[英]How write a file using StreamWriter in Windows 8?
在Windows-8中创建StreamWriter
对象时遇到麻烦,通常我只是创建一个实例,只是将字符串作为参数传递,但是在Windows 8中,我收到一条错误消息,指示它应该接收流,但是我注意到Stream是一个抽象类,有人知道如何编写xml文件吗?,顺便说一句,我正在使用.xml,因为我想保存序列化的对象,还是有人知道如何将序列化的对象保存到文件中在Windows 8中?
有任何想法吗?
当前使用Windows 8 Consumer Preview
码:
StreamWriter sw = new StreamWriter("person.xml");
错误:
The best overloaded method match for 'System.IO.StreamWriter.StreamWriter(System.IO.Stream)' has some invalid arguments
除了使用StreamWriter之外,您还可以使用以下方法:
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();
}
}
您可以查看WinRTXamlToolkit库中的StringIOExtensions类,以供示例使用。
编辑*
尽管以上所有方法都可以工作-它们是在WinRT中的FileIO
类可用之前编写的,这简化了上述解决方案解决的大多数常见情况,因为您现在可以调用await FileIO.WriteTextAsync(file, contents)
来将文本写入文件,还有类似的读取,写入或追加字符串,字节,字符串列表或IBuffers
。
您可以创建一个可以在整个应用程序中使用的通用静态方法,如下所示
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());
}
}
写xml只需使用
StorageFile file = await ApplicationData.Current.LocalFolder.CreateFileAsync("data.xml",CreationCollisionOption.ReplaceExisting);
await writeXml(Data,file);
并读取xml使用
StorageFile file = await ApplicationData.Current.LocalFolder.GetFileAsync("data.xml");
Data = await ReadXml<List<myclass>>(file);
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.