[源码下载]
稳扎稳打Silverlight(20) - 2.0通信之WebClIEnt,以字符串的形式上传/下载数据,以流的方式上传/下载数据
作者：webabcd
介绍
Silverlight 2.0 详解WebClIEnt，以字符串的形式上传、下载数据；以流的方式上传、下载数据
WebClIEnt - 将数据发送到指定的 URI，或者从指定的 URI 接收数据的类
DownloadStringAsync(Uri address,Object userToken) - 以字符串的形式下载指定的 URI 的资源
UploadStringAsync(Uri address,string data) - 以字符串的形式上传数据到指定的 URI。所使用的 http 方法默认为 POST
OpenReadAsync(Uri address,Object userToken) - 以流的形式下载指定的 URI 的资源
OpenWriteAsync(Uri address,string method,Object userToken) - 打开流以使用指定的方法向指定的 URI 写入数据
在线DEMO
http://www.voidcn.com/article/p-ounmxjds-tq.html
示例
1、以字符串的形式和流的形式下载数据
WebClIEntDownload.xaml <UserControl x:Class="Silverlight20.Communication.WebClIEntDownload"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<StackPanel HorizontalAlignment="left" OrIEntation="Horizontal">
<StackPanel margin="5" WIDth="200">
<TextBox x:name="lblMsgString" margin="5" />
<Progressbar x:name="progressbarString" Height="20" margin="5" Minimum="0" Maximum="100" />
</StackPanel>
<StackPanel margin="5" WIDth="200">
<TextBox x:name="lblMsgStream" margin="5" />
<Progressbar x:name="progressbarStream" Height="20" margin="5" Minimum="0" Maximum="100" />
<Image x:name="img" margin="5" />
</StackPanel>
</StackPanel>
</UserControl> WebClIEntDownload.xaml.cs using System;
using System.Collections.Generic;
using System.linq;
using System.Net;
using System.windows;
using System.windows.Controls;
using System.windows.documents;
using System.windows.input;
using System.windows.Media;
using System.windows.Media.Animation;
using System.windows.Shapes;
using System.IO;
namespace Silverlight20.Communication
{
public partial class WebClIEntDownload : UserControl
{
// 用于演示以字符串的形式下载数据
string _urlString = "http://localhost/files/Demo.zip";
// 用于演示以流的形式下载数据
string _urlStream = "http://localhost/files/logo.png";
public WebClIEntDownload()
{
InitializeComponent();
// 演示字符串式下载
DownloadStringDemo();
// 演示流式下载
DownloadStreamDemo();
}
/// <summary>
/// 演示字符串式下载
/// </summary>
voID DownloadStringDemo()
{
Uri uri = new Uri(_urlString,UriKind.absolute);
/*
* WebClIEnt - 将数据发送到指定的 URI，或者从指定的 URI 接收数据的类
* DownloadStringCompleted - 下载数据完毕后（包括取消 *** 作及有错误发生时）所触发的事件
* DownloadProgressChanged - 下载数据过程中所触发的事件。正在下载或下载完全部数据后会触发
* DownloadStringAsync(Uri address,Object userToken) - 以字符串的形式下载指定的 URI 的资源
* Uri address - 需要下载的资源地址
* Object userToken - 用户标识
*/
System.Net.WebClIEnt clIEntDownloadString = new System.Net.WebClIEnt();
clIEntDownloadString.DownloadStringCompleted += new DownloadStringCompletedEventHandler(clIEntDownloadString_DownloadStringCompleted);
clIEntDownloadString.DownloadProgressChanged += new DownloadProgressChangedEventHandler(clIEntDownloadString_DownloadProgressChanged);
clIEntDownloadString.DownloadStringAsync(uri,"userToken");
}
voID clIEntDownloadString_DownloadProgressChanged(object sender,DownloadProgressChangedEventArgs e)
{
/*
* DownloadProgressChangedEventArgs.Progresspercentage - 下载完成的百分比
* DownloadProgressChangedEventArgs.BytesReceived - 当前收到的字节数
* DownloadProgressChangedEventArgs.TotalBytesToReceive - 总共需要下载的字节数
* DownloadProgressChangedEventArgs.UserState - 用户标识
*/
lblMsgString.Text = string.Format("下载完成的百分比：{0}\r\n当前收到的字节数：{1}\r\n总共需要下载的字节数：{2}\r\n",
e.Progresspercentage.ToString() + "%",
e.BytesReceived.ToString(),
e.TotalBytesToReceive.ToString());
progressbarString.Value = (double)e.Progresspercentage;
}
voID clIEntDownloadString_DownloadStringCompleted(object sender,DownloadStringCompletedEventArgs e)
{
/*
* DownloadStringCompletedEventArgs.Error - 该异步 *** 作期间是否发生了错误
* DownloadStringCompletedEventArgs.Cancelled - 该异步 *** 作是否已被取消
* DownloadStringCompletedEventArgs.Result - 下载后的字符串类型的数据
* DownloadStringCompletedEventArgs.UserState - 用户标识
*/
if (e.Error != null)
{
lblMsgString.Text += e.Error.ToString();
return;
}
if (e.Cancelled != true)
{
lblMsgString.Text += string.Format("用户标识：{0}",e.UserState.ToString());
}
}
/// <summary>
/// 演示流式下载
/// </summary>
voID DownloadStreamDemo()
{
Uri uri = new Uri(_urlStream,UriKind.absolute);
/*
* WebClIEnt - 将数据发送到指定的 URI，或者从指定的 URI 接收数据的类
* IsBusy - 指定的web请求是否正在进行中
* CancelAsync() - 取消指定的异步 *** 作
* OpenReadCompleted - 数据读取完毕后（包括取消 *** 作及有错误发生时）所触发的事件。流的方式
* DownloadProgressChanged - 下载数据过程中所触发的事件。正在下载或下载完全部数据后会触发
* OpenReadAsync(Uri address,Object userToken) - 以流的形式下载指定的 URI 的资源
* Uri address - 需要下载的资源地址
* Object userToken - 用户标识
*/
System.Net.WebClIEnt clIEntDownloadStream = new System.Net.WebClIEnt();
if (clIEntDownloadStream.IsBusy)
clIEntDownloadStream.CancelAsync();
clIEntDownloadStream.OpenReadCompleted += new OpenReadCompletedEventHandler(clIEntDownloadStream_OpenReadCompleted);
clIEntDownloadStream.DownloadProgressChanged += new DownloadProgressChangedEventHandler(clIEntDownloadStream_DownloadProgressChanged);
clIEntDownloadStream.OpenReadAsync(uri);
}
voID clIEntDownloadStream_DownloadProgressChanged(object sender,
e.TotalBytesToReceive.ToString());
progressbarStream.Value = (double)e.Progresspercentage;
}
voID clIEntDownloadStream_OpenReadCompleted(object sender,OpenReadCompletedEventArgs e)
{
/*
* OpenReadCompletedEventArgs.Error - 该异步 *** 作期间是否发生了错误
* OpenReadCompletedEventArgs.Cancelled - 该异步 *** 作是否已被取消
* OpenReadCompletedEventArgs.Result - 下载后的 Stream 类型的数据
* OpenReadCompletedEventArgs.UserState - 用户标识
*/
if (e.Error != null)
{
lblMsgStream.Text += e.Error.ToString();
return;
}
if (e.Cancelled != true)
{
System.windows.Media.Imaging.BitmAPImage imageSource = new System.windows.Media.Imaging.BitmAPImage();
imageSource.SetSource(e.Result);
img.source = imageSource;
}
}
}
} 未完待续>> OK
[源码下载] 总结
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