Not able to access GetModelStateValue in custom control in asp.net mvc2

问题

I am trying to write a custom control for text box control where in would like to generate the control based on some input attributes , I am not able to access GetModelStateValue in my custom control.

How do i do this ?

回答1:

You won't be able to access it as that method is marked as an internal method. The best you can do is just duplicate the MVC source code and place that method somewhere where you can access it. You can use the following. Note you will need to pass in the htmlHelper object to access the ViewData.

static object GetModelStateValue(HtmlHelper htmlHelper, string key, Type destinationType)
{
    ModelState modelState;
    if (htmlHelper.ViewData.ModelState.TryGetValue(key, out modelState))
    {
        if (modelState.Value != null)
        {
            return modelState.Value.ConvertTo(destinationType, null /* culture */);
        }
    }
    return null;
}

来源：https://stackoverflow.com/questions/6967148/not-able-to-access-getmodelstatevalue-in-custom-control-in-asp-net-mvc2