2009-08-05-default-parameter-values-in-openrasta.html

---
layout: post
title: Default parameter values in OpenRasta
date: '2009-08-05T11:57:00.001+01:00'
tags: [openrasta]
modified_time: '2009-08-05T11:57:40.097+01:00'
blogger_id: tag:blogger.com,1999:blog-4015568221071268916.post-6009442443911891723
comments: true
blogger_orig_url: http://serialseb.blogspot.com/2009/08/default-parameter-values-in-openrasta.html
---

<p>So, MVC 2 is innovating by having default values on parameters. I think there’s a lot of value in doing that, and as such <a href="http://www.openrasta.com">OpenRasta</a> has always supported those. Here’s an example.</p>  <div style="border-bottom: silver 1px solid; text-align: left; border-left: silver 1px solid; padding-bottom: 4px; line-height: 12pt; background-color: #f4f4f4; margin: 20px 0px 10px; padding-left: 4px; width: 97.5%; padding-right: 4px; font-family: consolas, &#39;Courier New&#39;, courier, monospace; direction: ltr; font-size: 8pt; border-top: silver 1px solid; cursor: text; border-right: silver 1px solid; padding-top: 4px" id="codeSnippetWrapper">   <div style="border-bottom-style: none; text-align: left; padding-bottom: 0px; line-height: 12pt; border-right-style: none; background-color: #f4f4f4; padding-left: 0px; width: 100%; padding-right: 0px; font-family: consolas, &#39;Courier New&#39;, courier, monospace; direction: ltr; border-top-style: none; color: black; font-size: 8pt; border-left-style: none; overflow: visible; padding-top: 0px" id="codeSnippet">     <pre style="border-bottom-style: none; text-align: left; padding-bottom: 0px; line-height: 12pt; border-right-style: none; background-color: white; margin: 0em; padding-left: 0px; width: 100%; padding-right: 0px; font-family: consolas, &#39;Courier New&#39;, courier, monospace; direction: ltr; border-top-style: none; color: black; font-size: 8pt; border-left-style: none; overflow: visible; padding-top: 0px"><span style="color: #0000ff">public</span> <span style="color: #0000ff">object</span> Search([Optional, DefaultParameterValue(<span style="color: #006080">&quot;*&quot;</span>)]<span style="color: #0000ff">string</span> searchString)</pre>
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    <pre style="border-bottom-style: none; text-align: left; padding-bottom: 0px; line-height: 12pt; border-right-style: none; background-color: #f4f4f4; margin: 0em; padding-left: 0px; width: 100%; padding-right: 0px; font-family: consolas, &#39;Courier New&#39;, courier, monospace; direction: ltr; border-top-style: none; color: black; font-size: 8pt; border-left-style: none; overflow: visible; padding-top: 0px">{</pre>
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    <pre style="border-bottom-style: none; text-align: left; padding-bottom: 0px; line-height: 12pt; border-right-style: none; background-color: white; margin: 0em; padding-left: 0px; width: 100%; padding-right: 0px; font-family: consolas, &#39;Courier New&#39;, courier, monospace; direction: ltr; border-top-style: none; color: black; font-size: 8pt; border-left-style: none; overflow: visible; padding-top: 0px">    <span style="color: #0000ff">return</span> ...;</pre>
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    <pre style="border-bottom-style: none; text-align: left; padding-bottom: 0px; line-height: 12pt; border-right-style: none; background-color: #f4f4f4; margin: 0em; padding-left: 0px; width: 100%; padding-right: 0px; font-family: consolas, &#39;Courier New&#39;, courier, monospace; direction: ltr; border-top-style: none; color: black; font-size: 8pt; border-left-style: none; overflow: visible; padding-top: 0px">}</pre>
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<p>I’m glad the guys at Redmond saw the value in that. The do however use an attribute that wasn’t meant for optional parameter values. At least the way OpenRasta supports it, VB methods with optional parameters and default values work out of the box.</p>