Question

尝试使用缓存的令牌时出现以下错误。我使用此处提供的列表作为示例：https://docs.microsoft.com/bs-latn-ba/azure/active-directory/develop/msal-net-acquire-token-silently

无法从“ System.Collections.Generic.IEnumerable”转换为“ Microsoft.Identity.Client.IAccount”`

        static async Task<GraphServiceClient> Auth()
        {

            var clientApp = PublicClientApplicationBuilder.Create(ConfigurationManager.AppSettings["clientId"]).Build();
            string[] scopes = new string[] { "user.read" };
            string token = null;
            var app = PublicClientApplicationBuilder.Create(ConfigurationManager.AppSettings["clientId"]).Build();
            AuthenticationResult result = null;
            var accounts = await app.GetAccountsAsync();

                result = await app.AcquireTokenSilent(scopes, accounts)
                       .ExecuteAsync();
                token = result.AccessToken;

            GraphServiceClient graphClient = new GraphServiceClient(
                        "https://graph.microsoft.com/v1.0",
                        new DelegateAuthenticationProvider(
                            async (requestMessage) =>
                            {
                                requestMessage.Headers.Authorization = new AuthenticationHeaderValue("bearer", token);
                            }));
            return graphClient;
        }

Answer 1

引起错误的呼叫就是这个

result = await app.AcquireTokenSilent(scopes, accounts)
                  .ExecuteAsync();

AcquireTokenSilent需要两个变量，IEnumerable<String>（作用域）和string（loginHint）。当您将loginHist传递给一个字符串（单个帐户）时，将传递一组帐户。

var accounts = await app.GetAccountsAsync();

GetAccountsAsync()的返回类型为IEnumerable，这就是为什么它在该调用时引发错误的原因。

在example here中，从列表中查找的帐户。

// Get the account
IAccount account = await application.GetAccountAsync(accountIdentifier).ConfigureAwait(false);

// Special case for guest users as the Guest oid / tenant id are not surfaced.
if (account == null)
{
    if (loginHint == null)
        throw new ArgumentNullException(nameof(loginHint));

    var accounts = await application.GetAccountsAsync().ConfigureAwait(false);
    account = accounts.FirstOrDefault(a => a.Username == loginHint);
}

将此行添加到您的代码中：

var accounts = await app.GetAccountsAsync();
IAccount account = accounts.FirstOrDefault(a => a.Username == loginHint); // <--- Get Account from accounts
result = await app.AcquireTokenSilent(scopes, account) // Use account instead of accounts.
                  .ExecuteAsync();
token = result.AccessToken;

尝试使用缓存的令牌时出现“无法转换”错误

1 个答案: