Question

尝试将文件名添加到字符串结尾时出错：

 if (FileUploadControl.HasFile)
    {
        try
        {
            string theUserId = Session["UserID"].ToString();
            OdbcConnection cn = new OdbcConnection("Driver={MySQL ODBC 3.51 Driver}; Server=localhost; Database=gymwebsite2; User=root; Password=commando;");
            cn.Open();
            string filename = Path.GetFileName(FileUploadControl.FileName);
            string fileuploadpath = Server.MapPath("~/userdata/" + theUserId + "/uploadedimage/") + filename);
            // error on this line filename only assignment, call can be used as a statement
            FileUploadControl.SaveAs(Server.MapPath(fileuploadpath));
            StatusLabel.Text = "Upload status: File uploaded!";

            OdbcCommand cmd = new OdbcCommand("INSERT INTO Pictures (UserID, picturepath) VALUES ('" + theUserId + "' , '" + fileuploadpath + "')", cn);
            cmd.ExecuteNonQuery();
        }

        catch (Exception ex)
        {
            StatusLabel.Text = "Upload status: The file could not be uploaded. The following error occured: " + ex.Message;

        }

    }
}

        }

如果我这样试试：

        string fileuploadpath = Server.MapPath("~/userdata/" + theUserId + "/uploadedimage/");
        FileUploadControl.SaveAs(Path.Combine(fileuploadpath, filename));

我得到一个mysql错误，因为没有文件名添加到路径的末尾（顺便说一句，我只是试图保存路径而不是图像）从技术上讲，我仍然可以将半个文件路径插入到sql中，所以也许这样使用上面的代码错误与我的原始上传方法无关。但显然我仍然需要完整的路径名。

无法上传文件。发生以下错误：错误[42000] [MySQL] [ODBC 3.51驱动程序] [mysqld-5.5.9]您的SQL语法中有错误;检查与MySQL服务器版本对应的手册，以便在第1行的“C：\ Users \ Garrith \ Documents \ Visual Studio 2010 \ WebSites \ WebSite1 \ userdata \ 1 \ uplo”附近使用正确的语法

Answer 1

您在同一个字符串上使用Server.MapPath两次。请从任何位置删除它，以便根据服务器映射的路径可能不会再次映射。

string fileuploadpath = Server.MapPath("~/userdata/" + theUserId + "/uploadedimage/") + filename);
FileUploadControl.SaveAs(Server.MapPath(fileuploadpath));

你可以这样做......

string fileuploadpath = Server.MapPath("~/userdata/" + theUserId + "/uploadedimage/") + filename);
FileUploadControl.SaveAs(fileuploadpath);

Answer 2

您收到此错误，因为您路径中的第一个字符是〜。您要做的是尝试删除此字符，然后将字符串保存在数据库中。

OdbcCommand cmd = new OdbcCommand("INSERT INTO Pictures (UserID, picturepath) VALUES ('" + theUserId + "' , '" + fileuploadpath.Substring(1,fileuploadpath.Length - 1) + "')", cn);

Answer 3

它可以设法自己做到这一点：

            //string filename = Path.GetFileName(FileUploadControl.FileName);
            string fileuploadpath = Server.MapPath("~/userdata/" + theUserId + "/uploadedimage/") + Path.GetFileName(FileUploadControl.FileName);
            FileUploadControl.SaveAs(fileuploadpath);
            StatusLabel.Text = "Upload status: File uploaded!";

            OdbcCommand cmd = new OdbcCommand("INSERT INTO Pictures (UserID, picturepath) VALUES ('" + theUserId + "' , '" + fileuploadpath + "')", cn);
            cmd.ExecuteNonQuery();
        }

        catch (Exception ex)
        {
            StatusLabel.Text = "Upload status: The file could not be uploaded. The following error occured: " + ex.Message;

        }

    }
}

        }

尝试将文件名添加到字符串结尾时出错：

3 个答案: