C# 4 and .NET 4

searching for User objects ❘ OC147
classes of user: Organizational-Person, Person, and Top. In this program, the names of the
base classes are hard-coded. You could also read the base class dynamically with the subClassOf
attribute.
GetSchemaProperties() returns IEnumerable with all property names of the specific object
type. All the property names are added to the list box:
private void SetUserProperties(string schemaNamingContext)
{
var properties = from p in GetSchemaProperties(schemaNamingContext,
"User").Concat(
GetSchemaProperties(schemaNamingContext,
"Organizational-Person")).Concat(
GetSchemaProperties(schemaNamingContext, "Top"))
orderby p
select p;
}
listBoxProperties.DataContext = properties;
code snippet UserSearch/MainWindow.xaml.cs
In GetSchemaProperties(), you are accessing the Active Directory service again. This time, rootDSE
is not used but rather the LDAP name of the schema that you discovered earlier. The property
systemMayContain holds a collection of all attributes that are allowed in the class objectType:
private IEnumerable GetSchemaProperties(string schemaNamingContext,
string objectType)
{
IEnumerable data;
using (var de = new DirectoryEntry())
{
de.Username = username;
de.Password = password;
}
de.Path = String.Format("LDAP://{0}CN={1},{2}", hostname, objectType,
schemaNamingContext);
PropertyValueCollection values = de.Properties["systemMayContain"];
data = from s in values.Cast()
orderby s
select s;
}
return data;
Step 2 in the application is completed. The ListBox control has all the property names of the
user objects.
search for user objects
The handler for the search button calls only the helper method FillResult():
private void OnSearch(object sender, RoutedEventArgs e)
{
try
{
FillResult();
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