调用 API 时出现以下异常：
InvalidOperationException - The current type, System.Collections.Generic.IReadOnlyDictionary`2[System.Type,Microsoft.EntityFrameworkCore.Infrastructure.IDbContextOptionsExtension], is an interface and cannot be constructed. Are you missing a type mapping?
这是完整的错误：
{
"Message": "An error has occurred.",
"ExceptionMessage": "An error occurred when trying to create a controller of type 'TechnicianController'. Make sure that the controller has a parameterless public constructor.",
"ExceptionType": "System.InvalidOperationException",
"StackTrace": " at System.Web.Http.Dispatcher.DefaultHttpControllerActivator.Create(HttpRequestMessage request, HttpControllerDescriptor controllerDescriptor, Type controllerType)\r\n at System.Web.Http.Controllers.HttpControllerDescriptor.CreateController(HttpRequestMessage request)\r\n at System.Web.Http.Dispatcher.HttpControllerDispatcher.<SendAsync>d__1.MoveNext()",
"InnerException": {
"Message": "An error has occurred.",
"ExceptionMessage": "Resolution of the dependency …