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	<title>JAPF &#187; CodeProject</title>
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	<description>Jeremy Alles Presentation Foundation: WPF, Silverlight, Windows Phone 7, Windows 8</description>
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		<title>Attributes-based validation in a WPF MVVM application</title>
		<link>http://www.japf.fr/2010/07/attributes-based-validation-in-a-wpf-mvvm-application/</link>
		<comments>http://www.japf.fr/2010/07/attributes-based-validation-in-a-wpf-mvvm-application/#comments</comments>
		<pubDate>Thu, 29 Jul 2010 07:29:32 +0000</pubDate>
		<dc:creator>Jeremy</dc:creator>
				<category><![CDATA[.Net]]></category>
		<category><![CDATA[CodeProject]]></category>
		<category><![CDATA[WPF]]></category>
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		<category><![CDATA[mvvm]]></category>
		<category><![CDATA[validation]]></category>

		<guid isPermaLink="false">http://www.japf.fr/?p=630</guid>
		<description><![CDATA[Today, I&#8217;m proud to share with you my very first article available on CodeProject. This article presents a technique which can be used in order to add validation in a WPF MVVM application based on attribute. Basically, it means that you can write validation logic like that (notice the attribute associated to this property): ?View [...]]]></description>
			<content:encoded><![CDATA[<p>Today, I&#8217;m proud to share with you my very first article available on <a href="http://www.codeproject.com/KB/smart/WPF_Validation_Attribute.aspx">CodeProject</a>. This article presents a technique which can be used in order to add validation in a WPF MVVM application based on attribute. Basically, it means that you can write validation logic like that (notice the attribute associated to this property):</p>

<div class="wp_codebox_msgheader"><span class="right"><sup><a href="http://www.ericbess.com/ericblog/2008/03/03/wp-codebox/#examples" target="_blank" title="WP-CodeBox HowTo?"><span style="color: #99cc00">?</span></a></sup></span><span class="left"><a href="javascript:;" onclick="javascript:showCodeTxt('p630code2'); return false;">View Code</a> CSHARP</span><div class="codebox_clear"></div></div><div class="wp_codebox"><table><tr id="p6302"><td class="line_numbers"><pre>1
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</pre></td><td class="code" id="p630code2"><pre class="csharp" style="font-family:monospace;"><span style="color: #008000;">&#91;</span>Required<span style="color: #008000;">&#40;</span>ErrorMessage <span style="color: #008000;">=</span> <span style="color: #666666;">&quot;Field 'FirstName' is required.&quot;</span><span style="color: #008000;">&#41;</span><span style="color: #008000;">&#93;</span>
<span style="color: #0600FF; font-weight: bold;">public</span> <span style="color: #6666cc; font-weight: bold;">string</span> FirstName
<span style="color: #008000;">&#123;</span>
    get
    <span style="color: #008000;">&#123;</span>
        <span style="color: #0600FF; font-weight: bold;">return</span> <span style="color: #0600FF; font-weight: bold;">this</span><span style="color: #008000;">.</span><span style="color: #0000FF;">firstName</span><span style="color: #008000;">;</span>
    <span style="color: #008000;">&#125;</span>
    set
    <span style="color: #008000;">&#123;</span>
        <span style="color: #0600FF; font-weight: bold;">this</span><span style="color: #008000;">.</span><span style="color: #0000FF;">firstName</span> <span style="color: #008000;">=</span> value<span style="color: #008000;">;</span>
        <span style="color: #0600FF; font-weight: bold;">this</span><span style="color: #008000;">.</span><span style="color: #0000FF;">OnPropertyChanged</span><span style="color: #008000;">&#40;</span><span style="color: #666666;">&quot;FirstName&quot;</span><span style="color: #008000;">&#41;</span><span style="color: #008000;">;</span>
    <span style="color: #008000;">&#125;</span>
<span style="color: #008000;">&#125;</span></pre></td></tr></table></div>

<p>Of course the article comes with a nice demo application:</p>
<p><a href="http://www.japf.fr/wp-content/uploads/2010/07/02.png" rel="lightbox[630]"><img class="alignnone size-full wp-image-631" title="02" src="http://www.japf.fr/wp-content/uploads/2010/07/02.png" alt="" width="411" height="160" /></a></p>
<p>You can read the full article here: <a href="http://www.codeproject.com/KB/smart/WPF_Validation_Attribute.aspx">Attributes-based validation in a WPF MVVM application</a></p>
<p><em><br />
</em></p>
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