能否帮忙给个教材参考下怎么做~本来我是执行查询按钮,实现数据库查询,数据量大所以需要定时执行
4条回答 默认 最新
- Moluth 2016-08-12 02:04关注
使用timer,以前写过一个网页版简单聊天功能,实现原理是1s中对页面的局部刷新一次,你自己看吧,代码如下:
.aspx文件:<body> <form id="form1" runat="server"> <div> <div> <a href="HomePage.aspx">首页</a> <a href="UserPage.aspx">个人中心</a><a href="#">退出登录</a> </div> <h1>和<%=user2 %>聊天中……</h1><hr /> <asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager> <asp:Panel ID="Panel1" runat="server" BorderStyle="Solid" BorderColor="#66CCFF" BorderWidth="3px" ScrollBars="Vertical" Height="400px" Width="600px"> <asp:UpdatePanel ID="UpdatePanel1" runat="server"> <ContentTemplate> <asp:Timer ID="Timer1" runat="server" OnTick="Timer1_Tick" Interval="1000"></asp:Timer> <div runat="server" id="div1" style="width:550px; clear:both;">aaaa</div> </ContentTemplate> </asp:UpdatePanel> </asp:Panel> <asp:UpdatePanel ID="UpdatePanel2" runat="server" UpdateMode="Conditional"> <ContentTemplate> <asp:TextBox ID="TextBox1" runat="server" Width="550px" MaxLength="40"></asp:TextBox> <asp:Button ID="Button1" runat="server" Text="发送" OnClick="Button1_Click" /> </ContentTemplate> </asp:UpdatePanel> </div> </form> </body>
.cs文件
using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using System.Data; using DataBaseConnection; public partial class UserChat : System.Web.UI.Page { public string user1, user2; protected void Page_Load(object sender, EventArgs e) { if(Session["UserName"].ToString().Length == 0) Response.Redirect("HomePage.aspx"); user1=Session["UserName"].ToString(); if (Request.QueryString["uid"]!=null) user2 = Request.QueryString["uid"].ToString(); else Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "", "<script>alert('对不起,意外的错误!');window.location='HomePage.aspx';</script>"); Timer1.Enabled = true; if (!Partone.userExist(user2)) { Timer1.Enabled = false; Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "", "<script>alert('对方账号不存在!');window.location='HomePage.aspx'</script>"); return; } else { Timer1.Enabled = true; } } protected void Button1_Click(object sender, EventArgs e) { if (!Partone.userExist(user2)) { Timer1.Enabled = false; Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "", "<script>alert('对方账号不存在!');window.location='HomePage.aspx'</script>"); return; } else { Timer1.Enabled = true; } if (TextBox1.Text.Length == 0) return; UsersChat.insertChat(user1, user2, TextBox1.Text); TextBox1.Text = ""; } protected void Timer1_Tick(object sender, EventArgs e) { div1.InnerHtml = ""; DataTable dtb = UsersChat.getChat(user1, user2); int max = 20; if (dtb.Rows.Count < max) max = dtb.Rows.Count; for (int i = max - 1; i >= 0; i--) { if (user1.Equals(dtb.Rows[i]["CUser1"].ToString())) { string htm1 = "<div style=\"color:#22ff33; font-size:18px; text-align:right\">" + user1 + " " + dtb.Rows[i]["ChatDT"] + "</div>"; string htm2 = "<div style=\"font-size:22px; text-align:right;\">" + dtb.Rows[i]["ChatContent"] + "</div>"; div1.InnerHtml += htm1; div1.InnerHtml += htm2; } else { string htm1 = "<div style=\"color:#2233ff; font-size:18px;\">" + user2 + " " + dtb.Rows[i]["ChatDT"] + "</div>"; string htm2 = "<div style=\"font-size:22px;\">" + dtb.Rows[i]["ChatContent"] + "</div>"; div1.InnerHtml += htm1; div1.InnerHtml += htm2; } } } }
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