下面是一个DEMO，用于执行一个简单的查询雇员信息的 *** 作．运行结果如下图所示:
首先我们要新建一个Silverlight Application,名称为：SearchUserControl
在该项目中添加一个Silverlight User Control,名称为：EmployeeSearch
然后我们在该用户控件的CS代码中添加一个类用于描述雇员信息，如下：
public class EmployeeInfo
{
public string EmployeeNo { get ; set ; }
public string Employeename { get ; set ; }
}
另外还有一个EmployeenameEventArgs类，用于当点击查询时，将要查询的雇员姓名以事件
参数方式传递到Page页面中，如下：
public class EmployeenameEventArgs : EventArgs
{
public string Employeename { get ; set ; }
}
到这里准备工作就绪，下面是相应的控件xaml代码，请将其粘贴到EmployeeSearch.xaml中:
< GrID x:name ="LayoutRoot" Background ="White" >
< GrID.RowDeFinitions >
< RowDeFinition Height ="200" />
< RowDeFinition Height ="100" />
< RowDeFinition Height ="50" />
</ GrID.RowDeFinitions >
< ListBox margin ="10" x:name ="EmployeeList" />
< StackPanel GrID.Row ="1" margin ="12" >
< TextBlock > 输入要查询的名称： </ TextBlock >
< TextBox x:name ="Search" margin ="10" Text ="james" />
</ StackPanel >
< button margin ="10" Content ="获取Employee信息" GrID.Row ="2" Click ="OnGetEmployee"
WIDth ="120" />
</ GrID >
然后将下面的cs代码复制到EmployeeSearch.xaml.cs中，相关内容参见注释:
public partial class EmployeeSearch : System.windows.Controls.UserControl
{
#region 使用依赖属性从PAGE页面传参到当前用户控件,详情参见Page.xaml页面
public static DependencyProperty SearchEmployeenameProperty =
DependencyProperty.Register( " SearchEmployeename " , typeof ( string ),
typeof (EmployeeSearch), null );
public string SearchEmployeename
{
get
{
return (( string ) base .GetValue(SearchEmployeenameProperty));
}
set
{
base .SetValue(SearchEmployeenameProperty, value);
}
}
#endregion
/// <summary>
/// 声明查询单击事件
/// </summary>
public event EventHandler < EmployeenameEventArgs > SearchClick;
public EmployeeSearch()
{
InitializeComponent();
this .Loaded += OnLoaded;
}
voID OnLoaded( object sender, RoutedEventArgs e)
{
Search.Text = SearchEmployeename;
}
voID OnGetEmployee( object o, EventArgs e)
{
// 当有事件绑定时(参见page.xaml中的 SearchClick="OnSearch" 属性)
if (SearchClick != null )
{
SearchEmployeename = Search.Text;
// 运行绑定的单击事件代码
SearchClick( this , new EmployeenameEventArgs()
{
Employeename = Search.Text
});
}
}
// 将ListBox的ItemsSource属性开放给Page页面，以便进行数据绑定
public System.Collections.IEnumerable ItemsSource
{
get
{
return EmployeeList.ItemsSource;
}
set
{
EmployeeList.ItemsSource = value;
}
}
}
这样控件的开发就完成了，下面是在page.xaml中声明并设置这个控件相应属性的代码：
< UserControl x:Class ="SearchUserControl.Page"
xmlns ="http://schemas.microsoft.com/clIEnt/2007"
xmlns:x ="http://schemas.microsoft.com/winfx/2006/xaml"
WIDth ="400" Height ="400" xmlns:local ="clr-namespace:SearchUserControl" >
< UserControl.Resources >
< local:EmployeeInfo Employeename ="王五" x:Key ="myEmployee" />
</ UserControl.Resources >
< StackPanel x:name ="LayoutRoot" Background ="White" >
< local:EmployeeSearch x:name ="SearchControl" SearchClick ="OnSearch"
SearchEmployeename = "{Binding Employeename}"
DataContext = "{StaticResource myEmployee}" />
< TextBlock x:name ="txtEmployeename" Text ="暂无" FontSize ="16" margin ="10" TextAlignment ="Center" />
</ StackPanel >
</ UserControl >
其中的xmlns:local="clr-namespace:SearchUserControl"为控件的名空间的引用，类似于我们
以前写用户控件时的：
< %@ Register TagPrefix ="" namespace ="" Assembly ="" % >
而下面代码即是我们引用该控件并进行属性设置的声明：
< local:EmployeeSearch x:name ="SearchControl" SearchClick ="OnSearch"
SearchEmployeename = " {Binding Employeename} "
DataContext = " {StaticResource myEmployee} " />
StaticResource myEmployee会使用本地绑定的静态资源中所指向的数据，如下：
< UserControl.Resources >
< local:EmployeeInfo Employeename ="王五" x:Key ="myEmployee" />
</ UserControl.Resources >
这样就会将控件中的搜索框绑定到该初始值（资源）上．
而下面就是实际运行这个控件执行查询 *** 作时CS代码（page.xaml.cs）：
voID OnSearch( object sender, EmployeenameEventArgs e)
{
List < string > employeeList = new List < string > ();
foreach (EmployeeInfo en in GetData(e.Employeename))
{
employeeList.Add(en.EmployeeNo + " " + en.Employeename);
}
SearchControl.ItemsSource = employeeList;
txtEmployeename.Text = " 查询有关 """ + SearchControl.SearchEmployeename + """ Employee信息 " ;
}
private List < EmployeeInfo > GetData( string value)
{
Dictionary < string , string > employee = new Dictionary < string , string > (){ { " 10001 " , " 张三 " },
{ " 10002 " , " 李四 " },
{ " 10003 " , " 王五 " },
{ " 10004 " , " 马六 " },
{ " 10005 " , " 王大麻子 " },
{ " 10006 " , " 王宝强 " },
{ " 10007 " , " 王蛋蛋 " },
{ " 10008 " , " 王五强 " }
};
return (from e in employee
where e.Value.Contains(value.Trim())
select new EmployeeInfo
{
EmployeeNo = e.Key,
Employeename = e.Value
}).ToList();
}
因为代码比较简单，基本上就是一个linq to object查询，所以就不多做说明了．
好了，今天的内容就先到这里，有兴趣的朋友可以在回复中进行讨论．
源码下载地址，请点击这里:) 总结
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