public DynamicTypeBuilder ConfigureConstructor()
{
var constructors = InstanceType.GetTypeInfo().GetConstructors();
if (constructors.Length > 1)
{
Array.Sort(constructors, (ctor1, ctor2) => ctor2.GetParameters().Length - ctor1.GetParameters().Length);
VerifyConstructorParameters();
}
var ctor = constructors[0];
var parameterInfos = ctor.GetParameters();
var originalParameterCount = parameterInfos.Length;
var parameterTypes = new Type[originalParameterCount + 1];
Array.Copy(parameterInfos.Select(p => p.ParameterType).ToArray(), parameterTypes, originalParameterCount);
parameterTypes[originalParameterCount] = typeof(IServiceProvider);
var constructorBuilder =
_typeBuilder.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard, parameterTypes);
var il = constructorBuilder.GetILGenerator();
il.Emit(OpCodes.Nop);
il.Emit(OpCodes.Ldarg_0);
for (var i = 1; i <= originalParameterCount; i++)
{
il.Emit(OpCodes.Ldarg, i);
}
il.Emit(OpCodes.Newobj, ctor);
il.Emit(OpCodes.Stfld, InstanceFieldFeature.FieldBuilder);
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Ldarg, originalParameterCount + 1);
il.Emit(OpCodes.Stfld, ServicesFeature.FieldBuilder);
il.Emit(OpCodes.Ret);
InstanceConstructorFeatures = new ConstructorFeature()
{
ConstructorBuilder = constructorBuilder,
ConstructorInfo = ctor
};
return(this);
void VerifyConstructorParameters()
{
var firstCtor = constructors[0];
var parameterTypeSet = firstCtor.GetParameters().Select(p => p.ParameterType).ToImmutableHashSet();
for (int i = 1; i < constructors.Length; i++)
{
if (!parameterTypeSet.IsSupersetOf(constructors[i].GetParameters().Select(p => p.ParameterType)))
{
throw new InvalidOperationException("当构造函数不唯一时，必须有一个构造函数的参数是其他构造函数参数的超集");
}
}
}
}
public GeneralSubscribable(object instance)
{
Instance = instance;
InstanceType = instance.GetType();
InstanceTypeInfo = InstanceType.GetTypeInfo();
NotifyPropertyChanged = instance as INotifyPropertyChanged;
HookIntoChangeHandlers();
}
public async Task <bool> AttachEvent(string eventName, EventHandler <HtmlEventArgs> handler)
{
if (string.IsNullOrEmpty(eventName))
{
throw new ArgumentNullException("eventName");
}
if (handler == null)
{
throw new ArgumentNullException("handler");
}
var scriptAlias = eventName;
var ei = InstanceType.GetTypeInfo().GetEvent(eventName, BindingFlags.Instance | BindingFlags.Public);
if (ei != null)
{
if (ei.IsDefined(typeof(ScriptableMemberAttribute), false))
{
var att = ei.GetCustomAttribute <ScriptableMemberAttribute>(false);
scriptAlias = (att.ScriptAlias ?? scriptAlias);
}
}
WebSharpHtmlEvent websharpEvent;
var result = false;
if (!EventHandlers.TryGetValue(scriptAlias, out websharpEvent))
{
websharpEvent = new WebSharpHtmlEvent(this, scriptAlias);
if (ScriptObjectProxy != null)
{
var eventCallback = new
{
handle = Handle,
onEvent = scriptAlias,
uid = websharpEvent.UID,
callback = websharpEvent.EventCallbackFunction,
handlerType = "HtmlEventArgs"
};
result = await WebSharp.Bridge.AddEventListener(eventCallback);
}
EventHandlers[scriptAlias] = websharpEvent;
}
websharpEvent.AddEventHandler(handler);
return(result);
}