public bool TryGetSetItem(out DispCallable value)
{
if (_setter != null)
{
value = _setter;
return(true);
}
return(SlowTryGetSetItem(out value));
}
public bool SlowTryGetSetItem(out DispCallable value)
{
EnsureScanDefinedMethods();
ComMethodDesc methodDesc = _comTypeDesc.SetItem;
// The following attempts to get a method corresponding to "[PROPERTYPUT, DISPID(0)] HRESULT Item(...)".
// However, without type information, we really don't know whether or not we have a property setter.
// All we can do is verify that the found dispId is DISPID_VALUE. So, if we find a dispId of DISPID_VALUE,
// we happily package it up as a property setter; otherwise, it's a no go...
if (methodDesc == null)
{
int dispId;
string name = "Item";
int hresult = GetIDsOfNames(_dispatchObject, name, out dispId);
if (hresult == ComHresults.DISP_E_UNKNOWNNAME)
{
value = null;
return(false);
}
else if (hresult != ComHresults.S_OK)
{
throw Error.CouldNotGetDispId(name, string.Format(CultureInfo.InvariantCulture, "0x{1:X})", hresult));
}
else if (dispId != ComDispIds.DISPID_VALUE)
{
value = null;
return(false);
}
methodDesc = new ComMethodDesc(name, dispId, ComTypes.INVOKEKIND.INVOKE_PROPERTYPUT);
_comTypeDesc.SetItem = methodDesc;
}
Interlocked.CompareExchange(
ref _setter,
new DispCallable(_dispatchObject, methodDesc),
null);
value = _setter;
return(true);
}
public bool SlowTryGetSetItem(out DispCallable value) {
EnsureScanDefinedMethods();
ComMethodDesc methodDesc = _comTypeDesc.SetItem;
// The following attempts to get a method corresponding to "[PROPERTYPUT, DISPID(0)] HRESULT Item(...)".
// However, without type information, we really don't know whether or not we have a property setter.
// All we can do is verify that the found dispId is DISPID_VALUE. So, if we find a dispId of DISPID_VALUE,
// we happily package it up as a property setter; otherwise, it's a no go...
if (methodDesc == null) {
int dispId;
string name = "Item";
int hresult = GetIDsOfNames(_dispatchObject, name, out dispId);
if (hresult == ComHresults.DISP_E_UNKNOWNNAME) {
value = null;
return false;
} else if (hresult != ComHresults.S_OK) {
throw Error.CouldNotGetDispId(name, string.Format(CultureInfo.InvariantCulture, "0x{1:X})", hresult));
} else if (dispId != ComDispIds.DISPID_VALUE) {
value = null;
return false;
}
methodDesc = new ComMethodDesc(name, dispId, ComTypes.INVOKEKIND.INVOKE_PROPERTYPUT);
_comTypeDesc.SetItem = methodDesc;
}
Interlocked.CompareExchange(
ref _setter,
new DispCallable(_dispatchObject, methodDesc),
null);
value = _setter;
return true;
}
public bool TryGetSetItem(out DispCallable value) {
if (_setter != null) {
value = _setter;
return true;
}
return SlowTryGetSetItem(out value);
}
internal DispCallableMetaObject(Expression expression, DispCallable callable)
: base(expression, Restrictions.Empty, callable) {
_callable = callable;
}
internal DispCallableMetaObject(Expression expression, DispCallable callable)
: base(expression, Restrictions.Empty, callable)
{
_callable = callable;
}
