MVC 3 edit view for certain fields only - asp.net-mvc-3

Question

I have this model:
public class ExchangeRate
{
[Key]
public int ExchangeRateID { get; set; }
[Required]
[Display(Name = "Currency:")]
public string Currency { get; set; }
[Required]
public decimal Rate { get; set; }
}
The "Create" view is working fine, but when I am in the edit view, I only want the Currency property to be displayed, and not editable. How should I do this? If I create another "view-only" model for this class, then I would omit the "Currency" property and would not be able to display it.
#using (Html.BeginForm()) {
#Html.ValidationSummary(true)
<fieldset>
<legend>ExchangeRate</legend>
#Html.HiddenFor(model => model.ExchangeRateID)
<div class="editor-label">
#Html.LabelFor(model => model.Currency)
</div>
<div class="editor-field">
#Html.DisplayFor(model => model.Currency)
</div>
<div class="editor-label">
#Html.LabelFor(model => model.Rate)
</div>
<div class="editor-field">
#Html.EditorFor(model => model.Rate)
#Html.ValidationMessageFor(model => model.Rate)
</div>
<p>
<input type="submit" value="Save" />
</p>
</fieldset>
}
Changing #Html.EditorFor(model => model.Currency) to #Html.DisplayFor(model => model.Currency) doesn't work because the model state becomes invalid when it posts back to the controller.

Answer 1

You could add
#Html.HiddenFor(model => model.Currency)
in your form and then use
#Html.DisplayFor(model=> model.Currency)
to display the readonly value of the currency property. That way when you post the value will be sent along in the posted model.

Answer 2

You're looking for:
[HiddenInput(DisplayValue=true)]
Then show the editor, not the display (use EditorFor).
This displays the value read-only, but adds a hidden input so that the posted state is valid.

Answer 3

To display the currency but not edit it try
#Html.Label("Currency", Model.Currency)
if you also need to post the currency value back to the controller try
#Html.HiddenFor(m => m.Currency)
I hope this helps.