authorize.net error code 128 Advanced view techniques in Visual Studio .NET

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Advanced view techniques
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and calling the View helper method E. To ensure that this action can only be rendered as a child action and not through an external request, we decorate our child action with the ChildActionOnly attribute B. The only difference between a normal controller action and a child action is the ChildActionOnly attribute. Otherwise, our controller still gets instantiated through the controller factory, all action filters are executed, and the expected view is displayed using the normal mechanism for locating views. For child actions, we typically use a ViewUserControl for the view, because master pages usually don t apply in child action scenarios. In the next section, we ll examine how we can efficiently build parameter lists without resorting to anonymous objects or ugly dictionary syntax.
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10.2 Building query-string parameter lists
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You ll often find yourself preparing query-string parameter lists when developing MVC views. In this section, you ll learn how to build new URLs complete with query-string parameters. The controller action for this example is simple, with only one parameter, as shown in listing 10.6.
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Listing 10.6 The Edit profile action
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public ViewResult Edit(string username) { var profile = _profileRepository.Find(username); return View(new EditProfileInput(profile)); }
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Listing 10.6 shows an action method that accepts a username and sends a view model to the default view. There are two options for building parameter lists in ASP.NET MVC: we can construct a RouteValueDictionary or an anonymous type, both of which are shown in listing 10.7.
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Listing 10.7 Current options for building route-based URLs
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<%=Html.ActionLink("Edit", "Edit", new RouteValueDictionary(new Dictionary<string, object> { {"username", Model.Username } } )) %> <%=Html.ActionLink("Edit", "Edit", new { username = Model.Username }) %>
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The first option, using the RouteValueDictionary, is quite ugly. It takes dozens of characters before you find that you re trying to specify the username option. The second option is shorter but much less intuitive. The signature of that ActionLink overload accepts a parameter named routeValues but only of type object. It s up to the developer to determine when these overloads accepting object parameters are workarounds for the lack of decent dictionary initializer syntax in C#.
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Building query-string parameter lists
Internally, the ActionLink method uses reflection to find the properties and values defined in the anonymous type. The ActionLink method then builds a dictionary from the properties defined and their values. The property names become route value keys, and the property values become the route values. This works well as long as we already understand that the object overloads are using reflection to generate a dictionary. But this doesn t address the duplication that this method introduces. For every link to a common action, we need to supply the names of the action parameters. If these values are scattered across many views, it can be difficult or impossible to change the parameter name in an action method. In our Edit action, for example, we might want to change the parameter name to name, causing us to search through our views and controllers to find places where we link to that action. To address this duplication, we have two options. Our first option is to create strongly typed models for every action method that accepts parameters. The second is to encapsulate the building of parameter lists into a builder object. We could then use this parameter builder to build parameter lists in our views and controller actions. Typically, putting structure around query-string parameters is preferable, because it will help prevent typo bugs. First, we need to create our parameter builder object, as shown in listing 10.8.
Listing 10.8 The ParamBuilder object
public class ParamBuilder : ExplicitFacadeDictionary<string, object> { private readonly IDictionary<string, object> _params = new Dictionary<string, object>(); protected override IDictionary<string, object> Wrapped { get { return _params; } } public static implicit operator RouteValueDictionary( ParamBuilder paramBuilder) { return new RouteValueDictionary(paramBuilder); } public ParamBuilder Username(string value) { _params.Add("username", value); return this; } }
Our ParamBuilder class inherits from a special dictionary class, ExplicitFacadeDictionary. This class is an implementation of IDictionary<,>, where every method is explicitly implemented to ensure that users of the ParamBuilder don t get bombarded with a multitude of dictionary methods. The abstract ExplicitFacadeDictionary class needs implementers to provide the wrapped dictionary object in the Wrapped property.
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