<%@ Import Namespace="System.Runtime.Serialization" %>
<%@ Import Namespace="System.Xml.Serialization" %>
<%@ Import Namespace="System.Data" %>
<%@ Page language="c#" %>
private catalog Catalog;
private string xmlPath;
private void Page_Load(object sender, System.EventArgs e) {
xmlPath = Server.MapPath("cdcatalog.xml");
if(Catalog==null) {
Catalog = LoadData(xmlPath);
foreach(catalogCD cd in Catalog.Items) {
titleDropDownList.Items.Add(new System.Web.UI.WebControls.ListItem(cd.title));
}
}
}
private catalog LoadData(string path) {
try {
System.IO.FileStream fs = System.IO.File.OpenRead(path);
byte[] buff = new byte[fs.Length];
fs.Read(buff, 0, (int)fs.Length);
fs.Close();
Catalog = (catalog)Serialization.DeSerializeXML(System.Text.ASCIIEncoding.ASCII.GetString(buff), typeof(catalog));
return Catalog;
} catch(Exception) {
return null;
}
}
private void DropDownList1_SelectedIndexChanged(object sender, System.EventArgs e) {
string findvalue = titleDropDownList.SelectedItem.Text;
foreach(catalogCD cd in Catalog.Items) {
if(cd.title==findvalue) {
artistTextBox.Text=cd.artist;
countryTextBox.Text=cd.country;
companyTextBox.Text=cd.company;
priceTextBox.Text=cd.price;
yearTextBox.Text=cd.year;
break;
}
}
}
private void SaveButton_Click(object sender, System.EventArgs e) {
string findvalue = titleDropDownList.SelectedItem.Text;
catalogCD foundcd=null;
foreach(catalogCD cd in Catalog.Items) {
if(cd.title==findvalue) {
foundcd=cd;
break;
}
}
if(foundcd!=null) {
foundcd.artist=artistTextBox.Text;
foundcd.country=countryTextBox.Text;
foundcd.company=companyTextBox.Text;
foundcd.price=priceTextBox.Text;
foundcd.year=yearTextBox.Text;
System.IO.MemoryStream data = Serialization.SerializeXML(Catalog, typeof(catalog));
byte[] databytes = data.ToArray();
if(System.IO.File.Exists(xmlPath)) System.IO.File.Delete(xmlPath);
System.IO.FileStream f = System.IO.File.OpenWrite(xmlPath);
f.Write(databytes, 0, databytes.Length);
f.Close();
}
}
[System.Xml.Serialization.XmlRootAttribute("catalog", Namespace="", IsNullable=false)]
public class catalog {
[System.Xml.Serialization.XmlElementAttribute("cd")]
public catalogCD[] Items;
}
public class catalogCD {
public string title;
public string artist;
public string country;
public string company;
public string price;
public string year;
}
public class Serialization {
public static System.IO.MemoryStream SerializeXML(object request, System.Type type) {
try {
System.Xml.Serialization.XmlSerializer serializer = new System.Xml.Serialization.XmlSerializer(type);
System.IO.MemoryStream stm = new System.IO.MemoryStream();
serializer.Serialize(stm, request);
return stm;
} catch(Exception e){
return null;
}
}
public static object DeSerializeXML(string envelope, System.Type type) {
try {
System.Xml.Serialization.XmlSerializer serializer = new System.Xml.Serialization.XmlSerializer(type);
System.IO.MemoryStream stm = new System.IO.MemoryStream(System.Text.Encoding.ASCII.GetBytes(envelope));
object ud = serializer.Deserialize(stm);
stm.Close();
return ud;
} catch(Exception e){
return null;
}
}
}
Creating a Class from an XML Document
Title:
Artist:
Country:
Company:
Price:
Year: