无法在 try-catch C# 中捕获异常

Question

这个异常被抛出了，我显然没有办法捕捉它：

无法建立连接，因为目标机器主动拒绝了它 127.0.0.1:10000

来源：

Line 102:            try
Line 103:            {
Line 104:                var blobClient = GetClient();  <-- throws here
Line 105:                var container = blobClient.GetContainerReference(containerName);
Line 106:                container.CreateIfNotExists(BlobContainerPublicAccessType.Blob);

源文件：...Blob.cs 行：104

整个函数：

private static CloudBlobContainer GetContainer(string containerName)
{
    try
    {
        var blobClient = GetClient();
        var container = blobClient.GetContainerReference(containerName);
        container.CreateIfNotExists(BlobContainerPublicAccessType.Blob);
        return container;
    }
    catch (HttpException ex)
    {
        Helpers.Error.Functions.RecordError(ex);
        throw new HttpException(500, "Could not connect.");
    }
}

GetClient() 函数：

private static CloudBlobClient GetClient()
{
    try
    {
        var account = CloudStorageAccount.Parse(Settings.Deployment.AzureConnectionString);
        return account.CreateCloudBlobClient();
    }
    catch (Exception ex)
    {
        Helpers.Error.Functions.RecordError(ex);
        throw new HttpException(500, "Could not connect GetClient.");
    }
}

堆栈跟踪：

[SocketException (0x274d): 无法建立连接，因为 目标机器主动拒绝它 127.0.0.1:10000]
System.Net.Sockets.Socket.DoConnect（端点 endPointSnapshot， SocketAddress socketAddress) +520
System.Net.ServicePoint.ConnectSocketInternal（布尔连接失败， Socket s4, Socket s6, Socket&socket, IPAddress&地址, ConnectSocketState 状态、IAsyncResult asyncResult、Exception& 例外）+621

[WebException：无法连接到远程服务器]
System.Net.HttpWebRequest.GetResponse() +1724
Microsoft.WindowsAzure.Storage.Core.Executor.Executor.ExecuteSync（RESTCommand`1 cmd, IRetryPolicy 策略, OperationContext operationContext) 中 c:\程序文件 (x86)\Jenkins\workspace\release_dotnet_master\Lib\ClassLibraryCommon\Core\Executor\Executor.cs:699

[StorageException：无法连接到远程服务器]
Microsoft.WindowsAzure.Storage.Core.Executor.Executor.ExecuteSync（RESTCommand`1 cmd, IRetryPolicy 策略, OperationContext operationContext) 中 c:\程序文件 (x86)\Jenkins\workspace\release_dotnet_master\Lib\ClassLibraryCommon\Core\Executor\Executor.cs:604 Microsoft.WindowsAzure.Storage.Blob.CloudBlobContainer.CreateIfNotExists(BlobContainerPublicAccessType accessType、BlobRequestOptions requestOptions、OperationContext operationContext) 在 c:\Program Files (x86)\Jenkins\workspace\release_dotnet_master\Lib\ClassLibraryCommon\Blob\CloudBlobContainer.cs:233 C3.Code.Controls.Application.Storage.Blob.Blob.GetContainer（字符串 容器名称）在 ...Blob.cs:104
C3.Code.Controls.Application.Storage.Blob.Blob.AddBlob（字符串 D:\Dropbox 中的容器名称、字符串 blobReference、字节 [] 字节） (Scirra Ltd)\汤姆\C3 网站\C3Alpha2\Code\Controls\Application\Storage\Blob\Blob.cs:87
D:\Dropbox (Scirra) 中的 C3.Code.Callbacks.Application.ApplicationStart() Ltd)\Tom\C3 网站\C3Alpha2\Code\Callbacks\Application.cs:26
D:\Dropbox 中的 C3.Global.Application_Start(Object sender, EventArgs e) (Scirra Ltd)\Tom\C3 网站\C3Alpha2\Global.asax.cs:30

[HttpException (0x80004005): 无法连接到远程服务器]
System.Web.HttpApplicationFactory.EnsureAppStartCalledForIntegratedMode（HttpContext 上下文，HttpApplication 应用程序）+534
System.Web.HttpApplication.RegisterEventSubscriptionsWithIIS（IntPtr appContext、HttpContext 上下文、MethodInfo[] 处理程序）+186
System.Web.HttpApplication.InitSpecial（HttpApplicationState 状态， MethodInfo[] 处理程序、IntPtr appContext、HttpContext 上下文）+175
System.Web.HttpApplicationFactory.GetSpecialApplicationInstance（IntPtr appContext、HttpContext 上下文）+424
System.Web.Hosting.PipelineRuntime.InitializeApplication（IntPtr appContext) +360

[HttpException (0x80004005): 无法连接到远程服务器]
System.Web.HttpRuntime.FirstRequestInit(HttpContext 上下文) +539
System.Web.HttpRuntime.EnsureFirstRequestInit（HttpContext 上下文） +118 System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest WR，HttpContext 上下文）+730

Answer 1

来自您发布的异常消息：

[SocketException (0x274d): 无法建立连接，因为目标机器主动拒绝了它 127.0.0.1:10000]

请注意，这是 SocketException，而不是 HttpException，但您的代码是这样写的：

catch (HttpException ex)

所以它没有被抓住。要么使用通用 Exception 捕获所有内容，要么切换到捕获 SocketException。