Sliverlight 使用wcf上传文件

在很多时候，上传文件是经常要用到的，一般我两个方法，一种是通过ashx扩展，另一种说是通过wcf了，本篇只讲述使用后者的实现方法。

现实功能：文件上传，简单上传进度显示。

1.在asp.net工程里新建项：Silverlight-enabled WCF Service

添加一个DoUpload方法:

 1:  [ServiceContract(Namespace = "")]

 2:  [AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]

 3:  public class Service1

 4:  {

 5:      [OperationContract]

 6:      public void DoUpload(string fileName, byte[] context, bool append)

 7:      {

 8:          //上传目录

 9:          string folder = System.Web.Hosting.HostingEnvironment.MapPath("~/upload");

10:          if (!System.IO.Directory.Exists(folder))

11:          {

12:              //如果上传目录不存在则新建一个

13:              System.IO.Directory.CreateDirectory(folder);

14:          }

15:          //文件读写模式

16:          FileMode m = FileMode.Create;

17:          if (append)

18:          {

19:              //如果参数为true则表示续传，以追加模式操作文件

20:              m = FileMode.Append;

21:          }

22:  

23:          //写文件操作

24:          using (FileStream fs = new FileStream(folder + @"\" + fileName, m, FileAccess.Write))

25:          {

26:              fs.Write(context, 0, context.Length);

27:          }

28:          return;

29:      }

30:  }

2.引用我们的上述完成的wcf服务,silverlight工程右键->添加服务引用

上图中点击右边的Discover按扭.

上图中点击OK按扭.注意：如出现错误，请先按F5键运行整个工程。

3.引用成功后就到sl里的实现代码了，为了简单起见我只使用了一个button控件:

MainPage.xaml

1:  <UserControl x:Class="uploadFile.MainPage"

2:      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 

3:      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

4:      xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 

5:      mc:Ignorable="d" d:DesignWidth="640" d:DesignHeight="480">

6:      <Grid x:Name="LayoutRoot">

7:          <Button x:Name="bt" Content="UpLoad" Height="100" Width="200" />

8:      </Grid>

9:  </UserControl>

4.MainPage.xaml.cs，客户端所有操作

  1:  public partial class MainPage : UserControl

  2:  {

  3:      public MainPage()

  4:      {

  5:          InitializeComponent();

  6:      }

  7:  

  8:      public MainPage()

  9:      {

 10:          InitializeComponent();

 11:          //注册button的点击事件

 12:          bt.Click += new RoutedEventHandler(bt_Click);

 13:      }

 14:  

 15:      //点击事件

 16:      void bt_Click(object sender, RoutedEventArgs e)

 17:      {

 18:          //选择本地文件对话框

 19:          OpenFileDialog d = new OpenFileDialog();

 20:          //文件过滤

 21:          d.Filter = "(*.*)|*.*";

 22:          //只能选单个文件

 23:          d.Multiselect = false;

 24:          //选择完成

 25:          if (d.ShowDialog() == true)

 26:          {

 27:              //文件信消

 28:              FileInfo f = d.File;

 29:              //新实例化一个文件从uploadfile类

 30:              uploadfile file = new uploadfile();

 31:              //文件名

 32:              file.name = f.Name;

 33:              //文件流内容

 34:              Stream s = f.OpenRead();

 35:              //文件大小(/1000是为了方便查看，成为k为单位)

 36:              file.size = s.Length / 1000;

 37:              //实例file的内容

 38:              file.context = new List<byte[]>();

 39:  

 40:              //这里读取指定大小的文件流内容到file.context准备上传

 41:              int b;

 42:              while (s.Position > -1 && s.Position < s.Length)

 43:              {

 44:                  if (s.Length - s.Position >= 300)

 45:                  {

 46:                      b = 3000;

 47:                  }

 48:                  else

 49:                  {

 50:                      b = (int)(s.Length - s.Position);

 51:                  }

 52:  

 53:                  byte[] filebyte = new byte[b];

 54:                  s.Read(filebyte, 0, b);

 55:                  file.context.Add(filebyte);

 56:              }

 57:              s.Close();

 58:  

 59:              //实例化wcf客户端

 60:              ServiceReference1.uploadServiceClient uploader = new uploadFile.ServiceReference1.uploadServiceClient();

 61:              //注册DoUpload完成事件

 62:              uploader.DoUploadCompleted += new EventHandler<System.ComponentModel.AsyncCompletedEventArgs>(uploader_DoUploadCompleted);

 63:              //开始第一个包的上传

 64:              uploader.DoUploadAsync(file.name, file.context[0], false, file);

 65:          }

 66:      }

 67:  

 68:      void uploader_DoUploadCompleted(object sender, System.ComponentModel.AsyncCompletedEventArgs e)

 69:      {

 70:          if (e.Error == null)

 71:          {

 72:              //上一个包上传成功

 73:              uploadfile file = e.UserState as uploadfile;

 74:              //修改已上传大小(显示作用)

 75:              file.sent += file.context[0].Length / 1000;

 76:              //删除已上传内容

 77:              file.context.RemoveAt(0);

 78:              //如果上传内容是空,完成操作

 79:              if (file.context.Count == 0)

 80:              {

 81:                  bt.Content = "upload";

 82:                  MessageBox.Show("upload OK");

 83:              }

 84:              else

 85:              {

 86:                  //如果上传内容不是空，则继续剩余下一段内容上传

 87:                  (sender as ServiceReference1.uploadServiceClient).DoUploadAsync(file.name, file.context[0], true, file);

 88:                  //显示进度

 89:                  bt.Content = file.sent.ToString() + "/" + file.size.ToString();

 90:              }

 91:          }

 92:      }

 93:  }

 94:  

 95:  public class uploadfile

 96:  {

 97:      //文件名

 98:      public string name { get; set; }

 99:      //文件大小 

100:      public double size { get; set; }

101:      //已上传

102:      public double sent { get; set; }

103:      //上传内容

104:      public List<byte[]> context { get; set; }

105:  }