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Asp.net回调技术Callback学习

作者：佚名      ASP.NET网站开发编辑：admin      更新时间：2022-07-23

asp.net回调技术Callback学习

.aspx:

Html代码收藏代码
  1. <%@PageLanguage="C#"AutoEventWireup="true"CodeFile="Default.aspx.cs"Inherits="_Default"%>
  3. <!DOCTYPEhtmlPUBLIC"-//W3C//DTDXHTML1.0Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
  4. <htmlxmlns="http://www.w3.org/1999/xhtml">
  5. <headrunat="server">
  6. <title>无标题页</title>
  8. <scripttype="text/javascript">
  10. //向服务器传递参数
  11. functionDoSearch(){
  12. varfirstName=document.getElementById("TextBox1").value;
  13. CallServer(firstName,"");
  14. }
  16. //得到服务器的数据
  17. functionReceiveServerData(txtUserInfo){
  18. Results.innerHTML=txtUserInfo;
  19. }
  21. //设置每1秒执行一次
  22. setInterval("DoSearch()",1000);
  23. </script>
  25. </head>
  26. <body>
  27. <formid="form1"runat="server">
  28. <div>
  29. 姓名:<asp:TextBoxID="TextBox1"runat="server"></asp:TextBox>
  30. <br/>
  31. <spanid="Results"style="width:500px;"></span>
  32. </div>
  33. </form>
  34. </body>
  35. </html>

.aspx.cs

C#代码收藏代码
  1. usingSystem;
  2. usingSystem.Collections;
  3. usingSystem.Configuration;
  4. usingSystem.Data;
  5. usingSystem.Web;
  6. usingSystem.Web.Security;
  7. usingSystem.Web.UI;
  8. usingSystem.Web.UI.HtmlControls;
  9. usingSystem.Web.UI.WebControls;
  10. usingSystem.Web.UI.WebControls.WebParts;
  11. usingSystem.Data.SqlClient;
  13. publicpartialclass_Default:System.Web.UI.Page,ICallbackEventHandler
  14. {
  15. PRotectedstringtxtUserInfo;
  18. protectedvoidPage_Load(objectsender,EventArgse)
  19. {
  20. //获取一个对客户端函数的引用
  21. stringcbReference=Page.ClientScript.GetCallbackEventReference(this,"arg","ReceiveServerData","context");
  22. //动态注册回调函数
  23. stringcallbackScript="functionCallServer(arg,context)"+"{"+cbReference+"};";
  24. //引发callbackScript
  25. Page.ClientScript.RegisterStartupScript(this.GetType(),"CallServer",callbackScript,true);
  26. }
  28. //引发Callback事件处理
  29. publicvoidRaiseCallbackEvent(stringtxtFirstName)
  30. {
  31. if(txtFirstName!=null)
  32. {
  33. StringconnString=System.Configuration.ConfigurationManager.ConnectionStrings["sqlserver2008"].ToString();
  35. SqlConnectionconn=newSqlConnection(connString);
  37. conn.Open();
  39. SqlCommandcomm=newSqlCommand("select*fromzzxwhere[name]=@name",conn);
  41. comm.Parameters.Add("@name",SqlDbType.VarChar).Value=txtFirstName;
  43. SqlDataReaderreader=comm.ExecuteReader(CommandBehavior.CloseConnection);
  44. if(reader.Read())
  45. {
  46. txtUserInfo="员工编号:"+reader["id"].ToString()+"<br>";
  47. txtUserInfo+="员工姓名:"+reader["name"].ToString()+"<br>";
  48. txtUserInfo+="地址:"+reader["address"].ToString()+"<br>";
  49. txtUserInfo+="服务器查询时间:"+DateTime.Now.ToString();
  50. }
  51. else
  52. {
  53. if(string.IsNullOrEmpty(txtFirstName))
  54. {
  55. txtUserInfo="请输入姓名";
  56. }
  57. else
  58. {
  59. txtUserInfo="查无此人";
  60. }
  61. }
  63. comm.Dispose();
  64. reader.Dispose();
  65. conn.Dispose();
  66. }
  67. }
  69. //得到回调的结果,返回给客户端
  70. publicstringGetCallbackResult()
  71. {
  72. returntxtUserInfo;
  73. }
  76. }

简化版(偷懒一下):

