JW/Framework/Bowin.Web.Controls.Mvc/HtmlHelperExtensions/VerfyCodeExtensions.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web.Mvc;
using System.Linq.Expressions;

namespace Bowin.Web.Controls.Mvc
{
    public static class VerfyCodeExtensions
    {
        public static MvcHtmlString VerfyCodeFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression, string url)
        {
            if (expression == null)
            {
                throw new ArgumentNullException("expression");
            }

            ModelMetadata modelMetadata = ModelMetadata.FromLambdaExpression<TModel, TProperty>(expression, htmlHelper.ViewData);
            string fullHtmlFieldName = htmlHelper.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(ExpressionHelper.GetExpressionText(expression));
            StringBuilder sb = new StringBuilder();
            sb.AppendFormat("<input type=\"text\" size=\"8\" name=\"{0}\" ", fullHtmlFieldName);
            sb.Append("    style=\"float: left; margin-right: 4px;border: 1px solid #cbcbcb;\" tabIndex=\"0\" placeholder=\"请输入右侧验证码\" />");
            sb.AppendFormat("<img style=\"cursor: hand;\" id=\"vcodeimg\" title=\"点击刷新验证码\" onclick=\"this.src='{0}?' + Math.random()\"", url);
            sb.AppendFormat("    src=\"{0}\" alt=\"\" />", url);

            return MvcHtmlString.Create(sb.ToString());
        }
    }
}