Problem 1.
You may notice that any inputs above your MVC placeholder will work and any form inputs below your MVC placeholder will not POST.The problem is that traditional ASP.NET web forms applications work off the principle of having only one form. MVC does not. However, if you look at the rendered HTML you may notice you have more than one form. ASP.NET will cope with the first form up until the first closing form tag (
</form>
).Solution
Remove all form tags from your MVC pages that are causing the nested forms. This way there will only be one form per page and should therefore POST correctly. Your MVC pages will continue to POST as expected.
Problem 2.
So now your WebForms MasterPage and MVC page performs postbacks wherever there is a submit button as expected. The problem now is that you are going to have to handle that post back within your MVC page.Solution
Make a base Controller class that all Controllers in the solution should inherit for. (I deliberately didn't end the class name with Controller so that MVC doesn't try and use it on its own).
Here is the main part of my ControllerBase:
using System.Web.Mvc; namespace Web.Controllers { public class ControllerBase : Controller { protected override void OnActionExecuting(ActionExecutingContext filterContext) { //if there is a form being posted if (Request.Form != null && Request.Form.Count > 0) { //iterate though all form keys for (var i = 0; i < Request.Form.Count; i++) { //get the value of the form key/value in question var value = Request.Form[i]; //if this is the key/value form pair i want and it is not blank if (Request.Form.Keys[i].EndsWith("txtSiteSearch") && !string.IsNullOrWhiteSpace(value)) { //do something (this redirects to a page with the search value in the query string Response.Redirect("/search/?q=" + value); } } } base.OnActionExecuting(filterContext); } } }
This will run on every request just before the selected ActionMethod is encountered.
I am essentially looking for a particular form field to check if the user typed into the MasterPage's site search text box (with ID="txtSiteSearch") before clicking a form submit button. If they have I send them to the search page with the search text in the querystring.
Obviously, this example is specific to my needs but if you need the form to use a service or other methods, these are all possible too.
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