Silverlight 2 (beta1)数据操作(2)——使用ASP.NET Web Service进行数据CRUD操作(下)

前台界面

后台代码

//按钮事件
void saveButton_Click(object sender, RoutedEventArgs e)
{
if (userName.Text.Trim() == string.Empty)
{
errMessage.Foreground = new SolidColorBrush(Colors.Red);
errMessage.Text = "请输入用户名称！";
errMessage.Visibility = Visibility.Visible;
return;
}
//调用WebService
WebServiceProxy.UserManageSoapClient userMgrSoapClient =
new YJingLee.WebSrv.WebServiceProxy.UserManageSoapClient();
//创建用户操作
userMgrSoapClient.CreateUserAsync(userName.Text);
userMgrSoapClient.CreateUserCompleted +=
new EventHandler<YJingLee.WebSrv.WebServiceProxy.
CreateUserCompletedEventArgs>
(userMgrSoapClient_CreateUserCompleted);
}
void userMgrSoapClient_CreateUserCompleted(object sender,
YJingLee.WebSrv.WebServiceProxy.CreateUserCompletedEventArgs e)
{
if (e.Error == null)
{
errMessage.Text = "创建用户成功！";
errMessage.Foreground = new SolidColorBrush(Colors.Blue);
errMessage.Visibility = Visibility.Visible;
}
else
{
errMessage.Foreground = new SolidColorBrush(Colors.Red);
errMessage.Text = e.Error.ToString();
errMessage.Visibility = Visibility.Visible;
}
}

查询数据部分

前台界面

我们使用Silverlight 2自带的DataGrid控件绑定数据。前台非常简单，只是一个DataGrid控件，但是前段时间有的同学问DataGrid控件不知怎么弄进来。这里详细说明一下。

第一步：在Silverlight工程中添加引用





第二步：查找System.Windows.Controls.Data程序集，添加进来





第三步：在UserControl中添加这个引用，有智能感知。我将其命名为Data。





在前台编写代码如下

<Button x:Name="reButton" Content="刷新"
Width="50" Height="30" Grid.Row="0"></Button>
<Data:DataGrid x:Name="userDataGrid" Height="200"
Width="700" Margin="0,5,0,10"
AutoGenerateColumns="True"
VerticalAlignment="Top" Grid.Row="1">
</Data:DataGrid>

后台代码

//显示数据
void ListingControlDisplay(object sender, RoutedEventArgs e)
{
WebServiceProxy.UserManageSoapClient userMgrSoapClient =
new YJingLee.WebSrv.WebServiceProxy.UserManageSoapClient();
userMgrSoapClient.RetrieveUsersAsync();
userMgrSoapClient.RetrieveUsersCompleted +=
new EventHandler<YJingLee.WebSrv.WebServiceProxy.
RetrieveUsersCompletedEventArgs>
(userMgrSoapClient_RetrieveUsersCompleted);
}
void userMgrSoapClient_RetrieveUsersCompleted(object sender,
YJingLee.WebSrv.WebServiceProxy.RetrieveUsersCompletedEventArgs e)
{
if (e.Error == null)
displayData(e.Result);
}
private void displayData(string xmlContent)
{
try
{
if (xmlContent != string.Empty)
{
XDocument xmlUsers = XDocument.Parse(xmlContent);
var users = from user in xmlUsers.Descendants("User")
select new
{
UserID = Convert.ToInt32
(user.Element("UserID").Value),
UserName = (string)
user.Element("UserName").Value
};
List<User> usersList = new List<User>();
foreach (var u in users)
{
User use = new User
{ UserID = u.UserID, UserName = u.UserName };
usersList.Add(use);
}
userDataGrid.ItemsSource = usersList;
}
else
{
userDataGrid.ItemsSource = null;
}
}
catch (Exception ex)
{

Console.Write(ex.Message);
}
}
public class User
{
public int UserID { get; set; }
public string UserName { get; set; }
}

修改数据部分

前台界面

后台代码

void updateButton_Click(object sender, RoutedEventArgs e)
{
if (userID.Text.Trim() == string.Empty)
{
errMessage.Foreground = new SolidColorBrush(Colors.Red);
errMessage.Text = "请输入用户ID！";
errMessage.Visibility = Visibility.Visible;
return;
}
if (userName.Text.Trim() == string.Empty)
{
errMessage.Foreground = new SolidColorBrush(Colors.Red);
errMessage.Text = "请输入用户名称！";
errMessage.Visibility = Visibility.Visible;
return;
}
WebServiceProxy.UserManageSoapClient userMgrSoapClient =
new YJingLee.WebSrv.WebServiceProxy.UserManageSoapClient();
//调用更新用户方法
userMgrSoapClient.UpdateUserAsync
(Int16.Parse(userID.Text.Trim()), userName.Text.Trim());
userMgrSoapClient.UpdateUserCompleted +=
new EventHandler<YJingLee.WebSrv.WebServiceProxy.
UpdateUserCompletedEventArgs>
(userMgrSoapClient_UpdateUserCompleted);
}
void userMgrSoapClient_UpdateUserCompleted(object sender,
YJingLee.WebSrv.WebServiceProxy.UpdateUserCompletedEventArgs e)
{
if (e.Error == null)
{
errMessage.Text = "修改用户成功！";
errMessage.Foreground = new SolidColorBrush(Colors.Blue);
errMessage.Visibility = Visibility.Visible;
}
else
{
errMessage.Foreground = new SolidColorBrush(Colors.Red);
errMessage.Text = e.Error.ToString();
errMessage.Visibility = Visibility.Visible;
}
}

删除数据部分

前台界面

后台代码

void deleteButton_Click(object sender, RoutedEventArgs e)
{
if (userID.Text.Trim() == string.Empty)
{
errMessage.Foreground = new SolidColorBrush(Colors.Red);
errMessage.Text = "请输入用户ID！";
errMessage.Visibility = Visibility.Visible;
return;
}
WebServiceProxy.UserManageSoapClient userMgrSoapClient =
new YJingLee.WebSrv.WebServiceProxy.UserManageSoapClient();
//调用删除方法
userMgrSoapClient.DeleteUserAsync
(Int16.Parse(userID.Text.Trim()));
userMgrSoapClient.DeleteUserCompleted+=
new EventHandler<YJingLee.WebSrv.WebServiceProxy.
DeleteUserCompletedEventArgs>
(userMgrSoapClient_DeleteUserCompleted);
}

void userMgrSoapClient_DeleteUserCompleted(object sender,
YJingLee.WebSrv.WebServiceProxy.DeleteUserCompletedEventArgs e)
{
if (e.Error == null)
{
errMessage.Text = "删除用户成功！";
errMessage.Foreground = new SolidColorBrush(Colors.Blue);
errMessage.Visibility = Visibility.Visible;
}
else
{
errMessage.Foreground = new SolidColorBrush(Colors.Red);
errMessage.Text = e.Error.ToString();
errMessage.Visibility = Visibility.Visible;
}
}

整合程序

在Page.xaml页面中布局，并引入用户控件，添加4个HyperlinkButton ，单击事件用户控件在中间区域显示。例如下面一个按钮事件：

deleteCtl.Visibility = Visibility.Visible;
entryCtl.Visibility = Visibility.Collapsed;
listingCtl.Visibility = Visibility.Collapsed;
editCtl.Visibility = Visibility.Collapsed;

最终效果图如下所示：

结语

利用这个实例我们学习了在Silverlight 2中使用ASP.NET Web Service进行数据CRUD操作，这里有一些细节没有完善，比如输入框的验证问题等。下一篇我们利用ADO.NET Data Service来操作数据。