aspnet razor editorfor conditionally add attribute

Question

I'm using the following approach to create form controls:

@Html.DropDownList("FK_CompID", null, htmlAttributes: new { @class = "form-control", @readonly = "readonly"})

but when I need to make it conditionally whether it be read only or not I shall remove that attribute,

Is there any way to handle it like this:

@Html.DropDownList("FK_CompID", null, htmlAttributes: new { @class = "form-control", @readonly = null})

and should be not added to element?

Answer 1

You need to build an object defining the html attributes based on some property and then use that in the DropDownList() method. Assuming you model contains a property bool IsReadOnly, then

@{
    var attributes = Model.IsReadOnly ? 
    (object)new { @class = "form-control", readonly = "readonly" } :
    (object)new { @class = "form-control"};
}
@Html.DropDownList("FK_CompID", null, attributes)