我想在c＃中做一个通用的方法，我想返回一个记录列表

Question

class Employee 
{ 
    int Id { get; set; } 
    string Name { get; set; } 
} 

class ServiceIEmployeeModel 
{ 
    int Id { get; set; } 
    string Name { get; set; } 
} 

以上员工和ServiceIEmployeeModel类应该自动映射其视图表示。

//My Generic Method below 
public List<U> ListMapping<T, U>(List<T> sourceClass) 
{   
      var config = new MapperConfiguration(cfg => { cfg.CreateMap<T, U>(); }); 
      IMapper mapper = config.CreateMapper(); 
      List<U> finalData = mapper.Map<List<T>, List<U>>(sourceClass); 
      return finalData; 
} 

List<Employee> employeeData = new List<Employee>(); 
List<ServiceIEmployeeModel> obj = new List<ServiceIEmployeeModel>(); 

    ServiceIEmployeeModel obj = new ServiceIEmployeeModel(); 
    obj.Id = 2; 
    obj.Name = "xyz";  

employeeData = 
ListMapping<List<ServiceIEmployeeModel>, List<Employee>>(sourceClass:obj); 

我想在c＃中做一个通用的方法，我想返回记录列表。

我有以下代码来调用泛型方法：

But i get an error saying :- 
Error CS1503 Argument 1: cannot convert from 'System.Collections.Generic.List<ServiceIEmployeeModel>' 
to 'System.Collections.Generic.List<System.Collections.Generic.List<ServiceIEmployeeModel>>' 
Msc.MasterData.Presentation.Web C:\Users\sabarimani.a\Desktop\Presentation.Web\Web\Controllers\EmployeeController.cs 59 
    Active 

Answer 1

你ListMapping方法接受类型参数，并试图映射该类型的名单。注意这一行：

List<U> finalData = mapper.Map<List<T>, List<U>>(sourceClass); 

当你通过List<ServiceIEmployeeModel>和List<Employee>类型parametets这种方法的话，T将List<ServiceIEmployeeModel>和U将List<Employee>类型和List<U> finalData = mapper.Map<List<T>, List<U>>(sourceClass);行会居然喜欢：

List<List<Employee>> finalData = mapper 
    .Map<List<List<ServiceIEmployeeModel>>, List<List<Employee>>>(sourceClass); 

而这不是你想达到的。相反，请调用此方法，如：

List<ServiceIEmployeeModel> initialData = .....; 
employeeData = 
    ListMapping<ServiceIEmployeeModel, Employee>(initialData);