新浪微博客户端围脖七开发笔记（4） 实现SinaService接口
经过前面的准备，现在可以动手实现SinaService接口和界面布局啦！
SinaService的实现不难，用linq解析下xml就好了。AppKey，用户名，密码就要自己去申请啦。
代码
private
void
InitWebClient(
ref
WebClient wc)
{
wc
=
new
WebClient();
string
usernamePassword
=
Settings.Username
+
"
:
"
+
Settings.Password;
wc.Credentials
=
new
NetworkCredential(Settings.Username, Settings.Password);
wc.Headers[
"
Authorization
"
]
=
"
Basic
"
+
Convert.ToBase64String(System.Text.Encoding.UTF8.GetBytes(usernamePassword));
}
///
<summary>
///
Gets the statuses.
///
</summary>
///
<param name="onGetStatusesCompleted">
The on get Statuses completed.
</param>
///
<param name="onError">
The on error.
</param>
public
void
GetStatuses(Int64 sinceId, Int64 maxId,
Action
<
List
<
Status
>>
onGetStatusesCompleted
=
null
, Action
<
Exception
>
onError
=
null
, Action onFinally
=
null
)
{
WebClient wcRefreshHome
=
null
;
InitWebClient(
ref
wcRefreshHome);
//
if (wcRefreshHome.IsBusy) wcRefreshHome.CancelAsync();
//
register on download complete event
wcRefreshHome.DownloadStringCompleted
+=
delegate
(
object
sender, DownloadStringCompletedEventArgs e)
{
try
{
//
report error
if
(e.Error
!=
null
)
{
if
(onError
!=
null
)
{
onError(e.Error);
}
return
;
}
XElement xmlResult
=
XElement.Parse(e.Result);
List
<
Status
>
list
=
new
List
<
Status
>
();
ParseService.ParseTimeLine(xmlResult,
ref
list);
//
notify completed callback
if
(onGetStatusesCompleted
!=
null
)
{
onGetStatusesCompleted(list);
}
}
catch
(Exception ex)
{
Trace.DetailMsg(ex.Message);
if
(onError
!=
null
)
{
onError(ex);
}
return
;
}
finally
{
//
notify finally callback
if
(onFinally
!=
null
)
{
onFinally();
}
}
};
string
requestUrl
=
Settings.RefreshHomeURL
+
"
?source=
"
+
Settings.AppKey;
//
The list is empty, just get some status
if
(sinceId
==
0
&&
maxId
==
0
)
{
requestUrl
=
requestUrl
+
"
&count=
"
+
Settings.NumberPerRequest;
}
//
Get status later than sinceId
if
(sinceId
!=
0
&&
maxId
==
0
)
{
requestUrl
=
requestUrl
+
"
&since_id=
"
+
(sinceId
+
1
)
+
"
&count=
"
+
Settings.NumberPerRequest;
}
//
Get status early than maxId
if
(sinceId
==
0
&&
maxId
!=
0
)
{
requestUrl
=
requestUrl
+
"
&max_id=
"
+
(maxId
-
1
)
+
"
&count=
"
+
Settings.NumberPerRequest;
}
wcRefreshHome.DownloadStringAsync(
new
Uri(requestUrl), Settings.RefreshHomeURL);
}
}
相应的ParseService如下：
代码
public
static
class
ParseService
{
public
static
void
ParseTimeLine(XElement xElement,
ref
List
<
Status
>
statusList)
{
try
{
foreach
(XElement status
in
xElement.Descendants(
"
status
"
))
{
statusList.Add(ParseStatus(status));
}
}
catch
(FormatException ex)
{
Deployment.Current.Dispatcher.BeginInvoke(()
=>
{
MessageBox.Show(ex.Message.ToString());
});
}
}
private
static
void
ParseUserList(XElement xElement,
