Xamarin android保存文本文件 [英] Xamarin android save text file

问题描述

我正在使用Xamarin.Android，并且要将 .txt 文件保存到SD卡.这是我正在使用的代码:

I am using Xamarin.Android and I want to save a .txt file to the SD card. Here is the code that I am using:

  private void SavetoSd()
  {
       var sdCardPath = Android.OS.Environment.ExternalStorageDirectory.Path;
       var filePath = System.IO.Path.Combine(sdCardPath, "iootext.txt");
       if (!System.IO.File.Exists(filePath))
       {
           using(System.IO.StreamWriter write = new System.IO.StreamWriter(filePath,true))
           {
               write.Write(etSipServer.ToString());
           }
       }    
  }

但是，我收到以下错误消息:

However, I receive the following error:

System.UnauthorizedAccessException:访问路径"/mnt/sdcard/iootext.txt"被拒绝.

System.UnauthorizedAccessException: Access to the path "/mnt/sdcard/iootext.txt" is denied.

我在清单中添加了以下内容:

I have added the following to the manifest:

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

如何解决该错误?

推荐答案

如果您使用的是Android 6.0+，则需要执行运行时检查权限.可以这样完成:

If you're on Android 6.0+ you will need to perform a runtime check for permissions. This can be done like so:

if ((CheckSelfPermission(Permission.ReadExternalStorage) == (int)Permission.Granted) && 
    (CheckSelfPermission(Permission.WriteExternalStorage) == (int)Permission.Granted))

有关此问题的更多信息，请参见android文档此处.

More information on this can be found in the android documentation here.

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