mvc – feel my pain – view model is null on postback

I just spent two to three hours because I forgot to put get/set on the public members of my ViewModel.

The “etiology” (symptoms, bad behavior) was that my form posted back but the view model was always null.

Oops!

Correct:
public int logkey { get; set;}
public string logtitle { get; set;}
public string bywhom { get; set;}
public string slogdate { get; set;}
public DateTime logdate { get; set;}
public string logentry { get; set;}

I had been copying some working code, but not this part!

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mixed razor and html (a little beyond the simple examples you find at w3 school)

(sorry about this post all in an image … I’m not skilled enough at word press to format all my bracket characters)

here is what finally worked
we took out as much razor as possible, and now I’m happy. I failed to catch another error in the image of all my travails with this – we got the asp.net system message that echoed to the screen, and the fix for that was to put in a “using” statement … and I could not get this to work in a reasonable amount of time. (less than 4-6 hours) Less razor is a good thing.

    

        
        
@Model.pagingLabelText
        
         
    
    

asp.net mvc – mixing razor code with css

1) vb syntax
2) purpose: hide/show a div from razor (I realize it’s possible to do this easily in jquery)

the page/view:
Html.BeginForm(“results”, “Results” )

@

Html.EndForm()

the css:
.dvPaging {
@Model.NotPaged()
vertical-align:text-top;
width:50%;
height: 20px;
}

the razor code:
I think it’s best to do what we need in a function.
I put presentation layer code in my view model

‘ purpose – called by the css to show or hide the paging section based on whether there are more than
‘ one page or not
Public Function NotPaged() As String
Dim sRet As String = “”
If (Not isPagination) Then sRet = “display:none; height:0px;”
Return sRet
End Function

How to post an html form to mvc

1)     The controller name isCompletionController. The URL of the form action is:

<form action=”http://localhost:36102/Completion/ReceiveCompletionForm” method=”post”>

Note that the url doesn’t contain “Controller”

2)     The controller looks like this:

[HttpPost]
public ActionResult ReceiveCompletionForm(FormCollection collection)
{

3)     I didn’t define a route – this was my default global.asax

routes.MapRoute(
"Default", // Route name
"{controller}/{action}/{id}", // URL with parameters
new { controller = "Home", action = "Index", id = UrlParameter.Optional } // Parameter defaults
);

Note that there is nothing in the route about the FormCollection input to the controller.

mvc redirect to a controller method, uses HttpGet

I honestly don’t know if this post is great or godawful.

What I wanted to do was to have a post method redirect to another method. When you redirect, by definition, you will call the HttpGet version of a method.

What I wanted to do was:

HttpPost to FOO(Complex Object/Hashtable/FormValueCollection), and then at the end of the method, do a return RedirectToAction(“BAR”,object)

HttpGet to BAR(Complex Object/Hashtable/FormValueCollection)

kind of like this: http://stack247.wordpress.com/2011/03/20/get-forms-post-values-in-asp-net-mvc-with-formcollection/

I think it’s not possible.

But what I did get to work was:
HttpPost to FOO(Complex Object/Hashtable/FormValueCollection), and then at the end of the method, do a return RedirectToAction(“BAR”,RouteValueDictionary)

HttpGet to BAR(string param1, string param2, string ccname, string ccamt, string ccstreet, etc spelling out all parameter names in the controller definition)
and I didn’t touch the Routes.

As long as I passed a RouteValueDictionary from the first controller, and specified the names of the parameters I wanted to receive in
the second controller, my method worked.

