使用.Result时无法捕获Task中引发的异常

Question

我有一种从KeyVault检索值的方法，如下所示：

    public async Task<string> GetSecretAsync(string secret)
    {
        var azureServiceTokenProvider = new AzureServiceTokenProvider();
        var keyVaultClient = new KeyVaultClient(new KeyVaultClient.AuthenticationCallback(azureServiceTokenProvider.KeyVaultTokenCallback));

        try
        {
            var retrievedSecret = await keyVaultClient.GetSecretAsync($"{VaultUrl}/secrets/{secret}");
            return retrievedSecret.Value;
        }
        catch (Exception e)
        {
            if (e.Message.Contains("Forbidden"))
            {
                throw new KeyVaultForbiddenException("Keyvault request refused");
            }
            else if (e.Message.Contains("NotFound"))
            {
                throw new KeyVaultSecretNotFoundException("Requested secret not found");
            }

            Trace.WriteLine($"Exception getting secret: {e.Message}");
            throw e;
        }
    }

在异步方法中可以正常工作。

现在我正尝试在同步方法（实际上是构造函数）中使用它，但它失败了-主要问题是我无法捕获异常来真正找出问题所在

这是我尝试使用它的方式：

    public MongoRepository(IKeyVaultService KeyVaultService)
    {
        this.collectionName = typeof(T).Name;

        var databaseName = KeyVaultService.GetSecretAsync("mongoDatabaseName").Result;
        var databaseConnectionString = KeyVaultService.GetSecretAsync("mongoDatabaseConnectionString").Result;

        SetDatabase(databaseName, databaseConnectionString);
        SetCollection();
    }

一旦代码移开：

var retrievedSecret = await keyVaultClient.GetSecretAsync($"{VaultUrl}/secrets/{secret}");

它失败了，我无法捕捉到异常。我可以在输出控制台中看到以下内容：

Exception thrown: 'Microsoft.Rest.TransientFaultHandling.HttpRequestWithStatusException' in Microsoft.Rest.ClientRuntime.dll
Exception thrown: 'Microsoft.Rest.TransientFaultHandling.HttpRequestWithStatusException' in mscorlib.dll
Exception thrown: 'System.Net.Sockets.SocketException' in System.dll
Exception thrown: 'System.Net.WebException' in System.dll
Exception thrown: 'System.Net.WebException' in System.dll
Exception thrown: 'System.Net.Http.HttpRequestException' in mscorlib.dll
Exception thrown: 'Microsoft.Azure.Services.AppAuthentication.AzureServiceTokenProviderException' in Microsoft.Azure.Services.AppAuthentication.dll
Exception thrown: 'Microsoft.Azure.Services.AppAuthentication.AzureServiceTokenProviderException' in mscorlib.dll
Exception thrown: 'Microsoft.Azure.Services.AppAuthentication.AzureServiceTokenProviderException' in mscorlib.dll
Exception thrown: 'System.Exception' in Microsoft.Azure.Services.AppAuthentication.dll
Exception thrown: 'Microsoft.Azure.Services.AppAuthentication.AzureServiceTokenProviderException' in Microsoft.Azure.Services.AppAuthentication.dll
Exception thrown: 'Microsoft.Azure.Services.AppAuthentication.AzureServiceTokenProviderException' in mscorlib.dll
Exception thrown: 'Microsoft.Azure.Services.AppAuthentication.AzureServiceTokenProviderException' in mscorlib.dll
Exception thrown: 'System.ObjectDisposedException' in System.dll
Exception thrown: 'System.ObjectDisposedException' in System.dll
Exception thrown: 'System.ObjectDisposedException' in System.dll
Exception thrown: 'System.Exception' in mscorlib.dll
Exception thrown: 'Microsoft.Azure.Services.AppAuthentication.AzureServiceTokenProviderException' in Microsoft.Azure.Services.AppAuthentication.dll
Exception thrown: 'Microsoft.Azure.Services.AppAuthentication.AzureServiceTokenProviderException' in mscorlib.dll
Exception thrown: 'Microsoft.Azure.Services.AppAuthentication.AzureServiceTokenProviderException' in mscorlib.dll
Exception thrown: 'Microsoft.IdentityModel.Clients.ActiveDirectory.AdalSilentTokenAcquisitionException' in Microsoft.IdentityModel.Clients.ActiveDirectory.dll
Exception thrown: 'Microsoft.IdentityModel.Clients.ActiveDirectory.AdalSilentTokenAcquisitionException' in mscorlib.dll
Exception thrown: 'Microsoft.IdentityModel.Clients.ActiveDirectory.AdalSilentTokenAcquisitionException' in Microsoft.IdentityModel.Clients.ActiveDirectory.dll
Exception thrown: 'Microsoft.IdentityModel.Clients.ActiveDirectory.AdalSilentTokenAcquisitionException' in mscorlib.dll
Exception thrown: 'Microsoft.IdentityModel.Clients.ActiveDirectory.AdalSilentTokenAcquisitionException' in mscorlib.dll
Exception thrown: 'Microsoft.IdentityModel.Clients.ActiveDirectory.AdalSilentTokenAcquisitionException' in mscorlib.dll
Exception thrown: 'Microsoft.IdentityModel.Clients.ActiveDirectory.AdalSilentTokenAcquisitionException' in mscorlib.dll
Exception thrown: 'Microsoft.IdentityModel.Clients.ActiveDirectory.AdalSilentTokenAcquisitionException' in mscorlib.dll

任何朝着正确方向指向的点都很棒！