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POMVC Double Encoding MvcHtmlString
 

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    <p><em>Caveat: I have an MVC site as an area in a .Net WebForms site. I'm explaining that in advance in the case that it sheds light on my issue.</em> </p> <p>Now the issue I am having is that I am routing values that could contain special characters like an <code>apostrophe</code> (single quote). If i do not encode the value it routes properly however, my <code>Kendo MVC Grid</code> creates a invalid template when using the unencoded single quote as a filter.</p> <pre><code>http://{base}/{area}/{controller}/{view}?customerName=Justin's%20Instance - Throws Invalid Template Error http://{base}/{area}/{controller}/{view}?customerName=Justin&amp;#39;s%20Instance - No Error </code></pre> <p>So I thought the easiest solution was to properly encode my querystring parameter prior to passing it as a route value. That resulted in a double encoding situation. Then I found out about <code>MvcHtmlString.Create</code> which is specifically designed to tell the routing system not to re-encode the string value. However, it is still double encoding. </p> <pre><code>var customerNameEncoded = MvcHtmlString.Create(HttpUtility.HtmlEncode(model.Name)); var routeResult = RedirectToAction("ManageCustomer", new { customerName = customerNameEncoded }); return routeResult; </code></pre> <p>This is the Url that is created: </p> <pre><code>http://{base/{area}/{controller}/{view}?customerName=Justin%26%2339%3Bs%20Instance </code></pre> <p>As you can see the &#39; is being encoded again. This is throwing the following error. </p> <pre><code>&gt; System.Web.HttpRequestValidationException A potentially dangerous &gt; Request.QueryString value was detected from the client &gt; (customerName="Justin&amp;#39;s Instance"). </code></pre> <p>The <code>web.config</code> for the MVC area has the following tag: <code>validateRequest="false"</code></p> <p>The <code>web.config</code> for the overall website has the following: <code>httpRuntime requestValidationMode="2.0"</code></p> <p>Any ideas as to why this string is being double encoded and how to stop it from doing so?</p>
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    1. USSteve H.
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    1. COIf you are using MVC you should decorate your function with [ValidateInput(false)] .... I am looking at the two links you are saying one throws template error and the other doesn't. However, they look the same. Was this on purpose?
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      1. USBryan Roberts
 

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