WebForm1.aspx.cs

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using Newtonsoft.Json;
using Newtonsoft.Json.Serialization;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace HtmlToPdf
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

            if (Request.Form["content"] != null && !string.IsNullOrEmpty(Request.Form["content"].ToString()))
            {
                JsonSerializerSettings Settings = new JsonSerializerSettings
                {
                    ContractResolver = new CamelCasePropertyNamesContractResolver(),
                    DateFormatString = "yyyy-MM-dd HH:mm:ss",
                };


                string content = Request.Form["content"];
                string html = Server.UrlDecode(System.Text.Encoding.Default.GetString(Convert.FromBase64String(content)));

                byte[] PdfBytes = ConvertToPdf.HtmlTextConvertToPdf(html);

                Response.ContentType = "application/json";

                string buffer = "";
                if (PdfBytes == null || PdfBytes.Length < 1)
                {
                     buffer = JsonConvert.SerializeObject(new ResultObject() { Code = -9812, Msg = "PDF数据为空！" }, Settings);
                }
                else
                {
                     buffer = JsonConvert.SerializeObject(new ResultObject() { Code = 0, Msg = "",PdfBase64= Convert.ToBase64String(PdfBytes) }, Settings);
                }

                Response.Clear();
                Response.Write(buffer);

            }
        }
    }
    public class ResultObject
    {
        /// <summary>
        /// 等于0表示成功
        /// </summary>
        public int Code { get; set; }
        /// <summary>
        /// code不为0时，返回错误消息
        /// </summary>
        public string Msg { get; set; }
        public string PdfBase64 { get; set; }
    }