How to read file (Metro/WinRT)

问题:

I'm quite astounded by the apparent complexity of this seemingly simple task. I know that I have to use the StorageFile class, and I've found this example, but I just want to read one single file, to which I know the path, and read it's data as text into a string.

From what I've been able to gather, to read a file with StorageFile, I have to go through a bunch of interfaces; IAsyncOperation<StorageFile> and IAsyncOperationCompletedHandler.

There must be a better (simpler) way. Something like:

using (StorageFile sf = StorageFile.OpenAsync("myFile.txt"))
{
    string line = sf.ReadLine();
}

Obviously this doesn't work, but maybe I've missed something, or someone could explain to me how to read a file in a different way?

回答1:

This web page might be helpful: http://blog.jerrynixon.com/2012/06/windows-8-how-to-read-files-in-winrt.html

Relevant code:

public string CurrentFileBuffer
{
    get; private set;
}

public async void ReadTextFile(string Path)
{
    var folder = Package.Current.InstalledLocation;
    var file = await folder.GetFileAsync(Path);
    var read = await FileIO.ReadTextAsync(file);
    CurrentFileBuffer = read;
}

回答2:

Windows.Storage.FileIO has a bunch of helper/utility methods that do the job in a single line of code rather than using StorageIO interfaces and classes.

e.g.

ReadLineAsync()
ReadTextAsync()
WriteLineAsync()
WriteTextAsync()

回答3:

You can get your file by using this:

StorageFile file3 = await StorageFile.GetFileFromPathAsync(@"C:\myFile.txt");

回答4:

You can use the FileIO class like so.

public async void Read(IStorageFile file)
{
    var lines = await FileIO.ReadLinesAsync(file);

}