Question

我正在尝试将身份登录实施到我的跨平台应用中。我在我的应用程序中创建了Azure SQL数据库并配置了API服务。一切正常，我可以注册/登录用户。但是，我想检查用户是否登录并显示对话框（您已成功注册/登录，或密码不匹配/错误等）。如果成功，我想将用户导航到应用程序的主页。你能告诉我如何实现这个目标吗？感谢您的支持。

到目前为止已完成的工作：

apiservices.cs

public class ApiServices {
    public async Task RegisterUserAsync(string email, string password, string confirmPassword) {
        var client = new HttpClient();
        var success = false;
        var model = new RegisterBindingModel {
            Email = email, Password = password, ConfirmPassword = confirmPassword
        };
        try {
            var json = JsonConvert.SerializeObject(model);
            HttpContent content = new StringContent(json);
            content.Headers.ContentType = new MediaTypeHeaderValue("application/json");
            if (email != null || password != null) {
                success = true;
                Acr.UserDialogs.UserDialogs.Instance.ShowSuccess(string.Format("You are now signed-in as {0}.", email));
                var response = await client.PostAsync(Constants.BaseApiAddress + "api/Account/Register", content);
                Debug.WriteLine(response);
                Debug.WriteLine(await response.Content.ReadAsStringAsync());
                Debug.WriteLine(response.StatusCode);
            }
        } catch (Exception ex) {
            Acr.UserDialogs.UserDialogs.Instance.ShowError(string.Format("Authentication Failed: {0}", ex.Message));
        }
    }
}

registerViewModel.cs

public class RegisterViewModel {
    public string Email {
        get;
        set;
    }
    public string Password {
        get;
        set;
    }
    public string ConfirmPassword {
        get;
        set;
    }
    public ICommand RegisterCommand {
        get {
            return new Command(async() => {
                ApiServices apiServices = new ApiServices();
                await apiServices.RegisterUserAsync(Email, Password, ConfirmPassword);
            });
        }
    }
}

loginViewModel.cs

public class LoginViewModel {
        public string Email {
            get;
            set;
        }
        public string Password {
            get;
            set;
        }
        public ICommand LoginCommand {
            get {
                return new Command(async() => {
                    ApiServices apiServices = new ApiServices();
                    await apiServices.LoginUserAsync(Email, Password);
                });
            }
        }
    }

Answer 1

安装Xam.Plugins.Settings。

它将添加一个名为Settings

的辅助类

在这个课程中你应该添加：

private const string IsLoginKey = "login_key";
private static readonly bool IsLoginDefault = false;

//Then adding this property
public static bool IsLogin
{
    get
    {
        return AppSettings.GetValueOrDefault(IsLoginKey, IsLoginDefault);
    }
    set
    {
        AppSettings.AddOrUpdateValue(IsLoginKey, value);
    }
}

然后在你的App.xaml.cs文件中这样：

using YourProjectNameSpace.Helper

.....

if (Settings.IsLoggedIn)
{
    MainPage = new NavigationPage(new MainPage());
}
else
{
    MainPage.DisplayAlert("Your Title","You Message","OK");
    //Or navigate to Login page, like this:  
    //MainPage = new NavigationPage(new LoginPage());
}

Xamarin跨平台 - 登录/注册

1 个答案: