使用XmlWriter创建xml文件

Question

我在XmlWriter中遇到了Create方法的问题.

即使我使用msdn中的示例,它也无法正常工作. http://msdn.microsoft.com/en-us/library/kcsse48t.aspx

我为Windows商店应用创建了一个"空白页面"项目.在其中,我插入了来自msdn的示例代码,以测试XmlWriter类的工作方式.

VS给了我错误:

Cannot resolve method 'Create(string)', candidates are: 
System.Xml.XmlWriter Create(System.IO.Stream) (in class XmlWriter)
System.Xml.XmlWriter Create(System.IO.TextWriter) (in class XmlWriter)
System.Xml.XmlWriter Create(System.Text.StringBuilder) (in class XmlWriter)
System.Xml.XmlWriter Create(System.Xml.XmlWriter) (in class XmlWriter)

这在控制台应用程序中没有问题.但我需要制作一个Windows应用商店.

我希望最终做的是添加到现有的xml文件.

有人可以告诉我为什么这不起作用,或者如何以不同的方式达到我的目标.

感谢您的时间.

编辑:

对不起,我的代码:

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime;
using System.Xml;
using System.Xml.Linq;
using Windows.Data.Xml.Dom;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;

// The Blank Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=234238

namespace DatabaseTest
{
    /// <summary>
    /// An empty page that can be used on its own or navigated to within a Frame.
    /// </summary>
    public sealed partial class MainPage : Page
    {
        public MainPage()
        {
            this.InitializeComponent();
        }


        private void button_submit_Click(object sender, RoutedEventArgs e)
        {
            using (XmlWriter writer = XmlWriter.Create("output.xml"))
            {
                writer.WriteStartElement("book");
                writer.WriteElementString("price", "19.95");
                writer.WriteEndElement();
                writer.Flush();
            }
        }
    }
}

Answer 1

这是 Windows 应用商店应用程序，不是吗？编辑您的问题标签并尝试以下操作：

StorageFile file = await ApplicationData.Current.LocalFolder.CreateFileAsync("output.xml", CreationCollisionOption.ReplaceExisting);
using (IRandomAccessStream writeStream = await file.OpenAsync(FileAccessMode.ReadWrite))
{
  System.IO.Stream s =  writeStream.AsStreamForWrite();
  System.Xml.XmlWriterSettings settings = new System.Xml.XmlWriterSettings();
  settings.Async = true;
  using (System.Xml.XmlWriter writer = System.Xml.XmlWriter.Create(s, settings))
  {
    // Do stuff...

    await writer.FlushAsync();
  }
}

一旦您知道命名空间限定符有效，您就可以删除它。

检查此内容以了解如何在 Windows 应用商店应用程序中存储文件。另请查看示例。我的代码将使用本地应用程序文件夹，即类似：C:\Users\[name]\AppData\Local\Packages\[appName]\LocalState\