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/* ****************************************************************************
*
* Copyright (c) Microsoft Corporation. All rights reserved.
*
* This software is subject to the Microsoft Public License (Ms-PL).
* A copy of the license can be found in the license.htm file included
* in this distribution.
*
* You must not remove this notice, or any other, from this software.
*
* ***************************************************************************/
namespace System.Web.Mvc.Html {
using System;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using System.Linq.Expressions;
public static class LabelExtensions {
public static MvcHtmlString Label(this HtmlHelper html, string expression) {
return LabelHelper(html,
ModelMetadata.FromStringExpression(expression, html.ViewData),
expression);
}
[SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures", Justification = "This is an appropriate nesting of generic types")]
public static MvcHtmlString LabelFor<TModel, TValue>(this HtmlHelper<TModel> html, Expression<Func<TModel, TValue>> expression) {
return LabelHelper(html,
ModelMetadata.FromLambdaExpression(expression, html.ViewData),
ExpressionHelper.GetExpressionText(expression));
}
public static MvcHtmlString LabelForModel(this HtmlHelper html) {
return LabelHelper(html, html.ViewData.ModelMetadata, String.Empty);
}
internal static MvcHtmlString LabelHelper(HtmlHelper html, ModelMetadata metadata, string htmlFieldName) {
string labelText = metadata.DisplayName ?? metadata.PropertyName ?? htmlFieldName.Split('.').Last();
if (String.IsNullOrEmpty(labelText)) {
return MvcHtmlString.Empty;
}
TagBuilder tag = new TagBuilder("label");
tag.Attributes.Add("for", html.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldId(htmlFieldName));
tag.SetInnerText(labelText);
return tag.ToMvcHtmlString(TagRenderMode.Normal);
}
}
}
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