1.上传
1 private void Button_Click_1(object sender, RoutedEventArgs e)
2 {
3 OpenFileDialog openFileDialog = new OpenFileDialog()
4 { //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
5 Filter = "Jpeg Files (*.jpg)|*.jpg|All Files(*.*)|*.*",
6 Multiselect = false //不允许多选
7 };
8
9 if (openFileDialog.ShowDialog() == true)//.DialogResult.OK)
10 {
11 //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
12 FileInfo fileinfo = openFileDialog.File;
13
14 if (fileinfo != null)
15 {
16 WebClient webclient = new WebClient();
17
18 string uploadFileName = fileinfo.Name.ToString(); //获取所选文件的名字
19
20 #region 把文件上传到服务器上
21
22 Uri upTargetUri = new Uri(String.Format("http://localhost:" + HtmlPage.Document.DocumentUri.Port + "/WebClientUpLoadStreamHandler.ashx?fileName={0}", uploadFileName), UriKind.Absolute); //指定上传处理程序
23
24 webclient.OpenWriteCompleted += new OpenWriteCompletedEventHandler(webclient_OpenWriteCompleted);
25 webclient.Headers["Content-Type"] = "multipart/form-data";//"application/x-www-form-urlencoded";//
26
27 webclient.OpenWriteAsync(upTargetUri, "POST", fileinfo.OpenRead());
28 webclient.WriteStreamClosed += new WriteStreamClosedEventHandler(webclient_WriteStreamClosed);
29
30 #endregion
31
32 }
33 else
34 {
35 MessageBox.Show("请选取想要上载的图片!!!");
36 }
37 }
38
39 }
40 void webclient_OpenWriteCompleted(object sender, OpenWriteCompletedEventArgs e)
41 {
42
43 //将图片数据流发送到服务器上
44
45 // e.UserState - 需要上传的流（客户端流）
46 Stream clientStream = e.UserState as Stream;
47 // e.Result - 目标地址的流（服务端流）
48 Stream serverStream = e.Result;
49 byte[] buffer = new byte[clientStream.Length];
50 int readcount = 0;
51 // clientStream.Read - 将需要上传的流读取到指定的字节数组中
52 while ((readcount = clientStream.Read(buffer, 0, buffer.Length)) > 0)
53 {
54 // serverStream.Write - 将指定的字节数组写入到目标地址的流
55 serverStream.Write(buffer, 0, readcount);
56 }
57 serverStream.Close();
58 clientStream.Close();
59 }
60 void webclient_WriteStreamClosed(object sender, WriteStreamClosedEventArgs e)
61 {
62 //判断写入是否有异常
63 if (e.Error != null)
64 {
65 System.Windows.Browser.HtmlPage.Window.Alert(e.Error.Message.ToString());
66 }
67 else
68 {
69 System.Windows.Browser.HtmlPage.Window.Alert("文件上传成功!!!");
70 }
71 }
1 using System;
2 using System.Collections.Generic;
3 using System.IO;
4 using System.Linq;
5 using System.Web;
6
7 namespace SilverlightApplication9.Web
8 {
9 /// <summary>
10 /// WebClientUpLoadStreamHandler 的摘要说明
11 /// </summary>
12 public class WebClientUpLoadStreamHandler : IHttpHandler
13 {
14
15 public void ProcessRequest(HttpContext context)
16 {
17 //获取上传的数据流
18 string fileNameStr = context.Request.QueryString["fileName"];
19
20 Stream sr = context.Request.InputStream;
21 try
22 {
23 string filename = "";
24
25 filename = fileNameStr;
26
27 byte[] buffer = new byte[4096];
28 int bytesRead = 0;
29 //将当前数据流写入服务器端文件夹ClientBin下
30 string targetPath = context.Server.MapPath("Pics/" + filename);
31
32 using (FileStream fs = File.Create(targetPath, 4096))
33 {
34 while ((bytesRead = sr.Read(buffer, 0, buffer.Length)) > 0)
35 {
36 //向文件中写信息
37 fs.Write(buffer, 0, bytesRead);
38 }
39 }
40
41 context.Response.ContentType = "text/plain";
42 context.Response.Write("上传成功");
43 }
44 catch (Exception e)
45 {