The methods:

[HttpPost]
public ActionResult VSHcard(Models.VSHcardForm v)
{
try
{
Models.UTKAppRepository objApp = new Models.UTKAppRepository();

payment objP = null;
int iRet = objApp.VSHcardObjectToTouchnetPaymentObjectAndSave(v , ref objP, ref strError);
ViewBag.BillName = “test billname”;
ViewBag.AMT = “1234.56”;

if (iRet < 0)
{
ViewBag.lblError = strError;
}

// return View();
// try redirecting to the get version of the touchnet.create method
RouteValueDictionary dict = new RouteValueDictionary();
System.Collections.Hashtable ht = objP.get_Hashtable();

foreach (string skey in ht.Keys)
{
dict.Add(skey, ht[skey]);
}
//dict.Add(“BILL_NAME”, objP.BILL_NAME);
//dict.Add(“AMT”, objP.AMT);
//dict.Add(“ID”, 2001);

return RedirectToAction(“../Payment/Create”, dict); // HttpGet from Redirect
// we can’t send a hashtable over! return RedirectToAction(“../Payment/Create”, ht); // HttpGet from Redirect
//return RedirectToAction(“../Payment/Create”, new RouteValueDictionary(new { BILL_NAME = objP.BILL_NAME, AMT = objP.AMT })); // HttpGet from Redirect
// return RedirectToAction(“Create”, “Payment”, new RouteValueDictionary(new { BILL_NAME = objP.BILL_NAME, AMT = objP.AMT })); // HttpGet from Redirect
}
catch
{
return View();
}
}

[HttpGet]
public ActionResult Create(int? id,
string BILL_NAME,
int? UPAY_SITE_ID,
string BILL_EMAIL_ADDRESS,
string BILL_STREET1,
string BILL_STREET2,
string BILL_CITY,
string BILL_STATE,
string BILL_POSTAL_CODE,
string BILL_COUNTRY,
string EXT_TRANS_ID,
string EXT_TRANS_ID_LABEL,
decimal? AMT,
string SSV,
string SSV_PROMPT,
string VALIDATION_KEY,
string SUCCESS_LINK,
string SUCCESS_LINK_TEXT,
string ERROR_LINK,
string ERROR_LINK_TEXT,
string CANCEL_LINK,
string CANCEL_LINK_TEXT)
{
ViewBag.Message = “this is the get version of the Create method ” + id.ToString() + BILL_NAME;

// pull data out of the formCollection and put it into ViewData so the View can use it
// ref: http://stack247.wordpress.com/2011/03/20/get-forms-post-values-in-asp-net-mvc-with-formcollection/
//foreach (string _formData in formCollection.Keys)
//{
// ViewBag[_formData] = formCollection[_formData];
//}
ViewBag.BILL_NAME = BILL_NAME;
ViewBag.UPAY_SITE_ID = UPAY_SITE_ID.ToString();
ViewBag.BILL_EMAIL_ADDRESS = BILL_EMAIL_ADDRESS;
ViewBag.BILL_STREET1 = BILL_STREET1;
ViewBag.BILL_STREET2 = BILL_STREET2;
ViewBag.BILL_CITY = BILL_CITY;
ViewBag.BILL_STATE = BILL_STATE;
ViewBag.BILL_POSTAL_CODE = BILL_POSTAL_CODE;
ViewBag.BILL_COUNTRY = BILL_COUNTRY;
ViewBag.EXT_TRANS_ID = EXT_TRANS_ID;
ViewBag.EXT_TRANS_ID_LABEL = EXT_TRANS_ID_LABEL;
ViewBag.AMT = AMT.ToString();
ViewBag.SSV = SSV;
ViewBag.SSV_PROMPT = SSV_PROMPT;
ViewBag.VALIDATION_KEY = VALIDATION_KEY;
ViewBag.SUCCESS_LINK = SUCCESS_LINK;
ViewBag.SUCCESS_LINK_TEXT = SUCCESS_LINK_TEXT;
ViewBag.ERROR_LINK = ERROR_LINK;
ViewBag.ERROR_LINK_TEXT = ERROR_LINK_TEXT;
ViewBag.CANCEL_LINK = CANCEL_LINK;
ViewBag.CANCEL_LINK_TEXT = CANCEL_LINK_TEXT;

return View();

}