这个简易的留言板，是通过手机客户端与web程序的交互来设计的，保存留言的时候将数据传输到web，显示留言的时候再从数据库取数通过web传输到客户端。加强对HttpWebRequest异步请求的学习。

 

 

 

1. <phone:PhoneApplicationPage   
2.     x:Class="WindowsPhoneLiuyan.MainPage" 
3.     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
4.     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
5.     xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone" 
6.     xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone" 
7.     xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
8.     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
9.     xmlns:Data="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data" 
10.     mc:Ignorable="d" d:DesignWidth="480" d:DesignHeight="768" 
11.     FontFamily="{StaticResource PhoneFontFamilyNormal}" 
12.     FontSize="{StaticResource PhoneFontSizeNormal}" 
13.     Foreground="{StaticResource PhoneForegroundBrush}" 
14.     SupportedOrientations="Portrait" Orientation="Portrait" 
15.     shell:SystemTray.IsVisible="True"> 
16.  
17.     <!--LayoutRoot is the root grid where all page content is placed--> 
18.     <Grid x:Name="LayoutRoot" Background="Transparent"> 
19.         <Grid.RowDefinitions> 
20.             <RowDefinition Height="Auto"/> 
21.             <RowDefinition Height="*"/> 
22.         </Grid.RowDefinitions> 
23.  
24.         <!--TitlePanel contains the name of the application and page title--> 
25.         <StackPanel x:Name="TitlePanel" Grid.Row="0" Margin="12,17,0,28"> 
26.             <TextBlock x:Name="PageTitle" Text="网络留言板" Margin="9,-7,0,0" Style="{StaticResource PhoneTextTitle1Style}"/> 
27.         </StackPanel> 
28.  
29.         <!--ContentPanel - place additional content here--> 
30.         <Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0"> 
31.             <Canvas  Height="600" Margin="0,4,6,4"> 
32.                 <TextBlock x:Name="name1" Canvas.Top="327" Canvas.Left="8" Text="网   名：" Foreground="#FFF7F6F6"/> 
33.                 <TextBox x:Name="name" Width="122" Canvas.Left="86" Canvas.Top="308" Background="#FFFBF6F6"/> 
34.                 <TextBlock x:Name="message1" Canvas.Left="11" Canvas.Top="360" Text="留 言：" Foreground="#FFFBF9F9"/> 
35.                 <TextBox x:Name="message" Width="321" Canvas.Left="86" Canvas.Top="360" VerticalScrollBarVisibility="Hidden" Height="124"/> 
36.                 <Button Canvas.Left="30" Canvas.Top="490" Content="保存" Height="71" Name="save" Width="160" Click="save_Click" /> 
37.                 <Button Canvas.Left="217" Canvas.Top="490" Content="重置" Height="71" Name="reset" Width="160" Click="reset_Click" /> 
38.                 <TextBox Canvas.Left="-4" Canvas.Top="6" Height="296" Name="messages" Text="TextBox" Width="460" AcceptsReturn="True" /> 
39.             </Canvas> 
40.         </Grid> 
41.     </Grid> 
42. </phone:PhoneApplicationPage> 

 

1. using System;  
2. using System.Collections.Generic;  
3. using System.Linq;  
4. using System.Net;  
5. using System.Windows;  
6. using System.Windows.Controls;  
7. using System.Windows.Documents;  
8. using System.Windows.Input;  
9. using System.Windows.Media;  
10. using System.Windows.Media.Animation;  
11. using System.Windows.Shapes;  
12. using Microsoft.Phone.Controls;  
13. using System.Text;  
14. using System.IO;  
15. using System.Collections.ObjectModel;  
16.  
17. namespace WindowsPhoneLiuyan  
18. {  
19.     public partial class MainPage : PhoneApplicationPage  
20.     {  
21.         public MainPage()  
22.         {  
23.             InitializeComponent();  
24.             getMessage();  
25.         }  
26.  
27.         private void save_Click(object sender, RoutedEventArgs e)  
28.         {  
29.             UriBuilder fullUri = new UriBuilder("http://localhost/liuyan/messege.ashx");  
30.             fullUri.Query = "type=insert&name=" + name.Text + "&description=" + message.Text;  
31.             // 创建WebRequest  
32.             HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(fullUri.Uri);  
33.             // 创建同步的AsyncRequest  
34.             UpdateState State = new UpdateState();  
35.             State.AsyncRequest = myRequest;  
36.             // 开始异步请求  
37.             myRequest.BeginGetResponse(new AsyncCallback(HandleMyResponse), State);  
38.         }  
39.  
40.         public void getMessage()  
41.         {  
42.             UriBuilder fullUri = new UriBuilder("http://localhost/liuyan/messege.ashx");  
43.             fullUri.Query = "type=get";  
44.             // 创建WebRequest  
45.             HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(fullUri.Uri);  
46.             // 创建同步的AsyncRequest  
47.             UpdateState State = new UpdateState();  
48.             State.AsyncRequest = myRequest;  
49.             // 开始异步请求  
50.             myRequest.BeginGetResponse(new AsyncCallback(HandleMyResponse), State);  
51.         }  
52.  
53.         private void HandleMyResponse(IAsyncResult asyncResult)  
54.         {  
55.             // 获取返回的信息  
56.             UpdateState myState = (UpdateState)asyncResult.AsyncState;  
57.             HttpWebRequest myRequest = (HttpWebRequest)myState.AsyncRequest;  
58.             //结束异步请求  
59.             myState.AsyncResponse = (HttpWebResponse)myRequest.EndGetResponse(asyncResult);  
60.             Stream streamResult = myState.AsyncResponse.GetResponseStream();  
61.  
62.             Deployment.Current.Dispatcher.BeginInvoke(() => 
63.             {  
64.                 if (streamResult.Length != 0)  
65.                 {  
66.                     StreamReader sr = new StreamReader(streamResult);  
67.                     messages.Text = sr.ReadToEnd();  
68.                 }  
69.             });  
70.         }  
71.  
72.         private void reset_Click(object sender, RoutedEventArgs e)  
73.         {  
74.             name.Text = "";  
75.             message.Text = "";  
76.         }  
77.  
78.     }  
79.  
80.     public class UpdateState  
81.     {  
82.         public HttpWebRequest AsyncRequest { get; set; }  
83.         public HttpWebResponse AsyncResponse { get; set; }  
84.     }  
85. } 

