如何在 ASP.NET MVC 中使用 ActionResult 返回带有声明的 Xml？

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:

1. Getting Xml from Sql Server using XML PATH.

2. 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);

Answer 1

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