C# 如何通过接口调用视图模型中的服务 我已经定义了一个服务RestService.cs，并尝试调用 来自视图模型的服务FirstViewModel.cs 如何使用IntIRestService.cs

RestService.cs

namespace SqliteDemo.core.Services
{
    public class RestService : IntIRestService
    {
        public async Task<List<People>> GetSalesPeopleAsync()
        {
            try
            {   
                //Declare a Http client
                var client = new HttpClient();
                //Add a Base URl
                client.BaseAddress = new Uri(Constants.MUrl);
                //Add the response type
                client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
                //Add the API
                var response = await client.GetAsync("iCodersLab/Custom-ListView-Using-Volley/master/richman.json");

                var content = await response.Content.ReadAsStringAsync();
                //return content;
            }
            catch (Exception ex)
            {
                var t = ex.Message;
            }

            return null;
        }
    }
}

namespace SqliteDemo.core.ViewModels
{
    public class FirstViewModel 
        : MvxViewModel
    {
        public event EventHandler mNetworkClick;

        public ICommand networkTask
        {
            get;
            set;
        }


        public FirstViewModel()
        {
            networkTask = new MvxCommand<string>(param =>
            {
                //Calling Service here
            });
        }

    }
}

namespace SqliteDemo.core.Services.ServiceInterfeces
{
    public interface IntIRestService
    {
        Task<List<People>> GetSalesPeopleAsync();
    }
}

名称空间SqliteDemo.core.Services
{
公共类RestService:IntIRestService
{
公共异步任务GetSalesoperEasync（）
{
尝试
{   
//声明一个Http客户端
var client=新的HttpClient（）；
//添加一个基本URl
client.BaseAddress=新Uri（Constants.MUrl）；
//添加响应类型
client.DefaultRequestHeaders.Accept.Add（新的MediaTypeWithQualityHeaderValue（“应用程序/json”）；
//添加API
var response=await client.GetAsync（“使用Volley/master/richman.json的iCodersLab/Custom ListView”）；
var content=await response.content.ReadAsStringAsync（）；
//返回内容；
}
捕获（例外情况除外）
{
var t=ex.消息；
}
返回null；
}
}
}

FirstViewModel.cs

namespace SqliteDemo.core.Services
{
    public class RestService : IntIRestService
    {
        public async Task<List<People>> GetSalesPeopleAsync()
        {
            try
            {   
                //Declare a Http client
                var client = new HttpClient();
                //Add a Base URl
                client.BaseAddress = new Uri(Constants.MUrl);
                //Add the response type
                client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
                //Add the API
                var response = await client.GetAsync("iCodersLab/Custom-ListView-Using-Volley/master/richman.json");

                var content = await response.Content.ReadAsStringAsync();
                //return content;
            }
            catch (Exception ex)
            {
                var t = ex.Message;
            }

            return null;
        }
    }
}

namespace SqliteDemo.core.ViewModels
{
    public class FirstViewModel 
        : MvxViewModel
    {
        public event EventHandler mNetworkClick;

        public ICommand networkTask
        {
            get;
            set;
        }


        public FirstViewModel()
        {
            networkTask = new MvxCommand<string>(param =>
            {
                //Calling Service here
            });
        }

    }
}

namespace SqliteDemo.core.Services.ServiceInterfeces
{
    public interface IntIRestService
    {
        Task<List<People>> GetSalesPeopleAsync();
    }
}

名称空间SqliteDemo.core.ViewModels
{
公共类第一视图模型
：MvxViewModel
{
公共事件事件处理程序mNetworkClick；
公共ICommand网络任务
{
得到；
设置
}
公共FirstViewModel（）
{
networkTask=新的MvxCommand（参数=>
{
//这里的呼叫服务
});
}
}
}

IntIRestService.cs

namespace SqliteDemo.core.Services
{
    public class RestService : IntIRestService
    {
        public async Task<List<People>> GetSalesPeopleAsync()
        {
            try
            {   
                //Declare a Http client
                var client = new HttpClient();
                //Add a Base URl
                client.BaseAddress = new Uri(Constants.MUrl);
                //Add the response type
                client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
                //Add the API
                var response = await client.GetAsync("iCodersLab/Custom-ListView-Using-Volley/master/richman.json");

                var content = await response.Content.ReadAsStringAsync();
                //return content;
            }
            catch (Exception ex)
            {
                var t = ex.Message;
            }

            return null;
        }
    }
}

namespace SqliteDemo.core.ViewModels
{
    public class FirstViewModel 
        : MvxViewModel
    {
        public event EventHandler mNetworkClick;

        public ICommand networkTask
        {
            get;
            set;
        }


        public FirstViewModel()
        {
            networkTask = new MvxCommand<string>(param =>
            {
                //Calling Service here
            });
        }

    }
}

namespace SqliteDemo.core.Services.ServiceInterfeces
{
    public interface IntIRestService
    {
        Task<List<People>> GetSalesPeopleAsync();
    }
}

名称空间SqliteDemo.core.Services.serviceinfereces
{
公共接口服务
{
任务GetSalesoperEasync（）；
}
}

IntIrestService是接口，您不能实例化接口。
您需要实例化实现接口的具体类

IntIrestService intIrestService = new RestService();

---

谢谢，

intIrestService.GetSalesPeopleAsync（）我可以用来调用服务，如何在异步任务完成后将控件返回到视图模型（在android中，我们使用侦听器，这里如何执行相同的操作）