How do I read an XML using memorystream and streamreader?

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Hello!

I am using MemoryStream and StringBuilder and I want to read the XML file using StreamReader/StreamWriter.

Please help.

Regards
Aman

What I have tried:

C#

XDocument xdoc = new XDocument();
string filecontent = PreProcessXML(lvi.Tag.ToString()); //XML File

using (MemoryStream ms = new MemoryStream())
{
  using (StreamWriter sw = new StreamWriter(ms))
{
  sw.Write(filecontent);
  using (StreamReader sr = new StreamReader(ms))
{
  sr.ReadToEnd();
  xdoc = XDocument.Load(sr); //System.Xml.XmlException: 'Root element is missing.' I am getting this error here during execution.
}
}
}

C#

//Custom Function to change a few tags in the original XML for input.

C#

private string PreProcessXML(String xmlpath)
{
  StringBuilder sb = new StringBuilder();

  string openbreak = "";
  string closebreak = "";

  foreach (var line in File.ReadLines(xmlpath))
{
  if (line.StartsWith("<break "))
{
  openbreak = line.Replace("/", "");

  if (closebreak != "")
{
  sb.AppendLine(closebreak);
}
  else
  closebreak = "</break>";

  sb.AppendLine(openbreak);
}
  else
{
  if (line == "</sec>")
{
  sb.AppendLine(closebreak);
  closebreak = "";
}
  sb.AppendLine(line);
}
}
  return sb.ToString();
}

Posted 30-Jan-19 0:17am

Primo Chalice

Updated 30-Jan-19 0:36am

v3

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Comments

Richard MacCutchan 30-Jan-19 12:41pm

Why do you make things more complicated for yourself? Just feed the original file into the reader and you will not need all this extra processing.

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OriginalGriff · Answer 1 · 2019-01-30T00:29:00

Solution 1

Look at your code:

sr.ReadToEnd();
xdoc = XDocument.Load(sr);

So the stream is at the end of the data, and you pass it to the XML processor? Rewind it, so it is at some data!

using (MemoryStream ms = new MemoryStream())
    {
    using (StreamWriter sw = new StreamWriter(ms))
        {
        sw.Write(filecontent);
        using (StreamReader sr = new StreamReader(ms))
            {
            sr.BaseStream.Seek(0, SeekOrigin.Begin);
            ...
            }
        }
    }

Posted 30-Jan-19 0:29am

OriginalGriff

Comments

Primo Chalice 30-Jan-19 6:58am

The solution solved that issue but generated another one. SO I used the following approach and it worked :)

byte[] myByteArray = System.Text.Encoding.UTF8.GetBytes(filecontent);
MemoryStream ms = new MemoryStream(myByteArray);
StreamReader sr = new StreamReader(ms);
xdoc = XDocument.Load(sr);

Primo Chalice 30-Jan-19 6:59am

Also, please answer this question if you can. I really need a solution for this one:
https://www.codeproject.com/Questions/1275827/How-do-I-remove-the-child-nodes-but-still-keep-the

Regards