public static void DescribeComponent(object instance, IScriptComponentDescriptor 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;
ClientPropertyNameAttribute nameAttr = null;
IDReferencePropertyAttribute idRefAttr = null;
UrlPropertyAttribute urlAttr = null;
ElementReferenceAttribute elementAttr = null;
ComponentReferenceAttribute compAttr = null;
foreach(Attribute attr in prop.Attributes) {
Type attrType = attr.GetType();
if(attrType == typeof(ExtenderControlPropertyAttribute))
propAttr = attr as ExtenderControlPropertyAttribute;
else if(attrType == typeof(ExtenderControlEventAttribute))
eventAttr = attr as ExtenderControlEventAttribute;
else if(attrType == typeof(ClientPropertyNameAttribute))
nameAttr = attr as ClientPropertyNameAttribute;
else if(attrType == typeof(IDReferencePropertyAttribute))
idRefAttr = attr as IDReferencePropertyAttribute;
else if(attrType == typeof(UrlPropertyAttribute))
urlAttr = attr as UrlPropertyAttribute;
else if(attrType == typeof(ElementReferenceAttribute))
elementAttr = attr as ElementReferenceAttribute;
else if(attrType == typeof(ComponentReferenceAttribute))
compAttr = attr as ComponentReferenceAttribute;
}
string propertyName = prop.Name;
// Try getting a property attribute
if(propAttr == null || !propAttr.IsScriptProperty) {
// Try getting an event attribute
if(eventAttr == null || !eventAttr.IsScriptEvent) {
continue;
}
}
// attempt to rename the property/event
if(nameAttr != null && !string.IsNullOrEmpty(nameAttr.PropertyName)) {
propertyName = nameAttr.PropertyName;
}
// 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;
object value = prop.GetValue(instance);
if(value == null) {
continue;
}
// 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) {
// Use ASP.NET JSON serialization
} else {
// Use the property's own converter
TypeConverter conv = prop.Converter;
if(value.GetType() == typeof(DateTime))
value = ((DateTime)value).ToString("s", CultureInfo.InvariantCulture);
else
value = conv.ConvertToString(null, CultureInfo.InvariantCulture, value);
}
}
}
if(idRefAttr != null && controlResolver != null) {
c = controlResolver.ResolveControl((string)value);
}
if(urlAttr != 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(elementAttr != null) {
if(c == null && controlResolver != null)
c = controlResolver.ResolveControl((string)value);
if(c != null)
value = c.ClientID;
descriptor.AddElementProperty(propertyName, (string)value);
} else if(compAttr != 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 static void DescribeComponent(object instance, IScriptComponentDescriptor 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;
ClientPropertyNameAttribute nameAttr = null;
IDReferencePropertyAttribute idRefAttr = null;
UrlPropertyAttribute urlAttr = null;
ElementReferenceAttribute elementAttr = null;
ComponentReferenceAttribute compAttr = null;
foreach (Attribute attr in prop.Attributes)
{
Type attrType = attr.GetType();
if (attrType == typeof(ExtenderControlPropertyAttribute))
{
propAttr = attr as ExtenderControlPropertyAttribute;
}
else if (attrType == typeof(ExtenderControlEventAttribute))
{
eventAttr = attr as ExtenderControlEventAttribute;
}
else if (attrType == typeof(ClientPropertyNameAttribute))
{
nameAttr = attr as ClientPropertyNameAttribute;
}
else if (attrType == typeof(IDReferencePropertyAttribute))
{
idRefAttr = attr as IDReferencePropertyAttribute;
}
else if (attrType == typeof(UrlPropertyAttribute))
{
urlAttr = attr as UrlPropertyAttribute;
}
else if (attrType == typeof(ElementReferenceAttribute))
{
elementAttr = attr as ElementReferenceAttribute;
}
else if (attrType == typeof(ComponentReferenceAttribute))
{
compAttr = attr as ComponentReferenceAttribute;
}
}
string propertyName = prop.Name;
// Try getting a property attribute
if (propAttr == null || !propAttr.IsScriptProperty)
{
// Try getting an event attribute
if (eventAttr == null || !eventAttr.IsScriptEvent)
{
continue;
}
}
// attempt to rename the property/event
if (nameAttr != null && !string.IsNullOrEmpty(nameAttr.PropertyName))
{
propertyName = nameAttr.PropertyName;
}
// 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;
object value = prop.GetValue(instance);
if (value == null)
{
continue;
}
// 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)
{
// Use ASP.NET JSON serialization
}
else
{
// Use the property's own converter
TypeConverter conv = prop.Converter;
if (value.GetType() == typeof(DateTime))
{
value = ((DateTime)value).ToString("s", CultureInfo.InvariantCulture);
}
else
{
value = conv.ConvertToString(null, CultureInfo.InvariantCulture, value);
}
}
}
}
if (idRefAttr != null && controlResolver != null)
{
c = controlResolver.ResolveControl((string)value);
}
if (urlAttr != 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 (elementAttr != null)
{
if (c == null && controlResolver != null)
{
c = controlResolver.ResolveControl((string)value);
}
if (c != null)
{
value = c.ClientID;
}
descriptor.AddElementProperty(propertyName, (string)value);
}
else if (compAttr != 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;
}
}
