如何将StreamReader转换为.Net 2.0/C中的XMLReader对象#

Question

这是一个很快的问题,我今天一直在抨击我的头脑.

我正在尝试将.Net数据集转换为XML流,使用内存中的xsl文件对其进行转换,然后将结果输出到新的XML文件.

这是目前的解决方案:

        string transformXML = @"pathToXslDocument";

        XmlDocument originalXml = new XmlDocument();

        XmlDocument transformedXml = new XmlDocument();

        XslCompiledTransform transformer = new XslCompiledTransform();

        DataSet ds = new DataSet();

        string filepath;

        originalXml.LoadXml(ds.GetXml()); //data loaded prior

        StringBuilder sb = new StringBuilder();

        XmlWriter writer = XmlWriter.Create(sb);

        transformer.Load(transformXML);

        transformer.Transform(originalXml, writer); //no need to select the node

        transformedXml.LoadXml(sb.ToString());

        transformedXml.Save(filepath);

        writer.Close();

这是原始代码:

BufferedStream stream = new BufferedStream(new MemoryStream());

DataSet ds = new DataSet();

da.Fill(ds);

ds.WriteXml(stream);

StreamReader sr = new StreamReader(stream, true);

stream.Position = 0; //I'm not certain if this is necessary, but for the StreamReader to read the text the position must be reset.

XmlReader reader = XmlReader.Create(sr, null);  //Problem is created here, the XmlReader is created with none of the data from the StreamReader

XslCompiledTransform transformer = new XslCompiledTransform();

transformer.Load(@"<path to xsl file>");

transformer.Transform(reader, null, writer); //Exception is thrown here, though the problem originates from the XmlReader.Create(sr, null)

由于某些原因在transformer.Transform方法中,读者没有根节点,实际上读者没有从StreamReader中读取任何内容.

我的问题是这段代码有什么问题？其次,有没有更好的方法将数据集转换/转换/存储到XML？

编辑:两个答案都很有帮助,技术上aku更接近.然而,我倾向于在尝试两种解决方案后更接近Longhorn的解决方案.

Answer 1

我不确定,但似乎你没有在将流传递给XmlReader之前重置流中的位置.在尝试从中读取之前,尝试在流的开头搜索.在向它写入一些数据后,可能还需要关闭\ flush stream.

编辑:

只是尝试了下面的代码,它完美地工作:

    BufferedStream stream = new BufferedStream(new MemoryStream());
    stream.Write(Encoding.ASCII.GetBytes("<xml>foo</xml>"), 0, "<xml>foo</xml>".Length);
    stream.Seek(0, SeekOrigin.Begin);
    StreamReader sr = new StreamReader(stream);
    XmlReader reader = XmlReader.Create(sr);
    while (reader.Read())
    {
         Console.WriteLine(reader.Value);
    }
    stream.Close();