Question

对于一般的编码，我是一个相当新的人，如果我的一些行话有误，那就很抱歉。

我有一个数据库，用于存储我主页的文件图像名称，以便管理员可以上传新图像以替换数据库中的先前图像，以便将新上传的图像发布到主页。

我目前遇到的问题是，当我只是想更新其中一个图像时，它会上传该图像，但其他图像会被替换为空值，我只希望我上传图像的字段更新

这是我背后的代码，我很清楚我做错了什么，但是，我现在还不知道如何解决我的问题。任何帮助将不胜感激。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

using System.IO;
using System.Data;
using System.Data.SqlClient;
using System.Web.Configuration;

public partial class admin_updatehomepage : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void displayedit_ItemUpdated(object sender, ListViewUpdatedEventArgs e)
    {
        info.Text = "Item Updated";

        FileUpload fileupdate1 = displayedit.EditItem.FindControl("imageupdate1") as FileUpload;
        FileUpload fileupdate2 = displayedit.EditItem.FindControl("imageupdate2") as FileUpload;
        FileUpload fileupdate3 = displayedit.EditItem.FindControl("imageupdate3") as FileUpload;
        FileUpload fileupdate4 = displayedit.EditItem.FindControl("imageupdate4") as FileUpload;
        FileUpload fileupdate5 = displayedit.EditItem.FindControl("imageupdate5") as FileUpload;
        FileUpload fileupdate6 = displayedit.EditItem.FindControl("imageupdate6") as FileUpload;
        FileUpload fileupdate7 = displayedit.EditItem.FindControl("imageupdate7") as FileUpload;
        FileUpload fileupdate8 = displayedit.EditItem.FindControl("imageupdate8") as FileUpload;
        FileUpload fileupdate9 = displayedit.EditItem.FindControl("imageupdate9") as FileUpload;

        Label recordid = displayedit.EditItem.FindControl("idlabel1") as Label;
        Int32 id = Convert.ToInt32(recordid.Text);

        if (fileupdate1.HasFile)
        {
            String fupload = fileupdate1.FileName;

            Random r = new Random();
            int rInt = r.Next(0, 10000);

            String imgpath = "../images/" + rInt + fupload;

            fileupdate1.SaveAs(Server.MapPath(imgpath));

            String newimage = rInt + fupload;

            string newsconnection = WebConfigurationManager.ConnectionStrings["newsconnection"].ConnectionString;
            SqlConnection myConnection = new SqlConnection(newsconnection);

            //myConnection.ConnectionString is now set to connectionString.
            myConnection.Open();

            String query = "UPDATE homepage SET fballimg ='" + newimage + "' WHERE id='" + id + "'";

            SqlCommand myCommand = new SqlCommand(query, myConnection);

            myCommand.ExecuteNonQuery();
            myConnection.Close();
        }
        if (fileupdate2.HasFile)
        {
            String fupload = fileupdate2.FileName;

            Random r = new Random();
            int rInt = r.Next(0, 10000);

            String imgpath = "../images/" + rInt + fupload;

            fileupdate2.SaveAs(Server.MapPath(imgpath));

            String newimage = rInt + fupload;

            string newsconnection = WebConfigurationManager.ConnectionStrings["newsconnection"].ConnectionString;
            SqlConnection myConnection = new SqlConnection(newsconnection);

            //myConnection.ConnectionString is now set to connectionString.
            myConnection.Open();

            String query = "UPDATE homepage SET rugbyimg ='" + newimage + "' WHERE id='" + id + "'";

            SqlCommand myCommand = new SqlCommand(query, myConnection);

            myCommand.ExecuteNonQuery();
            myConnection.Close();
        }
        if (fileupdate3.HasFile)
        {
            String fupload = fileupdate3.FileName;

            Random r = new Random();
            int rInt = r.Next(0, 10000);

            String imgpath = "../images/" + rInt + fupload;

            fileupdate3.SaveAs(Server.MapPath(imgpath));

            String newimage = rInt + fupload;

            string newsconnection = WebConfigurationManager.ConnectionStrings["newsconnection"].ConnectionString;
            SqlConnection myConnection = new SqlConnection(newsconnection);

            //myConnection.ConnectionString is now set to connectionString.
            myConnection.Open();

            String query = "UPDATE homepage SET bballimg ='" + newimage + "' WHERE id='" + id + "'";

            SqlCommand myCommand = new SqlCommand(query, myConnection);

            myCommand.ExecuteNonQuery();
            myConnection.Close();
        }
    }
    protected void displayedit_ItemEditing(object sender, ListViewEditEventArgs e)
    {
        info.Text = "<b>*Recommend images are 490px x 190px(or of similar ratio) to avoid image distortion</b>";
    }
    protected void displayedit_ItemCanceling(object sender, ListViewCancelEventArgs e)
    {
        info.Text = "Not Updating";
    }
}

Answer 1

试试这个......

将每个图像的名称存储在不同的隐藏字段中....

现在更新时检查：

if (fileupdateId.HasFile)
{
    //then new file name
}
else
{
   //else hiddenfield value
}

如果有任何疑问，请告诉我..

ASP.net C＃如何使更新页面中的数据库更新中只有一个字段

1 个答案: