发布创建的文件 [英] Release Created File

问题描述

我有以下代码将 Base64 字符串转换为 PDF 文件，保存它然后尝试打开它:

I've got the following code that converts a Base64 string to a PDF file, saves it then tries to open it:

//Converts the Base64 data to bytes
byte[] bytes = Convert.FromBase64String(Base64String);

//Stores the converted Base64 data in the application's Local Resource directory, in PDF format
StorageFolder folder = ApplicationData.Current.LocalFolder;
string fileName = file.pdf";
CreationCollisionOption options = CreationCollisionOption.FailIfExists;

var file = await folder.CreateFileAsync(fileName, options);
var fs = await file.OpenAsync(Windows.Storage.FileAccessMode.ReadWrite);
var outStream = fs.GetOutputStreamAt(0);
var dataWriter = new Windows.Storage.Streams.DataWriter(outStream);
dataWriter.WriteBytes(bytes);
await dataWriter.StoreAsync();
dataWriter.DetachStream();
await outStream.FlushAsync();

string pdfPath = folder.Path + "\\" + fileName;

StorageFile fileToLaunch = await StorageFile.GetFileFromPathAsync(pdfPath);
await Windows.System.Launcher.LaunchFileAsync(fileToLaunch);

在 Adob​​e 阅读器中打开文件时，会显示一条消息，指出该文件仍在被其他应用程序使用.如何让我的应用程序发布"文件，以便 Adob​​e 可以打开它?请注意，这是一个 Windows 8 应用程序.

When the file opens in Adobe reader, there is a message saying the file is still in use by another application. How do I get my application to 'release' the file, so Adobe can open it? Please note this is a Windows 8 app.

推荐答案

我不得不将代码更改为以下内容:

I had to change the code to the following:

        var file = await folder.CreateFileAsync(fileName, options);

        using (var fs = await file.OpenAsync(Windows.Storage.FileAccessMode.ReadWrite))
        {
            using (var outStream = fs.GetOutputStreamAt(0))
            {
                using (var dataWriter = new Windows.Storage.Streams.DataWriter(outStream))
                {
                    dataWriter.WriteBytes(bytes);
                    await dataWriter.StoreAsync();
                    dataWriter.DetachStream();
                    await outStream.FlushAsync();
                }
            }
        }

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