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WP8 の C# から Windows Phone ランタイム コンポーネントを使う
private async void ReadFile()
// バイト配列に読み込んでから、MultiByteToWideChar()を通す
const string FileUrl = "ms-appx:///TextFile1.txt";
var storage = await StorageFile.GetFileFromApplicationUriAsync(new Uri(FileUrl));
using (var stream = await storage.OpenReadAsync())
byte[] buff = new byte[stream.Size];
await stream.AsStreamForRead().ReadAsync(buff, 0, buff.Length);
this.textBox2.Text = WindowsPhoneRuntimeComponent.MultiByteToWideCharWP8(buff);
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