Html代码收藏代码
  1. <%@PageLanguage="C#"AutoEventWireup="true"CodeFile="Default.aspx.cs"Inherits="_Default"%>
  3. <!DOCTYPEhtmlPUBLIC"-//W3C//DTDXHTML1.0Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
  4. <htmlxmlns="http://www.w3.org/1999/xhtml">
  5. <headrunat="server">
  6. <title>无标题页</title>
  8. <scripttype="text/Javascript">
  9. functionOnCallBack(txtUserInfo,context){
  10. Results.innerHTML=txtUserInfo;
  11. }
  12. </script>
  14. </head>
  15. <body>
  16. <formid="form1"runat="server">
  17. <div>
  18. 姓名:<asp:TextBoxID="TextBox1"runat="server"></asp:TextBox>
  19. <inputid="Button2"type="button"value="button"
  20. onclick="<%=Page.ClientScript.GetCallbackEventReference(this,"document.getElementById('TextBox1').value","OnCallBack",null)%>"/>
  21. <br/>
  22. <spanid="Results"style="pink;width:500;"></span>
  23. </div>
  24. </form>
  25. </body>
  26. </html>

.aspx.cs

C#代码收藏代码
  1. usingSystem;
  2. usingSystem.Collections;
  3. usingSystem.Configuration;
  4. usingSystem.Data;
  5. usingSystem.Web;
  6. usingSystem.Web.Security;
  7. usingSystem.Web.UI;
  8. usingSystem.Web.UI.HtmlControls;
  9. usingSystem.Web.UI.WebControls;
  10. usingSystem.Web.UI.WebControls.WebParts;
  11. usingSystem.Data.SqlClient;
  12. usingSystem.Text;
  13. publicpartialclass_Default:System.Web.UI.Page,ICallbackEventHandler
  14. {
  15. protectedStringBuildertxtUserInfo;
  17. protectedvoidPage_Load(objectsender,EventArgse)
  18. {
  20. }
  22. publicstringGetCallbackResult()
  23. {
  24. returntxtUserInfo.ToString();
  25. }
  27. publicvoidRaiseCallbackEvent(stringtxtFirstName)
  28. {
  29. txtUserInfo=newStringBuilder();
  30. StringconnString=ConfigurationManager.ConnectionStrings["sqlserver2008"].ToString();
  31. SqlConnectionconn=newSqlConnection(connString);
  32. conn.Open();
  33. SqlCommandcomm=newSqlCommand("select*fromzzxwhere[name]=@name",conn);
  34. comm.Parameters.Add("@name",SqlDbType.VarChar).Value=txtFirstName;
  35. SqlDataReaderreader=comm.ExecuteReader(CommandBehavior.CloseConnection);
  36. if(reader.Read())
  37. {
  38. txtUserInfo.Append("员工编号:"+reader["id"].ToString()+"<br>");
  39. txtUserInfo.Append("员工姓名:"+reader["name"].ToString()+"<br>");
  40. txtUserInfo.Append("地址:"+reader["address"].ToString()+"<br>");
  41. txtUserInfo.Append("查询时间:"+DateTime.Now.ToString());
  42. }
  43. else
  44. {
  45. if(txtFirstName==string.Empty)
  46. {
  47. txtUserInfo.Append("请输入姓名");
  48. }
  49. else
  50. {
  51. txtUserInfo.Append("查无此人");
  52. }
  53. reader.Dispose();
  54. comm.Dispose();
  55. conn.Dispose();
  56. }
  59. }
  60. }

示例3:

Html代码收藏代码
  1. <%@PageLanguage="C#"AutoEventWireup="true"CodeFile="Default3.aspx.cs"Inherits="Default3"%>
  3. <!DOCTYPEhtmlPUBLIC"-//W3C//DTDXHTML1.0Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
  5. <htmlxmlns="http://www.w3.org/1999/xhtml">
  6. <headrunat="server">
  7. <title>无标题页</title>
  8. <scripttype="text/javascript">
  9. //客户端执行的方法
  10. //下面的方法是接收并处理服务器方法返回的结果
  11. functionSuccess(args,context){
  12. message.innerHTML=args;
  13. }
  15. //下面的方式是当接收服务器方法处理的结果发生异常时调用的方法
  16. functionError(){
  17. message.innerHTML="发生了异常!";
  18. }
  19. </script>
  20. </head>
  21. <body>
  22. <formid="form1"runat="server">
  23. <div>
  24. 用户名:<inputtype="text"id="txtUserName"onblur="CallServerMethod(txtUserName.value,nu