Monthly archives for January, 2011

Domain service extension method

Jan 31, 2011 Leave a Comment ~ Written by Max Schmeling

This little extension method is something I wrote to help cleanup domain context code… just thought I would share:

public static class DomainContextExtensions { public static void Load(this DomainContext domainContext, EntityQuery query, Action<LoadOperation> preprocessCallback, Action<LoadOperation> successCallback, Action<LoadOperation> errorCallback, Action<LoadOperation> postprocessCallback = null) where TEntity : Entity { domainContext.Load(query, load => { if (preprocessCallback != null) preprocessCallback(load); if (load.HasError) { if (errorCallback != null) { errorCallback(load); load.MarkErrorAsHandled(); } } else { successCallback(load); } if (postprocessCallback != null) postprocessCallback(load); }, null); } } }

Enjoy!

Posted in ria-services .net-4 silverlight C#

T4MVC and absolute URLs

Jan 21, 2011 Leave a Comment ~ Written by Max Schmeling

I’ve been using T4MVC for quite some time now, but I’ve just discovered a wonderful feature: the ability to generate absolute URLs using the standard T4MVC strongly typed helpers. It’s extremely simple, compared to doing it the manual way. If you have a controller named AccountController with an action called Login, the following line will return a string with the absolute URL to the login page:

Url.ActionAbsolute(MVC.Account.Login())

I love it!

Posted in t4mvc asp.net-mvc

Getting by without a DataTemplateSelector in Silverlight

Jan 12, 2011 Leave a Comment ~ Written by Max Schmeling

I was working on a Silverlight 4 project with a coworker a few days ago and needed to display a list of objects with different editors based on the type of object. The first thing that came to my mind was to use a DataTemplateSelector. I found out quickly that the Silverlight team – for whatever reason – decided they didn’t want to include a DataTemplateSelector. Frustrated, we turned to Google and found a blog post by Mike Gold that was basically exactly what we needed. I made a few modifications to how he implemented this solution (which I think make it simpler), so I’m posting it here in case it might help someone else.

The idea is to use a custom IValueConverter to convert data templates into content inside of a ContentControl’s Content property. Here is the code for the converter that I used in my sample:

public class CustomerDataTemplateSelectorConverter : IValueConverter { public DataTemplate ActiveCustomerDataTemplate { get; set; } public DataTemplate InactiveCustomerDataTemplate { get; set; } public object Convert(object value, Type targetType, object parameter, CultureInfo culture) { var customer = value as Customer; if (customer != null) { return customer.IsActive ? ActiveCustomerDataTemplate.LoadContent() : InactiveCustomerDataTemplate.LoadContent(); } return null; } public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) { // this method should never be called throw new NotImplementedException(); } }

I’ve put the sample code up on BitBucket: https://bitbucket.org/schmeling88/datatemplateselector-workaround/src

Posted in silverlight .net