Why Does C# Generic Type Inference Fail with Sufficient Information?

C# Generic Type Inference

Question:

In scenarios involving generic methods, C# type inference cannot determine the correct generic parameters even when there is sufficient information.

Question:

Why does the compiler have difficulty inferring generic parameters in this specific case?

Answer:

Type inference in C# is based solely on the parameters passed to generic methods and the types of the corresponding formal parameters. Constraints defined for generic types are not considered during inference.

In this case, the compiler cannot infer the type parameters because the code passes an instance of IQuery (i.e. SomeQuery) as a parameter to Process, but Process itself is defined as Process, without specifying constraints.

To solve this problem, the generic parameters must be explicitly specified when calling Process, as shown below:

<code class="language-csharp">p.Process<SomeQuery, string>(query);</code>

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