public Stream Download(string fileserviceid, string path, string fileName, string originalFileName, string preview)
{
if (string.IsNullOrEmpty(path) || string.IsNullOrEmpty(fileName))
return default(Stream);
string tempFilePath = Path.Combine(ConfigurationManager.AppSettings["FileServiceRoot" + fileserviceid], path, "files", string.Format("{0}{1}", fileName, Path.GetExtension(originalFileName)));
if (File.Exists(tempFilePath))
{
var outgoingResponse = System.Web.HttpContext.Current.Response;
outgoingResponse.ContentType = MapContentType(Path.GetExtension(originalFileName));
Encoding code = Encoding.GetEncoding("gb2312");
outgoingResponse.ContentEncoding = code;
outgoingResponse.HeaderEncoding = code;//这句很重
outgoingResponse.AddHeader("Content-Disposition", "attachment;filename=" + originalFileName);
//记录log
Stream result = new FileStream(tempFilePath, FileMode.Open, FileAccess.Read, FileShare.Read);
return result;
}
else
{
return default(Stream);
}
}
转载一篇,备用:
最近在Asp.net项目中遇到一个问题，实现文件下载时，英文文件名的文件下载时，文件名显示正常，但是如果文件名为中文则显示乱码。
在网上google了一下，找到这编文章：解决用ASP.NET下载文件时,文件名为乱码的问题
string encodefileName= System.Web.HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8); //通过使用HttpUtility.UrlEncode()来对原始文件名进行编码,以解决文件名乱码
Response.AppendHeader("content-disposition", "attachment;filename=" + encodefileName);//附件下载
但是以上这个方案，存在一个问题：就是如果文件名中有空格则空格变成了“+” 号，其他特殊字符尚未测试，有可能还存在其他问题。
再次使用google,终于找到老外的一编文章：Display a non-US-ASCII filename in File Download dialog box
他使用如下code解决问题：
string encodefileName=ToHexString(fileName); //使用自定义的ToHexString()方法，编码原始文件名
Response.AppendHeader("content-disposition", "attachment;filename=" + encodefileName);
/// <summary>
/// Encodes non-US-ASCII characters in a string.
/// </summary>
/// <param name="s"></param>
/// <returns></returns>
public static string ToHexString(string s)
{
char[] chars = s.ToCharArray();
StringBuilder builder = new StringBuilder();
for (int index = 0; index < chars.Length; index++)
{
bool needToEncode = NeedToEncode(chars[index]);
if (needToEncode)
{
string encodedString = ToHexString(chars[index]);
builder.Append(encodedString);
}
else
{
builder.Append(chars[index]);
}
}
return builder.ToString();
}
/// <summary>
/// Determines if the character needs to be encoded.
/// </summary>
/// <param name="chr"></param>
/// <returns></returns>
private static bool NeedToEncode(char chr)
{
string reservedChars = "$-_.+!*'(),@=&";
if (chr > 127)
return true;
if (char.IsLetterOrDigit(chr) || reservedChars.IndexOf(chr) >= 0)
return false;
return true;
}
/// <summary>
/// Encodes a non-US-ASCII character.
/// </summary>
/// <param name="chr"></param>
/// <returns></returns>
private static string ToHexString(char chr)
{
UTF8Encoding utf8 = new UTF8Encoding();
byte[] encodedBytes = utf8.GetBytes(chr.ToString());
StringBuilder builder = new StringBuilder();
for (int index = 0; index < encodedBytes.Length; index++)
{
builder.AppendFormat("%{0}", Convert.ToString(encodedBytes[index], 16));
}
return builder.ToString();
}