首页 \ 问答 \ 什么是托管扩展性框架（MEF）？(What is the Managed Extensibility Framework (MEF)? [closed])

什么是托管扩展性框架（MEF）？(What is the Managed Extensibility Framework (MEF)? [closed])

 我搜索了一些关于MEF的文章。 有人请简单解释一下： 
 

     
 
  •  什么是管理扩展性框架？ 
    •  
 
  •  它需要什么目的？ 
    •  
 
  •  我如何开始使用它？ 
    •  

 

 任何一步一步的指导将是有益的，谢谢！ 

I googled and got only a few articles about MEF. Would someone please explain in brief:
 

     
 
  • What is the Manage Extensibility Framework?
    •  
 
  • For what purpose is it needed?
    •  
 
  • How can I start working with it?
    •  

 

Any step by step guidance will be helpful, thanks!

原文：https://stackoverflow.com/questions/2286273
更新时间：2023-08-05 22:08

最满意答案

 显然，PayPal登录窗口中存在错误。 当PayPal登录中的密码字段包含“＆”字符时，将显示INTERNAL_SERVER_ERROR消息（如果凭据正确与否则无关紧要）： 
 

02-09 14:34:01.171: E/RequestError(6618): 500 http response received.  Response not parsable.
02-09 14:34:01.171: E/PayPalService(6618): INTERNAL_SERVER_ERROR
02-09 14:34:01.341: E/LoginActivity(6618): login error: INTERNAL_SERVER_ERROR

 

 如果密码中没有“＆”字符且凭据不正确，则日志中会显示有效的错误消息： 
 

02-09 14:33:48.741: E/RequestError(6618): , Mobile Login failed.
02-09 14:33:48.746: E/PayPalService(6618): 10803
02-09 14:33:49.206: E/LoginActivity(6618): login error: 10803

 

 我的密码包含“＆”字符。 当我更改密码而不包含密码时，我能够登录。 
 

 关注PayPal Android SDK GitHub页面的完整故事。 

Apparently there is a bug in PayPal login window. When a password field in the PayPal login contains "&" character, INTERNAL_SERVER_ERROR message is shown (does not matter if credentials are correct or not):
 

02-09 14:34:01.171: E/RequestError(6618): 500 http response received.  Response not parsable.
02-09 14:34:01.171: E/PayPalService(6618): INTERNAL_SERVER_ERROR
02-09 14:34:01.341: E/LoginActivity(6618): login error: INTERNAL_SERVER_ERROR

 

If there is no "&" character in password and credentials are not correct, a valid error message is shown in the log:
 

02-09 14:33:48.741: E/RequestError(6618): , Mobile Login failed.
02-09 14:33:48.746: E/PayPalService(6618): 10803
02-09 14:33:49.206: E/LoginActivity(6618): login error: 10803

 

My password contained "&" character. When I changed my password not to contain it, I was able to login.
 

Follow full story on PayPal Android SDK GitHub page.

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