CODEWITHSUNDEEP
asp.net-mvc
Igor Okorokov
Igor Okorokov

Reputation: 943

Define editor template that makes use of ModelState

Please help me to implement the editor template when Model and ModelState mismatch.

For example: Model.A == 'x', ViewData.ModelState['A'] == 'y'.

That can occur when form was posted invalid.

Native templates take this in account and display right value from the ModelState. But i could't find their sources.

I need to implement this in my own temlate. Should i just check for a present value in ModelState and use it if it is set. Or may you suggest a better way?

Upvotes: 1

Views: 166

Answers (1)

kloarubeek
kloarubeek

Reputation: 2844

I had a look at the HtmlHelpers (editors) and came up with this. In the example the model/ value is an integer:

var value = Model; //value according to the model
var fieldName = ViewData.TemplateInfo.GetFullHtmlFieldName("");
ModelState modelState;
if(ViewData.ModelState.TryGetValue(fieldName, out modelState) && modelState.Value != null)
{
    value = (int?) modelState.Value.ConvertTo(typeof(int?), null);
}

Now the value contains the model value or the posted ModelState value (the attemptedValue).

Upvotes: 1

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