form表单提交上传附件

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name：<input type="text" id="name" name="name" style=" width:500px; margin-left:9px" />

上传附件：<input type="file" id="files" name="files" runat="server"style=" width:500px; margin-left:9px" />

</form>

protected string AllowExt = "bmp|doc|docx|gif|jpeg|jpg|pdf|png|ppt|pptx|txt|xls|xlsx";//支持的文件格式
int FileMaxSize = 10240;//文件大小，单位为K
public ActionResult post( MODELNAME model)
{
System.Web.HttpContext.Current.Response.ContentType = "text/plain";
string ParentID = System.Web.HttpContext.Current.Request.Params["id"];
HttpPostedFile fileUpload = System.Web.HttpContext.Current.Request.Files[0];
if (fileUpload != null)
{
string UploadDir = "~/upload/";//图片保存的文件夹
//图片保存的文件夹路径
string path = System.Web.HttpContext.Current.Server.MapPath(UploadDir);
//每天上传的图片一个文件夹
string folder = DateTime.Now.ToString("yyyyMM");
//如果文件夹不存在，则创建
if (!Directory.Exists(path + folder))
{
Directory.CreateDirectory(path + folder);
}
//上传图片的扩展名
string fileExtension = fileUpload.FileName.Substring(fileUpload.FileName.LastIndexOf('.'));
//判断文件格式
if (!CheckValidExt(fileExtension))
{
System.Web.HttpContext.Current.Response.Write("错误提示：文件格式不正确！" + fileExtension);

}
//判断文件大小
if (fileUpload.ContentLength > FileMaxSize * 1024)
{
System.Web.HttpContext.Current.Response.Write("错误提示：上传的文件(" + fileUpload.FileName + ")超过最大限制：" + FileMaxSize + "KB");

}
//保存图片的文件名
//string saveName = Guid.NewGuid().ToString() + fileExtension;
//使用时间+随机数重命名文件
string strDateTime = DateTime.Now.ToString("yyMMddhhmmssfff");//取得时间字符串
Random ran = new Random();
string strRan = Convert.ToString(ran.Next(100, 999));//生成三位随机数
string saveName = strDateTime + strRan + fileExtension;

SYS_FILE file = new SYS_FILE();
file.SID = CommonBLL.GetMaxID("SYS_FILE");
file.CREATE_DATE = DateTime.Now;
file.CREATEUSER_NAME = user.LOGINNAME;
file.CREATEUSER_SID = user.SID;
file.EXTNAME = fileExtension;
file.FILELENGTH = fileUpload.ContentLength;
file.FILENAME = fileUpload.FileName;
file.FILEPATH = UploadDir + folder + "/" + saveName;
fileUpload.SaveAs(path + folder + "/" + saveName);
SYS_FILEBLL.Add(file);

}
   MODELNAMEBLL.Add(model);

return View("viewname", model);

}

注意：Current.Request.Files 为空原因

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