无法使用Xamarin在Android上创建文件 [英] Cannot create files on Android with Xamarin

问题描述

我有一个用于Android的Xamarin-Studio应用程序，我只想下载文件并将其保存在本地.但是，当我尝试在files文件夹中创建文件时，出现异常:

I have a Xamarin-Studio App for Android and I simply want to download files and save them locally. But when I try to create a file in the files folder I get an exception:

File.Create("data/data/com.company.app/files/newFile.png");

给我:

System.UnauthorizedAccessException
Access to the path 'data/data/com.company.app/files/newFile.png' is denied.

我做错了什么?

推荐答案

我终于意识到File.create()不是问题.我有这样的代码:

I finally realized that File.create() was not the problem. I had code like this:

string tmpFilePath = FilesDir.AbsolutePath.stringByAppendingPath (f.Path);
Java.IO.File tmpFile = new Java.IO.File( tmpFilePath);
tmpFile.Mkdirs ();

但是，Mkdirs()不仅创建了所有中间目录(正如我之前假设的那样)，而且还在文件路径本身上创建了一个目录.因此无法创建该文件，因为已经存在一个具有相同名称的目录. 正确的方法是:

Yet, Mkdirs() does not only create all intermediate directories – as I had assumed – but also creates a directory at the file path itself. So the file could not be created because there already was a directory with the same name. The correct way is:

string tmpFile = FilesDir.AbsolutePath.stringByAppendingPath (f.Path);
Java.IO.File tmpParentFolder = new Java.IO.File(tmpFile).getParentFile();
tmpParentFolder.Mkdirs ();

在我的辩护中，FileExistsAndIsDirectory异常比UnauthorizedAccessException

In my defense, an FileExistsAndIsDirectory exception would have been much more helpful than the UnauthorizedAccessException

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