MvcHtmlString MVC 2 Conversion Error
I converted my project from MVC 1 to MVC 2 and Visual Studio 2008 gives me the following error:
Error 1 'System.Web.Mvc.MvcHtmlString' does not contain a definition for 'Substring' and no extension method 'Substring' accepting a first argument of type 'System.Web.Mvc.MvcHtmlString' could be found (are you missing a using directive or an assembly reference?) C:\Dev\SapientFansite\SapientFansiteApplication\SapientFansiteWeb\Code\ExtensionMethods\Html.cs 68 75 SapientDevelopment.SapientFansite.Web
Here is the code the error is pointing to. It is specifically having trouble with the "linkHtml.Substring(0, 2)".
var linkHtml = htmlHelper.ActionLink(linkText, actionName, controllerName);
if (isActiveMenuItem) {
linkHtml = string.Format("{0} class=\"active\" {1}", linkHtml.Substring(0, 2), linkHtml.Substring(3))开发者_运维百科;
}
return linkHtml;
}
I suspect that it has something to do with a missing reference or something but I'm at a loss.
Html.ActionLink()
does no longer return a string. It now returns a MvcHtmlString. A MvcHtmlString does not have a method called .Substring()
(only string does). If you call .ToString()
or .ToHtmlString()
(will encode the value) then you will be able to call .Substring()
. See this link.
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