Overloaded Method Resolution and Null Arguments
The process of selecting the correct overloaded method when a null argument is provided follows a specific sequence of steps.
1. Accessibility:
Initially, the compiler filters out any inaccessible overloaded methods based on the calling code's access rights.
2. Applicability:
Next, it identifies applicable methods. A method is considered applicable if each formal parameter has a corresponding argument that can be implicitly converted. Null values cannot be implicitly converted to value types (like int
or Point
), eliminating those methods from consideration.
3. params
Method Handling:
Methods using the params
keyword can be invoked either expanded (treating the array as individual arguments) or unexpanded (treating it as a single array argument). If both are applicable, the expanded form is preferred, and the unexpanded version is discarded.
4. Best Match Selection:
Finally, the compiler compares the remaining applicable methods to find the most specific match. A method with a more specialized parameter type is considered more specific than one with a more general type.
In scenarios with ambiguity (multiple equally specific methods), as in the example provided, the compiler cannot determine the best candidate, resulting in a compilation error. The object
parameter type is less specific than both object[]
and string
, leading to this ambiguity.
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