Common/CommonHelper.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using NVelocity.App;
using NVelocity.Runtime;
using NVelocity;

namespace Common
{
    public class CommonHelper
    {
        /// <summary>
        /// 用data数据填充templateName模板，渲染生成html返回
        /// </summary>
        /// <param name="templateName"></param>
        /// <param name="data"></param>
        /// <returns></returns>
        public static string RenderHtml(string templateName,Dictionary<string,object> tempKeyByValue)
        {
             VelocityEngine vltEngine = new VelocityEngine();
            vltEngine.SetProperty(RuntimeConstants.RESOURCE_LOADER, "file");
            vltEngine.SetProperty(RuntimeConstants.FILE_RESOURCE_LOADER_PATH, System.Web.Hosting.HostingEnvironment.MapPath("~/temp"));//模板文件所在的文件夹
            vltEngine.Init();

            VelocityContext vltContext = new VelocityContext();
            foreach (string tempName in tempKeyByValue.Keys) 
            {
                vltContext.Put(tempName, tempKeyByValue[tempName]);//设置参数，在模板中可以通过$data来引用
            }
            Template vltTemplate = vltEngine.GetTemplate(templateName);
            System.IO.StringWriter vltWriter = new System.IO.StringWriter();
            vltTemplate.Merge(vltContext, vltWriter);

            string html = vltWriter.GetStringBuilder().ToString();
            return html;
        }
    }
}