C# ASP.NET 使用 FileUpload如何判断要上传文件大小

ASP.NET(C#)中使用FileUpload上传文件，我想在按“确定上传”之前先判断一下该文件名称是否存在服务器文件夹了，就是说如果存在就提示说该文件已经存在，还有，我想在按确定按钮之前判断要上传的文件的大小（使用时间当然越短越好），请指教

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相关建议 2013-07-10

protected void btnup_Click(object sender, EventArgs e)
{
string fileName, fileExtension, filefold,size;
fileName = FileUpload1.FileName.ToString();
fileExtension = System.IO.Path.GetExtension(fileName).ToLower().Replace(".","");
if (FileUpload1.FileContent.Length != 0)
{
if (fileExtension == "jpg" || fileExtension == "jpeg" || fileExtension == "gif" || fileExtension == "rar" || fileExtension == "bmp")
{
size = Convert.ToDecimal(FileUpload1.FileContent.Length / 1000).ToString("#0.0");
filefold = DateTime.Now.Year.ToString() + "-" + DateTime.Now.Month.ToString();
filefold = filefold + "/";
string path = Server.MapPath("upfile/") + filefold;
DirectoryInfo directory = new DirectoryInfo(path);
if (!directory.Exists) //目录不存在创建
{directory.Create();}
//文件新名称
string name = DateTime.Now.ToString("yyyyMMdd HHmmss");
name = name.Replace("-", "");
name = name.Replace(":", "");
name = name.Replace(" ", "");
name = name.Trim() +"."+ fileExtension;
FileUpload1.SaveAs(path + "/" + name.Trim());
//保存数据
//model_upfile.titleid = Convert.ToInt64(title_id);
model_upfile.useid = STR.NameToId(Session["UserName"].ToString());
model_upfile.oldname = fileName;
model_upfile.newname = name;
model_upfile.Extension = fileExtension;
model_upfile.uptime = DateTime.Now.ToString();
model_upfile.type = type;
model_upfile.Filefold = filefold;
model_upfile.describer = txtms.Text.Trim();
model_upfile.down = 0;
model_upfile.Sizes = size.ToString();
model_upfile.timestring = ViewState["timestring"].ToString();
bll_upfile.Add(model_upfile);
Response.Write("<script>alert('上传文件成功!')</script>");
bind(); csg.BLL.T_User bll_user = new csg.BLL.T_User();
csg.Model.T_User model_user = new csg.Model.T_User();
//给楼主积分
model_user = bll_user.GetModel(STR.NameToId(Session["UserName"].ToString()));
model_user.scores += 1;
bll_user.Update(model_user);
}
else
{
Response.Write("<script>alert('上传失败!\\n只支持jpg|jpeg|gif|bmp|rar\\n如需上传其他文件请压缩后上传!')</script>");
}
}
else
{
Response.Write("<script>alert('请选择要上传文件!')</script>");
}

}

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其他看法

第1个回答 2013-07-10

在服务端是没有办法计算的，你可以用js 脚本计算（当然如果浏览器禁用了FSO的组件就用不成了）。看看下面的例子：<html> <input type="file" name="file1" onchange="ShowSize(this.value)"> </SPAN></li><script language="JavaScript"> </SPAN></li> </SPAN></li></script> </SPAN></li></html> </SPAN></li>

第2个回答 2013-07-10

try

public static long GetRemoteHTTPFileSize(string sURL)
{
long size = 0L;
try
{
System.Net.HttpWebRequest request = (System.Net.HttpWebRequest)System.Net.WebRequest.Create(sURL);
request.Method = "HEAD";

System.Net.HttpWebResponse response = (System.Net.HttpWebResponse)request.GetResponse();

size = response.ContentLength;
//size = System.Convert.ToInt64(response.Headers["Content-Length"]);
response.Close();
}
catch
{
size = 0L;
}

return size;
}本回答被网友采纳

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