C#读取文件时自动判断编码函数代码,CSharp代码库,德仔网

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【CSharp】 C#读取文件时自动判断编码函数
作者:Dezai.CN / 发布于2011/3/2/ 598
<div><span style="color: #808080">///</span><span style="color: #008000"> </span><span style="color: #808080"><summary></span><span style="color: #008000">
 </span><span style="color: #808080">///</span><span style="color: #008000"> C#读取文件时自动判断编码函数
 </span><span style="color: #808080">///</span><span style="color: #008000"> </span><span style="color: #808080"></summary></span><span style="color: #008000">
 </span><span style="color: #808080">///</span><span style="color: #008000"> </span><span style="color: #808080"><param name="FILE_NAME"></span><span style="color: #008000">需要判断编码方式文件的物理路径</span><span style="color: #808080">
</span><span style="color: #000000">
如</span><span style="color: #800000">"</span><span style="color: #800000">C:\file\file.txt</span><span style="color: #800000">"</span><span style="color: #000000"></</span><span style="color: #000000">param</span><span style="color: #000000">></span><span style="color: #000000">
 </span><span style="color: #808080">///</span><span style="color: #008000"> </span><span style="color: #808080"><returns></returns></span><span style="color: #808080">
</span><span style="color: #000000"> </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> System.Text.Encoding GetType(</span><span style="color: #0000ff">string</span><span style="color: #000000"> FILE_NAME)
 {
 FileStream fs </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #0000ff">new</span><span style="color: #000000"> FileStream(FILE_NAME, FileMode.Open, 

FileAccess.Read);
 System.Text.Encoding r </span><span style="color: #000000">=</span><span style="color: #000000"> GetType(fs);
 fs.Close();
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> r;
 }

 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> System.Text.Encoding GetType(FileStream fs)
 {
 </span><span style="color: #008000">/*</span><span style="color: #008000">byte[] Unicode=new byte[]{0xFF,0xFE}; 
 byte[] UnicodeBIG=new byte[]{0xFE,0xFF}; 
 byte[] UTF8=new byte[]{0xEF,0xBB,0xBF};</span><span style="color: #008000">*/</span><span style="color: #000000">

 BinaryReader r </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #0000ff">new</span><span style="color: #000000"> BinaryReader(fs, 

System.Text.Encoding.Default);
 </span><span style="color: #0000ff">byte</span><span style="color: #000000">[] ss </span><span style="color: #000000">=</span><span style="color: #000000"> r.ReadBytes(</span><span style="color: #800080">4</span><span style="color: #000000">);
 r.Close();
 </span><span style="color: #008000">//</span><span style="color: #008000">编码类型 Coding=编码类型.ASCII; </span><span style="color: #008000">
</span><span style="color: #000000"> </span><span style="color: #0000ff">if</span><span style="color: #000000"> (ss[</span><span style="color: #800080">0</span><span style="color: #000000">] </span><span style="color: #000000"><=</span><span style="color: #000000"> </span><span style="color: #800080">0xEF</span><span style="color: #000000">)
 {
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (ss[</span><span style="color: #800080">0</span><span style="color: #000000">] </span><span style="color: #000000">==</span><span style="color: #000000"> </span><span style="color: #800080">0xEF</span><span style="color: #000000"> </span><span style="color: #000000">&&</span><span style="color: #000000"> ss[</span><span style="color: #800080">1</span><span style="color: #000000">] </span><span style="color: #000000">==</span><span style="color: #000000"> </span><span style="color: #800080">0xBB</span><span style="color: #000000"> </span><span style="color: #000000">&&</span><span style="color: #000000"> ss[</span><span style="color: #800080">2</span><span style="color: #000000">] </span><span style="color: #000000">==</span><span style="color: #000000"> </span><span style="color: #800080">0xBF</span><span style="color: #000000">)
 {
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> System.Text.Encoding.UTF8;
 }
 </span><span style="color: #0000ff">else</span><span style="color: #000000"> </span><span style="color: #0000ff">if</span><span style="color: #000000"> (ss[</span><span style="color: #800080">0</span><span style="color: #000000">] </span><span style="color: #000000">==</span><span style="color: #000000"> </span><span style="color: #800080">0xFE</span><span style="color: #000000"> </span><span style="color: #000000">&&</span><span style="color: #000000"> ss[</span><span style="color: #800080">1</span><span style="color: #000000">] </span><span style="color: #000000">==</span><span style="color: #000000"> </span><span style="color: #800080">0xFF</span><span style="color: #000000">)
 {
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> System.Text.Encoding.BigEndianUnicode;
 }
 </span><span style="color: #0000ff">else</span><span style="color: #000000"> </span><span style="color: #0000ff">if</span><span style="color: #000000"> (ss[</span><span style="color: #800080">0</span><span style="color: #000000">] </span><span style="color: #000000">==</span><span style="color: #000000"> </span><span style="color: #800080">0xFF</span><span style="color: #000000"> </span><span style="color: #000000">&&</span><span style="color: #000000"> ss[</span><span style="color: #800080">1</span><span style="color: #000000">] </span><span style="color: #000000">==</span><span style="color: #000000"> </span><span style="color: #800080">0xFE</span><span style="color: #000000">)
 {
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> System.Text.Encoding.Unicode;
 }
 </span><span style="color: #0000ff">else</span><span style="color: #000000">
 {
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> System.Text.Encoding.Default;
 }
 }
 </span><span style="color: #0000ff">else</span><span style="color: #000000">
 {
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> System.Text.Encoding.Default;
 }
 }</span>
</div>
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