Asp.Net MVC ActionLink


Asp.Net MVC ActionLink



Can anyone explain why the following happens? And how to resolve, Visual Studio 2010 and MVC2

<%= Html.ActionLink("Add New Option", "AddOption", "Product", new { @class = "lighbox" }, null)%> 

Results in

/Product/AddOption?class=lightbox

<%= Html.ActionLink("Add New Option", "AddOption", "Product", new { @class = "lighbox" })%> 

Results in

/Product/AddOption?Length=7

Thanks




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You're using these respective overloads:.
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public static MvcHtmlString ActionLink( this HtmlHelper htmlHelper, string linkText, string actionName, string controllerName, Object routeValues, Object htmlAttributes ) 
From: http://msdn.microsoft.com/en-us/library/dd504972.aspx.
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public static MvcHtmlString ActionLink( this HtmlHelper htmlHelper, string linkText, string actionName, Object routeValues, Object htmlAttributes ) 
From: http://msdn.microsoft.com/en-us/library/dd492124.aspx.
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The first new { @class = "lighbox" } is passed as the routeValues argument when it should be the htmlAttributes argument..
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This sort of problem is common with the extension methods used in MVC.


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In can sometimes help to use named arguments (C# 4.0) to make things more readable:.
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<%= Html.ActionLink(linkText: "Add New Option",     actionName: "AddOption",    controllerName: "Product",     htmlAttributes: new { @class = "lighbox" },     routeValues: null)%> 


2:


This is an example of "overload hell" in ASP.NET MVC.. The first code calls the following method:.
public static MvcHtmlString ActionLink(     this HtmlHelper htmlHelper,     string linkText,     string actionName,     string controllerName,     Object routeValues,     Object htmlAttributes ) 
whereas the second code calls this one:.
public static MvcHtmlString ActionLink(     this HtmlHelper htmlHelper,     string linkText,     string actionName,     Object routeValues,     Object htmlAttributes ) 
Notice that the string parameter controllerName in the first call is becoming routeValues in the second one.

The string value "Product" is being passed to the routed values: the string property Length is used, which has a length of 7 here, hence the "Length=7" you're getting in the route.. Considering the first method, it seems that you've swapped the routeValues and htmlAttributes parameters..



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