stream 、 string 、byte[] 间的相互转换扩展方法

忘是亡心i 2024-02-17 23:21 75阅读 0赞

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\[1\];

技术支持：http://blog.csdn.net/xxj\_jing

对于上面的代码 [http://blog.csdn.net/xxj\_jing/article/details/7514046][http_blog.csdn.net_xxj_jing_article_details_7514046] 里进行了部分扩展，支持了 stream和byte 的搜索、查找方法！

[http_blog.csdn.net_xxj_jing_article_details_7514046]: http://blog.csdn.net/xxj_jing/article/details/7514046