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實現unicode與gb2312編碼轉換!

編輯：.NET實例教程

在JavaSCRIPT中可以用encode和unencode函數再用上正則表達式可以將比如"中" 轉化成"中"表示.
在C#中我們可以用Rexgex.Repalce()這個方法來處理,實現的代碼如下:

頁面的代碼如下:

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;

using System.Text;

using System.Text.RegularExpressions;

public partial class UnicodeToGB2312 : System.Web.UI.Page

...{

protected void Page_Load(object sender, EventArgs e)

...{

}

protected void btnConvert_Click(object sender, EventArgs e)

...{

string result = txtContent.Text;

if (btnConvert.Text == "解碼")

...{

btnConvert.Text = "編碼";

result = UnEncode(result);

txtContent.Text = result;

}

else

...{

btnConvert.Text = "解碼";

result = Encode(result);

txtContent.Text = result;

}

protected string Encode(string inputString)

...{

MatchEvaluator matchEvaluator = new MatchEvaluator(EncodeFindSubString); //初始化一個委托,該委托用於處理Regex.Repalce中每次匹配的match對象

        string result = System.Text.RegularExpressions.Regex.Replace(inputString, @"[^\u0000-\u00FF]", matchEvaluator);
        return result;
    }
    protected string UnEncode(string inputString)
    {
        MatchEvaluator matchEvaluator = new MatchEvaluator(UnEncodeFindSubString);
        string result = System.Text.RegularExpressions.Regex.Replace(inputString, @"&#x([0-9a-fA-F]{4});", matchEvaluator);
        return result;
    }
    protected string EncodeFindSubString(Match match) //編碼的時候委托處理函數
    {
        byte[] bytes = Encoding.Unicode.GetBytes(match.Value);
        string result = "";
        for (int i = bytes.Length - 1; i >= 0; i--)
        {
           result += ToHexString(bytes[i]);
        }
        result = "&#x" + result + ";";
        return result;
    }
    protected string UnEncodeFindSubString(Match match) //解碼的時候委托處理函數
    {
        string result = match.Groups[1].Value;
        byte[] bytes = new byte[2]; //4E 2D
        bytes[1] = byte.Parse(result.Substring(0,2),System.Globalization.NumberStyles.AllowHexSpecifIEr);
        bytes[0] = byte.Parse(result.Substring(2, 2), System.Globalization.NumberStyles.AllowHexSpecifIEr);
        result = result.Replace(result, Encoding.Unicode.GetString(bytes));
        return result;
    }
    protected string ToHexString(byte a) //返回一個16進制表示的數
    {
        string result = a.ToString("X");
        if (result.Length == 2)
        {
            return result;
        }
        else
        {
            return "0" + result; //如果就一位比如"7"的16進制返回的是"7"而我們需要 "07"
        }
    }
}

<%...@ Page Language="C#" AutoEventWireup="true" CodeFile="UnicodeToGB2312.ASPx.cs" Inherits="UnicodeToGB2312" validateRequest=false %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xHtml1-transitional.dtd">

<title>Unicode<->GB2312轉換</title>

</head>

<body>

<div >

<asp:TextBox ID="txtContent" runat="server" Height="507px" TextMode="MultiLine" Width="814px"></ASP:TextBox>

<br />

<ASP:Button ID="btnConvert" runat="server" Text="解碼" OnClick="btnConvert_Click" Height="24px" Width="59px" /></div>

</form>

</body>

</Html>