silverlight上传的一些总结

概述最近在学silverlight，在做上传图片时做了一些总结。 首相先创建一个silverlight项目，命名为OpenFileSample， Mainpage前台：  <UserControl x:Class="OpenFileSample.MainPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation

最近在学silverlight，在做上传图片时做了一些总结。

首相先创建一个silverlight项目，命名为OpenfileSample，

Mainpage前台：

 <UserControl x:Class="OpenfileSample.MainPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/Expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" d:DesignWIDth="640" d:DesignHeight="480"> <GrID x:name="LayoutRoot" Background="White"> <GrID.RowDeFinitions> <RowDeFinition Height="280"/> <RowDeFinition Height="*"/> </GrID.RowDeFinitions> <!--图片预览区域--> <border GrID.Row="0" GrID.Column="0" WIDth="320" Height="240" borderBrush="Black" borderThickness="2"> <Image x:name="image" Stretch="Fill"/> </border> <!--功能区域--> <StackPanel OrIEntation="Horizontal" WIDth="320" GrID.Row="1" GrID.Column="1"> <button x:name="btnPrevIEw" FontSize="23" Click="btnPrevIEw_Click" Content="PrevIEw" WIDth="150" Height="50"/> <button x:name="btnUpload" FontSize="23" Click="btnUpload_Click" Content="Upload" WIDth="150" Height="50"/> </StackPanel> </GrID></UserControl>

Mainpage后台：

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;using System.IO;namespace OpenfileSample{ public partial class MainPage : UserControl { private string ext = string.Empty; //创建文件对话框 private OpenfileDialog openfile = new OpenfileDialog() { Filter = "Jpeg files (*.jpg)|*.jpg|All files(*.*)|*.*",Multiselect = true }; public MainPage() { InitializeComponent(); } voID webclIEnt_OpenWriteCompleted(object sender,OpenWriteCompletedEventArgs e) { //将图片数据流发送到服务器上 Stream inputStream = e.UserState as Stream; Stream outputStream = e.Result; //缓冲区 byte[] buffer = new byte[4096]; int bytesRead = 0; while ((bytesRead = inputStream.Read(buffer,buffer.Length)) > 0) { outputStream.Write(buffer,bytesRead); } //关闭流 outputStream.Close(); inputStream.Close(); MessageBox.Show("上传完成！"); } private voID btnUpload_Click(object sender,RoutedEventArgs e) { //判断用户是否已选择了图片 if (openfile.file != null) { //图片文件名 ext = openfile.file.Extension; WebClIEnt webclIEnt = new WebClIEnt(); //指定上传处理的服务地址 Uri uri = new Uri("http://localhost:2923/Uploadfile.ashx?ext=" + ext,UriKind.absolute); webclIEnt.OpenWriteCompleted += new OpenWriteCompletedEventHandler (webclIEnt_OpenWriteCompleted); //POST图片文件到服务器Uploadfile.ashx webclIEnt.OpenWriteAsync(uri,"POST",openfile.file.OpenRead()); } else { MessageBox.Show("请先选取图片！"); } } private voID btnPrevIEw_Click(object sender,RoutedEventArgs e) { //d出文件对象框 if (openfile.ShowDialog() == true) { BitmAPImage bmp = new BitmAPImage(); //设置图源为用户选择的图片 bmp.SetSource(openfile.file.OpenRead()); image.source = bmp; } } }}

然后再服务端创建一个Uploadfile.ashx处理文件

代码如下：

 <%@ WebHandler Language="C#" Class="Uploadfile" %>using System;using System.Collections;using System.Data;using System.linq;using System.Web;using System.Web.Services;using System.Web.Services.Protocols;using System.Xml.linq;using System.IO;public class Uploadfile : IhttpHandler { public voID ProcessRequest (httpContext context) { //获取上传的数据流 string filename = ""; string ext = context.Request["ext"]; filename = DateTime.Now.ToShortDateString() + ext; Stream sr = context.Request.inputStream; int bytesRead = 0; byte[] buffer = new byte[4096]; //取得文件名 try { //上传服务器的Upload文件夹里 string path = context.Server.MapPath("Upload/"); //将数据流写入服务器端 using (fileStream fs = file.Create(path + filename,4096)) { while ((bytesRead = sr.Read(buffer,buffer.Length)) > 0) { fs.Write(buffer,bytesRead); } } } catch (Exception e) { //错误提示 context.Response.ContentType = "text/plain"; context.Response.Write ("上传失败,提示信息:" + e.Message); } finally { sr.dispose(); } } public bool IsReusable { get { return false; } }}

这样就完成了上传功能。

首先说明下里面的一些小细节，很多刚接触的人可能会遇到这些问题：

1、new Uri("http://localhost:2923/UploadFile.ashx?ext="这里的端口号要一致。

2、添加Asp.Web应用程序和Asp.Net网站的一般处理文件有些不同，一个有cs文件，一个没有，在上面代码要写在没有cs文件的Uploadfile上，对于这是什么原因我也不太清楚，我在调试中非得用那种形式才可以运行，所以要新建一个Asp.Net网站在里面写上面的代码，然后再把那文件拷贝过去才可以，如果有知道的朋友可以告诉我下，我也是刚接触silverlight。

总结

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