ref
List
<
User
>
userList )
{
try
{
foreach
(XElement user
in
xElement.Descendants(
"
user
"
))
{
User friend
=
new
User();
userList.Add(ParseUser(user));
}
}
catch
(FormatException ex)
{
Deployment.Current.Dispatcher.BeginInvoke(()
=>
{
MessageBox.Show(ex.Message.ToString());
});
}
}
private
static
Status ParseStatus(XElement status)
{
Status newStatus
=
new
Status();
try
{
newStatus.Id
=
long
.Parse(status.Element(
"
id
"
).Value);
newStatus.Text
=
status.Element(
"
text
"
).Value;
Regex regex
=
new
Regex(
"
>.*<
"
);
newStatus.Source
=
status.Element(
"
source
"
).Value;
Match match
=
regex.Match(newStatus.Source);
if
(match.Success)
{
newStatus.Source
=
match.ToString().Replace(
"
<
"
,
string
.Empty).Replace(
"
>
"
,
string
.Empty);
}
newStatus.CreatedAt
=
DateTime.ParseExact(status.Element(
"
created_at
"
).Value,
"
ddd MMM dd HH:mm:ss zzzz yyyy
"
,
CultureInfo.CurrentCulture,
DateTimeStyles.AllowWhiteSpaces);
newStatus.Favorited
=
bool
.Parse(status.Element(
"
favorited
"
).Value);
//
newTweet.Retweeted = bool.Parse(status.Element("retweeted").Value);
//
newTweet.RetweetCount = int.Parse(status.Element("retweet_count").Value);
newStatus.User
=
ParseUser(status.Element(
"
user
"
));
//
if (!status.Element("thumbnail_pic").IsEmpty)
//
{
//
newStatus.ThumbnailPic = status.Element("thumbnail_pic").Value;
//
}
newStatus.ThumbnailPic
=
status.Element(
"
thumbnail_pic
"
).Value;
}
catch
(Exception ex)
{
Trace.DetailMsg(
"
ParseStatus Error:
"
+
ex.Message);
}
return
newStatus;
}
private
static
User ParseUser(XElement User)
{
User user
=
new
User();
try
{
user.Id
=
ulong
.Parse(User.Element(
"
id
"
).Value);
user.ScreenName
=
User.Element(
"
screen_name
"
).Value;
user.Name
=
User.Element(
"
name
"
).Value;
user.ImageUrl
=
User.Element(
"
profile_image_url
"
).Value;
user.Url
=
User.Element(
"
url
"
).Value;
user.Followers
=
int
.Parse(User.Element(
"
followers_count
"
).Value);
user.Friends
=
int
.Parse(User.Element(
"
friends_count
"
).Value);
user.Description
=
User.Element(
"
description
"
).Value;
user.Location
=
User.Element(
"
location
"
).Value;
user.CreatedAt
=
DateTime.ParseExact(User.Element(
"
created_at
"
).Value,
"
ddd MMM dd HH:mm:ss zzzz yyyy
"
,
CultureInfo.CurrentCulture,
DateTimeStyles.AllowWhiteSpaces);
}
catch
(Exception ex)
{
Trace.DetailMsg(
"
ParseUser Error:
"
+
ex.Message);
}
return
user;
}
}
主页面用到了Pivot Control
代码
<
Grid x:Name
=
"
LayoutRoot
"
Background
=
"
Transparent
"
>
<
ProgressBar IsIndeterminate
=
"
{Binding IsHomeRefreshing}
"
VerticalAlignment
=
"
Top
"
Visibility
=
"
{Binding IsHomeRefreshing, Converter={StaticResource VisibilityConverter}}
"
/>
<!--
Pivot Control
-->
<
controls:Pivot Title
=
"
围脖七
"
>
<!--
Pivot item one
-->
<
