System.IO.File.OpenRead和System.IO.FileStream之间有什么区别？ [英] What is the Difference between System.IO.File.OpenRead AND System.IO.FileStream?

问题描述

大家好，

我的应用程序我正在阅读.PDF文件使用System.IO.FileStream（filePath）。当文件夹具有本地用户权限时，这工作正常。当我从文件夹中删除本地用户时，这会给出访问被拒绝错误。我使用这段代码...

Hello all,
n my application i am reading .PDF file useing System.IO.FileStream (filePath). This is working fine when folder have local user right. When i remove Local user right from folder that time this gives access denied error. I am use this code...

System.IO.FileStream objFStream = new System.IO.FileStream(strPath, System.IO.FileMode.Open);
        byte[] bytRead = new byte[(int)objFStream.Length];
        objFStream.Read(bytRead, 0, (int)objFStream.Length);
        objFStream.Close();
        objFStream.Dispose();

一旦我将System.IO.FileStream替换为System.IO.File.OpenRead（strPath）它会工作。替换代码是..

Once i replace System.IO.FileStream to System.IO.File.OpenRead(strPath) it will work. Replace code is..

System.IO.FileStream objFStream = System.IO.File.OpenRead(strPath);
            byte[] bytRead = new byte[(int)objFStream.Length];
            objFStream.Read(bytRead, 0, (int)objFStream.Length);
            objFStream.Close();
            objFStream.Dispose();

我想知道它们之间的区别是什么这个？

如果有人知道请帮忙。

I want to know what is the different between this?
If any one know please help.

推荐答案

看起来你已经得到了这个答案：

http://stackoverflow.com/问题/ 27397370 / system-io-file-openread-is-working-but-system-io-filestream-not-working [ ^ ]



祝你好运！

Looks like you already got this answered:
http://stackoverflow.com/questions/27397370/system-io-file-openread-is-working-but-system-io-filestream-is-not-working[^]

Good luck!

可能是因为你没有指定文件访问模式 [ ^ ]在你的流上，它试图打开Read and Write，但你的 File.OpenRead 正在打开以供只读使用。在你的流上尝试 FileAccess.Read 。

Probably because you have not specified a FileAccess mode[^] on your stream, it tries to open fro Read and Write, but your File.OpenRead is opening for read only. Try FileAccess.Read on your stream.

[public static FileStream OpenRead（string path）]等同于FileStream（String， FileMode，FileAccess，FileShare）构造函数重载，FileMode值为Open，FileAccess值为Read，FileShare值为Read。



参见文档 [ ^ ]这里..

[public static FileStream OpenRead(string path)] is equivalent to the FileStream(String, FileMode, FileAccess, FileShare) constructor overload with a FileMode value of Open, a FileAccess value of Read and a FileShare value of Read.

See Documentation[^] Here..

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