blocks|key|373157|text|你可以使用下面这样的代码来代替StreamWriter：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|373158|StorageFolder+folder+=+ApplicationData.Current.LocalFolder;
StorageFile+file+=+await+folder.CreateFileAsync();

using+(IRandomAccessStream+fileStream+=+await+file.OpenAsync(FileAccessMode.ReadWrite))
{
++++using+(IOutputStream+outputStream+=+fileStream.GetOutputStreamAt(0))
++++{
++++++++using+(DataWriter+dataWriter+=+new+DataWriter(outputStream))
++++++++{
++++++++++++//TODO:+Replace+"Bytes"+with+the+type+you+want+to+write.
++++++++++++dataWriter.WriteBytes(bytes);
++++++++++++await+dataWriter.StoreAsync();
++++++++++++dataWriter.DetachStream();
++++++++}

++++++++await+outputStream.FlushAsync();
++++}
}|code-block|syntax|javascript|373159|您可以查看WinRTXamlToolkit库中的StringIOExtensions类以供示例使用。|offset|length|373160|编辑*|373161|虽然上面所有的方法都可以工作--它们是在WinRT中的FileIO类可用之前编写的，这简化了上面解决方案所解决的大多数常见场景，因为您现在只需调用await+FileIO.WriteTextAsync(file,+contents)将文本写入文件，并且也有类似的方法来读取、写入或附加字符串、字节、字符串列表或IBuffers。|style|CODE|373162|entityMap|0|LINK|mutability|MUTABLE|url|http://winrtxamltoolkit.codeplex.com/|1|http://winrtxamltoolkit.codeplex.com/SourceControl/changeset/view/12598#235918|2|http://msdn.microsoft.com/en-us/library/windows/apps/windows.storage.fileio.aspx|3|http://msdn.microsoft.com/en-us/library/windows/apps/windows.storage.fileio.writetextasync.aspx^0|0|0|5|G|0|O|I|1|0|0|R|6|21|17|4B|8|R|6|2|21|17|3|0^^$0|@$1|2|3|4|5|6|7|14|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|15|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|16|8|@]|9|@$I|17|J|18|1|19]|$I|1A|J|1B|1|1C]]|A|$]]|$1|K|3|L|5|6|7|1D|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|1E|8|@$I|1F|J|1G|O|P]|$I|1H|J|1I|O|P]|$I|1J|J|1K|O|P]]|9|@$I|1L|J|1M|1|1N]|$I|1O|J|1P|1|1Q]]|A|$]]|$1|Q|3|-4|5|6|7|1R|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X]]|Y|$5|T|U|V|A|$W|Z]]|10|$5|T|U|V|A|$W|11]]|12|$5|T|U|V|A|$W|13]]]]

Instead of StreamWriter you would use something like this:

<pre><code>StorageFolder folder = ApplicationData.Current.LocalFolder;
StorageFile file = await folder.CreateFileAsync();

using (IRandomAccessStream fileStream = await file.OpenAsync(FileAccessMode.ReadWrite))
{
 using (IOutputStream outputStream = fileStream.GetOutputStreamAt(0))
 {
 using (DataWriter dataWriter = new DataWriter(outputStream))
 {
 //TODO: Replace "Bytes" with the type you want to write.
 dataWriter.WriteBytes(bytes);
 await dataWriter.StoreAsync();
 dataWriter.DetachStream();
 }

 await outputStream.FlushAsync();
 }
}
</code></pre>

You can look at the <a href="http://winrtxamltoolkit.codeplex.com/SourceControl/changeset/view/12598#235918">StringIOExtensions</a> class in the <a href="http://winrtxamltoolkit.codeplex.com/">WinRTXamlToolkit</a> library for sample use.

EDIT*

While all the above should work - they were written before the <a href="http://msdn.microsoft.com/en-us/library/windows/apps/windows.storage.fileio.aspx"><code>FileIO</code></a> class became available in WinRT, which simplifies most of the common scenarios that the above solution solves since you can now just call <a href="http://msdn.microsoft.com/en-us/library/windows/apps/windows.storage.fileio.writetextasync.aspx"><code>await FileIO.WriteTextAsync(file, contents)</code></a> to write text into file and there are also similar methods to read, write or append strings, bytes, lists of strings or <code>IBuffers</code>.

blocks|key|373205|text|您可以创建一个通用的静态方法，它可以通过我们的应用程序使用，如下所示|type|unstyled|depth|inlineStyleRanges|entityRanges|data|373206|+private+async+Task<T>+ReadXml<T>(StorageFile+xmldata)
++++{
++++++++XmlSerializer+xmlser+=+new+XmlSerializer(typeof(List<myclass>));
++++++++T+data;
++++++++using+(var+strm+=+await+xmldata.OpenStreamForReadAsync())
++++++++{
++++++++++++TextReader+Reader+=+new+StreamReader(strm);
++++++++++++data+=+(T)xmlser.Deserialize(Reader);
++++++++}
++++++++return+data;
++++}

