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POHow do I properly use .NET Data Annotations for data validation in WPF with a WCF backend?
 

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  1. POHow do I properly use .NET Data Annotations for data validation in WPF with a WCF backend?
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    <p>Question title pretty much explains what I am trying to do.</p> <p>Simplification of my code for example purpose:</p> <p>Bits of an example WCF Service:</p> <pre><code> pulic class Restaurant { //RegEx to only allow alpha characters with a max length of 40 //Pardon if my regex is slightly off [RegularExpression(@"^[a-zA-Z''-'\s]{1,40}$")] public string Name { get; set; } } public class RestaurantService { List&lt;Restaurant&gt; restaurants = new List&lt;Restaurant&gt;(); public AddRestaurant(string name) { Restaurant restaurant = new Restaurant(); restaurant.Name = name; restaurants.Add(restaurant); } } </code></pre> <p>Bits of example XAML:</p> <pre><code> &lt;TextBox name="txt1" Text="{Binding Restaurant.Name, ValidatesOnDataErrors=True}"/&gt; </code></pre> <p>How do I make my view do something when my data annotation is violated?</p> <p>All of the examples I can find here and elsewhere are either not exactly what I am looking for or that have to do with ASP.NET. I don't know enough about WPF and Data Annotations and I am very green with WCF.</p> <p>I have tried implementing the IDataErrorInfo interface, but I can't seem to get anything to fire in it. I found this code in another different question on StackOverflow. I implemented this in my Restaurant class in the WCF service.</p> <pre><code> public string this[string columnName] { get { if (columnName == "Name") { return ValidateProperty(this.Name, columnName); } return null; } } protected string ValidateProperty(object value, string propertyName) { var info = this.GetType().GetProperty(propertyName); IEnumerable&lt;string&gt; errorInfos = (from va in info.GetCustomAttributes(true).OfType&lt;ValidationAttribute&gt;() where !va.IsValid(value) select va.FormatErrorMessage(string.Empty)).ToList(); if (errorInfos.Count() &gt; 0) { return errorInfos.FirstOrDefault&lt;string&gt;(); } return null; } </code></pre>
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