如何在Windows Phone 8.1 RT中将文件从Assets文件夹导出到手机的Documents文件夹？

Question

I'm trying to export a file from the Assets folder to the phone's Documents folder in Windows Phone 8.1 RT using C#. I've enabled documents library capability and able to access Documents Library. But I'm unable to copy a file.

Anyone?

Answer 1

I haven't tried copying a file from Assets, but I can write out a file to my phone's Documents folder ok:

var myFolder = KnownFolders.DocumentsLibrary;
var myFile = await myFolder.CreateFileAsync("test.txt", CreationCollisionOption.OpenIfExists);
await FileIO.WriteTextAsync(myFile, "hello world");

Do you have the correct File Type Association in the manifest? Should be something like:

<Extension Category="windows.fileTypeAssociation">
  <FileTypeAssociation Name="txt">
    <DisplayName>txt</DisplayName>
      <SupportedFileTypes>
        <FileType>.txt</FileType>
      </SupportedFileTypes>
  </FileTypeAssociation>
</Extension>