何时使用MSAL AcquireTokenSilentAsync [英] When to use MSAL AcquireTokenSilentAsync

问题描述

我正在对Xamarin.Forms使用MSAl，并在 Xamarin上实现了示例使用Azure AD B2C授权

I am using MSAl for Xamarin.Forms and implemented the sample on Xamarin Authorization with Azure AD B2C

在示例中，从LoginPage的OnAppearing() -Method(视图)(从LoginAsync(true)委托)调用AcquireTokenSilentAsync() -Method.登录页面是此示例应用程序的启动页面.

In the sample the AcquireTokenSilentAsync()-Method is called from the OnAppearing()-Method of the LoginPage (the View) (delegated from LoginAsync(true)). The login page is the start-up page of this sample app.

我的问题是，我必须在逻辑之前在任何视图(或视图模型)中调用AcquireTokenSilentAsync()还是足以在启动页面上使用它?如果我必须在任何视图/视图模型上使用它，这似乎是一个方面.您是通过使用某些AOP模式还是在每个视图/视图模型上真正调用此方法来解决此问题?

My question is, do I have to call AcquireTokenSilentAsync() in any view (or view model) before my logic or is it enough to use it on my start-up page? If I have to use it on any view/view model it seems this is kind of an aspect. Do you solve this by using some AOP pattern or really calling this method on each and every view/view model?

推荐答案

我现在在启动时立即调用AquireTokenSilentAsync.

I now call AquireTokenSilentAsync once on startup.

他们现在对如何使用它有很好的解释: https://github. com/AzureAD/microsoft-authentication-library-for-dotnet/wiki/AcquireTokenSilentAsync-using-a-cached-token

They now have a great explanation how to use it: https://github.com/AzureAD/microsoft-authentication-library-for-dotnet/wiki/AcquireTokenSilentAsync-using-a-cached-token

使用Msal 2.x的公共客户端应用程序中的推荐呼叫模式

Recommended call pattern in public client applications with Msal 2.x

AuthenticationResult result = null;
var accounts = await app.GetAccountsAsync();

try
{
 result = await app.AcquireTokenSilentAsync(scopes, accounts.FirstOrDefault());
}
catch (MsalUiRequiredException ex)
{
 // A MsalUiRequiredException happened on AcquireTokenSilentAsync. 
 // This indicates you need to call AcquireTokenAsync to acquire a token
 System.Diagnostics.Debug.WriteLine($"MsalUiRequiredException: {ex.Message}");

 try
 {
    result = await app.AcquireTokenAsync(scopes);
 }
 catch (MsalException msalex)
 {
    ResultText.Text = $"Error Acquiring Token:{System.Environment.NewLine}{msalex}";
 }
}
catch (Exception ex)
{
 ResultText.Text = $"Error Acquiring Token Silently:{System.Environment.NewLine}{ex}";
 return;
}

if (result != null)
{
 string accessToken = result.AccessToken;
 // Use the token
}

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