private HiddenField CreateClientStateField(ExtenderControlBase extender)
{
// add a hidden field so we'll pick up the value
//
HiddenField field = new HiddenField();
field.ID = GetClientStateFieldID(extender);
Controls.Add(field);
extender.ClientStateFieldID = field.ClientID;
return(field);
}
public void AddExtender(ExtenderControlBase control, IEnumerable <string> clientIDs, Control dependedControl)
{
if (registeredControls.ContainsKey(control.BehaviorID))
{
return;
}
_extenderControls.Add(new TripletItem(control, clientIDs, dependedControl));
registeredControls[control.BehaviorID] = true;
if (_loadedClientStateValues)
{
LoadClientStateValues(control);
}
}
public void AddExtender(ExtenderControlBase control, string clientID, Control dependedControl)
{
if (registeredControls.ContainsKey(control.BehaviorID))
{
return;
}
_extenderControls.Add(clientID == null
? new TripletItem(control, null, dependedControl)
: new TripletItem(control, new[] { clientID }, dependedControl));
registeredControls[control.BehaviorID] = true;
if (_loadedClientStateValues)
{
LoadClientStateValues(control);
}
}
private void SaveClientStateValues(ExtenderControlBase extender)
{
if (extender.EnableClientState)
{
HiddenField hiddenField = null;
if (string.IsNullOrEmpty(extender.ClientStateFieldID))
{
hiddenField = CreateClientStateField(extender);
}
else
{
hiddenField = (HiddenField)NamingContainer.FindControl(GetClientStateFieldID(extender));
}
if (hiddenField != null)
{
hiddenField.Value = extender.ClientState;
}
}
}
private void LoadClientStateValues(ExtenderControlBase extenderControl)
{
if (extenderControl.EnableClientState)
{
var hiddenField = (HiddenField)NamingContainer.FindControl(GetClientStateFieldID(extenderControl));
if (hiddenField != null)
{
if (string.IsNullOrEmpty(hiddenField.Value) && !string.IsNullOrEmpty(Page.Request.Params[hiddenField.UniqueID]))
{
hiddenField.Value = Page.Request.Params[hiddenField.UniqueID];
}
extenderControl.ClientState = hiddenField.Value;
}
else
{
var field = CreateClientStateField(extenderControl);
field.Value = Page.Request.Params[field.UniqueID];
extenderControl.ClientState = field.Value;
}
}
}
public static void DescribeComponent(object instance, ScriptComponentDescriptor descriptor,
IUrlResolutionService urlResolver, IControlResolver controlResolver)
{
// validate preconditions
if (instance == null)
{
throw new ArgumentNullException("instance");
}
if (descriptor == null)
{
throw new ArgumentNullException("descriptor");
}
if (urlResolver == null)
{
urlResolver = instance as IUrlResolutionService;
}
if (controlResolver == null)
{
controlResolver = instance as IControlResolver;
}
// describe properties
PropertyDescriptorCollection properties = TypeDescriptor.GetProperties(instance);
foreach (PropertyDescriptor prop in properties)
{
ExtenderControlPropertyAttribute propAttr = null;
ExtenderControlEventAttribute eventAttr = null;
string propertyName = prop.Name;
// Try getting a property attribute
propAttr = (ExtenderControlPropertyAttribute)prop.Attributes[typeof(ExtenderControlPropertyAttribute)];
if (propAttr == null || !propAttr.IsScriptProperty)
{
// Try getting an event attribute
eventAttr = (ExtenderControlEventAttribute)prop.Attributes[typeof(ExtenderControlEventAttribute)];
if (eventAttr == null || !eventAttr.IsScriptEvent)
{
continue;
}
}
// attempt to rename the property/event
ClientPropertyNameAttribute nameAttr =
(ClientPropertyNameAttribute)prop.Attributes[typeof(ClientPropertyNameAttribute)];
if (!string.IsNullOrEmpty(nameAttr.PropertyName))
{
propertyName = nameAttr.PropertyName;
}
object value = prop.GetValue(instance);
if (value == null)
{
continue;
}
// determine whether to serialize the value of a property. readOnly properties should always be serialized
bool serialize = prop.ShouldSerializeValue(instance) || prop.IsReadOnly;
if (serialize)
{
// get the value of the property, skip if it is null
Control c = null;
// convert and resolve the value
if (eventAttr != null && prop.PropertyType != typeof(String))
{
throw new InvalidOperationException(
"ExtenderControlEventAttribute can only be applied to a property with a PropertyType of System.String.");
}
else
