[Silverlight]利用WebClient的UploadStringAsync或OpenWriteAsync來上傳檔案

2008-12-07

25851
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Silverlight

今天到網路上找了一些WebClient的資源
整理了WebClient的UploadStringAsync與OpenWriteAsync
如何利用這兩個東西來上傳檔案.

今天到網路上找了一些WebClient的資源

整理了WebClient的UploadStringAsync與OpenWriteAsync

如何利用這兩個東西來上傳檔案.

WebClientFileUpload.xaml

WebClientFileUpload.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.IO; namespace SilverlightApplication1 { public partial class WebClientFileUpload : UserControl { public WebClientFileUpload() { InitializeComponent(); } private void btnUpload_Click(object sender, RoutedEventArgs e) { OpenFileDialog dialog = new OpenFileDialog(); //只允許上傳一個檔案 dialog.Multiselect = false; //第1個Filter(只限圖檔),第2個Filter(所有檔案) dialog.Filter = "Image Files(*.BMP;*.JPG;*.GIF)|*.BMP;*.JPG;*.GIF|All files (*.*)|*.*"; //使用第1個Filter dialog.FilterIndex = 1; //方法1-Start string data = string.Empty; if (dialog.ShowDialog() == true) { using (System.IO.Stream fileStream = dialog.File.OpenRead()) { byte[] array = new byte[fileStream.Length]; fileStream.Read(array, 0, array.Length); data = Convert.ToBase64String(array); UploadData(dialog.File.Name, data); } } //方法1-End //方法2-Start //if (dialog.ShowDialog() == true) //{ // UploadFile(dialog.File.Name, dialog.File.OpenRead()); //} //方法2-End } //方法1 private void UploadData(string fileName, string data) { UriBuilder ub = new UriBuilder("http://localhost:9161/fileupload.aspx"); ub.Query = string.Format("fileName={0}", fileName); WebClient wc = new WebClient(); wc.UploadStringAsync(ub.Uri, data); } //方法2 private void UploadFile(string fileName, FileStream data) { UriBuilder ub = new UriBuilder("http://localhost:9161/fileupload.aspx"); ub.Query = string.Format("fileName={0}", fileName); WebClient c = new WebClient(); c.OpenWriteCompleted += (sender, e) => { PushData(data, e.Result); e.Result.Close(); data.Close(); }; c.OpenWriteAsync(ub.Uri, "POST"); } //方法2 private void PushData(FileStream input, Stream output) { byte[] buffer = new byte[4096]; int bytesRead; while ((bytesRead = input.Read(buffer, 0, buffer.Length)) != 0) { output.Write(buffer, 0, bytesRead); } } } }

fileupload.aspx.cs

using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using System.IO; namespace SilverlightApplication1.Web { public partial class fileupload : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { //方法1 string data; using (StreamReader sr = new StreamReader(Request.InputStream)) { data = sr.ReadToEnd(); byte[] array = Convert.FromBase64String(data); string fileName = Request.QueryString["fileName"].ToString(); using (FileStream fs = new FileStream("C://" + fileName, FileMode.Create)) { fs.Write(array, 0, array.Length); } } //方法2 //using (StreamReader sr = new StreamReader(Request.InputStream)) //{ // int streamLength = (int)sr.BaseStream.Length; // byte[] byteArray = new byte[streamLength]; // sr.BaseStream.Read(byteArray, 0, streamLength); // string fileName = Request.QueryString["fileName"].ToString(); // using (FileStream fs = new FileStream("C://" + fileName, FileMode.Create)) // { // fs.Write(byteArray, 0, byteArray.Length); // } //} } } }

如果上傳超過4MB,記得在Web.config加上↓

如果不能上傳試試加上crossdomain.xml↓

<?xml version="1.0"?> <!DOCTYPE cross-domain-policy SYSTEM "http://www.macromedia.com/xml/dtds/cross-domain-policy.dtd"> <cross-domain-policy> <allow-http-request-headers-from domain="*" headers="*"/> </cross-domain-policy>

執行結果：

參考網址：
http://silverlight.net/forums/p/49139/130032.aspx
http://silverlight.net/forums/t/17545.aspx

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