如何解决强制转换异常处理问题 [英] how to resolve the cast exception handling

问题描述

我可以将一个文件上传到ftp服务器（驱动器hq）。但是发生了一个例外..那就是





无法将System.Net.HttpWebRequest类型的对象强制转换为System.Net.FtpWebRequest。

i can upload one file to ftp server(drive hq).but one exception is occured ..that is


"Unable to cast object of type 'System.Net.HttpWebRequest' to type 'System.Net.FtpWebRequest'."

推荐答案

简单：不要转换类型不赋值兼容。查看两个类的代码和MSDN帮助，它显示继承树中最近的类之间的继承;然后你很好看。如果没有，请学习继承，编译时和运行时类型以及OOP和.NET中的一般输入原则。

-SA

Simple: don't cast types which are not assignment-compatible. Look at your code and the MSDN help on both classes where it shows inheritance between nearest classes in inheritance tree; then you well see it. If not, learn inheritance, compile-time and runtime types and general typing principles in OOP and .NET.

—SA

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