Unexpected XML declaration in C# and Linq to xml

[Vahed Mamqaderi]

Hi

I want to open a xml entry in ZipArchive to editing it with Linq to XML.

This is my code :

using (FileStream fs = new FileStream(ProjectFileName, FileMode.OpenOrCreate, FileAccess.ReadWrite))
{
// create or read a zip archive with ZipArchive.
using (ZipArchive archive = new ZipArchive(fs, ZipArchiveMode.Update))
{
var entry = archive.Entries.SingleOrDefault(e => e.FullName.Contains(bilinearUang.PushOver.ModelName));
//ZipArchiveEntry entry = archive.GetEntry(bilinearUang.PushOver.ModelName + ".xml");
if (entry == null)
throw new Exception($"Not found '{bilinearUang.PushOver.ModelName + ".xml"}' ");
Stream entryStream = entry.Open();
entryStream.Position = 0;
XElement xEl = XElement.Load(entryStream);
var vs = xEl.Descendants(nameof(bilinearUang.Vs)).SingleOrDefault();
var ds = xEl.Descendants(nameof(bilinearUang.Delta_s)).SingleOrDefault();

if (vs != null) vs.Value = bilinearUang.Vs.ToString(CultureInfo.InvariantCulture);
if (ds != null) ds.Value = bilinearUang.Vs.ToString(CultureInfo.InvariantCulture);

xEl.Save(entryStream);
entryStream.Dispose();
}
}

but it's throw in exception:

System.Xml.XmlException: 'Unexpected XML declaration. The XML declaration must be the first node in the document, and no white space characters are allowed to appear before it. Line 414, position 14.'



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