在Mono上运行易趣C#SDK时出现未处理的异常

Question

我下载了易趣SDK，用于我们正在开发的内部应用程序。问题是我们正在Mono上开发。当我在.NET上运行易趣Hello World示例时，它会显示以下输出：

+++++++++++++++++++++++++++++++++++++++
+ Welcome to eBay SDK for .Net Sample +
+ - HelloWorld                        +
+++++++++++++++++++++++++++++++++++++++
Begin to call eBay API, please wait ...
End to call eBay API, show call result:
eBay official Time: 11/27/2013 3:02:19 PM

当我用Mono运行它时，我会得到以下结果：

Unhandled Exception: eBay.Service.Core.Sdk.ApiException: Exception has been thrown by the target of an invocation. 
---> System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation.
---> System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation.
---> System.InvalidOperationException: WebServiceBindingAttribute is required on proxy class 'eBay.Service.Core.Sdk.eBayAPIInterfaceService2'.
at System.Web.Services.Protocols.SoapTypeStubInfo..ctor (System.Web.Services.Protocols.LogicalTypeInfo logicalTypeInfo) [0x00000]
at (wrapper managed-to-native) System.Reflection.MonoCMethod:InternalInvoke (object,object[],System.Exception&)
etc...etc...etc...

我找到了一个变通办法，并将在下面的回答中发布。

Answer 1

我搜索了Xamarin的Bugzilla，但一无所获，但我在Novell的旧Mono Bugzilla中发现了这个相关的错误：https://bugzilla.novell.com/show_bug.cgi?id=693367

因此，我仔细查看了易趣SDK的来源，发现这确实是问题所在。eBay.Service.Core.Sdk.eBayAPIInterfaceService2继承自用System.Web.Services.WebServiceBindingAttribute装饰的eBay.Service.Core.Sdk.eBayAPIInterfaceService。

因此，我更改了eBay.Service.Core.Sdk.eBayAPIInterfaceService2，添加了[System.Web.Services.WebServiceBindingAttribute(Name = "eBayAPISoapBinding", Namespace = "urn:ebay:apis:eBLBaseComponents")]，使其现在看起来如下：

using System;
using System.Net;
using eBay.Service.Core.Soap;
namespace eBay.Service.Core.Sdk {
    /// <summary>
    /// Enhanced eBayAPIInterfaceService with GZIP compression support.
    /// </summary>
    [System.Web.Services.WebServiceBindingAttribute(Name = "eBayAPISoapBinding", Namespace = "urn:ebay:apis:eBLBaseComponents")]
    internal class eBayAPIInterfaceService2 : eBayAPIInterfaceService {
        ...
    }
}

我按照易趣SDK中的说明从源头构建，问题得到了解决。

---

脚注：顺便说一句，如果这是您第一次使用Mono连接到HTTPS web服务，您可能会立即遇到另一个异常。这个看起来像这样：

Unhandled Exception: System.Net.WebException: Error getting response stream (Write: The authentication or decryption has failed.): SendFailure ---> System.IO.IOException: The authentication or decryption has failed. ---> Mono.Security.Protocol.Tls.TlsException: Invalid certificate received from server. Error code: 0xffffffff800b010a
at Mono.Security.Protocol.Tls.Handshake.Client.TlsServerCertificate.validateCertificates (Mono.Security.X509.X509CertificateCollection certificates) [0x00000] in <filename unknown>:0 
at Mono.Security.Protocol.Tls.Handshake.Client.TlsServerCertificate.ProcessAsTls1 () [0x00000] in <filename unknown>:0 
at Mono.Security.Protocol.Tls.Handshake.HandshakeMessage.Process () [0x00000] in <filename unknown>:0 
at (wrapper remoting-invoke-with-check) Mono.Security.Protocol.Tls.Handshake.HandshakeMessage:Process ()
at Mono.Security.Protocol.Tls.ClientRecordProtocol.ProcessHandshakeMessage (Mono.Security.Protocol.Tls.TlsStream handMsg) [0x00000] in <filename unknown>:0 
at Mono.Security.Protocol.Tls.RecordProtocol.InternalReceiveRecordCallback (IAsyncResult asyncResult) [0x00000] in <filename unknown>:0 
--- End of inner exception stack trace ---
at Mono.Security.Protocol.Tls.SslStreamBase.AsyncHandshakeCallback (IAsyncResult asyncResult) [0x00000] in <filename unknown>:0 
--- End of inner exception stack trace ---
at System.Net.HttpWebRequest.EndGetResponse (IAsyncResult asyncResult) [0x00000] in <filename unknown>:0 
at System.Net.HttpWebRequest.GetResponse () [0x00000] in <filename unknown>:0 

有关解决方案，请访问此处：http://www.mono-project.com/FAQ:_Security