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    copied!<p>For me the whole point of using MVVM Light is to avoid injecting anything into the constructor of a View Model. MVVM Light provides a Messaging facility that allows you to send your parameters to a listener registered <em>inside</em> of the View Model.</p> <p>For example, this is my View Model from my <a href="http://wordwalkingstick.codeplex.com/" rel="nofollow">WordWalkingStick</a> project using VSTO and WPF:</p> <pre><code>using System; using System.Xml.Linq; using GalaSoft.MvvmLight.Messaging; namespace Songhay.Wpf.WordWalkingStick.ViewModels { using Songhay.Office2010.Word; using Songhay.OpenXml; using Songhay.OpenXml.Models; using Songhay.Wpf.Mvvm; using Songhay.Wpf.Mvvm.ViewModels; /// &lt;summary&gt; /// View Model for the default Client /// &lt;/summary&gt; public class ClientViewModel : ViewModelBase { /// &lt;summary&gt; /// Initializes a new instance of the &lt;see cref="ClientViewModel"/&gt; class. /// &lt;/summary&gt; public ClientViewModel() { if(base.IsInDesignMode) { #region this._flatOpcSourceString = ApplicationUtility .LoadResource( new Uri("/Songhay.Wpf.WordWalkingStick;component/PackedFiles/FlatOpcToHtml.xml", UriKind.Relative)); this._xhtmlSourceString = ApplicationUtility .LoadResource( new Uri("/Songhay.Wpf.WordWalkingStick;component/PackedFiles/FlatOpcToHtml.html", UriKind.Relative)); #endregion } else { this._flatOpcSourceString = "Loading…"; this._xhtmlSourceString = "Loading…"; //Receive MvvmLight message: Messenger.Default.Register(this, new Action&lt;GenericMessage&lt;TransformationMessage&gt;&gt;( message =&gt; { var tempDocFolder = Environment.ExpandEnvironmentVariables("%UserProfile%/Desktop/"); var inputPath = tempDocFolder + "temp.docx"; var outputPath = tempDocFolder + "temp.html"; var flatOpcDoc = XDocument.Parse(message.Content.TransformationResult); OpenXmlUtility.TransformFlatToOpc(flatOpcDoc, inputPath); this.FlatOpcSourceString = flatOpcDoc.Root.ToString(); var settings = new SonghayHtmlConverterSettings() { PageTitle = "My Page Title " + DateTime.Now.ToString("U"), UseEntityMap = false }; OpenXmlUtility.WriteHtmlFile(inputPath, outputPath, settings); var xhtmlDoc = XDocument.Load(outputPath); this.XhtmlSourceString = xhtmlDoc.Root.ToString(); })); } } /// &lt;summary&gt; /// Gets or sets the flat opc source string. /// &lt;/summary&gt; /// &lt;value&gt;The flat opc source string.&lt;/value&gt; public string FlatOpcSourceString { get { return _flatOpcSourceString; } set { _flatOpcSourceString = value; base.RaisePropertyChanged("FlatOpcSourceString"); } } /// &lt;summary&gt; /// Gets or sets the XHTML source string. /// &lt;/summary&gt; /// &lt;value&gt;The XHTML source string.&lt;/value&gt; public string XhtmlSourceString { get { return _xhtmlSourceString; } set { _xhtmlSourceString = value; base.RaisePropertyChanged("XhtmlSourceString"); } } string _flatOpcSourceString; string _xhtmlSourceString; } } </code></pre> <p>You can see that MVVM Light is <em>messaging</em> (not injecting) values into the constructor (<code>Messenger.Default.Register</code>) with its <code>Messenger</code>.</p>
 

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