.net pdf文件流转base64 并且预览显示

参考文章 https://www.cnblogs.com/xhy1018/articles/8042107.html
参考文章 https://jingyan.baidu.com/article/3052f5a10fb64e97f31f8683.html
1，文件转成流 fileurl为路径

  private static string ReadFromFile(string fileurl) {
            FileStream fsForRead = new FileStream(fileurl, FileMode.Open);
            string base64Str = "";
            try {
                //读入一个字节
                //Console.Write("文件的第一个字节为：" + fsForRead.ReadByte().ToString());
                //Console.ReadLine();
                //读写指针移到距开头10个字节处
                fsForRead.Seek(0, SeekOrigin.Begin);
                byte[] bs = new byte[fsForRead.Length];
                int log = Convert.ToInt32(fsForRead.Length);
                //从文件中读取10个字节放到数组bs中
                fsForRead.Read(bs, 0, log);
                base64Str = Convert.ToBase64String(bs);
                //Console.Write("base64编码：" + base64Str);
                //Console.ReadLine();
            } catch (Exception) {
                // Console.Write(ex.Message);
                //Console.ReadLine();
            } finally {
                fsForRead.Close();
            }
            return base64Str;
        }

2，base64str接收文件流

   string base64str = "data:application/pdf;base64," + ReadFromFile(fileurl);

3，将base64传到前端

ClientScript.RegisterStartupScript(ClientScript.GetType(), "myscript", "");

4，以下是前端代码

    
    
    
    
    
    

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5，还有一种简单方法，但是只能用谷歌，ie不行

后台：ss.Src = base64str;
前台：