【发布时间】：2012-06-13 15:17:07
【问题描述】：
我们正面临一个问题，DownloadStringCompleted 方法在 windows phone 7 中总是返回相同的结果？
首先通过服务绑定挂起的请求。显示列表框中的请求放置了两个按钮。当单击该调用接受服务时，该服务更新表。 再次调用显示先前结果的待处理请求服务。为什么请告诉我...
代码：
private void getpendingrequests()
{
WebClient wcgetfriends = new WebClient();
wcgetfriends.DownloadStringAsync(
new Uri("http://{ipaddress}/Network/Reccords/GetFriends?userid=" + userId));
wcgetfriends.DownloadStringCompleted +=
new DownloadStringCompletedEventHandler(
wcgetfriends_DownloadStringCompleted);
}
void wcgetfriends_DownloadStringCompleted(object sender,
DownloadStringCompletedEventArgs e)
{
String resultgetfriends = null, responseCode = null;
using (var reader = new StringReader(e.Result))
{
resultgetfriends = reader.ReadToEnd();
}
XmlReader xmlDoc = XmlReader.Create(new MemoryStream(System.Text.UTF8Encoding.UTF8.GetBytes(resultgetfriends)));
while (xmlDoc.Read())
{
if (xmlDoc.NodeType == XmlNodeType.Element)
{
if (xmlDoc.Name.Equals("ResponseCode"))
{
responseCode = xmlDoc.ReadInnerXml();
}
}
}
if (Convert.ToInt32(responseCode) == 200)
{
string result1 = e.Result.ToString();
XDocument xmlDocu = XDocument.Load(new MemoryStream(System.Text.UTF8Encoding.UTF8.GetBytes(result1)));
interestrates = (from rts in xmlDocu.Descendants("Friend")
select new SampleCheckedData
{
Id = (string)rts.Element("userid"),
Name = (string)rts.Element("name"),
Icon = (string)rts.Element("imageurl"),
}).ToObservableCollection<SampleCheckedData>();
this.lstFriendRequuest.ItemsSource = interestrates;
}
if (Convert.ToInt32(responseCode) == 201)
{
MessageBox.Show("UserId is not type of integer");
}
if (Convert.ToInt32(responseCode) == 202)
{
MessageBox.Show("User not exists");
}
if (Convert.ToInt32(responseCode) == 203)
{
MessageBox.Show("No Pending Requests");
}
}
private void requestaccept()
{
WebClient wcacceptrequest = new WebClient();
wcacceptrequest.DownloadStringAsync(
new Uri("http://{ipaddress}/Network/Reccords/FriendRequestAcceptance?userid=" + userId + "&frienduserid=" + _id + "&acceptid=" + 1));
wcacceptrequest.DownloadStringCompleted +=
new DownloadStringCompletedEventHandler(
wcacceptrequest_DownloadStringCompleted);
Image b = sender as Image;
var res = interestrates.Where(a => a.Id.Equals(((System.Windows.FrameworkElement)(e.OriginalSource)).Tag)).ToList();
if (res.Count == 1)
interestrates.Remove(res.First());
}
void wcacceptrequest_DownloadStringCompleted(object sender,
DownloadStringCompletedEventArgs e)
{
String resultaccept = null, responseCode = null;
using (var reader = new StringReader(e.Result))
{
resultaccept = reader.ReadToEnd();
}
XmlReader xmlDoc = XmlReader.Create(new MemoryStream(System.Text.UTF8Encoding.UTF8.GetBytes(resultaccept)));
while (xmlDoc.Read())
{
if (xmlDoc.NodeType == XmlNodeType.Element)
{
if (xmlDoc.Name.Equals("ResponseCode"))
{
responseCode = xmlDoc.ReadInnerXml();
}
}
}
if (Convert.ToInt32(responseCode) == 200)
{
lstFriendRequuest.ItemsSource = "";
interestrates = new ObservableCollection<SampleCheckedData>();
bindGetFriends();
}
if (Convert.ToInt32(responseCode) == 201)
{
MessageBox.Show("UserId is not type of integer");
}
if (Convert.ToInt32(responseCode) == 202)
{
MessageBox.Show("Friend Id not type of integer");
}
if (Convert.ToInt32(responseCode) == 203)
{
MessageBox.Show("Accept id not type of integer");
}
}
请告诉我为什么在 bindfriends 方法中得到以前的结果......
【问题讨论】：
-
当你已经拥有
e.Result中的字符串时，为什么还要创建StringReader来获取字符串？你为什么多次将响应代码转换为整数？为什么要以不同的方式两次解析 XML 文档？你为什么在字符串上调用ToString？您似乎正在竭尽全力使您的代码复杂...... -
我如你所说更改了我的代码，但总是得到 previuos 结果导致 downloadstringcomplete 方法。
-
请帮我尝试解决这个问题...
-
可能是因为您在
DownloadStringAsync语句之后添加了DownloadStringCompleted事件处理程序。尝试更改顺序。
标签： windows-phone-7