silverlight中 设置 头像（添加图片）

参考文章: http://www.cnblogs.com/wsdj-ITtech/archive/2009/08/26/1554056.html

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1. ChainManager.xaml 前台

<Grid Grid.Row="0" Grid.Column="3" Grid.RowSpan="3" Margin="0,0,0,0" HorizontalAlignment="Left">
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="*"/>
                                <ColumnDefinition Width="50"/>
                            </Grid.ColumnDefinitions>

<Border BorderThickness="1" Width="110" Height="110" Margin="5" BorderBrush="#404040">
                                <Image x:Name="imgHead" Margin="5" Stretch="Fill"/>
                            </Border>
                            <telerik:RadButton Name="btnPhoto" Grid.Column="1" Content="选择" Width="40" Height="25" Click="btnPhoto_Click"  TabIndex="3"/>
                        </Grid>

2. XAMLChainManager.cs 后台

设定全局变量
        System.IO.FileInfo fileinfo = null;     //获取选定图片信息

---

/// <summary>
        /// 获取图片文件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnPhoto_Click(object sender, RoutedEventArgs e)
        {
            try
            {

　　　　　　/*
             　　*　　 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
             　　*/

　　           // 获取图片文件
                OpenFileDialog openFileDialog = new OpenFileDialog()
                {
                    Filter = "JPEG Images (*.jpg,*.jpeg)|*.jpg;*.jpeg|PNG Images (*.png)|*.png|All images|*.png;*.jpg;*.jpeg",
                    Multiselect = false
                };

if (openFileDialog.ShowDialog() == true)//.DialogResult.OK)
                {
                    fileinfo = openFileDialog.File;

if (fileinfo != null)
                    {

　　　　　　　　 // 图片显示在页面空间里
                        RadBitmap vwatermarkBitmap = new RadBitmap(fileinfo.OpenRead());
                        this.imgHead.Source = vwatermarkBitmap.Bitmap;
                    }
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

/// <summary>
        /// 图片上传到服务器上
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnSave_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                   if (fileinfo != null)
                    {
                        #region 把图片上传到服务器上

WebClient webclient = new WebClient();

　　　　　　　　  Uri WebUri = new Uri(Application.Current.Host.Source, "../");  //获取网站根目录
                         Uri upTargetUri = new Uri(String.Format(WebUri + "WebClientUpLoadStreamHandler.ashx?fileName={0}", fileinfo.Name.ToString()), 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 += delegate(object sender1, WriteStreamClosedEventArgs f)
                        {
                            if (f.Error != null)
                            {
                                System.Windows.Browser.HtmlPage.Window.Alert(f.Error.Message.ToString());
                            }
                        };

#endregion
                    }
            }
            catch (Exception)
            {
                RadWindow.Alert("保存失败，请稍后重试！");
            }
        }

/// <summary>
        /// 将图片数据流发送到服务器上
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>

void Webclient_OpenWriteCompleted(object sender, OpenWriteCompletedEventArgs e)
        {
            Stream clientStream = e.UserState as Stream;  // 需要上传的流（客户端流）
            Stream serverStream = e.Result;  // 目标地址的流（服务端流）
            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();
        }

---

在数据存的是文件名称 （代码这里省略）：

　　chain.ImgName = fileinfo == null ? "" : fileinfo.Name.ToString(); //获取所选文件的名字;

从数据库中读到文件名称后，显示在页面上：

　　 imgHead.Source = new BitmapImage(new Uri("/Pics/" + chain.ImgName, UriKind.Relative));

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3. 在服务端添加文件（WebClientUpLoadStreamHandler.ashx），如图

代码实现如下：

/// <summary>
    /// WebClientUpLoadStreamHandler 的摘要说明
    /// </summary>
    public class WebClientUpLoadStreamHandler : IHttpHandler
    {
        public bool IsReusable
        {
            get
            {
                return false;
            }
        }

public void ProcessRequest(HttpContext context)
        {
            //获取上传的数据流
            string fileNameStr = context.Request.QueryString["fileName"];

Stream sr = context.Request.InputStream;

try
            {
                string filename = "";
                filename = fileNameStr;

byte[] buffer = new byte[4096];

int bytesRead = 0;

//将当前数据流写入服务器端文件夹ClientBin下
                string targetPath = context.Server.MapPath("/ClientBin/Pics/" + filename);

using (FileStream fs = File.Create(targetPath, 4096))
                {
                    while ((bytesRead = sr.Read(buffer, 0, buffer.Length)) > 0)
                    {
                        //向文件中写信息
                        fs.Write(buffer, 0, bytesRead);
                    }
                }

context.Response.ContentType = "text/plain";
                context.Response.Write("上传成功");
            }

catch (Exception e)
            {
                context.Response.ContentType = "text/plain";
                context.Response.Write("上传失败, 错误信息:" + e.Message);
            }

finally
            {
                sr.Dispose();
            }
        }
    }

4.并且在服务端建立文件夹 Pics，储存上传到服务器的图片，如图：