导出excel时文件的名字为乱码

参考了孟宪会在microsoft论坛的回答（http://social.microsoft.com/Forums/zh-CN/1761/thread/61df2773-c8ad-416e-9797-f28201145f8d）
关键是对文件名指定编码方式，就可以解决这个问题了。
另外Office2007时，如果Content-Disposition里不指定文件名及后缀名，输出的格式自动变成.zip了。
有关资料是这样解释的：（http://blog.minidx.com/2008/01/24/436.html）
以前的Office文档是100%的二进制格式。第三方的工具操作起来非常不方便，而 Office2007从整体上都是基于XML格式的，这里并不是说Office2007文档可以保存成XML格式。而是Office2007默认的文档格式就是XML的（Word的docx、Excel的xlsx等）。也许有人会感到奇怪，用文本编辑器打开docx后，显示的仍然是二进制格式，并不是什么 XML。其实docx并不是普通的XML格式，当然，也不只是一个XML文件，docx本质上是一个zip文件，里面有一系列的xml、目录和其他的文件。如果我们将docx改成zip。就可以用winzip等软件将其解开。

                           string vFullName = gaZouDT[0].FILEPATH;
                            string vExtendName = "";
                            string vOutputName = gaZouDT[0].REFERENCE;

                            switch (int.Parse(type))
                            {
                                case EXCLE:
                                case EXCLE_2007:

                                    if (vFullName.EndsWith("xlsx"))
                                    {
                                        vExtendName = vOutputName.EndsWith(".xlsx") ? "" : ".xlsx";

                                        Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
                                    }
                                    else
                                    {
                                        vExtendName = vOutputName.EndsWith(".xls") ? "" : ".xls";

                                        Response.ContentType = "application/vnd.ms-excel";
                                    }

                                    Response.AppendHeader("Content-Disposition", string.Format("attachment; filename={0}{1}", HttpUtility.UrlEncode(vOutputName, System.Text.UTF8Encoding.UTF8), vExtendName));

                                    break;
                                case PDF:
                                    Response.ContentType = "application/pdf";
                                    Response.AppendHeader("Content-Disposition", "attachment");
                                    break;
                                case WORD:
                                case WORD_2007:

                                    if (vFullName.EndsWith("docx"))
                                    {
                                        vExtendName = vOutputName.EndsWith(".docx") ? "" : ".docx";

                                        Response.ContentType = "application/vnd.openxmlformats-officedocument.wordprocessingml.document";
                                    }
                                    else
                                    {
                                        vExtendName = vOutputName.EndsWith(".doc") ? "" : ".doc";

                                        Response.ContentType = "application/msword";
                                    }

                                    Response.AppendHeader("Content-Disposition", string.Format("attachment; filename={0}{1}", HttpUtility.UrlEncode(vOutputName, System.Text.UTF8Encoding.UTF8), vExtendName));

                                    break;

                            }

                            Response.Charset = "UTF-8";
                            Response.TransmitFile(gaZouDT[0].FILEPATH);
                            Response.End();