通过本文主要向大家介绍了silverlight,silverlight下载,silverlight是什么,silverlight安装失败,silverlight插件等相关知识,希望对您有所帮助,也希望大家支持linkedu.com www.linkedu.com
search了非常多的文章，总算勉强实现了。有许多不完善的地方。
在HCLoad.Web项目下新建目录Pics复制一张图片到根目录下。
图片名：Bubble.jpg 右击->属性->生成操作：Resource
UC_UpDown.xaml
<UserControl x:Class="HCLoad.UC_UpDown"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Width="500" Height="500">
<StackPanel Background="White" Height="450">
<Button Content="down" Click="Button_Click"></Button>
<HyperlinkButton Content="下载保存" NavigateUri="http://localhost:4528/download.ashx?fileName=aa.txt" TargetName="_self" x:Name="lBtnDown" />
<TextBlock x:Name="tbMsgString" Text="下载进度" TextAlignment="Center" Foreground="Green"></TextBlock>
<Button x:Name="btnDownload" Content="DownLoad Pictures" Width="150" Height="35" Margin="15" Click="btnDownload_Click"/>
<Border Background="Wheat" BorderThickness="5" Width="400" Height="280">
<Image x:Name="imgDownLoad" Width="400" Height="300" Margin="15" Stretch="Fill"/>
</Border>
<Button x:Name="btnUpLoad" Content="UpLoad Pictures" Width="150" Height="35" Margin="15" Click="btnUpLoad_Click"/>
</StackPanel>
</UserControl>
</div>
UC_UpDown.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.Windows.Media.Imaging; //因为要使用BitmapImage
using System.IO; //因为要使用Stream
namespace HCLoad
{
public partial class UC_UpDown : UserControl
{
//1、WebClient 对象一次只能启动一个请求。如果在一个请求完成（包括出错和取消）前，即IsBusy为true时，进行第二个请求，则第二个请求将会抛出 NotSupportedException 类型的异常
//2、如果 WebClient 对象的 BaseAddress 属性不为空，则 BaseAddress 与 URI（相对地址） 组合在一起构成绝对 URI
//3、WebClient 类的 AllowReadStreamBuffering 属性：是否对从 Internet 资源接收的数据做缓冲处理。默认值为true，将数据缓存在客户端内存中，以便随时被应用程序读取
//获取选定图片信息
System.IO.FileInfo fileinfo;
public UC_UpDown()
{
InitializeComponent();
}
#region 下载图片
private void btnDownload_Click(object sender, RoutedEventArgs e)
{
//向指定的Url发送下载流数据请求
String imgUrl = "http://localhost:4528/Bubble.jpg";
Uri endpoint = new Uri(imgUrl);
WebClient client = new WebClient();
client.OpenReadCompleted += new OpenReadCompletedEventHandler(OnOpenReadCompleted);
client.DownloadProgressChanged += new DownloadProgressChangedEventHandler(clientDownloadStream_DownloadProgressChanged);
client.OpenReadAsync(endpoint);
}
void OnOpenReadCompleted(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)
{
MessageBox.Show(e.Error.ToString());
return;
}
if (e.Cancelled != true)
{
//获取下载的流数据(在此处是图片数据)并显示在图片控件中
//Stream stream = e.Result;
//BitmapImage bitmap = new BitmapImage();
//bitmap.SetSource(stream);
//imgDownLoad.Source = bitmap;
Stream clientStream = e.UserState as Stream;
Stream serverStream = (Stream)e.Result;
byte[] buffer = new byte[serverStream.Length];
serverStream.Read(buffer, 0, buffer.Length);
clientStream.Write(buffer, 0, buffer.Length);
clientStream.Close();
serverStream.Close();
}
}
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
this.tbMsgString.Text = string.Format("完成百分比：{0} 当前收到的字节数：{1} 资料大小：{2} ",
e.ProgressPercentage.ToString() + "%",
e.BytesReceived.ToString(),
e.TotalBytesToReceive.ToString());
}
#endregion
#region 上传图片
private void btnUpLoad_Click(object sender, RoutedEventArgs e)
{
/**/
/*
* OpenWriteCompleted - 在打开用于上传的流完成时（包括取消操作及有错误发生时）所触发的事件
* WriteStreamClosed - 在写入数据流的异步操作完成时（包括取消操作及有错误发生时）所触发的事件
* UploadProgressChanged - 上传数据过程中所触发的事件。如果调用 OpenWriteAsync() 则不会触发此事件
* Headers - 与请求相关的的标头的 key/value 对**
* 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
* Uri address - 接收上传数据的 URI
* string method - 所使用的 HTTP 方法（POST 或 GET）
* Object userToken - 需要上传的数据流
*/
OpenFileDialog openFileDialog = new OpenFileDialog()
{ //弹出打开文件对话框要求用户自己选择在本地端打开的图片文件
Filter = "Jpeg Files (*.jpg)|*.jpg|All Files(*.*)|*.*",
Multiselect = false //不允许多选
};
if (openFileDialog.ShowDialog() == true)//.DialogResult.OK)
{
//fileinfo = openFileDialog.Files; //取得所选择的文件，其中Name为文件名字段，作为绑定字段显示在前端
fileinfo = openFileDialog.File;
if (fileinfo != null)
{
WebClient webclient = new WebClient();
string uploadFileName = fileinfo.Name.ToString(); //获取所选文件的名字
#region 把图片上传到服务器上
Uri upTargetUri = new Uri(String.Format("http://localhost:4528/WebClientUpLoadStreamHandler.ashx?fileName={0}", uploadFileName), UriKind.Absolute); //指定上传地址
webclient.OpenWriteCompleted += new OpenWriteCompletedEventHandler(webclient_OpenWriteCompleted);
webclient.Headers["Content-Type"] = "multipart/form-data";
webclient.OpenWriteAsync(upTargetUri, "POST", fileinfo.OpenRead());
webclient.WriteStreamClosed += new WriteStreamClosedEventHandler(webclient_WriteStreamClosed);
#endregion
}
else
{
MessageBox.Show("请选取想要上载的图片!!!");
}
}
}
void webclient_OpenWriteCompleted(object sender, OpenWriteCompletedEventArgs e)
{
//将图片数据流发送到服务器上
// e.UserState - 需要上传的流（客户端流）
Stream clientStream = e.UserState as Stream;
// e.Result - 目标地址的流（服务端流）
Stream serverStream = e.Result;
byte[] buffer = new byte[4096];
int readcount = 0;
// clientStream.Read - 将需要上传的流读取到指定的字节数组中
while ((readcount = clientStream.Read(buffer, 0, buffer.Length)) > 0)
{
// serverStream.Write - 将指定的字节数组写入到目标地址的流
serverStream.Write(buffer, 0, readcount);
}
serverStream.Close();
clientStream.Close();
}
void webclient_WriteStreamClosed(object sender, WriteStreamClosedEventArgs e)
{
//判断写入是否有异常
if (e.Error != null)
{
System.Windows.Browser.H