cannot be inferred from the usage. Try specifying the type arguments explicitly from iinterface

user20051042 0
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beloww is my interface

public interface IMyInterface
  {
   public Task<IApiResponseItem<T>> MyMethodt<T>(string inp1, string inp2,
  string inp3="SqlKey", ApiMethod method = ApiMethod.Get,
  TimeSpan? timeout = null) where T : new();
  }

and implementation

 public async Task<IApiResponseItem<T>> MyMethodt<T>(string inp1, string inp2,
  string inp3="SqlKey", ApiMethod method = ApiMethod.Get,
  TimeSpan? timeout = null) where T : new();
  {
  
  }

below is the call

var iApiResponse = await _resilentApi.MyMethodt(inp1, inp2, "SqlKey", ApiMethod.Get, timeout);

but, i always receiving error as

The type arguments for method 'IMyInterface.MyMethodt(string, string, string, ApiMethod, TimeSpan?)' cannot be inferred from the usage. Try specifying the type arguments explicitly.

c# api
1 Answers

You pass in a string, a string, a string, an enum and a TimeSpan to the method. You never specified T in the parameters of the method. How would the compiler be able to figure out what T is? It could be anything.

There are 2 possible solutions.

  1. you need to specify the type as part of the method call.

    var iApiResponse = await _resilentApi.MyMethodt<Whatever>(inp1, inp2, "SqlKey", ApiMethod.Get, timeout); 
                                                ^^^^^^^^

  2. make T part of the method signature somewhere

    public async Task<IApiResponseItem<T>> MyMethodt<T>(string inp1, string inp2, T t,
     string inp3 = "SqlKey", ApiMethod method = ApiMethod.Get,                ^^^
     TimeSpan? timeout = null) where T : new()
Thomas Weller0
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