How can I get all element values from Request Form without specifying exactly which one with GetValues ElementIdName

Question

Currently using the below code to create a string array  elements  that contains all string values from Request Form GetValues  quot ElementIdName quot    the problem is that in order for this to work all my dropdown lists in my View have to have the same element ID name which I don t want them to for obvious reasons  So I am wondering if there s any way for me to get all the string values from Request Form without explicitly specifying the element name  Ideally I would want to get all dropdown list values only  I am not too hot in C  but isn t there some way to get all element ID s starting with say  quot List quot     quot    quot   so I could name my lists List1  List2  List3 etc  Thanks    HttpPost  public ActionResult OrderProcessor         string   elements      elements   Request Form GetValues  quot List quot         int   pidarray   new int elements Length          Convert all string values in elements into int and assign to pidarray     for  int x   0  x  lt  elements Length  x                   pidarray x    Convert ToInt32 elements x  ToString                   This is the other alternative  painful way which I don t want use         int id1   int Parse Request Form  quot List1 quot           int id2   int Parse Request Form  quot List2 quot            List lt int gt  pidlist   new List lt int gt           pidlist Add id1         pidlist Add id2        var order   new Order         foreach  var productId in pidarray                var orderdetails   new OrderDetail             orderdetails ProductID   productId          order OrderDetails Add orderdetails           order OrderDate   DateTime Now             context Orders AddObject order       context SaveChanges        return View order

User · Accepted Answer

You can get all keys in the Request Form and then compare and get your desired values   Your method body will look like this  -  List lt int gt  listValues   new List lt int gt     foreach  string key in Request Form AllKeys        if  key StartsWith  List                  listValues Add Convert ToInt32 Request Form key

User · Answer

Here is a way to do it without adding an ID to the form elements    lt form method  post  gt               lt select name  List  gt           lt option value  1  gt Test1 lt  option gt           lt option value  2  gt Test2 lt  option gt       lt  select gt       lt select name  List  gt           lt option value  3  gt Test3 lt  option gt           lt option value  4  gt Test4 lt  option gt       lt  select gt           lt  form gt   public ActionResult OrderProcessor         string   ids   Request Form GetValues  List        Then ids will contain all the selected option values from the select lists  Also  you could go down the Model Binder route like so   public class OrderModel       public string   List   get  set       public ActionResult OrderProcessor OrderModel model        string   ids   model List      Hope this helps

User · Answer

Waqas Raja s answer with some LINQ lambda fun   List lt int gt  listValues   new List lt int gt     Request Form AllKeys      Where n   gt  n StartsWith  List         ToList        ForEach x   gt  listValues Add int Parse Request Form x

User · Answer

Request Form is a NameValueCollection  In NameValueCollection you can find the GetAllValues   method   By the way the LINQ method also works

[c#] How can I get all element values from Request.Form without specifying exactly which one with .GetValues("ElementIdName")

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