private static void FixStrExplain(LabelInShell shell, ref string prefix, ref string postfix)
{
if ((shell & LabelInShell.StarBefore) > 0)
{
prefix += "<span class='red'>*</span>";
}
if ((shell & LabelInShell.StarAfter) > 0)
{
postfix += "<span class='red'>*</span>";
}
if ((shell & LabelInShell.ColonAfter) > 0)
{
postfix += ":";
}
}
/// <summary>
/// 返回一个HTML label标签，标签内容来源于输入的参数中表达式所指定的属性及前后缀
/// </summary>
/// <typeparam name="TModel"></typeparam>
/// <typeparam name="TValue"></typeparam>
/// <param name="html"></param>
/// <param name="expression"></param>
/// <param name="labelText"></param>
/// <param name="shell"></param>
/// <returns></returns>
public static MvcHtmlString LabelFor <TModel, TValue>(this HtmlHelper <TModel> html, Expression <Func <TModel, TValue> > expression, string labelText, LabelInShell shell)
{
if (html == null)
{
throw new ArgumentNullException("html");
}
return(LabelHelper(html, ModelMetadata.FromLambdaExpression <TModel, TValue>(expression, html.ViewData), ExpressionHelper.GetExpressionText(expression), shell, labelText));
}
/// <summary>
/// 内部处理
/// </summary>
/// <param name="html"></param>
/// <param name="metadata"></param>
/// <param name="htmlFieldName"></param>
/// <param name="shell"></param>
/// <param name="labelText"></param>
/// <returns></returns>
internal static MvcHtmlString LabelHelper(HtmlHelper html, ModelMetadata metadata, string htmlFieldName, LabelInShell shell, string labelText = null)
{
string str = labelText ?? (metadata.DisplayName ?? (metadata.PropertyName ?? htmlFieldName.Split(new char[] { '.' }).Last <string>()));
if (string.IsNullOrEmpty(str))
{
return(MvcHtmlString.Empty);
}
string prefix = string.Empty;
string postfix = string.Empty;
FixStrExplain(shell, ref prefix, ref postfix);
str = string.Format("{0}{1}{2}", prefix, str, postfix);
TagBuilder tagBuilder = new TagBuilder("label");
tagBuilder.Attributes.Add("for", TagBuilder.CreateSanitizedId(html.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(htmlFieldName)));
tagBuilder.InnerHtml = str;
return(new MvcHtmlString(tagBuilder.ToString(TagRenderMode.Normal)));
}
/// <summary>
/// 返回一个HTML label标签，标签内容来源于输入的参数中表达式所指定的属性及前后缀
/// </summary>
/// <typeparam name="TModel"></typeparam>
/// <typeparam name="TValue"></typeparam>
/// <param name="html"></param>
/// <param name="expression"></param>
/// <param name="shell"></param>
/// <returns></returns>
public static MvcHtmlString LabelFor <TModel, TValue>(this HtmlHelper <TModel> html, Expression <Func <TModel, TValue> > expression, LabelInShell shell)
{
return(html.LabelFor(expression, null, shell));
}
