方法一：
byte[] byte1 = FileUpload1.FileBytes;
byte[] byte2 = FileUpload2.FileBytes;
byte[] a1 = Encoding.UTF8.GetBytes("[");
byte[] a2 = Encoding.UTF8.GetBytes(",");
byte[] a3 = Encoding.UTF8.GetBytes("]");
byte[] totalaa = new byte[a1.Length + byte1.Length + a2.Length + byte2.Length + a3.Length];
a1.CopyTo(totalaa, );
byte1.CopyTo(totalaa, a1.Length);
a2.CopyTo(totalaa, a1.Length + byte1.Length);
byte2.CopyTo(totalaa, a1.Length + byte1.Length + a2.Length);
a3.CopyTo(totalaa, a1.Length + byte1.Length + a2.Length + byte2.Length);
string total1 = Encoding.UTF8.GetString(totalaa);
方法二：
string fileName = Path.GetFileNameWithoutExtension(FileUpload1.PostedFile.FileName); //获取文件名（不包括扩展名）
string Extension1 = Path.GetExtension(FileUpload1.PostedFile.FileName);//扩展名
string Extension2 = Path.GetExtension(FileUpload2.PostedFile.FileName);
if (Extension1 == "" || Extension2 == "")
{ Response.Write("<script>alert('请添加文件');</script>");
return; }
if (FileUpload1.PostedFile.FileName == FileUpload2.PostedFile.FileName)
{ Response.Write("<script>alert('请添加不同的文件');</script>");
return; }
if (Extension1.ToLower() != ".txt" || Extension2.ToLower() != ".txt")
{ Response.Write("<script>alert('文件后缀名不正确！请输入txt的文件');</script>");
return; }
if (Directory.Exists(Server.MapPath("~/UploadFile")) == false)//判断文件夹是否存在,若不存在则创建
{
Directory.CreateDirectory(Server.MapPath("~/UploadFile"));
}
string UploadFilePath = Server.MapPath("UploadFile\\");
string fullName = FileUpload1.PostedFile.FileName;
string newName = DateTime.Now.ToString("yyyyddmmhhss") + fullName.Substring(fullName.LastIndexOf("."));
FileUpload1.SaveAs(UploadFilePath + FileUpload1.PostedFile.FileName);
FileUpload2.SaveAs(UploadFilePath + FileUpload2.PostedFile.FileName);
FileStream fs = new FileStream(UploadFilePath + newName, FileMode.Create);
string line1 = string.Empty;
string line2 = string.Empty;
using (StreamReader sr1 = new StreamReader(UploadFilePath + FileUpload1.PostedFile.FileName))
{
line1 = sr1.ReadToEnd();
}
using (StreamReader sr2 = new StreamReader(UploadFilePath + FileUpload2.PostedFile.FileName))
{
line2 = sr2.ReadToEnd();
}
try
{
string total = "[" + line1 + "," + line2 + "]";
StreamWriter sw = new StreamWriter(fs);
sw.Write(total);
sw.Flush();
sw.Close();
fs.Close();
if (File.Exists(UploadFilePath + FileUpload1.PostedFile.FileName))
{
File.Delete(UploadFilePath + FileUpload1.PostedFile.FileName);
}
if (File.Exists(UploadFilePath + FileUpload2.PostedFile.FileName))
{
File.Delete(UploadFilePath + FileUpload2.PostedFile.FileName);
}
showmessage.InnerText = "文件上传成功！";
}
catch
{
showmessage.InnerText = "文件上传失败！";
}