{
if (!prop.PropertyType.IsPrimitive && !prop.PropertyType.IsEnum)
{
// Check if we can use any of our custom converters
// (first do a direct lookup on the property type,
// but also check all of its base types if nothing
// was found)
Converter <object, string> customConverter = null;
if (!_customConverters.TryGetValue(prop.PropertyType, out customConverter))
{
foreach (KeyValuePair <Type, Converter <object, string> > pair in _customConverters)
{
if (prop.PropertyType.IsSubclassOf(pair.Key))
{
customConverter = pair.Value;
break;
}
}
}
// Use the custom converter if found, otherwise use
// its current type converter
if (customConverter != null)
{
value = customConverter(value);
}
else
{
// Determine if we should let ASP.NET AJAX handle this type of conversion, as it supports JSON serialization
if (propAttr != null && propAttr.UseJsonSerialization)
{
if (value is IEnumerable)
{
List <object> lst = new List <object>();
foreach (object a in (IEnumerable)value)
{
object b;
Type typ = a.GetType();
if (a as IUICollectionItem != null)
{
b = a is UriValue
? urlResolver.ResolveClientUrl(((UriValue)a).Value.ToString())
: ((IUICollectionItem)a).Value;
}
else if (typ.IsPrimitive || typ.IsValueType)
{
b = a;
}
else
{
b = BuildGraph(a, urlResolver, controlResolver);
}
if (b != null)
{
lst.Add(b);
}
}
if (lst.Count > 0)
{
value = lst;
}
}
else if (value.GetType().IsPrimitive || value.GetType().IsValueType)
{
}
else
{
value = BuildGraph(value, urlResolver, controlResolver);
}
// Use ASP.NET JSON serialization
}
else
{
// Use the property's own converter
TypeConverter conv = prop.Converter;
value = conv.ConvertToString(null, CultureInfo.InvariantCulture, value);
}
}
}
if (prop.Attributes[typeof(IDReferencePropertyAttribute)] != null && controlResolver != null)
{
c = controlResolver.ResolveControl((string)value);
}
if (prop.Attributes[typeof(UrlPropertyAttribute)] != null && urlResolver != null)
{
value = urlResolver.ResolveClientUrl((string)value);
}
}
// add the value as an appropriate description
if (eventAttr != null)
{
descriptor.AddEvent(propertyName, (string)value);
}
else if (prop.Attributes[typeof(ElementReferenceAttribute)] != null)
{
if (c == null && controlResolver != null)
{
c = controlResolver.ResolveControl((string)value);
}
if (c != null)
{
value = c.ClientID;
}
descriptor.AddElementProperty(propertyName, (string)value);
}
else if (prop.Attributes[typeof(ComponentReferenceAttribute)] != null)
{
if (c == null && controlResolver != null)
{
c = controlResolver.ResolveControl((string)value);
}
if (c != null)
{
ExtenderControlBase ex = c as ExtenderControlBase;
if (ex != null && ex.BehaviorID.Length > 0)
{
value = ex.BehaviorID;
}
else
{
value = c.ClientID;
}
}
descriptor.AddComponentProperty(propertyName, (string)value);
}
else
{
if (c != null)
{
value = c.ClientID;
}
descriptor.AddProperty(propertyName, value);
}
}
}
// determine if we should describe methods
foreach (
MethodInfo method in
instance.GetType().GetMethods(BindingFlags.Instance | BindingFlags.Static | BindingFlags.Public))
{
ExtenderControlMethodAttribute methAttr =
(ExtenderControlMethodAttribute)
Attribute.GetCustomAttribute(method, typeof(ExtenderControlMethodAttribute));
if (methAttr == null || !methAttr.IsScriptMethod)
{
continue;
}
// We only need to support emitting the callback target and registering the WebForms.js script if there is at least one valid method
Control control = instance as Control;
if (control != null)
{
// Force WebForms.js
control.Page.ClientScript.GetCallbackEventReference(control, null, null, null);
// Add the callback target
descriptor.AddProperty("_callbackTarget", control.UniqueID);
}
break;
}
}
public void AddExtender(ExtenderControlBase control)
{
AddExtender(control, (IEnumerable <string>)null, null);
}
public void AddExtender(ExtenderControlBase control, IEnumerable <string> clientIDs)
{
AddExtender(control, clientIDs, null);
}
public void AddExtender(ExtenderControlBase control, string clientID)
{
AddExtender(control, clientID, null);
}
private string GetClientStateFieldID(ExtenderControlBase extender)
{
return(string.Format(CultureInfo.InvariantCulture, "{0}_ClientState", extender.ID));
}
