asp.net 字符串、二进制、编码数组转换函数

System.Text.UnicodeEncoding converter = new System.Text.UnicodeEncoding();
string spcontent = converter.GetString(byteArr );

int itag=0;

　　　　　　string content = "";

　　　　　　StringBuilder sb = new StringBuilder();

　　　　　　　string fileName = @"c:\test.html";
StreamReader objReader = new StreamReader(fileName, System.Text.Encoding.GetEncoding("gb2312"));
string sLine = "";
while (sLine != null)
　　 {
　　 sLine = objReader.ReadLine();
　　if (sLine != null)
　　{//这里可以做相应的处理，如过滤文件中的数据
　　 sb.Append(sLine);

　　 }
　}

objReader.Close();

content= sb.ToString(); //如果你要将整个文件的内容显示在界面上，你可以用<%=content%>放到相应的地方

　　　　　　System.Text.UnicodeEncoding converter = new System.Text.UnicodeEncoding();
　　　　　　byte[] byteArr = converter.GetBytes(content);

//下面为插入到数据库代码，

strInsertCmd = "insert into Document (DocumentID,DocumentContent,addtime,MODITIME,status) values ('" + DocumentID + "',?,'" + NOWTIME + "','" + NOWTIME + "',' 00 ')";
cmd=new OleDbCommand(strInsertCm,ConnectionOBJ);
param = new OleDbParameter("DocumentContent", OleDbType.VarBinary, byteArr.Length, ParameterDirection.Input, false, 0, 0, null, DataRowVersion.Current, byteArr);
cmd.Parameters.Add(param);
itag=cmd.ExecuteNonQuery();

if(itag>0){//成功！}

public string GB2312ToUTF8(string sSourse) {
string Utf8_info = string.Empty;
Encoding utf8 = Encoding.UTF8;
Encoding gb2312 = Encoding.GetEncoding("gb2312");
byte[] unicodeBytes = gb2312.GetBytes(sSourse);
byte[] asciiBytes = Encoding.Convert(gb2312, utf8, unicodeBytes);
char[] asciiChars = new char[utf8.GetCharCount(asciiBytes, 0, asciiBytes.Length)];
utf8.GetChars(asciiBytes, 0, asciiBytes.Length, asciiChars, 0);
Utf8_info = new string(asciiChars);
return Utf8_info;
}