ASP.NET MVC 5如何在Html.TextBoxFor中删除或添加属性

Question

In my MVC Application View I have @Html.TextBoxFor(m => m.Email, new { @class = "form-control", @readonly = "readonly" })

I need to remove the readonly-attribute when an if-statement occurs in my Controller. How can I, from the Controller, remove the attribute in the View, or add the attribute if I first remove it from the View and then change my if-statement?

Answer 1

I understand that you want to conditionally add the readonly attribute to a textbox.

You may use ViewData for that, from your controller assign ViewData["IsEmailReadOnly"] to a boolean value

if(MyCondition())
    ViewData["IsEmailReadOnly"] = true;
else
    ViewData["IsEmailReadOnly"] = false;

And then inside your View:

@{
    object textBoxAttrs;
    if((bool) ViewData["IsEmailReadOnly"]) {
        textBoxAttrs = new { @class = "form-control", @readonly = "readonly" };
    }
    else
    {
        textBoxAttrs = new { @class = "form-control" };
    }
}

@Html.TextBoxFor(m => m.Email, textBoxAttrs)