win-universal-app - 从 Assets 文件夹 uwp 写入文件

Question

我想将文本内容写入位于 Assets 文件夹的文件中，因此我可以访问文件但我无权写入，我的代码是:

    try {
            //get the file
            StorageFile storageFile = await StorageFile.GetFileFromApplicationUriAsync(new Uri("ms-appx:///assets/test.txt"));

            //try to write sring to it
            await FileIO.WriteTextAsync(storageFile, "my string");

            } catch (Exception ex) {
            Debug.WriteLine("error: " + ex);

            }

我得到了错误:

    Exception thrown: 'System.UnauthorizedAccessException' in mscorlib.ni.dll
error: System.UnauthorizedAccessException: Access is denied. (Exception from HRESULT: 0x80070005 (E_ACCESSDENIED))
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
   at MyProject.MainPage.<overWriteHtmlSrcFile>d__6.MoveNext()

不得不提一下，由于应用场景，我需要更改此文件，或者是否有办法在公共(public)应用文件夹中创建此文件，然后将其移动到 Assets 中。

Answer 1

位于 Assets 文件夹中的文件是 只读 这就是你得到这个异常的原因。就像你最后提到的那样，有一种方法可以在公共(public)位置创建文件，将你需要的内容写入其中，然后将文件移动到 assets 文件夹中。它会是这样的:

 try {
            //create file in public folder
            StorageFolder storageFolder = ApplicationData.Current.LocalFolder;
            StorageFile sampleFile = await storageFolder.CreateFileAsync("test.txt", CreationCollisionOption.ReplaceExisting);

            //write sring to created file
            await FileIO.WriteTextAsync(sampleFile, htmlSrc);

            //get asets folder
            StorageFolder appInstalledFolder = Windows.ApplicationModel.Package.Current.InstalledLocation;
            StorageFolder assetsFolder = await appInstalledFolder.GetFolderAsync("Assets");

            //move file from public folder to assets
            await sampleFile.MoveAsync(assetsFolder, "new_file_name.txt", NameCollisionOption.ReplaceExisting);

            } catch (Exception ex) {
            Debug.WriteLine("error: " + ex);

            }