public static string ExecuteCallbackMethod(Control control, string callbackArgument)
{
Type controlType = control.GetType();
// Deserialize the callback JSON into CLR objects
JavaScriptSerializer js = new JavaScriptSerializer();
Dictionary <string, object> callInfo = js.DeserializeObject(callbackArgument) as Dictionary <string, object>;
// Get the call information
string methodName = (string)callInfo["name"];
object[] args = (object[])callInfo["args"];
string clientState = (string)callInfo["state"];
// Attempt to load the client state
IClientStateManager csm = control as IClientStateManager;
if (csm != null && csm.SupportsClientState)
{
csm.LoadClientState(clientState);
}
// call the method
object result = null;
string error = null;
try
{
// Find a matching static or instance method. Only public methods can be invoked
MethodInfo mi = controlType.GetMethod(methodName,
BindingFlags.Public | BindingFlags.Static | BindingFlags.Instance);
if (mi == null)
{
throw new MissingMethodException(controlType.FullName, methodName);
}
// Verify that the method has the corrent number of parameters as well as the ExtenderControlMethodAttribute
ParameterInfo[] methodParams = mi.GetParameters();
ExtenderControlMethodAttribute methAttr =
(ExtenderControlMethodAttribute)
Attribute.GetCustomAttribute(mi, typeof(ExtenderControlMethodAttribute));
if (methAttr == null || !methAttr.IsScriptMethod || args.Length != methodParams.Length)
{
throw new MissingMethodException(controlType.FullName, methodName);
}
// Convert each argument to the parameter type if possible
// NOTE: I'd rather have the ObjectConverter from within System.Web.Script.Serialization namespace for this
object[] targetArgs = new object[args.Length];
for (int i = 0; i < targetArgs.Length; i++)
{
if (args[i] == null)
{
continue;
}
targetArgs[i] = Convert.ChangeType(args[i], methodParams[i].ParameterType,
CultureInfo.InvariantCulture);
}
result = mi.Invoke(control, targetArgs);
}
catch (Exception ex)
{
// Catch the exception information to relay back to the client
if (ex is TargetInvocationException)
{
ex = ex.InnerException;
}
error = ex.GetType().FullName + ":" + ex.Message;
}
// return the result
Dictionary <string, object> resultInfo = new Dictionary <string, object>();
if (error == null)
{
resultInfo["result"] = result;
if (csm != null && csm.SupportsClientState)
{
resultInfo["state"] = csm.SaveClientState();
}
}
else
{
resultInfo["error"] = error;
}
// Serialize the result info into JSON
return(js.Serialize(resultInfo));
}
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;
}
}
private static Dictionary <string, object> BuildGraph(object obj, IUrlResolutionService uriResolver,
IControlResolver controlResolver)
{
Dictionary <string, object> dict = new Dictionary <string, object>();
PropertyDescriptorCollection pdc = TypeDescriptor.GetProperties(obj);
foreach (PropertyDescriptor pd in pdc)
{
ExtenderControlPropertyAttribute ecpa = GetAttribute <ExtenderControlPropertyAttribute>(pd);
ClientPropertyNameAttribute cpna = GetAttribute <ClientPropertyNameAttribute>(pd);
IDReferencePropertyAttribute idr = GetAttribute <IDReferencePropertyAttribute>(pd);
UrlPropertyAttribute ura = GetAttribute <UrlPropertyAttribute>(pd);
ExtenderControlMethodAttribute ecma = GetAttribute <ExtenderControlMethodAttribute>(pd);
ExtenderControlEventAttribute ecea = GetAttribute <ExtenderControlEventAttribute>(pd);
ElementReferenceAttribute era = GetAttribute <ElementReferenceAttribute>(pd);
ComponentReferenceAttribute cra = GetAttribute <ComponentReferenceAttribute>(pd);
if (ecpa == null && cra == null && cpna == null && era == null)
{
continue;
}
string propName =
cpna != null && !string.IsNullOrEmpty(cpna.PropertyName)
? cpna.PropertyName
: pd.Name;
if (propName == "ClientClassName")
{
propName = "typeToBuild";
}
object o = null;
object value = pd.GetValue(obj);
if (value == null)
{
continue;
}
if (value as IClientClass != null && ((IClientClass)value).NotSet)
{
continue;
}
if (value as ClientEvalScript != null && string.IsNullOrEmpty((value as ClientEvalScript).ClientScript))
{
continue;
}
if (pd.PropertyType == typeof(string))
{
o = value;
if (ura != null)
{
o = uriResolver.ResolveClientUrl((string)o);
}
else if (idr != null || cra != null)
{
o = BuildGraph(new Reference
{
ReferenceType = ReferenceType.Component,
ClientId = controlResolver.ResolveControl((string)o).ClientID
}, uriResolver, controlResolver);
}
else if (era != null)
{
Control c = controlResolver.ResolveControl((string)o);
o = BuildGraph(
new Reference
{
ReferenceType = ReferenceType.Element, ClientId = c == null ? (string)o : c.ClientID
},
uriResolver, controlResolver);
}
}
else if (value is IEnumerable)
{
List <object> lst = new List <object>();
foreach (object a in (IEnumerable)value)
{
object b;
if (a as IUICollectionItem != null)
{
b = a is UriValue
? uriResolver.ResolveClientUrl(((UriValue)a).Value.ToString())
: ((IUICollectionItem)a).Value;
}
else
{
b = BuildGraph(a, uriResolver, controlResolver);
}
if (b != null)
{
lst.Add(b);
}
}
if (lst.Count > 0)
{
o = lst;
}
}
else if (pd.PropertyType.IsEnum)
{
o = Enum.GetName(pd.PropertyType, value);
}
else if (pd.PropertyType.IsPrimitive || pd.PropertyType.IsValueType)
{
o = value;
}
else
{
o = BuildGraph(value, uriResolver, controlResolver);
}
if (o != null)
{
dict.Add(propName, o);
}
}
return(dict.Count > 0 ? dict : null);
}
