c#导出文件，文件名中文乱码解决方法

public string clfielname(string filename)
    {
        system.web.httpcontext curcontext = system.web.httpcontext.current;
        string outputfilename = null;
        string browser = curcontext.request.useragent.toupper();
        if (browser.contains("ms") == true && browser.contains("ie") == true)
        {
            outputfilename = system.web.httputility.urlencode(filename);
        }
        else if (browser.contains("firefox") == true)
        {
            outputfilename = "\"" + filename + "\"";
        }
        else
        {
            outputfilename = system.web.httputility.urlencode(filename);
        }
        return outputfilename;
    }

原文链接：https://www.cnblogs.com/threestone007/p/5401341.html