I'm trying to create a Silverlight application (for the first time) that involves parsing XML from a site and displaying information. To do this I am using Visual Studio 2008 on Windows XP Service Pack 3. I also have .NET Framework 3.5 SP1 installed.
My problem is that no XML-parser I have seen on the internet works. The top of my code I have both lines I believe are necessary (using "System.xml;" and using "System.linq;") but XDocument, XMLReader, XMLDocument, and any others I have found do not work, returning the error that the type or namespace cannot be found. I do have .NET Framework.
I have turned absolutely nothing up on the internet regarding this problem. Does anyone have any ideas?
EDIT: I just discovered that when I open the file outside of the context of a Silverlight project, it is able to use XDocument. It is only when I open the entire project that my problem occurs
Here is some sample code showing the problem:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Xml.Linq; //Error 1 (See below)
namespace LastfmAmazon
{
public partial class Page : UserControl
{
public Page()
{
InitializeComponent();
}
public void DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
{
XDocument doc = XDocument.Parse(e.Result); //Error 2: see below
}
public void Button_Click(object sender, RoutedEventArgs e)
{
if (uname.Text != String.Empty)
{
App app = (App)Application.Current;
app.UserName = uname.Text;
String getTopArtists = "http://ws.audioscrobbler.com/2.0/?method=user.gettopartists&user=" + app.UserName + "&api_key=d2d620af554a60f228faed8d502c4936";
uname.Text = "Try Another One!";
WebClient web = new WebClient();
WebClient client = new WebClient();
client.DownloadStringCompleted += new DownloadStringCompletedEventHandler(DownloadStringCompleted);
client.DownloadStringAsync(new Uri(getTopArtists));
}
}
}
}
Error 1: This line contains the following error: The type or namespace name 'Linq' does not exist in the namespace 'System.Xml' (are you missing an assembly reference?)
Error 2: This line contains the following error: The type or namespace name 'XDocument' does not exist in the namespace 'System.Xml' (are you missing an assembly reference?)
EDIT 2: Once I Googled what it meant to "add a reference" to a library, Anthony's answer solved the problem.
By default a Silverlight project will contain the System.Xml dll however XDcoument is contained in the System.Xml.Linq dll, this you will have to add to your project.
Make sure you add a reference to the appropriate XML library
For XMLDocument, XMLReader, etc ...: System.Xml.Dll
For XDocument, XNode, etc ...: System.Xml.Linq.dll
Related
I have am developing in Unity 2019.2.3f1. I am trying to write a script that can Customize project files created by VSTU. In case the link ever gets removed, I have included a script very similar to the one from the link.
#if ENABLE_VSTU
using System.IO;
using System.Text;
using System.Xml.Linq;
using UnityEditor;
using SyntaxTree.VisualStudio.Unity.Bridge;
[InitializeOnLoad]
public class ProjectFileHook
{
private class Utf8StringWriter : StringWriter
{
public override Encoding Encoding => Encoding.UTF8;
}
static ProjectFileHook()
{
ProjectFilesGenerator.ProjectFileGeneration += (string name, string content) =>
{
// parse the document and make some changes
XDocument document = XDocument.Parse(content);
document.Root?.Add(new XComment("FIX ME"));
// save the changes using the Utf8StringWriter
Utf8StringWriter str = new Utf8StringWriter();
document.Save(str);
return str.ToString();
};
}
}
#endif
The issue is, using SyntaxTree.VisualStudio.Unity.Bridge; fails to compile due to the error error CS0246: The type or namespace name 'SyntaxTree' could not be found (are you missing a using directive or an assembly reference?).
I have checked both Unity and Visual Studio that the Visual Studio Tools for Unity are installed and enabled.
Why is the code failing to compile? Am I missing something that is preventing it from compiling?
Just incase anyone else has this issue.
This issue was being caused by the scripts position. The script has to be under the Editor folder, otherwise the script won't work as expected.
Credits to therealjohn for pointing it out here.
