using System.Collections.Generic;
using System.Net;
using System.IO;
using System.Text;
using System.Diagnostics;
using Windows.Foundation;
using System.Windows.Media.Imaging;
using System.Threading.Tasks;
namespace XXXX.ViewModels.HttpClient
{
/// <summary>
/// Provides common methods for sending data to and
/// receiving data from an HTTP POST web request.
/// 發送post請求封裝類
/// </summary>
public class PostClient
{
#region Members
/// <summary>
/// Post data query string.
/// </summary>
StringBuilder _postData = new StringBuilder();
byte[] bytes;
#endregion
#region Events
/// <summary>
/// Event handler for DownloadStringCompleted event.
/// </summary>
/// <param name="sender">Object firing the event.</param>
/// <param name="e">Argument holding the data downloaded.</param>
public delegate void DownloadStringCompletedHandler(object sender, DownloadStringCompletedEventArgs e);
/// <summary>
/// Occurs when an asynchronous resource-download operation is completed.
/// </summary>
public event DownloadStringCompletedHandler DownloadStringCompleted;
#endregion
#region Constructors
/// <summary>
/// Creates a new instance of PostClient with the specified parameters.
/// </summary>
/// <param name="data">POST parameters in string format. Valid string format is something like "id=120&name=John".</param>
public PostClient(string parameters)
{
_postData.Append(parameters);
}
/// <summary>
/// Creates a new instance of PostClient with the specified parameters.
/// </summary>
/// <param name="data">POST parameters in Stream format.</param>
public PostClient(Byte[] parameters)
{
bytes = parameters;
}
public Byte[] Bytes
{
get
{
return bytes;
}
}
/// <summary>
/// Creates a new instance of PostClient with the specified parameters.
/// </summary>
/// <param name="parameters">POST parameters as a list of string. Valid list elements are "id=120" and "name=John".</param>
public PostClient(IList<string> parameters)
{
foreach (var element in parameters)
{
_postData.Append(string.Format("{0}&", element));
}
}
/// <summary>
/// Creates a new instance of PostClient with the specified parameters.
/// </summary>
/// <param name="parameters">POST parameters as a dictionary with string keys and values. Valid elements could have keys "id" and "name" with values "120" and "John" respectively.</param>
public PostClient(IDictionary<string, string> parameters)
{
foreach (var pair in parameters)
{
_postData.Append(string.Format("{0}={1}&", pair.Key, pair.Value));
}
}
#endregion
#region Public methods
/// <summary>
/// Downloads the resource at the specified Uri as a string.
/// </summary>
/// <param name="address">The location of the resource to be downloaded.</param>
public void DownloadStringAsync(Uri address)
{
HttpWebRequest request;
try
{
request = (HttpWebRequest)WebRequest.Create(address);
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
request.BeginGetRequestStream(new AsyncCallback(RequestReady), request);
}
catch
{
if (DownloadStringCompleted != null)
{
System.Windows.Deployment.Current.Dispatcher.BeginInvoke(delegate()
{
DownloadStringCompleted(this, new DownloadStringCompletedEventArgs(new Exception("Error creating HTTP web request.")));
});
}
}
}
#endregion
#region Protected methods
protected void RequestReady(IAsyncResult asyncResult)
{
HttpWebRequest request = asyncResult.AsyncState as HttpWebRequest;
using (Stream stream = request.EndGetRequestStream(asyncResult))
{
stream.Position = 0;
stream.Write(bytes, 0, bytes.Length);
stream.Close();
//註釋using (StreamWriter writer = new StreamWriter(stream))
//{
// string _post = _postData.ToString();
// _post = _post.Substring(0, _post.Length - 1);
// writer.Write(_post.ToString());
// Debug.WriteLine(_post);
// writer.Flush();
//}
}
request.BeginGetResponse(new AsyncCallback(ResponseReady), request);
}
protected void ResponseReady(IAsyncResult asyncResult)
{
HttpWebRequest request = asyncResult.AsyncState as HttpWebRequest;
HttpWebResponse response = null;
try
{
response = (HttpWebResponse)request.EndGetResponse(asyncResult);
Byte[] buffer = new Byte[bytes.Length];
using (Stream responseStream = response.GetResponseStream())
{
responseStream.Position = 0;
responseStream.Read(buffer, 0, buffer.Length);
//responseStream.Read(bytes, 0, bytes.Length);
responseStream.Close();
//註釋 using (StreamReader reader = new StreamReader(responseStream))
// {
// result = reader.ReadToEnd();
// }
}
if (DownloadStringCompleted != null)
{
System.Windows.Deployment.Current.Dispatcher.BeginInvoke(delegate()
{
DownloadStringCompleted(this, new DownloadStringCompletedEventArgs(buffer));
});
}
}
catch
{
if (DownloadStringCompleted != null)
{
System.Windows.Deployment.Current.Dispatcher.BeginInvoke(delegate()
{
DownloadStringCompleted(this, new DownloadStringCompletedEventArgs(new Exception("Error getting HTTP web response.")));
});
}
}
}
#endregion
}
public class DownloadStringCompletedEventArgs : EventArgs
{
#region Properties
/// <summary>
/// Gets the data that is downloaded by a DownloadStringAsync method.
/// </summary>
public string stringResult { get; private set; }
public Byte[] bytesResult { get; private set; }
/// <summary>
/// Gets a value that indicates which error occurred during an asynchronous operation.
/// </summary>
public Exception Error { get; private set; }
#endregion
#region Constructors
/// <summary>
/// Creates a new instance of DownloadStringCompletedEventArgs with the specified result data.
/// </summary>
/// <param name="result">The data that is downloaded by a DownloadStringAsync method.</param>
public DownloadStringCompletedEventArgs(string result)
{
stringResult = result;
}
/// <summary>
/// Creates a new instance of DownloadStringCompletedEventArgs with the specified result data.
/// </summary>
/// <param name="result">The data that is downloaded by a DownloadStringAsync method.</param>
public DownloadStringCompletedEventArgs(Byte[] Buffer)
{
bytesResult = Buffer;
}
/// <summary>
/// Creates a new instance of DownloadStringCompletedEventArgs with the specified exception.
/// </summary>
/// <param name="ex">The exception generated by the asynchronous operation.</param>
public DownloadStringCompletedEventArgs(Exception ex)
{
Error = ex;
}
#endregion
}
}
//調用方法
PostClient postClient = new PostClient(bytes);
postClient.DownloadStringAsync(new Uri(strUrl));
postClient.DownloadStringCompleted += new PostClient.DownloadStringCompletedHandler(postClient_DownloadStringCompleted);
//改方法爲回調方法 ，當數據請求完成後，會觸發該方法
void postClient_DownloadStringCompleted(object sender, Perfect365.ViewModels.HttpClient.DownloadStringCompletedEventArgs e)
{
bytesKey = e.bytesResult;
}