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);
PropertyInfo[] properties = instance.GetType().GetProperties(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic);
foreach (PropertyInfo prop in properties)
{
ScriptControlPropertyAttribute propAttr = null;
ScriptControlEventAttribute eventAttr = null;
string propertyName = prop.Name;
System.ComponentModel.AttributeCollection attribs = new System.ComponentModel.AttributeCollection(Attribute.GetCustomAttributes(prop, false));
// Try getting a property attribute
propAttr = (ScriptControlPropertyAttribute)attribs[typeof(ScriptControlPropertyAttribute)];
if (propAttr == null || !propAttr.IsScriptProperty)
{
// Try getting an event attribute
eventAttr = (ScriptControlEventAttribute)attribs[typeof(ScriptControlEventAttribute)];
if (eventAttr == null || !eventAttr.IsScriptEvent)
{
continue;
}
}
// attempt to rename the property/event
ClientPropertyNameAttribute nameAttr = (ClientPropertyNameAttribute)attribs[typeof(ClientPropertyNameAttribute)];
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 = true;// 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, new object[0] {
});
if (value == null)
{
continue;
}
// convert and resolve the value
if (eventAttr != null && prop.PropertyType != typeof(String))
{
throw new InvalidOperationException("ScriptControlEventAttribute can only be applied to a property with a PropertyType of System.String.");
}
else
{
if (!prop.PropertyType.IsPrimitive && !prop.PropertyType.IsEnum)
{
if (prop.PropertyType == typeof(Color))
{
value = ColorTranslator.ToHtml((Color)value);
}
else
{
// TODO: Determine if we should let ASP.NET AJAX handle this type of conversion, as it supports JSON serialization
//TypeConverter conv = prop.Converter;
//value = conv.ConvertToString(null, CultureInfo.InvariantCulture, value);
//if (prop.PropertyType == typeof(CssStyleCollection))
// value = (new CssStyleCollectionJSCoverter()).Serialize(value, new JavaScriptSerializer());
//if (prop.PropertyType == typeof(Style))
// value = (new CssStyleCollectionJSCoverter()).Serialize(((Style)value).GetStyleAttributes(null), new JavaScriptSerializer());
Type valueType = value.GetType();
JavaScriptConverterAttribute attr = (JavaScriptConverterAttribute)attribs[typeof(JavaScriptConverterAttribute)];
JavaScriptConverter converter = attr != null ?
(JavaScriptConverter)TypeCreator.CreateInstance(attr.ConverterType) :
JsonSerializerFactory.GetJavaScriptConverter(valueType);
if (converter != null)
{
value = converter.Serialize(value, JsonSerializerFactory.GetJavaScriptSerializer());
}
else
{
value = JsonHelper.PreSerializeObject(value);
}
//Dictionary<string, object> dict = value as Dictionary<string, object>;
//if (dict != null && !dict.ContainsKey("__type"))
// dict["__type"] = valueType.AssemblyQualifiedName;
}
}
if (attribs[typeof(IDReferencePropertyAttribute)] != null && controlResolver != null)
{
c = controlResolver.ResolveControl((string)value);
}
if (attribs[typeof(UrlPropertyAttribute)] != null && urlResolver != null)
{
value = urlResolver.ResolveClientUrl((string)value);
}
}
// add the value as an appropriate description
if (eventAttr != null)
{
if (!string.IsNullOrEmpty((string)value))
{
descriptor.AddEvent(propertyName, (string)value);
}
}
else if (attribs[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 (attribs[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))
{
ScriptControlMethodAttribute methAttr = (ScriptControlMethodAttribute)Attribute.GetCustomAttribute(method, typeof(ScriptControlMethodAttribute));
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 string ExecuteCallbackMethod(Control control, string callbackArgument)
{
Type controlType = control.GetType();
// Deserialize the callback JSON into CLR objects
//JavaScriptSerializer js = JSONSerializerFactory.GetJavaScriptSerializer();
Dictionary <string, object> callInfo = JsonHelper.DeserializeObject(callbackArgument, typeof(Dictionary <string, object>)) 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;
Dictionary <string, object> 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 ScriptControlMethodAttribute
ParameterInfo[] methodParams = mi.GetParameters();
ScriptControlMethodAttribute methAttr = (ScriptControlMethodAttribute)Attribute.GetCustomAttribute(mi, typeof(ScriptControlMethodAttribute));
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 Microsoft.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] = js.Deserialize<object>(args[i].ToString());
//if (args[i].GetType() == methodParams[i].ParameterType || methodParams[i].ParameterType.GetInterface(typeof(IConvertible).AssemblyQualifiedName) != null)
// targetArgs[i] = Convert.ChangeType(args[i], methodParams[i].ParameterType, CultureInfo.InvariantCulture);
//else
//{
// JavaScriptSerializer ser = JSONSerializerFactory.GetJavaScriptSerializer(methodParams[i].ParameterType);
// string str = args[i] is string ? (string)args[i] : ser.Serialize(args[i]);
// targetArgs[i] = ser.DeserializeObject(str);
//}
targetArgs[i] = JsonHelper.DeserializeObject(args[i], methodParams[i].ParameterType);
}
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 = new Dictionary <string, object>();
error["name"] = ex.GetType().FullName;
error["message"] = ex.Message;
error["stackTrace"] = ex.StackTrace;
TryWriteLog(ex, control);
}
// 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(JsonHelper.Serialize(resultInfo));
}