web依然使用.NET

Message.ashx文件

 

1. using System;  
2. using System.Collections.Generic;  
3. using System.Linq;  
4. using System.Web;  
5. using System.Data.OleDb;  
6. using System.Data;  
7.  
8. namespace liuyan.Web  
9. {  
10.     /// <summary> 
11.     /// Messege 的摘要说明  
12.     /// </summary> 
13.     public class Message : IHttpHandler  
14.     {  
15.  
16.         public void ProcessRequest(HttpContext context)  
17.         {  
18.             context.Response.ContentType = "text/plain";  
19.             string type = context.Request.QueryString["type"].ToString();  
20.             switch (type)  
21.             {  
22.                 case "get":  
23.                     get(context);  
24.                     break;  
25.                 case "insert":  
26.                     insert(context);  
27.                     break;  
28.                 default:  
29.                     break;  
30.             }  
31.         }  
32.         /// <summary> 
33.         /// 获取留言板数据  
34.         /// </summary> 
35.         /// <param name="context"></param> 
36.         public void get(HttpContext context)  
37.         {  
38.             string messages = "";  
39.             OleDbCommand cmd = new OleDbCommand();  
40.             SQLExcute("SELECT * from about order by id desc", cmd);  
41.             OleDbDataAdapter da = new OleDbDataAdapter();  
42.             da.SelectCommand = cmd;  
43.             DataSet ds = new DataSet();  
44.             da.Fill(ds);  
45.  
46.             foreach (DataRow dr in ds.Tables[0].Rows)  
47.             {  
48.                 messages += dr[1] + " say：" + dr[2]+" ";  
49.             }  
50.  
51.             context.Response.Write(messages.ToString());  
52.         }  
53.         /// <summary> 
54.         /// 先往access数据库插入数据  然后再查询返回数据  
55.         /// </summary> 
56.         /// <param name="context"></param> 
57.         public void insert(HttpContext context)  
58.         {  
59.             string name = context.Request.QueryString["name"].ToString();  
60.             string description = context.Request.QueryString["description"].ToString();  
61.             string sql = "insert into about(name,description) values('" + name + "','" + description + "')";  
62.             SQLExcute(sql);  
63.             string messages = "";  
64.             OleDbCommand cmd = new OleDbCommand();  
65.             SQLExcute("SELECT * from about order by id desc", cmd);  
66.             OleDbDataAdapter da = new OleDbDataAdapter();  
67.             da.SelectCommand = cmd;  
68.             DataSet ds = new DataSet();  
69.             da.Fill(ds);  
70.  
71.             foreach (DataRow dr in ds.Tables[0].Rows)  
72.             {  
73.                 messages += "("+dr[1]+")" + " say：" + dr[2];  
74.             }  
75.  
76.             context.Response.Write(messages.ToString());  
77.         }  
78.         //SQL的操作     
79.         private void SQLExcute(string SQLCmd)  
80.         {  
81.             string ConnectionString = "PROVIDER=Microsoft.Jet.OLEDB.4.0;DATA SOURCE=D:\\code\\Message\\App_Data\\information.mdb";  
82.             OleDbConnection conn = new OleDbConnection(ConnectionString);  
83.             conn.Open();  
84.             OleDbCommand cmd = new OleDbCommand();  
85.             cmd.Connection = conn;  
86.             cmd.CommandTimeout = 15;  
87.             cmd.CommandType = CommandType.Text;  
88.             cmd.CommandText = SQLCmd;  
89.             cmd.ExecuteNonQuery();  
90.             conn.Close();  
91.         }  
92.         //SQL的操作 是SQLExcute的重构  
93.         private void SQLExcute(string SQLCmd, OleDbCommand Cmd)  
94.         {  
95.             string ConnectionString = "PROVIDER=Microsoft.Jet.OLEDB.4.0;DATA SOURCE=D:\\code\\Message\\App_Data\\information.mdb";  
96.             OleDbCommand cmd = new OleDbCommand();  
97.             OleDbConnection Conn = new OleDbConnection(ConnectionString);  
98.             Conn.Open();  
99.             Cmd.Connection = Conn;  
100.             Cmd.CommandTimeout = 15;  
101.             Cmd.CommandType = CommandType.Text;  
102.             Cmd.CommandText = SQLCmd;  
103.             Cmd.ExecuteNonQuery();  
104.             Conn.Close();  
105.         }  
106.         public bool IsReusable  
107.         {  
108.             get  
109.             {  
110.                 return false;  
111.             }  
112.         }  
113.     }  
114. } 

 

本文转自linzheng 51CTO博客，原文链接:http://blog.51cto.com/linzheng/1078692