ASP.NET MVC DropDownList ... What am I doing wrong?

[shapper]

Hello,

I am trying to display a DropDownList on an ASP.NET MVC view.

SlidePaper.Targ ets contains the list of items and
SlidePaper.Slid e.Target contains the current value taken from the
database for the given record ...

This works but does not give the current value, only the list:
<%= Html.DropDownLi st(null, "Targets") %.

Then do display the list and the current value I tried the following:
<%= Html.DropDownLi st(null, (string)ViewDat a["Target"] ??
ViewData.Model. SlidePaper.Slid e.Target.ToStri ng(),
(SelectList)Vie wData["Targets"])%>

It gives an error:

Value cannot be null.
Parameter name: selectList
Use the "new" keyword to create an object instance

I don't know how to solve this. Could someone, please, help me out?

On my controller I have:

public ActionResult Create() {
SlideViewData viewData = new SlideViewData() ;
viewData.Target s = Asset.Targets() ;
viewData.SlideP aper.Slide.Targ et = "_blank";
return View("Create", viewData);
}

I am testing this on my Create view but as you can see I am defining
Targets and Target.

Asset.Targets is:

public static SelectList Targets() {
var targets = new Dictionary<stri ng, string>();
targets.Add("Bl ank", "_blank");
targets.Add("Pa rent", "_parent");
targets.Add("Se lf", "_self");
targets.Add("To p", "_top");
var list = new SelectList(targ ets, "Value", "Key");
return list;
}

Thank You,

Miguel

<%= Html.DropDownLi st(null, "Targets") %>
change to
<%= Html.DropDownLi st("", "Targets") %.

"shapper" <md*****@gmail. com写入消�
news:05******** *************** ***********@b1g 2000hsg.googleg roups.com...

Hello,

I am trying to display a DropDownList on an ASP.NET MVC view.

SlidePaper.Targ ets contains the list of items and
SlidePaper.Slid e.Target contains the current value taken from the
database for the given record ...

This works but does not give the current value, only the list:
<%= Html.DropDownLi st(null, "Targets") %.

Then do display the list and the current value I tried the following:
<%= Html.DropDownLi st(null, (string)ViewDat a["Target"] ??
ViewData.Model. SlidePaper.Slid e.Target.ToStri ng(),
(SelectList)Vie wData["Targets"])%>

It gives an error:

Value cannot be null.
Parameter name: selectList
Use the "new" keyword to create an object instance

I don't know how to solve this. Could someone, please, help me out?

On my controller I have:

public ActionResult Create() {
SlideViewData viewData = new SlideViewData() ;
viewData.Target s = Asset.Targets() ;
viewData.SlideP aper.Slide.Targ et = "_blank";
return View("Create", viewData);
}

I am testing this on my Create view but as you can see I am defining
Targets and Target.

Asset.Targets is:

public static SelectList Targets() {
var targets = new Dictionary<stri ng, string>();
targets.Add("Bl ank", "_blank");
targets.Add("Pa rent", "_parent");
targets.Add("Se lf", "_self");
targets.Add("To p", "_top");
var list = new SelectList(targ ets, "Value", "Key");
return list;
}

Thank You,

Miguel