stream 、 string 、byte[] 间的相互转换扩展方法

原创

xxj_jing 2022-10-31 07:33:50 博主文章分类：技术资料 ©著作权

文章标签 stream byte string 扩展 image 文章分类 虚拟化云计算

©著作权归作者所有：来自51CTO博客作者xxj_jing的原创作品，请联系作者获取转载授权，否则将追究法律责任

using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.IO;
 using System.Drawing;namespace Ims.Bll
 {
   /// <summary>
   /// stream 、 string 、byte[] 间的转换扩展方法类
   /// </summary>
   public static class StreamExtend
   {
     #region Stream 扩展
     /// <summary>
     /// Stream Stream 转换为 byte 数组
     /// </summary>
     /// <returns></returns>
     public static byte[] ToByteArray(this Stream stream)
     {
       byte[] bytes = new byte[stream.Length]; 
       stream.Read(bytes, 0, bytes.Length); 
       // 设置当前流的位置为流的开始 
       stream.Seek(0, SeekOrigin.Begin); 
       return bytes;
     }
     /// <summary>
     /// Stream 转换为 image 图片
     /// </summary>
     /// <returns></returns>
     public static Image ToImage(this Stream stream)
     {
       Image img = new Bitmap(stream);
       return img;
     }
     /// <summary>
     /// Stream 转换为 string ,使用 Encoding.Default 编码
     /// </summary>
     /// <returns></returns>
     public static string ToStr(this Stream stream)
     {
       return System.Text.Encoding.Default.GetString(stream.ToByteArray());
     }
     #endregion    #region byte[] 扩展
     /// <summary>
     /// byte[] 转换为 stream 流
     /// </summary>
     /// <returns></returns>
     public static Stream ToStream(this byte[] arr)
     {
       Stream stream = new MemoryStream(arr);
       // 设置当前流的位置为流的开始 
       stream.Seek(0, SeekOrigin.Begin); 
       return stream;
     }
     /// <summary>
     /// byte[] 转换为 Image
     /// </summary>
     /// <returns></returns>
     public static Image ToImage(this byte[] arr)
     {
       return Image.FromStream(arr.ToStream());
     }
     /// <summary>
     /// 转换为 string，使用 Encoding.Default 编码
     /// </summary>
     /// <returns></returns>
     public static string ToStr(this byte[] arr)
     {
       return System.Text.Encoding.Default.GetString(arr);
     }
     #endregion    #region string 扩展
     /// <summary>
     /// string 转换为 byte[] 
     /// </summary>
     /// <returns></returns>
     public static byte[] ToByteArray(this string str)
     {
       return System.Text.Encoding.Default.GetBytes(str);
     }
     /// <summary>
     /// string 转换为 Stream 
     /// </summary>
     /// <returns></returns>
     public static Stream ToStream(this string str)
     {
       Stream stream = new MemoryStream(str.ToByteArray());
       // 设置当前流的位置为流的开始 
       stream.Seek(0, SeekOrigin.Begin);
       return stream;
     }
     #endregion
   }
 }

-----------------------------------------------

//测试代码
 
 
     int sourceLength = 0; //数据源长度
       long byteArrLength = 0; //byte[] 的长度
       long streamLength = 0;  //Stream 的长度
       // char 类型
       char c = 'A';
       byte[] byteArr_c = c.ToString().ToByteArray();
       Stream sm_c = c.ToString().ToStream();
       sourceLength = 1;
       byteArrLength = byteArr_c.Length;
       streamLength = sm_c.Length;      //string 类型
       string str = "ABCDEF";
       byte[] byteArr_str = str.ToByteArray();
       Stream sm_str = str.ToStream();
       sourceLength = str.Length;
       byteArrLength = byteArr_str.Length;
       streamLength = sm_str.Length;      //汉字
       string cn = "好";
       byte[] byteArr_cn = cn.ToByteArray();
       Stream sm_cn = str.ToStream();
       sourceLength = cn.Length;
       byteArrLength = byteArr_cn.Length;
       streamLength = sm_cn.Length;      char cn_l = (char)byteArr_cn[0];
       char cn_r = (char)byteArr_cn[1];