Linq相当于

Question

foreach (ParameterGroup paramGroup in ParamGroups) 
     { 
      foreach (Parameter parameter in paramGroup.ParameterList) 
      { 
       if (parameter.ParameterId == parameterId) 
        return paramGroup.GroupId; 
      } 
     } 

什么是LINQ eqiavalent？

Answer 1

return (from paramGroup in ParamGroups 
     from parameter in paramGroup.ParameterList 
     where parameter.ParameterId == parameterId 
     select paramGroup.GroupId).FirstOrDefault();