将文件保存到IIS服务器上托管的文件夹

Question

我正在开发一个项目。现在我想将上传的图像保存到 -

中的文件夹中

(http://myipaddress//DinegenieApi//category). 

此文件夹位于C - inetpub - ＆gt; DinegenieApi - ＆gt;类别中。 我收到错误URI格式不受支持。但是当我在浏览器中输入此URL时，我能够访问此文件夹。

实际上我正在检查类别文件夹是否已存在，然后直接保存图像，如果不存在，则首先创建一个名为category的文件夹，然后将图像保存到该文件夹​​。 以下是我正在使用的文件上传代码：

 protected Tuple<string, string, string> fileupload(FileUpload fileupload, string foldername)
{
   Tuple<string, string, string> imgdetails;
        string pathreturn = "";
        string fileextension = (Path.GetExtension(fileupload.FileName)).ToLower();
        string name = "-" + fileupload.PostedFile.FileName;
        string filename = DateTime.Now.ToString("dd-MM-yyyy HH:mm:ss").Replace(":", "-") + name;

        if (fileextension == ".jpeg" || fileextension == ".jpg" || fileextension == ".gif" || fileextension == ".png")
        {
            if (fileupload.PostedFile.ContentLength < 512000)
            {

                //string a = Server.MapPath("~/Filestore/") + foldername;
                //string ipaddress=getipaddress();
                string ipaddress = "http://172.16.0.18:8080";
                string a = ipaddress + "//DinegenieApi//" + foldername;
                Uri test = new Uri(a);
                DirectoryInfo mydir = new DirectoryInfo(a);
                if (Directory.Exists(mydir.ToString()))
                {
                    fileupload.SaveAs(a + "\\" + filename);
                }
                else
                {
                    Directory.CreateDirectory(a);
                    fileupload.SaveAs(a + filename);
                }
                pathreturn =a;
                lblmsg.Text = "";
                imgdetails = new Tuple<string, string, string>(pathreturn, filename, lblmsg.Text);
            }
            else
            {
                lblmsg.Text = "File size should be less than 500kb";
                lblmsg.Visible = true;
                imgdetails = new Tuple<string, string, string>("", "", lblmsg.Text);
            }
        }
        else
        {
            lblmsg.Text = "File type should be jpeg,png,gif";
            lblmsg.Visible = true;
            imgdetails = new Tuple<string, string, string>("", "", lblmsg.Text);
        }

        return imgdetails;
}