public static MvcHtmlString EnumDropDownListFor <TModel, TEnum>(this HtmlHelper <TModel> htmlHelper, Expression <Func <TModel, TEnum> > expression, IDictionary <string, object> htmlAttributes) where TEnum : struct
{
ModelMetadata metadata = ModelMetadata.FromLambdaExpression(expression, htmlHelper.ViewData);
Type enumType = HtmlExtensions.GetNonNullableModelType(metadata);
StringBuilder buffter = new StringBuilder("");
if (metadata.IsNullableValueType)
{
buffter.AppendFormat("\n<option value=\"\" selected=\"selected\">请选择...</option>");
}
Enum.GetValues(enumType).Cast <TEnum>().ToList().ForEach(p =>
buffter.AppendFormat("\n<option value=\"{0}\"{2}>{1}</option>",
Convert.ToInt32(p).ToString(),
HtmlExtensions.EnumDescriptionFor(p),
p.Equals(metadata.Model) ? " selected=\"selected\"" : ""
)
);
TagBuilder tagBuilder = new TagBuilder("select")
{
InnerHtml = buffter.ToString()
};
tagBuilder.MergeAttributes <string, object>(htmlAttributes);
tagBuilder.GenerateId(metadata.PropertyName);
tagBuilder.MergeAttribute("name", metadata.PropertyName, true);
return(new MvcHtmlString(tagBuilder.ToString()));
}
/// <summary>
/// 使用强类型方式创建input type="checkbox"标签
/// wangyp
/// 2014-12-16
/// </summary>
/// <typeparam name="TModel"></typeparam>
/// <typeparam name="TEnum"></typeparam>
/// <param name="htmlHelper"></param>
/// <param name="expression"></param>
/// <param name="htmlAttributes"></param>
/// <returns></returns>
public static MvcHtmlString EnumCheckBoxListFor <TModel, TEnum>(this HtmlHelper <TModel> htmlHelper, Expression <Func <TModel, TEnum> > expression, IDictionary <string, object> htmlAttributes) where TEnum : class
{
ModelMetadata metadata = ModelMetadata.FromLambdaExpression(expression, htmlHelper.ViewData);
Type enumType = HtmlExtensions.GetNonNullableModelType(metadata);
if (!enumType.IsArray || !metadata.ModelType.IsArray)
{
throw new Exception("Model的属性必须为数组类型");
}
enumType = enumType.GetElementType();
if (!enumType.IsEnum)
{
throw new Exception("Model的属性必须为枚举类型的数组类型");
}
int[] models = (int[])metadata.Model;
StringBuilder buffter = new StringBuilder();
Array enums = Enum.GetValues(enumType);
foreach (Enum p in enums)
{
TagBuilder tagBuilder = new TagBuilder("input");
tagBuilder.GenerateId(metadata.PropertyName + p.GetValue().ToString());
tagBuilder.MergeAttributes <string, object>(htmlAttributes);
tagBuilder.MergeAttribute("name", metadata.PropertyName, true);
tagBuilder.MergeAttribute("type", "checkbox");
tagBuilder.MergeAttribute("value", p.GetValue().ToString());
if (models.Contains(p.GetValue()))
{
tagBuilder.MergeAttribute("checked", "checked");
}
buffter.AppendFormat("<label>" + tagBuilder.ToString() + p.GetName() + "</label>");
}
Array.Clear(models, 0, models.Length);
models = null;
return(new MvcHtmlString(buffter.ToString()));
}
/// <summary>
/// 使用强类型方式创建input type="radio"标签
/// @this.Html.EnumRadioButtonListFor(p => p.Render)
/// wangyp
/// 2014-12-16
/// </summary>
/// <typeparam name="TModel"></typeparam>
/// <typeparam name="TEnum"></typeparam>
/// <param name="htmlHelper"></param>
/// <param name="expression"></param>
/// <param name="htmlAttributes"></param>
/// <returns></returns>
public static MvcHtmlString EnumRadioButtonListFor <TModel, TEnum>(this HtmlHelper <TModel> htmlHelper, Expression <Func <TModel, TEnum> > expression, IDictionary <string, object> htmlAttributes) where TEnum : struct
{
ModelMetadata metadata = ModelMetadata.FromLambdaExpression(expression, htmlHelper.ViewData);
Type enumType = HtmlExtensions.GetNonNullableModelType(metadata);
StringBuilder buffter = new StringBuilder();
Array enums = Enum.GetValues(enumType);
foreach (Enum p in enums)
{
TagBuilder tagBuilder = new TagBuilder("input");
tagBuilder.GenerateId(metadata.PropertyName + p.GetValue().ToString());
tagBuilder.MergeAttributes <string, object>(htmlAttributes);
tagBuilder.MergeAttribute("name", metadata.PropertyName, true);
tagBuilder.MergeAttribute("type", "radio");
tagBuilder.MergeAttribute("value", p.GetValue().ToString());
if (p.Equals(metadata.Model))
{
tagBuilder.MergeAttribute("checked", "checked");
}
buffter.AppendFormat("<label>" + tagBuilder.ToString() + p.GetName() + "</label>");
}
return(new MvcHtmlString(buffter.ToString()));
}