问题描述
FileStream的MSDN构造函数表示它可能会抛出UnauthorizedAccessException或SecurityException。以下是MSDN对这些例外的看法。
The MSDN constructor for a FileStream says that it may throw either an UnauthorizedAccessException or a SecurityException. Here's what MSDN says about these exceptions.
当操作系统由于I / O错误或特定类型的安全错误而拒绝访问时抛出的异常。
UnauthorizedAccessException:The exception that is thrown when the operating system denies access because of an I/O error or a specific type of security error.
检测到安全性错误时抛出的异常。
SecurityException:The exception that is thrown when a security error is detected.
这两个类似异常有如何不同？什么情况会触发任何一个？
How are these two similar exceptions different? What situations will trigger either of them?
推荐答案
A UnauthorizedAccessException 当访问磁盘上的文件时存在权限错误。这是操作系统级别的错误，例如正常用户试图覆盖操作系统文件（如kernel32.dll）。
A UnauthorizedAccessException is thrown when there is a permissions error accessing the file on disk. That is an error at the operating system level such as a normal user trying to overwrite an operating system file (like kernel32.dll).
A 如果CLR级别存在安全冲突，则抛出SecurityException 。例如，如果您作为低访问ClickOnce应用程序运行，并尝试读取/写入该进程中被CLR安全设置禁止的文件系统中的某个位置。
A SecurityException is thrown if there is a security violation at the CLR level. For example if you are running as a low access ClickOnce application and attempt to read / write to a place in the file system forbidden by the CLR security settings in the process.
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