controls:PivotItem
>
<
controls:PivotItem.Header
>
<
ContentControl
>
<
StackPanel
>
<
TextBlock Text
=
"
主页
"
FontSize
=
"
54
"
/>
</
StackPanel
>
</
ContentControl
>
</
controls:PivotItem.Header
>
<
ListBox d:LayoutOverrides
=
"
Height
"
Grid.Row
=
"
1
"
d:IsHidden
=
"
True
"
ItemsSource
=
"
{Binding HomeList, Mode=OneWay}
"
ItemTemplate
=
"
{StaticResource TweetItemTemplate}
"
SelectionChanged
=
"
ListBox_SelectionChanged
"
/>
</
controls:PivotItem
>
<!--
Pivot item two
-->
<
controls:PivotItem
>
<
controls:PivotItem.Header
>
<
ContentControl
>
<
TextBlock Text
=
"
消息
"
FontSize
=
"
54
"
FontFamily
=
"
Segoe WP Light
"
/>
</
ContentControl
>
</
controls:PivotItem.Header
>
<
Grid VerticalAlignment
=
"
Top
"
>
<
ListBox x:Name
=
"
TopicList
"
ItemsSource
=
"
{Binding TopicList, Mode=OneWay}
"
/>
</
Grid
>
</
controls:PivotItem
>
</
controls:Pivot
>
</
Grid
>
每条微博的DataTemplate如下
代码
<
DataTemplate x:Name
=
"
TweetItemTemplate
"
>
<
Grid Margin
=
"
0,5
"
>
<
Grid.ColumnDefinitions
>
<
ColumnDefinition Width
=
"
Auto
"
/>
<
ColumnDefinition Width
=
"
*
"
/>
</
Grid.ColumnDefinitions
>
<
Image Grid.Column
=
"
0
"
Source
=
"
{Binding User.ImageUrl}
"
Height
=
"
73
"
Width
=
"
73
"
VerticalAlignment
=
"
Top
"
Margin
=
"
0,5,7,0
"
HorizontalAlignment
=
"
Left
"
/>
<
StackPanel Grid.Column
=
"
1
"
VerticalAlignment
=
"
Top
"
>
<
Grid Width
=
"
380
"
>
<
TextBlock Text
=
"
{Binding User.ScreenName}
"
VerticalAlignment
=
"
Center
"
Foreground
=
"
#FFC8AB14
"
FontSize
=
"
24
"
/>
<
StackPanel HorizontalAlignment
=
"
Right
"
Orientation
=
"
Horizontal
"
VerticalAlignment
=
"
Center
"
>
<
Image Source
=
"
/Images/Tulips.png
"
Visibility
=
"
{Binding ThumbnailPic, Converter={StaticResource VisibilityConverter}}
"
/>
<
TextBlock Text
=
"
{Binding CreatedAt, Converter={StaticResource TimeConverter}}
"
FontSize
=
"
20
"
Foreground
=
"
LightGray
"
Margin
=
"
5,0
"
/>
</
StackPanel
>
</
Grid
>
<!--
TextBlock Text
=
"
{Binding Text}
"
FontSize
=
"
22
"
TextWrapping
=
"
Wrap
"
/-->
<
TextBlock Text
=
"
{Binding Text}
"
TextWrapping
=
"
Wrap
"
FontFamily
=
"
Arial
"
/>
</
StackPanel
>
</
Grid
>
</
DataTemplate
>
记得在MainPageViewModel的构造函数中调用RefreshHomeList
代码
if
(
!
DesignerProperties.IsInDesignTool)
{
if
(HomeList.Count
==
0
)
{
RefreshHomeList(
0
,
0
);
}
}
最后把viewmodel和view联系起来，在App.xaml中声明
代码
xmlns:viewModels
=
"
clr-namespace:WeiBo7.ViewModels
"
<
Application.Resources
>
<
misc:VisibilityConverter x:Key
=
"
VisibilityConverter
"
/>
<
misc:TimeConverter x:Key
=
"
TimeConverter
"
/>
<
viewModels:MainPageViewModel x:Key
=
"
MainPageViewModel
"
/>
</
Application.Resources
>
在MainPage.xaml中声明就大功告成了!
DataContext
=
"
{StaticResource MainPageViewModel}
"
因为间隔时间比较长，上面只是提到了些关键实现，有些地方可能忘记了。如有问题请留言给我！