使用 Unity 在 iOS 应用程序上发送电子邮件时出错

我正在开展一个学校项目，我正在尝试记录从我统一制作的游戏中存储的数据。

我的问题是我想通过电子邮件将数据发送到应用程序。一切正常，电子邮件与数据一起发送等。但是当我将应用程序构建到 iOS 设备时，它不会发送电子邮件。

我在 Unity 中没有任何错误，但是当我构建应用程序时，我在 Xcode 中收到此错误。请参阅下面的错误。我希望有一个人可以帮助我。

问候，

格奥尔基·伊利耶夫

MissingMethodException: Method not found: 'Default constructor not found...ctor() of System.Net.Configuration.MailSettingsSectionGroup'.
  at Mono.Security.Authenticode.AuthenticodeBase.GetSecurityEntry () [0x00000] in <filename unknown>:0 
  at System.Activator.CreateInstance (System.Type type, System.Object[] args) [0x00000] in <filename unknown>:0 
  at System.Configuration.Configuration.GetSectionGroupInstance (System.Configuration.SectionGroupInfo group) [0x00000] in <filename unknown>:0 
  at System.Configuration.ConfigurationSectionGroupCollection.get_Item (System.String name) [0x00000] in <filename unknown>:0 
  at System.Configuration.Configuration.GetSection (System.String path) [0x00000] in <filename unknown>:0 
  at System.Configuration.ClientConfigurationSystem.System.Configuration.Internal.IInternalConfigSystem.GetSection (System.String configKey) [0x00000] in <filename unknown>:0 
  at System.Configuration.ConfigurationManager.GetSection (System.String sectionName) [0x00000] in <filename unknown>:0 
  at System.Net.Mail.SmtpClient..ctor (System.String host, Int32 port) [0x00000] in <filename unknown>:0 
  at MonoGmail.Start () [0x00000] in <filename unknown>:0 

(Filename: currently not available on il2cpp Line: -1)

添加了@programmers解决方案并得到了一个新的混合错误。

MissingMethodException: Method not found: 'Default constructor not found...ctor() of System.Net.Configuration.MailSettingsSectionGroup'.
  at StartMenu.CloseApp () [0x00000] in <filename unknown>:0 
  at System.Activator.CreateInstance (System.Type type, Boolean nonPublic) [0x00000] in <filename unknown>:0 
  at System.Configuration.ConfigInfo.CreateInstance () [0x00000] in <filename unknown>:0 
  at System.Collections.Generic.Comparer`1[T].get_Default () [0x00000] in <filename unknown>:0 
  at System.Configuration.Configuration.GetSectionGroupInstance (System.Configuration.SectionGroupInfo group) [0x00000] in <filename unknown>:0 
  at System.Configuration.ConfigurationSectionGroupCollection.get_Item (System.String name) [0x00000] in <filename unknown>:0 
  at System.Configuration.Configuration.GetSection (System.String path) [0x00000] in <filename unknown>:0 
  at System.Configuration.ClientConfigurationSystem.System.Configuration.Internal.IInternalConfigSystem.GetSection (System.String configKey) [0x00000] in <filename unknown>:0 
  at System.MonoTODOAttribute..ctor () [0x00000] in <filename unknown>:0 
  at System.Configuration.ConfigurationManager.GetSection (System.String sectionName) [0x00000] in <filename unknown>:0 
  at System.Net.Mail.SmtpClient..ctor (System.String host, Int32 port) [0x00000] in <filename unknown>:0 
  at System.Net.Mail.SmtpClient..ctor (System.String host) [0x00000] in <filename unknown>:0 
  at Mono_Gmail.Start () [0x00000] in <filename unknown>:0 
  at System.Array.GetGenericValueImpl[T] (Int32 pos, .T& value) [0x00000] in <filename unknown>:0 
  at System.Array.GetGenericValueImpl[T] (Int32 pos, .T& value) [0x00000] in <filename unknown>:0 
  at System.Array.GetGenericValueImpl[T] (Int32 pos, .T& value) [0x00000] in <filename unknown>:0 
  at System.Array.GetGenericValueImpl[T] (Int32 pos, .T& value) [0x00000] in <filename unknown>:0 
System.Array:GetGenericValueImpl(Int32, T&)
System.Array:GetGenericValueImpl(Int32, T&)
System.Array:GetGenericValueImpl(Int32, T&)
System.Array:GetGenericValueImpl(Int32, T&)

(Filename: currently not available on il2cpp Line: -1)

这是一个bug https://issuetracker.unity3d.com/issues/il2cpp-crashes-when-using-smtpclient in IL2CPP。 Unity 没有任何计划很快解决这个问题，因为有一个临时解决方案可以解决它。

In your link.xml，添加以下内容。

<linker>
<assembly fullname="System">
<type fullname="System.Net.Configuration.MailSettingsSectionGroup" preserve="all"/>
<type fullname="System.Net.Configuration.SmtpSection" preserve="all"/>
<type fullname="System.Net.Configuration.SmtpNetworkElement" preserve="all"/>
</assembly>
</linker>

它基本上是告诉 Xcode 不要删除这些邮件内容。

如果你没有link.xml，创建它并将上面的代码放入其中，然后将文件放入 Asset 文件夹中。重建项目。

EDIT:

根据一个comment https://stackoverflow.com/questions/36087436/error-while-sending-email-on-ios-app-with-unity/36090450?noredirect=1#comment80411073_36090450下面，现在还需要添加以下行：

<type fullname="System.Net.Configuration.SmtpSpecifiedPickupDirectoryElement" preserve="all"/>