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主要是前一页面的编码格式与后一页面接收时不同造成的，可以在前一页面编码，后一页面解码
编码：System.Web.HttpUtility.UrlEncode(str, Encoding.GetEncoding(“GB2312”));
解码：System.Web.HttpUtility.UrlDecode(aa,System.Text.Encoding.GetEncoding(“Gb2312”));