Does it work if you extract the lambda you're passing into Find() into a separate function? The error message makes it seem like it's complaining that you're passing it a List<EngineObject> instead of a Predicate<EngineObject>.
Seems to me like that should compile. Try using the LINQ extension First instead (just for kicks). Also, do you have some variable named i in scope? Neither should give you the error you are getting though... I can't think of anything that could make the lambda infer as a List..
/// <summary>
/// Returns an Object of the supplied type, given it's id
/// </summary>
public T GetObject<T>( int objectId )
{
if( m_objectInstances.ContainsKey(typeof(T)) )
{
List<EngineObject> objectList = m_objectInstances[typeof(T)];
var result = from obj in objectList where obj.ID == objectId select obj;
/*
for( int i = 0; i < objectList.Count; i++ )
{
if( objectList.ID == objectId )
{
return (T)((object)objectList);
}
}
*/
}
return default(T);
}
I looked up how to use LINQ, and the following does work :
public T GetObject<T>(int objectId) where T : EngineObject
{
Dictionary<int, EngineObject> objects;
if (m_objectInstances.TryGetValue(typeof(T), out objects))
return (T)objects[objectId];
else
return default(T);
}
private Dictionary<Type, Dictionary<int, EngineObject>> m_objectInstances;
[quote name='Capoeirista' timestamp='1347913255' post='4981007']
I looked up how to use LINQ, and the following does work :
public T GetObject<T>(int objectId) where T : EngineObject
{
Dictionary<int, EngineObject> objects;
if (m_objectInstances.TryGetValue(typeof(T), out objects))
return (T)objects[objectId];
else
return default(T);
}
private Dictionary<Type, Dictionary<int, EngineObject>> m_objectInstances;
objectList.Find( delegate(EngineObject obj) { return obj.ID == objectId; } );
This also does not work?
objectList.Find( i => i.ID == objectId );
That method will always return default(T).
But as an aside, if you're going to look up an object by its id, why not use a dictionary for the collection of EngineObjects as well?
