彻底解决的方法:
string FileName = System.Web.HttpUtility.UrlEncode(System.Text.Encoding.UTF8.GetBytes("考勤" + path + ".xls"));
//HttpContext.Current.Response.AddHeader("Content-Disposition", "inline;filename=" + System.Convert.ToChar(34) + FileName + System.Convert.ToChar(34));
HttpContext.Current.Response.AppendHeader("Content-Disposition", "inline;filename=" + System.Convert.ToChar(34) + FileName + System.Convert.ToChar(34));
注意:其中inline是在线,attachment是（下载）
public static string UrlEncode(string str, System.Text.Encoding e)
Member of System.Web.HttpUtility
Summary:
Encodes a URL string using the specified encoding object.
Parameters:
e: The System.Text.Encoding object that specifies the encoding scheme.
str: The text to encode.
Returns:
An encoded string.
public sealed class HttpUtility
Member of System.Web
Summary:
Provides methods for encoding and decoding URLs when processing Web requests. This class cannot be inherited.