46 context.Response.ContentType = "text/plain";
47 context.Response.Write("上传失败, 错误信息:" + e.Message);
48 }
49 finally
50 { sr.Dispose(); }
51
52 }
53
54 public bool IsReusable
55 {
56 get
57 {
58 return false;
59 }
60 }
61 }
62 }
2.下载
2.1下载方法1
1 #region 下载图片
2 SaveFileDialog sfd = null;
3 private void btnDownload_Click(object sender, RoutedEventArgs e)
4 {
5 //向指定的Url发送下载流数据请求
6 string imgUrl = "http://localhost:51896/Pics/Wildlife.wmv";
7 Uri endpoint = new Uri(imgUrl);
8 sfd = new SaveFileDialog()
9 {
10 DefaultExt = "jpeg",
11 Filter = "Text files (*.jpeg)|*.jpeg|All files (*.*)|*.*",
12 FilterIndex = 2
13 };
14
15 if (sfd.ShowDialog() == true)
16 {
17
18 Uri end1point = new Uri(imgUrl);
19 WebClient client = new WebClient();
20 client.OpenReadCompleted += (ss, ee) =>
21 {
22 Stream pngStream = ee.Result;
23 byte[] binaryData = new Byte[pngStream.Length];
24 pngStream.Read(binaryData, 0, (int)pngStream.Length);
25 Stream stream = sfd.OpenFile();
26 stream.Write(binaryData, 0, binaryData.Length);
27 stream.Close();
28
29 };
30 client.DownloadProgressChanged += new DownloadProgressChangedEventHandler(clientDownloadStream_DownloadProgressChanged);
31 client.OpenReadAsync(endpoint);
32 }
33
34 }
35
36 void clientDownloadStream_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)
37 {
38 //DownloadProgressChangedEventArgs.ProgressPercentage - 下载完成的百分比
39 //DownloadProgressChangedEventArgs.BytesReceived - 当前收到的字节数
40 //DownloadProgressChangedEventArgs.TotalBytesToReceive - 总共需要下载的字节数
41 //DownloadProgressChangedEventArgs.UserState - 用户标识
42
43 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} ",
44 e.ProgressPercentage.ToString() + "%",
45 e.BytesReceived.ToString(),
46 e.TotalBytesToReceive.ToString());
47
48 }
49
50 #endregion
2.2下载方法2
1 private void btnDownload_Click(object sender, RoutedEventArgs e)
2 {
3 System.Windows.Browser.HtmlPage.Window.Eval("window.location.href=‘http://localhost:51896/download.ashx?filename=IMG_20140329_093302.jpg‘;");
4 }
1 using System;
2 using System.Collections.Generic;
3 using System.Linq;
4 using System.Web;
5
6 namespace SilverlightApplication9.Web
7 {
8 /// <summary>
9 /// download 的摘要说明
10 /// </summary>
11 public class download : IHttpHandler
12 {
13 private long ChunkSize = 102400;//100K 每次读取文件，只读取100Ｋ，这样可以缓解服务器的压力
14 public void ProcessRequest(HttpContext context)
15 {
16 //string fileName = "123.jpg";//客户端保存的文件名
17 String fileName = context.Request.QueryString["filename"];
18 string filePath = context.Server.MapPath(@"Pics/IMG_20140329_093302.jpg");
19 System.IO.FileInfo fileInfo = new System.IO.FileInfo(filePath);
20
21 if (fileInfo.Exists == true)
22 {
23 byte[] buffer = new byte[ChunkSize];
24 context.Response.Clear();
25 System.IO.FileStream iStream = System.IO.File.OpenRead(filePath);
26 long dataLengthToRead = iStream.Length;//获得下载文件的总大小
27 context.Response.ContentType = "application/octet-stream";
28 //通知浏览器下载文件而不是打开
29 context.Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));
30 while (dataLengthToRead > 0 && context.Response.IsClientConnected)
31 {
32 int lengthRead = iStream.Read(buffer, 0, Convert.ToInt32(ChunkSize));//读取的大小
33 context.Response.OutputStream.Write(buffer, 0, lengthRead);
34 context.Response.Flush();
