public override object InvokeMember (string name, BindingFlags invokeAttr,
Binder binder, object target, object[] args,
ParameterModifier[] modifiers,
CultureInfo culture, string[] namedParameters)
{
const string bindingflags_arg = "bindingFlags";
if ((invokeAttr & BindingFlags.CreateInstance) != 0) {
if ((invokeAttr & (BindingFlags.GetField |
BindingFlags.GetField | BindingFlags.GetProperty |
BindingFlags.SetProperty)) != 0)
throw new ArgumentException (bindingflags_arg);
} else if (name == null)
throw new ArgumentNullException ("name");
if ((invokeAttr & BindingFlags.GetField) != 0 && (invokeAttr & BindingFlags.SetField) != 0)
throw new ArgumentException ("Cannot specify both Get and Set on a field.", bindingflags_arg);
if ((invokeAttr & BindingFlags.GetProperty) != 0 && (invokeAttr & BindingFlags.SetProperty) != 0)
throw new ArgumentException ("Cannot specify both Get and Set on a property.", bindingflags_arg);
if ((invokeAttr & BindingFlags.InvokeMethod) != 0) {
if ((invokeAttr & BindingFlags.SetField) != 0)
throw new ArgumentException ("Cannot specify Set on a field and Invoke on a method.", bindingflags_arg);
if ((invokeAttr & BindingFlags.SetProperty) != 0)
throw new ArgumentException ("Cannot specify Set on a property and Invoke on a method.", bindingflags_arg);
}
if ((namedParameters != null) && ((args == null) || args.Length < namedParameters.Length))
throw new ArgumentException ("namedParameters cannot be more than named arguments in number");
if ((invokeAttr & (BindingFlags.InvokeMethod|BindingFlags.CreateInstance|BindingFlags.GetField|BindingFlags.SetField|BindingFlags.GetProperty|BindingFlags.SetProperty)) == 0)
throw new ArgumentException ("Must specify binding flags describing the invoke operation required.", bindingflags_arg);
/* set some defaults if none are provided :-( */
if ((invokeAttr & (BindingFlags.Public|BindingFlags.NonPublic)) == 0)
invokeAttr |= BindingFlags.Public;
if ((invokeAttr & (BindingFlags.Static|BindingFlags.Instance)) == 0)
invokeAttr |= BindingFlags.Static|BindingFlags.Instance;
if (binder == null)
binder = Binder.DefaultBinder;
if ((invokeAttr & BindingFlags.CreateInstance) != 0) {
/* the name is ignored */
invokeAttr |= BindingFlags.DeclaredOnly;
ConstructorInfo[] ctors = GetConstructors (invokeAttr);
object state = null;
MethodBase ctor = binder.BindToMethod (invokeAttr, ctors, ref args, modifiers, culture, namedParameters, out state);
if (ctor == null) {
if (this.IsValueType && args == null)
return Activator.CreateInstanceInternal (this);
throw new MissingMethodException ("Constructor on type '" + FullName + "' not found.");
}
object result = ctor.Invoke (target, invokeAttr, binder, args, culture);
binder.ReorderArgumentArray (ref args, state);
return result;
}
if (name == String.Empty && Attribute.IsDefined (this, typeof (DefaultMemberAttribute))) {
DefaultMemberAttribute attr = (DefaultMemberAttribute) Attribute.GetCustomAttribute (this, typeof (DefaultMemberAttribute));
name = attr.MemberName;
}
bool ignoreCase = (invokeAttr & BindingFlags.IgnoreCase) != 0;
string throwMissingMethodDescription = null;
bool throwMissingFieldException = false;
if ((invokeAttr & BindingFlags.InvokeMethod) != 0) {
MethodInfo[] methods = GetMethodsByName (name, invokeAttr, ignoreCase, this);
object state = null;
if (args == null)
args = EmptyArray<object>.Value;
MethodBase m = binder.BindToMethod (invokeAttr, methods, ref args, modifiers, culture, namedParameters, out state);
if (m == null) {
if (methods.Length > 0)
throwMissingMethodDescription = "The best match for method " + name + " has some invalid parameter.";
else
throwMissingMethodDescription = "Cannot find method " + name + ".";
} else {
ParameterInfo[] parameters = m.GetParameters();
for (int i = 0; i < parameters.Length; ++i) {
if (System.Reflection.Missing.Value == args [i] && (parameters [i].Attributes & ParameterAttributes.HasDefault) != ParameterAttributes.HasDefault)
throw new ArgumentException ("Used Missing.Value for argument without default value", "parameters");
}
object result = m.Invoke (target, invokeAttr, binder, args, culture);
binder.ReorderArgumentArray (ref args, state);
return result;
}
}
if ((invokeAttr & BindingFlags.GetField) != 0) {
FieldInfo f = GetField (name, invokeAttr);
if (f != null) {
return f.GetValue (target);
} else if ((invokeAttr & BindingFlags.GetProperty) == 0) {
throwMissingFieldException = true;
}
/* try GetProperty */
} else if ((invokeAttr & BindingFlags.SetField) != 0) {
FieldInfo f = GetField (name, invokeAttr);
if (f != null) {
if (args == null)
throw new ArgumentNullException ("providedArgs");
if ((args == null) || args.Length != 1)
throw new ArgumentException ("Only the field value can be specified to set a field value.", bindingflags_arg);
f.SetValue (target, args [0]);
return null;
} else if ((invokeAttr & BindingFlags.SetProperty) == 0) {
throwMissingFieldException = true;
}
/* try SetProperty */
}
if ((invokeAttr & BindingFlags.GetProperty) != 0) {
PropertyInfo[] properties = GetPropertiesByName (name, invokeAttr, ignoreCase, this);
object state = null;
int i, count = 0;
for (i = 0; i < properties.Length; ++i) {
if ((properties [i].GetGetMethod (true) != null))
count++;
}
MethodBase[] smethods = new MethodBase [count];
count = 0;
for (i = 0; i < properties.Length; ++i) {
MethodBase mb = properties [i].GetGetMethod (true);
if (mb != null)
smethods [count++] = mb;
}
MethodBase m = binder.BindToMethod (invokeAttr, smethods, ref args, modifiers, culture, namedParameters, out state);
if (m == null) {
throwMissingFieldException = true;
} else {
object result = m.Invoke (target, invokeAttr, binder, args, culture);
binder.ReorderArgumentArray (ref args, state);
return result;
}
} else if ((invokeAttr & BindingFlags.SetProperty) != 0) {
PropertyInfo[] properties = GetPropertiesByName (name, invokeAttr, ignoreCase, this);
object state = null;
int i, count = 0;
for (i = 0; i < properties.Length; ++i) {
if (properties [i].GetSetMethod (true) != null)
count++;
}
MethodBase[] smethods = new MethodBase [count];
count = 0;
for (i = 0; i < properties.Length; ++i) {
MethodBase mb = properties [i].GetSetMethod (true);
if (mb != null)
smethods [count++] = mb;
}
MethodBase m = binder.BindToMethod (invokeAttr, smethods, ref args, modifiers, culture, namedParameters, out state);
if (m == null) {
throwMissingFieldException = true;
} else {
object result = m.Invoke (target, invokeAttr, binder, args, culture);
binder.ReorderArgumentArray (ref args, state);
return result;
}
}
if (throwMissingMethodDescription != null)
throw new MissingMethodException(throwMissingMethodDescription);
if (throwMissingFieldException)
throw new MissingFieldException("Cannot find variable " + name + ".");
return null;
}
