//獲得漢字的區位碼
byte[] array = new byte[2];
array = System.Text.Encoding.Default.GetBytes("啊");
int i1 = (short)(array[0] - ''/0'');
int i2 = (short)(array[1] - ''/0'');
//unicode解碼方式下的漢字碼
array = System.Text.Encoding.Unicode.GetBytes("啊");
i1 = (short)(array[0] - ''/0'');
i2 = (short)(array[1] - ''/0'');
//unicode反解碼為漢字
string str = "4a55";
string s1 = str.Substring(0,2);
string s2 = str.Substring(2,2);
int t1 = Convert.ToInt32(s1,16);
int t2 = Convert.ToInt32(s2,16);
array[0] = (byte)t1;
array[1] = (byte)t2;
string s = System.Text.Encoding.Unicode.GetString(array);
//default方式反解碼為漢字
array[0] = (byte)196;
array[1] = (byte)207;
s = System.Text.Encoding.Default.GetString(array);
//取字串長度
s = "iam方槍槍";
int len = s.Length;//will output as 6
byte[] sarr = System.Text.Encoding.Default.GetBytes(s);
len = sarr.Length;//will output as 3+3*2=9
//字串相加
System.Text.StringBuilder sb = new System.Text.StringBuilder("");
sb.Append("i ");
sb.Append("am ");
sb.Append("方槍槍");
/////////////////////////////////////////////////////////////////////
string --> byte array
byte[] data=Syste.Text.Encoding.ASCII.GetBytes(string);
string --> byte
byte data = Convert.ToByte(string);
byte[]-->string
string string = Encoding.ASCII.GetString( bytes, 0, nBytesSize );
C# URL編碼與解碼
--------------------------------------------------------------------------------
最近做了一個網站統計分析系統，特別在搜尋引擎分析那一部分費了不少時間，從已編碼的URL中提取搜尋關鍵詞再進行解碼。主流的搜尋引擎中，URL所使用的字元編碼都不同，比如，baidu預設是gb2312，google預設是utf-8。而百度使用者可以指定utf-8編碼。以這兩個搜尋引擎分析，URL可能是gb2312，也可能是utf-8。頭大了！經過幾番琢磨。得出一個暫時可以對付的簡單方法。
以下是引用片段：
//oStr是UrlEncode編碼字串
Encoding gb2312 = Encoding.GetEncoding("gb2312");
Encoding utf8 = Encoding.UTF8;
//首先用utf-8進行解碼
string key = HttpUtility.UrlDecode(oStr, utf8);
// 將已經解碼的字元再次進行編碼.
string encode = HttpUtility.UrlEncode(key, utf8).ToLower();
//與原來編碼進行對比，如果不一致說明解碼未正確，用gb2312進行解碼
if (oStr != encode)
key = HttpUtility.UrlDecode(oStr, gb2312);
用這樣的方法基本上可以解決了URL的編碼解碼問題了。
asp.net(C#實現) 編碼解碼(HtmlEncode與HtmlEncode)時間:2009-10-16 10:37來源:未知 作者:admin 點擊:246次我要投稿
Default.aspx：
<%@ Page ValidateRequest="false" Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="test_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>asp.net(C#) 編碼解碼(HtmlEncode與HtmlEncode)</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label ID="lblShow" runat="server" Text="Label"></asp:Label>
<asp:TextBox ID="txtInput" runat="server" Height="194px" TextMode="MultiLine" Width="305px"></asp:TextBox>
<asp:Button ID="btnOk" runat="server" Text="提交" OnClick="btnOk_Click" /></div>
</form>
</body>
</html>
Default.aspx.cs：
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
/***********************編碼研究***********************
* 1.預設情況是不允許使用者在TextBox中輸入html標籤的,
* 如果需要輸入,設定Page的ValidateRequest="false"
* 2.可以把輸入的html標籤,比如<input>直接存放在資料庫中,
* 只是在輸出的時候編碼,防止原樣輸出打亂頁面配置.或者呈現html元素.
*****************************************************/
public partial class test_Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void btnOk_Click(object sender, EventArgs e)
{
lblShow.Text = htmlEncode(txtInput.Text);
}
/// <summary>
/// 對輸入的html編碼,同時對斷行符號與空格進行轉換
/// </summary>
/// <param name="str"></param>
/// <returns></returns>
public string htmlEncode(string str)
{
return Server.HtmlEncode(str).Replace("/n", "<br/>").Replace(" ", " ");
}
}
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