35 dataLengthToRead = dataLengthToRead - lengthRead;
36 }
37 context.Response.Close();
38 context.Response.End();
39 }
40 //context.Response.ContentType = "text/plain";
41 //context.Response.Write("Hello World");
42 }
43
44 public bool IsReusable
45 {
46 get
47 {
48 return false;
49 }
50 }
51 }
52 }
3.删除
1 private void WebClientCommand(string isDeleteParam, int sort)
2 {
3 string uploadFileName = null;
4 WebClient webclient = new WebClient();
5 Uri upTargetUri = new Uri(String.Format("http://localhost:" + HtmlPage.Document.DocumentUri.Port + "/WebClientUpLoadStreamHandler.ashx?fileName={0}&result={1}", uploadFileName, isDeleteParam), UriKind.Absolute);
6 webclient.UploadStringCompleted += webclient_UploadStringCompleted;
7 webclient.UploadStringAsync(upTargetUri,"");
8
9
10
11 }
View
Code
1 void webclient_UploadStringCompleted(object sender, UploadStringCompletedEventArgs e)
2 {
3 if (e.Error == null)
4 {
5 EasySL.Controls.Window.Alert("删除成功", this.floatePanel);
6 }
7 }
1 using Huitu.Bjsq.Service;
2 using System;
3 using System.Collections.Generic;
4 using System.IO;
5 using System.Linq;
6 using System.Web;
7
8 namespace EasySL.Web
9 {
10 /// <summary>
11 /// WebClientUpLoadStreamHandler 的摘要说明
12 /// </summary>
13 public class WebClientUpLoadStreamHandler : IHttpHandler
14 {
15 public void ProcessRequest(HttpContext context)
16 {
17 //获取上传的数据流
18 string fileNameStr = context.Request.QueryString["fileName"];
19 string paramResult = context.Request.QueryString["result"];
20 Stream sr = context.Request.InputStream;
21 try
22 {
23 string filename = "";
24 filename = fileNameStr;
25 byte[] buffer = new byte[4096];
26 int bytesRead = 0;
27 if (!string.IsNullOrEmpty(paramResult))
28 {
29 foreach (string item in paramResult.Split(‘|‘))
30 {
31 string paramDel = context.Server.MapPath("FileLoad/" + item);
32 if (File.Exists(paramDel))
33 {
34 File.Delete(paramDel);
35 context.Response.ContentType = "text/plain";
36 context.Response.Write("删除成功");
37 }
38 }
39 }
40 else
41 {
42 //将当前数据流写入服务器端文件夹ClientBin下
43 string targetPath = context.Server.MapPath("FileLoad/" + filename);
44 using (FileStream fs = File.Create(targetPath, 4096))
45 {
46 while ((bytesRead = sr.Read(buffer, 0, buffer.Length)) > 0)
47 {
48 //向文件中写信息
49 fs.Write(buffer, 0, bytesRead);
50 }
51 }
52 context.Response.ContentType = "text/plain";
53 context.Response.Write("上传成功");
54 }
55 }
56
57 catch (Exception e)
58 {
59 context.Response.ContentType = "text/plain";
60 context.Response.Write("上传失败, 错误信息:" + e.Message);
61 }
62 finally
63 { sr.Dispose(); }
64 }
65
66 public bool IsReusable
67 {
68 get
69 {
70 return false;
71 }
72 }
73 }
74 }
4.对于处理上传大文件的处理
1 <configuration>
2 <system.web>
3 <compilation debug="true" targetFramework="4.5" />
4 <httpRuntime targetFramework="4.5" maxRequestLength="21048576" executionTimeout="7200" />
5 </system.web>
6 </configuration>
5.将程序发布在iis上注意的问题（代码是VS服务器运行正常，但是发布到IIS后上传文件总是失败。后来发现，我发布到IIS的虚拟目录，所以路径变了。）
Uri uri = new Uri(string.Format("/DataHandler.ashx?filename={0}",
fileName), UriKind.Relative);
// Uri uri = new
Uri("http://localhost/SEManage/UploadImg.ashx",
UriKind.Absolute);
WebClient client = new WebClient();
将Uri中的绝对路径，修改为相对路径
silverlight webclient实现上传、下载、删除操作
时间： 2024-10-12 13:12:58