Fix an assembly reference in a Visual Studio Tools for Unity project

ProjectFileHook.cs

using System;
using System.IO;
using System.Linq;
using System.Text;
using System.Xml.Linq;
using UnityEditor;
using SyntaxTree.VisualStudio.Unity.Bridge;
using UnityEngine;

[InitializeOnLoad]
public class ProjectFileHook
{
    // necessary for XLinq to save the xml project file in utf8
    class Utf8StringWriter : StringWriter
    {
        public override Encoding Encoding
        {
            get { return Encoding.UTF8; }
        }
    }

    static void ProcessNodesWithIncludeAttribute(XDocument document, string localName, string includeValue, Action<XElement> action)
    {
        var nodes = document
            .Descendants()
            .Where(p => p.Name.LocalName == localName);

        foreach (var node in nodes)
        {
            var xa = node.Attribute("Include");
            if (xa != null && !string.IsNullOrEmpty(xa.Value) && string.Equals(xa.Value, includeValue))
            {
                action(node);
            }
        }        
    }

    static void RemoveFileFromProject(XDocument document, string fileName)
    {
        ProcessNodesWithIncludeAttribute(document, "None", fileName, element => element.Remove());        
    }

    static void RemoveHintPathFromReference(XDocument document, string assemblyName)
    {
        ProcessNodesWithIncludeAttribute(document, "Reference", assemblyName, element => element.Nodes().Remove());        
    }

    static ProjectFileHook()
    {
        ProjectFilesGenerator.ProjectFileGeneration += (string name, string content) =>
        {
            var document = XDocument.Parse(content);

            RemoveFileFromProject(document, @"Assets\System.Runtime.Serialization.dll");
            RemoveHintPathFromReference(document, "System.Runtime.Serialization.dll");
 
            var str = new Utf8StringWriter();
            document.Save(str);

            return str.ToString();
        };
    }
}