[索引页]
[源码下载]
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://webabcd.blog.51cto.com/1787395/342779
示例
1、以字符串的形式和流的形式下载数据
WebClientDownload.xaml
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（包括取消操作及有错误发生时）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 - 该异步操作期间是否发生了错误
* DownloadStringCompletedEventArgs.Cancelled - 该异步操作是否已被取消
* 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() - 取消指定的异步操作
* OpenReadCompleted - 数据读取完毕后（包括取消操作及有错误发生时）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, 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());
progressBarStream.Value = (double)e.ProgressPercentage;
}
void clientDownloadStream_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
{
/*
* OpenReadCompletedEventArgs.Error - 该异步操作期间是否发生了错误
* OpenReadCompletedEventArgs.Cancelled - 该异步操作是否已被取消
* 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;
}
}
}
}
[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://webabcd.blog.51cto.com/1787395/342779
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>
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（包括取消操作及有错误发生时）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 - 该异步操作期间是否发生了错误 * DownloadStringCompletedEventArgs.Cancelled - 该异步操作是否已被取消 * 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() - 取消指定的异步操作 * OpenReadCompleted - 数据读取完毕后（包括取消操作及有错误发生时）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, 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()); progressBarStream.Value = (double)e.ProgressPercentage; } void clientDownloadStream_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e) { /* * OpenReadCompletedEventArgs.Error - 该异步操作期间是否发生了错误 * OpenReadCompletedEventArgs.Cancelled - 该异步操作是否已被取消 * 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; } } } }
OK
[源码下载]
[源码下载]
本文转自webabcd 51CTO博客，原文链接：
http://blog.51cto.com/webabcd/343127
，如需转载请自行联系原作者
