How do I return Xml with declaration using an ActionResult in ASP.NET MVC?

Question

I'm unable to attach a xml declaration while returning xml using Action Result. I can see it being included while debugging till line at which it returns xml in below code but doesn't not show up on the web.

What I am doing currently:

Getting Xml from Sql Server using XML PATH.

Returning xml string using XML Reader:

public XmlDocumentResult XmlData()
{
    String s = "<?xml version=\"1.0\" encoding=\"utf-8\" ?>" + "\n" +  this.GetData();
    byte[] encodedString = Encoding.UTF8.GetBytes(s);
    MemoryStream ms = new MemoryStream(encodedString);
    ms.Flush();
    ms.Position = 0;
    XmlDocument doc = new XmlDocument();
    doc.Load(ms);           
    return new XmlDocumentResult { XmlDocument = doc };
}

public class XmlDocumentResult : ContentResult
 {
     public XmlDocument XmlDocument { get; set; }

     public override void ExecuteResult(ControllerContext context)
     {
         if (XmlDocument == null)
             return;

         Content = XmlDocument.OuterXml;
         ContentType = "text/xml";
         base.ExecuteResult(context);
     }
 }

I have tried following code snippets from Stackoverflow:

XmlDeclaration xmldecl;
xmldecl = xmlDocument.CreateXmlDeclaration("1.0", "UTF-8", null);
XmlElement root = xmlDocument.DocumentElement;
xmlDocument.InsertBefore(xmldecl, root);


XmlNode docNode = xml.CreateXmlDeclaration("1.0", "UTF-8", null);
xml.AppendChild(docNode);

Tieson T. · Accepted Answer · 2018-08-22 21:37:36Z

3

Maybe try this:

public IActionResult Index()
{
    // you need to convert your xml to string
    var xmlString = "xml content..";
    return this.Content(xmlString, "text/xml");
}

See https://learn.microsoft.com/en-us/previous-versions/aspnet/web-frameworks/dd492713%28v%3dvs.100%29

edited Aug 22, 2018 at 21:37

Tieson T.

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answered Aug 22, 2018 at 21:28

Marcin Piwowarski

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4 Comments

Eicv Over a year ago

thanks i tried that but it didn't work either in my case. i am concatenating declaration to xml string and then returning it as content type xml.

Marcin Piwowarski Over a year ago

so maybe try return File(stream, "text/xml"); instead?

Eicv Over a year ago

Works thanks! I'm not sure why it wouldn't appear in Chrome but in IE

Marcin Piwowarski Over a year ago

I'm glad I helped :) if you see the result in the IE and not in chrome it's a matter of the frontend code. Open developer tools in each web browser and check the console log.

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