帮我看看我这个下载方法哪有问题?乱码

[xinlingdeai]

为什么用了UTF-8还乱吗。
整个站全是UTF-8
数据类型是NVARCHAR
public static void ResponseFile(string filepath, string filename, string filetype)
{
Stream iStream = null;

// 缓冲区为10k
byte[] buffer = new Byte[10000];

// 文件长度
int length;

// 需要读的数据长度
long dataToRead;

try
{
// 打开文件
iStream = new FileStream(filepath, FileMode.Open, FileAccess.Read, FileShare.Read);


// 需要读的数据长度
dataToRead = iStream.Length;

HttpContext.Current.Response.ContentType = filetype;
HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment;filename=" + Utils.UrlEncode(filename.Trim()).Replace("+", " "));

while (dataToRead > 0)
{
// 检查客户端是否还处于连接状态
if (HttpContext.Current.Response.IsClientConnected)
{
length = iStream.Read(buffer, 0, 10000);
HttpContext.Current.Response.OutputStream.Write(buffer, 0, length);
HttpContext.Current.Response.Flush();
buffer = new Byte[10000];
dataToRead = dataToRead - length;
}
else
{
// 如果不再连接则跳出死循环
dataToRead = -1;
}
}
}
catch (Exception ex)
{
HttpContext.Current.Response.Write("Error : " + ex.Message);
}
finally
{
if (iStream != null)
{
// 关闭文件
iStream.Close();
}
}
HttpContext.Current.Response.End();
}

[人生就是赌]

在这里

try 
                { 
                    // 打开文件 
                    iStream = new FileStream(filepath, FileMode.Open, FileAccess.Read, FileShare.Read); 


                    // 需要读的数据长度 
                    dataToRead = iStream.Length; 

                    HttpContext.Current.Response.ContentType = filetype; 
                    HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment;filename=" + Utils.UrlEncode(filename.Trim()).Replace("+", " ")); 

                    while (dataToRead > 0) 
                    { 
                        // 检查客户端是否还处于连接状态 
                        if (HttpContext.Current.Response.IsClientConnected) 
                        { 
                            length = iStream.Read(buffer, 0, 10000); 
                            HttpContext.Current.Response.OutputStream.Write(buffer, 0, length); 
                            HttpContext.Current.Response.Flush(); 
                            buffer = new Byte[10000]; 
                            dataToRead = dataToRead - length; 
                        } 
                        else 
                        { 
                            // 如果不再连接则跳出死循环 
                            dataToRead = -1; 
                        } 
                    } 
                } 

增加一句

try 
                { 
                    // 打开文件 
                    iStream = new FileStream(filepath, FileMode.Open, FileAccess.Read, FileShare.Read); 


                    // 需要读的数据长度 
                    dataToRead = iStream.Length; 

                    HttpContext.Current.Response.ContentType = filetype; 
                    HttpContext.Current.Response.ContentType = "application/octet-stream";
                    HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment;filename=" + Utils.UrlEncode(filename.Trim()).Replace("+", " ")); 

                    while (dataToRead > 0) 
                    { 
                        // 检查客户端是否还处于连接状态 
                        if (HttpContext.Current.Response.IsClientConnected) 
                        { 
                            length = iStream.Read(buffer, 0, 10000); 
                            HttpContext.Current.Response.OutputStream.Write(buffer, 0, length); 
                            HttpContext.Current.Response.Flush(); 
                            buffer = new Byte[10000]; 
                            dataToRead = dataToRead - length; 
                        } 
                        else 
                        { 
                            // 如果不再连接则跳出死循环 
                            dataToRead = -1; 
                        } 
                    } 
                }