zoukankan      html  css  js  c++  java
  • DropDownList 控件控制Image控件动态显示图像

    using System;
    using System.Data;
    using System.Configuration;
    using System.Web;
    using System.Web.Security;
    using System.Web.UI;
    using System.Web.UI.WebControls;
    using System.Web.UI.WebControls.WebParts;
    using System.Web.UI.HtmlControls;
    using System.Data.SqlClient;

    public partial class _Default : System.Web.UI.Page
    {
        SqlConnection sqlcon;
        string strCon = "Data Source=(local);Database=db_04;Uid=sa;Pwd=";
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                sqlcon = new SqlConnection(strCon);
                sqlcon.Open();
                string sqlstr = "select * from tb_Image";
                SqlDataAdapter myda = new SqlDataAdapter(sqlstr, sqlcon);
                DataSet myds = new DataSet();
                myda.Fill(myds, "tb_Image");
                ddlPhoto.DataSource = myds.Tables["tb_Image"];
                ddlPhoto.DataTextField = "Image";
                ddlPhoto.DataBind();
                imgPhoto.ImageUrl = ddlPhoto.SelectedValue;
                sqlcon.Close();
            }
        }
        protected void ddlPhoto_SelectedIndexChanged(object sender, EventArgs e)
        {
            imgPhoto.ImageUrl = ddlPhoto.SelectedValue;
        }
    }
    SelectedIndexChanged 事件 当列表控件中的选择在向服务器的发送过程中更改时会引发这个事件 记得 DropDownList的AutoPostBack属性要为True

  • 相关阅读:
    344. 反转字符串
    942. 增减字符串匹配
    CGO内部机制
    CGO函数调用
    CGO类型转换
    CGO基础
    Go net/http代理
    GO-中间件(Middleware )
    Go如何巧妙使用runtime.SetFinalizer
    ARM基础
  • 原文地址:https://www.cnblogs.com/ivy/p/1214819.html
Copyright © 2011-2022 走看看