获取下一个要上传的文件名

Question

我有以下 C# 代码（关于将文件上传到服务器）

for (int i = 0; i < Request.Files.Count-1; i++)
                {
                    if (Request.ContentLength != 0)
                    {
                        int Size = Request.Files[i].ContentLength / 1024;
                        if (Size <= 512)
                        {
                            string LocalFile = Request.Files[i].FileName;
                            int dot = LocalFile.LastIndexOf('.');
                            string FileType = LocalFile.Substring(dot + 1);
                            if (FileType == "gif" || FileType == "jpg" || FileType == "png" || FileType == "GIF" || FileType == "JPG" || FileType == "PNG")
                            {
                                int LastIndex = LocalFile.LastIndexOf(@"\") + 1;
                                string File = LocalFile.Substring(LastIndex, LocalFile.Length - LastIndex);
                                string Path = Server.MapPath(" ../images/tracks") + "..\\" + File;
                                Request.Files[i].SaveAs(Path);
                                if (i != Request.Files.Count - 1)
                                    ImageList += string.Format("images/tracks/{0}|", File);
                                else { ImageList += string.Format("images/tracks/{0}", File); }
                            }
                        }
                        else
                        {
                            Response.Write("The file is too big !");
                        }
                    }
                    else
                    {
                        Response.Write("Unknown Error !");
                    }
                }

问题是文件上传字段不止一个。

我想创建条件，它将检查文件 [i] 之后是否有文件（如果文件 [i+1] 为空，则检查） 如果是，程序将执行此代码：ImageList += string.Format("images/tracks/{0}", File);

其他：ImageList += string.Format("images/tracks/{0}|", File);

我的问题是条件应该是什么样子？

希望得到帮助，谢谢！

Answer 1

只需删除您的条件（如果）并添加所有带有结束字符的字符串。在循环结束时，您可以删除最后一个字符，如果它是“|”。

在您的代码上：

for (int i = 0; i < Request.Files.Count-1; i++)
            {
                if (Request.ContentLength != 0)
                {
                    int Size = Request.Files[i].ContentLength / 1024;
                    if (Size <= 512)
                    {
                        string LocalFile = Request.Files[i].FileName;
                        int dot = LocalFile.LastIndexOf('.');
                        string FileType = LocalFile.Substring(dot + 1);
                        if (FileType == "gif" || FileType == "jpg" || FileType == "png" || FileType == "GIF" || FileType == "JPG" || FileType == "PNG")
                        {
                            int LastIndex = LocalFile.LastIndexOf(@"\") + 1;
                            string File = LocalFile.Substring(LastIndex, LocalFile.Length - LastIndex);
                            string Path = Server.MapPath(" ../images/tracks") + "..\\" + File;
                            Request.Files[i].SaveAs(Path);
                            //if (i != Request.Files.Count - 1)
                                ImageList += string.Format("images/tracks/{0}|", File);
                            //else { ImageList += string.Format("images/tracks/{0}", File); }
                        }
                    }
                    else
                    {
                        Response.Write("The file is too big !");
                    }
                }
                else
                {
                    Response.Write("Unknown Error !");
                }
            }
           //Remove the last character
           if (ImageList.EndsWith("|")) ImageList = ImageList.Remove(ImageList.Length - 1, 1);
}