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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。

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

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原文地址：http://blog.csdn.net/u013948187/article/details/47292227