Question

在我的页面上，我想从代码后面向页面内的元素插入一个值。这是我的代码背后，我想添加每个标签或图像及其值没有gridview或listview或datalist。下面的代码需要更新，因为它不起作用，所以我帮助你们。

我必须创建一个屏幕记录，我已经更新了我的帖子，我希望能够解释我在寻找的内容： - ）

代码：

    protected void Page_Load(object sender, EventArgs e)
    {

        try {

            SqlConnection showads = new SqlConnection(cs);
            SqlCommand CMDshowads = new SqlCommand("SELECT * FROM ads where AdsID = @AID", showads);
            SqlDataReader adsdetread = CMDshowads.ExecuteReader();


            int i = 0;
    while (adsdetread.Read())
    {

        Image imgthum1 = new Image();
        imgthum1.ID = "Img1" + i;
        imgthum1.ImageUrl = adsdetread["Img1"].ToString();

        Image imgthum2 = new Image();
        imgthum2.ID = "Img2" + i;
        imgthum2.ImageUrl = adsdetread["Img2"].ToString();

        Image imgthum3 = new Image();
        imgthum3.ID = "Img3" + i;
        imgthum3.ImageUrl = adsdetread["Img1"].ToString();

        Image imgthum4 = new Image();
        imgthum4.ID = "Img4" + i;
        imgthum4.ImageUrl = adsdetread["Img2"].ToString();

        Image imgthum5 = new Image();
        imgthum5.ID = "Img5" + i;
        imgthum5.ImageUrl = adsdetread["Img1"].ToString();


        Label adstitledetailsshow = new Label();
        adstitledetailsshow.ID = "adstitledetailsshow" + i;
        adstitledetailsshow.Text = adsdetread["AdsTit"].ToString();

        Label Label1 = new Label();
        Label1.ID = "Label1" + i;
        Label1.Text = adsdetread["AdsID"].ToString();

        Label Label5 = new Label();
        Label5.ID = "Label5" + i;
        Label5.Text = adsdetread["AdsPrice"].ToString();

        Label Label11 = new Label();
        Label11.ID = "Label11" + i;
        Label11.Text = adsdetread["Website"].ToString();

        Label Label2 = new Label();
        Label2.ID = "Label2" + i;
        Label2.Text = adsdetread["Section"].ToString();

        Label Label4 = new Label();
        Label4.ID = "Label4" + i;
        Label4.Text = adsdetread["Category"].ToString();

        Label Label6 = new Label();
        Label6.ID = "Label6" + i;
        Label6.Text = adsdetread["Country"].ToString();

        Label Label7 = new Label();
        Label7.ID = "Label7" + i;
        Label7.Text = adsdetread["State"].ToString();

        Label Label8 = new Label();
        Label8.ID = "Label8" + i;
        Label8.Text = adsdetread["City"].ToString();

        Label Label3 = new Label();
        Label3.ID = "Label3" + i;
        Label3.Text = adsdetread["UID"].ToString();

        Label Label10 = new Label();
        Label10.ID = "Label10" + i;
        Label10.Text = adsdetread["AdsDate"].ToString();




        //add your controls here.

        container.Controls.Add(imgthum1);
        container.Controls.Add(imgthum2);
        container.Controls.Add(imgthum3);
        container.Controls.Add(imgthum4);
        container.Controls.Add(imgthum5);
        container.Controls.Add(Label1);
        container.Controls.Add(Label5);
        container.Controls.Add(Label11);
        container.Controls.Add(Label2);
        container.Controls.Add(Label4);
        container.Controls.Add(Label6);
        container.Controls.Add(Label7);
        container.Controls.Add(Label8);
        container.Controls.Add(Label3);
        container.Controls.Add(Label10);



        i++;
    }
  }
  catch 
  {
     adsdetreqLikeqpopup.Show();
  }
}

Answer 1

如果您不想使用其中一个ASP.NET转发器控件，那么您应该自己动态控制所有控件。所以基本上你首先需要一个容器用于你的控件，让我们说你的页面上有一个DIV标签（记得在那里添加runat和id属性）：

   <div runat="server" id="container"></div>

然后在while循环中你可以有这样的东西：

        int i = 0;
        while (adsdetread.Read())
        {
            //your images
            Image img1 = new Image();
            img1.ID = "img" + i;
            img1.ImageUrl = adsdetread["Img1"].ToString();

            Image img2 = new Image();
            img2.ID = "img" + i;
            img2.ImageUrl = adsdetread["Img2"].ToString();

            //rest of your images here

            //your labels
            Label lbl = new Label();
            lbl.ID = "lbl" + i;
            lbl.Text = adsdetread["AdsID"].ToString();

            Label lbl2 = new Label();
            lbl2.ID = "lbl" + i;
            lbl2.Text = adsdetread["AdsID"].ToString();

            //rest of your labels here


            //add your controls here.

            container.Controls.Add(img1);
            container.Controls.Add(img2);
            container.Controls.Add(lbl);
            container.Controls.Add(lbl2);

            //add the rest of your controls here

            i++;
        }

更新1：

在将字符串值分配给控件之前检查它们，您可以在每一行上执行类似的操作：

img1.ImageUrl = adsdetread["Img1"] != null ? adsdetread["Img1"].ToString() : string.Empty;

更新2：

你的sql命令中缺少一部分，你没有设置 AdsID 的值你的sql部分应该是这样的：

 using (var connection= new SqlConnection(cs))
 {
     using (var command = new SqlCommand())
     {
         command.Connection = connection;
         connection.Open();
         command.CommandText = "SELECT * FROM ads where AdsID = @AID";
         command.Parameters.AddWithValue("@AID", your value here);

         using (var reader = command.ExecuteReader())
         {
             int i = 0;
             while (reader.Read())
             {
                 //....
             }
         }
     }
  }

在没有listview的情况下难以绑定元素值

1 个答案: