bootstrap-wysiwyg 结合 base64 解码 .net bbs 图片操作类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Net;
using System.IO;
using KT_Product_Show_V3.Models;
using KT_Product_Show_V3.Controllers;
using System.Text.RegularExpressions;
using System.Drawing.Imaging;

namespace KT_Product_Show_V3
{
  public partial class ImageTool
  {
    public static string BuildImg(string webUrl, int Size, string directory)
    {
      Bitmap bmp;
      System.Drawing.Image img;
      string filename = "";
      if (!Directory.Exists(directory))
      {
        return "";
      }
      WebRequest WebReq = WebRequest.Create(webUrl);
      WebReq.Method = "GET";
      img = System.Drawing.Image.FromStream(WebReq.GetResponse().GetResponseStream());
      bmp = new Bitmap(Size, Size);
      System.Drawing.Graphics gr = System.Drawing.Graphics.FromImage(bmp);
      gr.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
      gr.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
      gr.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
      System.Drawing.Rectangle rectDestination = new System.Drawing.Rectangle(0, 0, Size, Size);
      gr.DrawImage(img, rectDestination, 0, 0, img.Width, img.Height, GraphicsUnit.Pixel);
      filename = DateTime.Now.ToFileTime().ToString() + "_" + Size + ".jpeg";
      bmp.Save(directory + filename);
      Qiniu_API.PutFile(directory + filename, filename);
      bmp.Dispose();
      img.Dispose();
      return filename;
    }

    public static string Base64StringToImage(string strsuffix, string strbase64)
    {
      string path = "C:\DescripttionImg\";
      string FileName_withOutstrsuffix = DateTime.Now.ToString("yyMMddhhmmss") + Guid.NewGuid().ToString("N");
      string FileName = string.Format(@"{0}.{1}", FileName_withOutstrsuffix, strsuffix);
      if (!Directory.Exists(path))
      {
        Directory.CreateDirectory(path);
      }
      try
      {
        byte[] arr = Convert.FromBase64String(strbase64);
        MemoryStream ms = new MemoryStream(arr);
        Bitmap bmp = new Bitmap(ms);
        bmp.Save(path + FileName);
        ms.Close();

        Qiniu_API.PutFile(path + FileName, FileName);

      }
      catch (Exception ex)
      {

      }
      finally
      {

      }
      return string.Format("http://{0}/{1}", Qiniu_API.Domain, FileName);
    }

    public static string ImgToBase64String(string Imagefilename)
    {
      try
      {
        Bitmap bmp = new Bitmap(Imagefilename);

        MemoryStream ms = new MemoryStream();
        bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
        byte[] arr = new byte[ms.Length];
        ms.Position = 0;
        ms.Read(arr, 0, (int)ms.Length);
        ms.Close();
        return Convert.ToBase64String(arr);
      }
      catch (Exception ex)
      {
        return null;
      }
    }

    public static string DescripttionDecode(string str)
    {
      string pattern = @"data:image/[a-z]+;base64,([a-z0-9-A-z]|[+]|[/\]|[=])*";
      string pattern_suffix = @"data:image/[a-z]+;base64,";
      RegexOptions regexOptions = RegexOptions.None;
      Regex regex = new Regex(pattern, regexOptions);
      Regex regex_suffix = new Regex(pattern_suffix, regexOptions);
      foreach (Match match in regex.Matches(str))
      {
        if (match.Success)
        {
          string path = "";
          string Temp = regex_suffix.Match(match.Value).Value;
          string suffix = Temp.Replace("data:image/", "").Replace(";base64,", "");
          string base64 = match.Value.Replace(Temp, "");
          path = Base64StringToImage(suffix, base64);
          str = str.Replace(match.Value, path);

        }
      }

      return str;
    }

    public static string DescripttionDecodeCutMaxWidth(string str, int MaxWidth)
    {
      string pattern = @"data:image/[a-z]+;base64,([a-z0-9-A-z]|[+]|[/\]|[=])*";
      string pattern_suffix = @"data:image/[a-z]+;base64,";
      RegexOptions regexOptions = RegexOptions.None;
      Regex regex = new Regex(pattern, regexOptions);
      Regex regex_suffix = new Regex(pattern_suffix, regexOptions);
      foreach (Match match in regex.Matches(str))
      {
        if (match.Success)
        {
          string path = "";
          string Temp = regex_suffix.Match(match.Value).Value;
          string suffix = Temp.Replace("data:image/", "").Replace(";base64,", "");
          string base64 = match.Value.Replace(Temp, "");
          path = Base64StringToImageCutMaxWidth(suffix, base64,MaxWidth);
          str = str.Replace(match.Value, path);

        }
      }

      return str;
    }
    public static string Base64StringToImageCutMaxWidth(string strsuffix, string strbase64, int MaxWidth)
    {
      string path = "C:\DescripttionImg\";
      string FileName_withOutstrsuffix = DateTime.Now.ToString("yyMMddhhmmss") + Guid.NewGuid().ToString("N");
      string FileName = string.Format(@"{0}.{1}", FileName_withOutstrsuffix, strsuffix);
      if (!Directory.Exists(path))
      {
        Directory.CreateDirectory(path);
      }
      try
      {
        byte[] arr = Convert.FromBase64String(strbase64);
        MemoryStream ms = new MemoryStream(arr);
        Bitmap bmp = new Bitmap(ms);
        if (bmp.Width > MaxWidth)
        {
          bmp = KiResizeImage(bmp, MaxWidth, MaxWidth * bmp.Height / bmp.Width);
        }

        // bmp.Width = MaxWidth;
        // bmp.Height
        bmp.Save(path + FileName);
        ms.Close();

        Qiniu_API.PutFile(path + FileName, FileName);

      }
      catch (Exception ex)
      {

      }
      finally
      {

      }
      return string.Format("http://{0}/{1}", Qiniu_API.Domain, FileName);
    }
    public static Bitmap KiResizeImage(Bitmap bmp, int newW, int newH)
    {
      try
      {
        Bitmap b = new Bitmap(newW, newH);
        Graphics g = Graphics.FromImage(b);

        // 插值算法的质量
        g.InterpolationMode = InterpolationMode.HighQualityBicubic;
        g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
        g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
        //g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
        g.DrawImage(bmp, new Rectangle(0, 0, newW, newH), new Rectangle(0, 0, bmp.Width, bmp.Height), GraphicsUnit.Pixel);
        g.Dispose();

        return b;
      }
      catch
      {
        return null;
      }
    }

  }
}

先上传到本地 然后到 七牛云 存储，最后 ，在 bbs 上显示 图片 直接 来源于七牛，本地也保存了一份，后续扩展到一键切换到本地读取功能。还可以使用负载均衡。

上面这个  图片操作类 还提供了 头像裁剪 之后 的 上传 大、小 图片 的方法。

[HttpPost]
    [ValidateInput(false)]
    public void AddDescripttion()
    {
      if (Request.Form["Descripttion"] == null)
      {
        Response.Write(0);
        Response.End();

      }
      string str = Request.Form["Descripttion"].ToString();
      Discuz discuz = new Discuz();
      discuz.CreateTime = DateTime.Now;
      discuz.Descripttion = ImageTool.DescripttionDecode(str);
      discuz.Floor = conn.Database.SqlQuery<int>("select isnull( max(Floor),0) from dbo.Discuz").FirstOrDefault() + 1;
      discuz.ForumId = 1;
      discuz.IsFather = true;
      discuz.Isgood = 0;
      discuz.IsPass = 1;
      discuz.UserId = 1;
      conn.Discuz.Add(discuz);
      conn.SaveChanges();
      Response.Write(1);
      Response.End();
    }

MVC  bbs发表帖子 的调用 action , [ValidateInput(false)]  结合 网站 web.config 文件 中的  <system.webServer> 下的<validation validateIntegratedModeConfiguration="false" />  一起用 ，才能解决

从客户端 中检测到有潜在危险的 Request.Form 值  报错的问题。
   

 还介绍一个好的  Regex 工具

下载之后 我找了 半天 ，原来 在 这里啊！

img  的 src 属性 可以 是 data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUA

AAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO

9TXL0Y4OHwAAAABJRU5ErkJggg==" >  这种不支持图片缓存。