ASP.NET FileUpload 常用記錄

FileUpload1.HasFile // 判斷是否有檔案

FileUpload1.FileName  // 只取得檔名

FileUpload1.PostedFile.FileName  // 取得完整的路徑和檔名




//用js抓 在firefox 有 full path 但chrome無效
alert(document.getElementById('ContentPlaceHolder1_FileUpload1').value);

抓檔案其實是為了寄出去，後來把檔案的Byte轉Stream寄出去

                System.Net.Mail.Attachment attachment1 = new System.Net.Mail.Attachment(BytesToStream(FileUpload1.FileBytes), FileUpload1.FileName);


/// <summary>
    /// 將 byte[] 轉成 Stream
    /// </summary>
    public Stream BytesToStream(byte[] bytes)
    {
        Stream stream = new MemoryStream(bytes);
        return stream;
    }

//c# 取得server上的完整路徑
Server.MapPath(FileUpload1.FileName);

//多選，html5，IE9以上才支援
可以加這個在html這邊，multiple="multiple"

或用

 <asp:FileUpload ID="FileUpload1" AllowMultiple="true" runat="server" />     

配合多選的上傳的後台CODE

private void fileuploadannex(string case_oid)
    {
        if (FileUpload1.HasFile)
        {
            String savePath = Server.MapPath("~/trace/annex/" + case_oid.Substring(0, 6).ToString() + "/" + case_oid.ToString() + "/");

            if (!Directory.Exists(savePath))//檢查資料夾是否存在
            {
                Directory.CreateDirectory(savePath);//資料夾不在建立資料夾
            }

            HttpFileCollection multipleFiles = Request.Files;
            HttpPostedFile uploadedFile;
            string fileName;
            string NewfileName;
            string NewfileNamePath;
            for (int fileCount = 0; fileCount < multipleFiles.Count; fileCount++)
            {
                uploadedFile = multipleFiles[fileCount];
                fileName = Path.GetFileName(uploadedFile.FileName);
                if (uploadedFile.ContentLength > 0)
                {
                    if (!System.IO.File.Exists(savePath + fileName))//檢查上傳的資料是否有重覆
                    {
                        uploadedFile.SaveAs(savePath + fileName);
                    }
                    else
                    {   //重覆的資料先改名稱
                        NewfileName = fileName.Substring(0, fileName.LastIndexOf("."));
                        NewfileNamePath = fileName.Substring(fileName.LastIndexOf("."), fileName.Length - fileName.LastIndexOf("."));
                        System.IO.File.Move(savePath + fileName, savePath + NewfileName + "_" + DateTime.Now.ToString("yyyyMMddhhmmssfff") + NewfileNamePath);
                        uploadedFile.SaveAs(savePath + fileName);
                    }                
                }
            }
        }