Can I loop through a Collection.Request.Form?

I have some checkboxes with a unique id. is it possible to find all the checkbox+uniquenum in a form collection?

something l开发者_StackOverflow社区ike -

foreach (var item in Collection.Request.Form["checkbox" + with UniqueIDNum])
{
    //code
}

No.

Instead, you can loop through all of the keys, and check whether they start with checkbox.

For example:

foreach(string key in Request.Form) {
    if (!key.StartsWith("checkbox")) continue;
    ...
}

The NameValueCollection enumerator returns keys as strings.

Or something like that

var checkBoxes = Request.Form.Keys.Where(rs=>rs.StartsWith("dummy"));
foreach(string key in checkBoxes){
 // Your code
}

You should be able to do this with Linq (this should work, haven't tested): I'm assuming also that the ID of the checkboxes is "checkbox[ID]". BTW, duplicate ID's in form fields is bad bad bad.

var checkboxes = (from key in Request.Form.AllKeys where key = "checkbox" + UniqueIDNum)
foreach(string key in checkboxes)
{
     //do stuff
}

        [AcceptVerbs(HttpVerbs.Post)]
        public ActionResult Index(FormCollection fc)
        {   
            string a = fc["hdn_1"].ToString(); // if you know for sure that it will have a value.
            string lbl_1 = null;

            foreach (var key in fc.AllKeys)
            {
                if (key.Contains("txt_1"))
                {
                    lbl_1 = fc["txt_1"].ToString();
                }
            }
         }

Hope this helps.

I had to do this in VB.NET, after having not worked with VB.NET in years and even then not having worked with it much, and I used Josh Wolf's answer to get the following:

Dim checkedOrders As IEnumerable(Of String) = From key In Request.Form.AllKeys Where key.StartsWith("chk")

If checkedOrders.Count > 0 Then
   ' do stuff, loop through checkedOrders, etc
End If

Note that my checkboxes all start with "chk" in the name (e.g. "chk1038", "chk1040", etc).