToString();
}
// Luk for forbindelsen til databasen
// reader.Close();
conn.Close();
}
protected void sletBtn_Click(object sender, EventArgs e)
{
try
{
// slet Originalfilen i image/upload/Original/ mappen
File.Delete(Server.MapPath("~/upload/originals/" + Request.QueryString["id"].ToString()));
// Slet Thumbsfilen i /Images/Upload/Thumbs/
File.Delete(Server.MapPath("~/upload/thumbs/" + Request.QueryString["id"].ToString()));
// Slet Resized_Original i /Images/Upload/Resized_Original/ mappen
File.Delete(Server.MapPath("~/upload/originalsResized/" + Request.QueryString["id"].ToString()));
// slet filen i databasen
SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString"].ToString());
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
cmd.CommandText = "DELETE FROM Billeder WHERE Id = @ImageId";
cmd.Parameters.Add("@ImageId", SqlDbType.Int).Value = Request.QueryString["id"].ToString();
conn.Open();
cmd.ExecuteNonQuery();
conn.Close();
//Redirect til Galleri
Response.Redirect("default.aspx");
}
catch (Exception)
{
Label_msg.Text = "<div class='span6 offset1'><div class='alert alert-success'>Billedet blev desværre <b>ikke</b> slettet</div></div>";
}
}
protected void tilAlbumBtn_Click(object sender, EventArgs e)
{
Response.Redirect("visBilleder.aspx?id=" + Request.QueryString["id"]);
}
}