JSON中的特殊字符过滤

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/// <summary>
/// 加载事件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void Page_Load(object sender, EventArgs e)
{
    if(!IsPostBack)
    {
        FileStream fsSteam = new FileStream(Server.MapPath("~/SQLLog.txt"), FileMode.Open); //SQLLog.txt 里面的文本为：今天真\n\\n\b\\\\\\的很"高兴"！
        StreamReader sr = new StreamReader(fsSteam,System.Text.Encoding.GetEncoding("gb2312"));
        string message = JsonCharFilter(sr.ReadToEnd()); // 这里需要过滤一下，以保证JSON解析后显示的值与SQLLog.txt中的一模一样。
        sr.Close();
        fsSteam.Dispose();
        string json = "{ IfSuccess : true, Message : '" + message + "' }";
        this.ltMessage.Text = json;
    }
}

/// <summary>
/// Json特符字符过滤，参见http://www.json.org/
/// </summary>
/// <param name="sourceStr">要过滤的源字符串</param>
/// <returns>返回过滤的字符串</returns>
public static string JsonCharFilter(string sourceStr)
{
    sourceStr = sourceStr.Replace("\\", "\\\\");
    sourceStr = sourceStr.Replace("\b", "\\\b");
    sourceStr = sourceStr.Replace("\t", "\\\t");
    sourceStr = sourceStr.Replace("\n", "\\\n");
    sourceStr = sourceStr.Replace("\n", "\\\n");
    sourceStr = sourceStr.Replace("\f", "\\\f");
    sourceStr = sourceStr.Replace("\r", "\\\r");
    return sourceStr.Replace("\"", "\\\"");
}

前台代码：

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Literal ID="ltCurrentMessage" runat="server" />
    </div>
    <div id="divMessage"><asp:Literal ID="ltMessage" runat="server" /></div>
    <div>
        <asp:Button ID="btnSubmit" runat="server" Text="提交" OnClick="btnSubmit_Click" />
    </div>
    </form>
    <script language="javascript" type="text/javascript">
        ///<summary>用正则表达式将前后空格，用空字符串替代。</summary>
        String.prototype.trim = function()
        {
            return this.replace(/(^\s*)|(\s*$)/g, "");
        }
        var jsonStr = document.getElementById("divMessage").innerHTML.trim();
        var jsonObj = eval("(" + jsonStr + ")");
        alert(jsonObj.IfSuccess);
        alert(jsonObj.Message);
    </script>
</body>
</html>

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