I am trying to process XML with C# in Visual Studio and it will not allow me to import System.Xml. I looked at other posts about this problem and this was usually caused by misspelling System.Xml to System.XML. I have the right spelling so I am not sure what is causing me problems. I looked under references and there is no System.Xml and I am using Visual Studio 2013 The error message was
Error 1 The type or namespace name 'Xml' does not exist in the namespace 'System' (are you missing an assembly reference?)
Do I have to download System.Xml?
Here is the code
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml;
namespace WebTesting
{
class Test1
{
public static void Main(string [] args)
{
using(XmlReader reader = XmlReader.Create("myData.Xml"))
{
while(reader.Reader())
{
if(reader.IsStartElement())
{
Console.Write("The start element is " + reader.ReadString());
}
}
}
Console.ReadLine();
}
}
}
You'll need to add an assembly reference. Right-click "References" under your project in Solution Explorer and select "Add Reference..." Switch to the .NET tab and find System.Xml. Click OK.
by using XDocument (in using System.Xml.Linq;) you'll get more flexible functionality to handling XML-documents
Im trying to use LINQ in my ASP.NET/C# website. For that I need to access the class 'modelDataContext' which is a part of the LINQ namespace.
Im using Visual Studio 2010 Professional
This is my C# code
using System;
using System.Collections.Generic;
using System.Linq;
using System.Data.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class admin_new_feed : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
modelDataContext data = new modelDataContext();
}
}
Full error message I get
Error 1 The type or namespace name 'modelDataContext' could not be
found (are you missing a using directive or an assembly
reference?)
Things i've tried, which doesn't solve problem
Adding the reference (Right-click solution, add reference - System.Data.Linq)
Re-create the website
Right clicking on the line, to see if the tab "Resolve" was there. But it wasn't.
I'm having what I think will probably be a really simple problem, in developing my first WP7 app I've come to the stage of accessing my Site's api and parsing the XML, however I'm stumbling just at trying to use XDocument.
I search around and found this example code: Load an XML file from a website into XDocument (Silverlight and Windows Phone 7) but the XDocument type does not exist, I understand it is supposed to exist in the System.Xml namespace which I am using, but the error still remains, what have I missed?
Developing on Visual Studio 2010 Express for Windows Phone, code for this class is below:
using System;
using System.Net;
using System.IO;
using System.Xml;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
namespace Application
{
public class DataRetriever
{
public void parseNewsXML()
{
WebClient client = new WebClient();
client.OpenReadCompleted += (sender, e) =>
{
if (e.Error != null)
return;
Stream str = e.Result;
XDocument xdoc = XDocument.Load(str);
};
}
}
Exact error being thrown is:
Error 1 The type or namespace name 'XDocument' could not be found (are you missing a using directive or an assembly reference?)
Thanks in advance
For Silverlight, that class is in System.Xml.Linq.dll, according to MSDN - so add a reference to System.Xml.Linq.dll. You will also need a using directive at the top of your code file:
using System.Xml.Linq;
(these are exactly the same two suggestions that the compiler itself makes: "are you missing a using directive or an assembly reference?")
I have the following code:
using System.Xml;
namespace MyApp {
public class Foo : IBar {
public void SomeCallback(object sender, CallbackEventArgs e) {
string s = e.Result;
System.Xml.XmlDocument xml; // <-- Error CS0234.
...
This results in error CS0234: The type or namespace name 'XmlDocument' does not exist in the namespace 'System.Xml' (are you missing an assembly reference?)
I have verified that System.Xml is included under "References" in Solution Explorer. It's listed as using 2.0.x.x, but that should be fine since the class allegedly existed then?
I'm not well versed in .net development, so I'm not sure how to troubleshoot this.
Based on the comment you posted to your question it looks like you are building a Silverlight application. The type XmlDocument is not included in the Silverlight version of the framework. The recommended alternative is XDocument
Here is a tutorial page on using XML in a Silverlight application
http://msdn.microsoft.com/en-us/library/cc189074(VS.95).aspx