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On a few minutes I'll be sending a pull-request fixing this issue, and I need a xamarin's bug-id...
This bug was already present on novell's bugzilla reported by someone else (https://bugzilla.novell.com/show_bug.cgi?id=704529). But in the end no one fixed it.
Following is a copy the initial description of the problem, for reference. But for more details you should take a look at novell's stie.
===== ORIGINAL BUG DESCRIPTION =====
Syed Rahman 2011-07-07 22:49:09 UTC
User-Agent: Mozilla/5.0 (Windows NT 6.0; rv:5.0) Gecko/20100101
Using the AllowHtmlAttribute to mark a property on a model so that you can post
html on a form to your controller throws an exception
with the "A potentially dangerous Form value ..."
messasge even though the AllowHtmlAttribute property is for the purpose of not
validating to see if html exists in property.
Steps to Reproduce:
1. Create a model with a property marked with [AllowHtml]
2. Create a controller with both Get and Post action with the model being in
3. Create a view which submits to controller action, with the property being a
textbox, and a button ot submit
4. Fire up the view, put some html in the textbox and post
In step 4, put basic text, submits fine
Should have submitted form to action
Applied the fix.
This is happening in mvc 5.2.3, also it seems there is no way to disable validation