Why does HtmlHelper.GetUnobtrusiveValidationAttributes delete attributes when called?
asp.net, asp.net-mvc
Solution
This is by design. `Html.ViewContext.FormContext` contains a list of the fields that it thinks have been rendered; when you call `GetUnobtrusiveValidationAttributes` the first time it marks your field as rendered, then subsequent calls return an empty collection.
You can set that field as un-rendered by doing this:
Html.ViewContext.FormContext.RenderedField(ViewData.TemplateInfo.GetFullHtmlFieldName(propertyName), false);
Problem
In asp.net MVC I wanted to retrieve validation attributes of certain fields. For this I used HtmlHelper.GetUnobtrusiveValidationAttributes() method. The first time being called, it returns a collection of attributes as expected. However, if called a second time, attributes are empty. example: ``` var attributes = htmlHelper.GetUnobtrusiveValidationAttributes(propertyName); var attributes2 = htmlHelper.GetUnobtrusiveValidationAttributes(propertyName); ``` attributes2 is empty. This is a problem for me because I check validation attributes of fieldB while rendering fieldA but then when fieldB is rendered, attributes are gone. Is this a known behaviour ? Am I missing something ? How can I preserv validation attributes betweeen GetUnobtrusiveValidationAttributes calls ? Thanks in advance