File.Delete被另一个进程使用

Question

文件删除问题-请帮助我，我无法删除文件..当我尝试删除文件时，我得到了这个提示

c＃File.Delete-文件被另一个进程使用c＃File.Delete-文件被另一个进程使用

    protected void Button2_Click1(object sender, EventArgs e)
{

    HttpFileCollection hfc = Request.Files;
    string x = "";
    string foldername = DateTime.Now.ToString().Trim().Replace(" ", "").Replace(":", "").Replace("/", "");
    string foldername1 = foldername+"1";
    Directory.CreateDirectory(Server.MapPath("~/IMAGEUPLOADCENTER/") + foldername);
    Directory.CreateDirectory(Server.MapPath("~/IMAGEUPLOADCENTER/") + foldername1);
    for (int i = 0; i < hfc.Count; i++)
    {
        HttpPostedFile hpf = hfc[i];
        if (hpf.ContentLength > 0)
        {
            string name =(DateTime.Now.ToString() + i + hpf.FileName).ToString().Trim().Replace(" ", "").Replace(":", "").Replace("/", "");
            hpf.SaveAs(Server.MapPath("~/IMAGEUPLOADCENTER/" + foldername + "/") + name);
            ResizeImageWidth(497, Server.MapPath("~/IMAGEUPLOADCENTER/" + foldername + "/") + name, Server.MapPath("~/IMAGEUPLOADCENTER/" + foldername1 + "/") + name);
            System.Drawing.Image upImage = System.Drawing.Image.FromFile(Server.MapPath("~/IMAGEUPLOADCENTER/" + foldername1 + "/") + name);  //System.Drawing.Image.FromStream(FU1.PostedFile.InputStream);
            System.Drawing.Image logoImage = System.Drawing.Image.FromFile(Server.MapPath("~/pages002248Xc54/UploadImages/LOGOnew.png"));
            using (Graphics g = Graphics.FromImage(upImage))
            {
                g.DrawImage(logoImage, new Point(upImage.Width - logoImage.Width - 10, 10));
                upImage.Save(Server.MapPath("~/IMAGEUPLOADCENTER/" + foldername + "/") + name);
                File.Delete(Server.MapPath("~/IMAGEUPLOADCENTER/" + foldername1 + "/") + name);
             //   Image1.ImageUrl = "~/UploadFiles/2" + "//" + fileName;
            }
            x = x + "</br><img src='http://hela.co.il/IMAGEUPLOADCENTER/" + foldername + "/" + name + "'/></br>";
        }
    }
    TextArea1.InnerText = x;
    FileUpload1.Visible = false;
    Button2.Visible = false;
}

Answer 1

您的文件已被您锁定，这使您无法删除它。 Image.FromFile方法锁定用于创建对象的文件，直到处理完Image对象为止。 因此，在这种情况下，图像文件将保持锁定状态，直到您处理upImage。

处理完图像后，将File.Delete移至，它将起作用。 在下面的代码中，我向每个变量添加了using语句，以便它们可以被处置（并解锁文件），然后将delete语句移至using块之外（在处置Image对象之后）。

using(System.Drawing.Image upImage =  System.Drawing.Image.FromFile(Server.MapPath("~/IMAGEUPLOADCENTER/" + foldername1 + "/") + name))     
using(System.Drawing.Image logoImage = System.Drawing.Image.FromFile(Server.MapPath("~/pages002248Xc54/UploadImages/LOGOnew.png")))
using (Graphics g = Graphics.FromImage(upImage))
{
    g.DrawImage(logoImage, new Point(upImage.Width - logoImage.Width - 10, 10));
    upImage.Save(Server.MapPath("~/IMAGEUPLOADCENTER/" + foldername + "/") + name);
}
File.Delete(Server.MapPath("~/IMAGEUPLOADCENTER/" + foldername1 + "/") + name);

Image.FromFile方法（字符串）

使用语句（C＃）