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<%@ Import Namespace="System.Runtime.Serialization" %>
<%@ Import Namespace="System.Xml.Serialization" %>
<%@ Import Namespace="System.Data" %>
<%@ Page language="c#" %>
<script language="C#" runat="server">
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;
}
}
}
</script>
<HTML>
<HEAD>
<title>Creating a Class from an XML Document</title>
</HEAD>
<body>
<form id="Form1" method="post" runat="server">
<P>
<asp:Label id="titleLabel" runat="server">Title:</asp:Label>
<asp:DropDownList id="titleDropDownList" runat="server" Width="239px" AutoPostBack="True"
OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged"></asp:DropDownList></P>
<P>
<asp:Label id="artistLabel" runat="server">Artist:</asp:Label>
<asp:TextBox id="artistTextBox" runat="server"></asp:TextBox></P>
<P>
<asp:Label id="countryLabel" runat="server">Country:</asp:Label>
<asp:TextBox id="countryTextBox" runat="server"></asp:TextBox></P>
<P>
<asp:Label id="companyLabel" runat="server">Company:</asp:Label>
<asp:TextBox id="companyTextBox" runat="server"></asp:TextBox></P>
<P>
<asp:Label id="priceLabel" runat="server">Price:</asp:Label>
<asp:TextBox id="priceTextBox" runat="server"></asp:TextBox></P>
<P>
<asp:Label id="yearLabel" runat="server">Year:</asp:Label>
<asp:TextBox id="yearTextBox" runat="server"></asp:TextBox></P>
<P>
<asp:Button id="SaveButton" runat="server" Text="Save Changes" OnClick="SaveButton_Click"></asp:Button></P>
</form>
</body>
</HTML>
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