Can't we have extension methods with same name for different classes?

I have two extension methods like this..

One is 

   public static BsonValue TopOne(this IEnumerable<BsonValue> IEnumBv)
   {

   }

Second One is 

 public static BsonValue TopOne(this BsonValue IEnumBv)
 {

 }

Is this not possible ? I am not getting reason.

Even name are same but its for different Extensions methods right ?

Or how to achieve this ? I need topone name for both the extensions.Is it possible ?

UPDATE

I am getting this error

The call is ambiguous between the following methods or properties: 'BsonExtensionLibrary.MongoExtensions.TopOne(MongoDB.Bson.BsonValue)' and 'BsonExtensionLibrary.MongoExtensions.TopOne(System.Collections.Generic.IEnumerable)

Jon Skeet
people
quotationmark

You can absolutely do this - but you'll have problems if you try to call the extension method on something which is both a BsonValue and an IEnumerable<BsonValue>. For example:

BsonArray array = ...;
BsonValue top = array.TopValue();

Which method would you expect to be called? Both are applicable, and neither conversion is better than the other.

Note that this has nothing to do with extension methods really - it's just overload resolution. You'd face exactly the same problem if those were normal static methods, and you had:

BsonArray array = ...;
BsonValue top = BsonHelpers.TopValue(array);

Either give the two methods different names, or find some way of expressing what you want, e.g.

BsonArray array = ...;
BsonValue topAsEnumerable = array.AsEnumerable().TopValue();
BsonValue topAsValue = ((BsonValue) array).TopValue();

(That's using the Enumerable.AsEnumerable extension method just to convert the expression type to IEnumerable<BsonValue>.)

people

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