++++private+async+Task+writeXml<T>(T+Data,+StorageFile+file)
++++{
++++++++try
++++++++{
++++++++++++StringWriter+sw+=+new+StringWriter();
++++++++++++XmlSerializer+xmlser+=+new+XmlSerializer(typeof(T));
++++++++++++xmlser.Serialize(sw,+Data);

++++++++++++using+(IRandomAccessStream+fileStream+=+await+file.OpenAsync(FileAccessMode.ReadWrite))
++++++++++++{
++++++++++++++++using+(IOutputStream+outputStream+=+fileStream.GetOutputStreamAt(0))
++++++++++++++++{
++++++++++++++++++++using+(DataWriter+dataWriter+=+new+DataWriter(outputStream))
++++++++++++++++++++{
++++++++++++++++++++++++dataWriter.WriteString(sw.ToString());
++++++++++++++++++++++++await+dataWriter.StoreAsync();
++++++++++++++++++++++++dataWriter.DetachStream();
++++++++++++++++++++}

++++++++++++++++++++await+outputStream.FlushAsync();
++++++++++++++++}
++++++++++++}


++++++++}
++++++++catch+(Exception+e)
++++++++{
++++++++++++throw+new+NotImplementedException(e.Message.ToString());

++++++++}

++++}|code-block|syntax|javascript|373207|要编写xml，只需使用|373208|+StorageFile+file+=+await+ApplicationData.Current.LocalFolder.CreateFileAsync("data.xml",CreationCollisionOption.ReplaceExisting);
++++++++await++writeXml(Data,file);|373209|和读取xml的使用|373210|++StorageFile+file+=+await+ApplicationData.Current.LocalFolder.GetFileAsync("data.xml");
++++++Data+=++await++ReadXml<List<myclass>>(file);|373211|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

You can create a common static method which you can use through out application like this 

<pre><code> private async Task&lt;T&gt; ReadXml&lt;T&gt;(StorageFile xmldata)
 {
 XmlSerializer xmlser = new XmlSerializer(typeof(List&lt;myclass&gt;));
 T data;
 using (var strm = await xmldata.OpenStreamForReadAsync())
 {
 TextReader Reader = new StreamReader(strm);
 data = (T)xmlser.Deserialize(Reader);
 }
 return data;
 }

 private async Task writeXml&lt;T&gt;(T Data, StorageFile file)
 {
 try
 {
 StringWriter sw = new StringWriter();
 XmlSerializer xmlser = new XmlSerializer(typeof(T));
 xmlser.Serialize(sw, Data);

 using (IRandomAccessStream fileStream = await file.OpenAsync(FileAccessMode.ReadWrite))
 {
 using (IOutputStream outputStream = fileStream.GetOutputStreamAt(0))
 {
 using (DataWriter dataWriter = new DataWriter(outputStream))
 {
 dataWriter.WriteString(sw.ToString());
 await dataWriter.StoreAsync();
 dataWriter.DetachStream();
 }

 await outputStream.FlushAsync();
 }
 }


 }
 catch (Exception e)
 {
 throw new NotImplementedException(e.Message.ToString());

 }

 }
</code></pre>

to write xml simply use 

<pre><code> StorageFile file = await ApplicationData.Current.LocalFolder.CreateFileAsync("data.xml",CreationCollisionOption.ReplaceExisting);
 await writeXml(Data,file);
</code></pre>

and to read xml use 

<pre><code> StorageFile file = await ApplicationData.Current.LocalFolder.GetFileAsync("data.xml");
 Data = await ReadXml&lt;List&lt;myclass&gt;&gt;(file);
</code></pre>

I'm having trouble when creating a <code>StreamWriter</code> object in windows-8, usually I just create an instance just passing a string as a parameter, but in Windows 8 I get an error that indicates that it should recieve a Stream, but I noticed that Stream is an abstract class, Does anybody knows how will be the code to write an xml file?, BTW I'm using .xml because I want to save the serialized object, or does anyone knows how to save to a file a serialized object in Windows 8?.

Any ideas?

Currently using Windows 8 Consumer Preview

Code:

<code>StreamWriter sw = new StreamWriter("person.xml");</code>

Error: 

<code>The best overloaded method match for 'System.IO.StreamWriter.StreamWriter(System.IO.Stream)' has some invalid arguments</code>

How write a file using StreamWriter in Windows 8?

我在windows-8中创建StreamWriter对象时遇到了麻烦，通常我只是创建一个实例，只是传递一个字符串作为参数，但在Windows8中我得到一个错误，指示它应该接收一个流，但我注意到流是一个抽象类，有人知道如何编写xml文件的代码吗? BTW我使用.xml是因为我想保存序列化的对象，或者有人知道如何在Wind...

问如何在Windows8中使用StreamWriter编写文件？
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