Kullanıdığım tasarımda bool ve bazı int değerleri Evet Hayır  radiobutton ile belirli bir formatta göstermek istiyordum. göstermek istiyordum. ancak model dynamic olunca farklı cozum almam gerekti. Yazım: https://mahmutgundogdu.wordpress.com/2017/07/13/asp-net-mvc-editor-template-ile-custom-radio-button-group-yapimi

CustomRadioButtonForHelper.cs

        /// <summary>
        /// Kaynak:https://stackoverflow.com/a/23383159/3928982
        /// </summary>

        public static MvcHtmlString RadioButtonFor<TModel, TValue>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TValue>> expression, object value, object htmlAttributes, bool checkedState)
        {
            var htmlAttributeDictionary = HtmlHelper.AnonymousObjectToHtmlAttributes(htmlAttributes);

            if (checkedState)
            {
                htmlAttributeDictionary.Add("checked", "checked");
            }

            return htmlHelper.RadioButtonFor(expression, value, htmlAttributeDictionary);
        }

RadioYesNo.cshtml

@model dynamic

@if (Model is bool || Model is bool?)
{
    <div class="mt-radio-inline">
        <label class="mt-radio mt-radio-outline">
            Evet
            @Html.RadioButtonFor(model => model, true, ViewData["HtmlAttributes"], (bool?)Model == true)
            <span></span>
        </label>
        <label class="mt-radio mt-radio-outline">
            Hayır
            @Html.RadioButtonFor(model => model, false, ViewData["HtmlAttributes"], (bool?)Model == false)
            <span></span>
        </label>
    </div>
}
else
{
    <div class="mt-radio-inline">
        <label class="mt-radio mt-radio-outline">
            Evet
            @Html.RadioButtonFor(model => model, 1, ViewData["HtmlAttributes"])
            <span></span>
        </label>
        <label class="mt-radio mt-radio-outline">
            Hayır
            @Html.RadioButtonFor(model => model, 0, ViewData["HtmlAttributes"])
            <span></span>
        </label>
    </div>
}
@Html.ValidationMessageFor(model => model, "", new { @class = "text-danger" })

RadioYesNoOld.cshtml

@model bool?
<div class="mt-radio-inline">
    <label class="mt-radio mt-radio-outline">
        Evet
        @Html.RadioButtonFor(model => model, true, ViewData["HtmlAttributes"])
        <span></span>
    </label>
    <label class="mt-radio mt-radio-outline">
        Hayır
        @Html.RadioButtonFor(model => model, false, ViewData["HtmlAttributes"])
        <span></span>
    </label>
</div>
@Html.ValidationMessageFor(model => model, "", new { @class = "text-danger" })