WPF DataGrid ListView等控件Binding LINQ数据源

Binding及与之配套的数据转换和校验是WPF的核心。一些详细的只是介绍，园子里到处都是，这里DebugLZQ不再赘述。

首先回顾下WPF常用的Binding数据源

1.控件属性---控件的属性与属性Binding           

经典的例子如下：

<TextBox Height="23" HorizontalAlignment="Left" Margin="28,42,0,0" Name="textBox1" VerticalAlignment="Top" Width="120" Text="{Binding Path=Value,ElementName=slider1,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"/>

        <Slider Height="23" HorizontalAlignment="Left" Margin="28,94,0,0" Name="slider1" VerticalAlignment="Top" Width="225" />

重点是这里：

Text="{Binding Path=Value,ElementName=slider1,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"

2.Object数据源       

控件的属性与一个内存Object绑定，该对象所在类实现IPropertyChanged接口

using System.ComponentModel;//



namespace Binding

{

    class Machine:INotifyPropertyChanged

    {

        #region INotifyPropertyChanged 成员



        public event PropertyChangedEventHandler PropertyChanged;



        #endregion



        private int temperature;

        public int Temperature

        {

            get { return temperature; }

            set 

            {

                temperature = value;

                //引发事件

                if (PropertyChanged != null)

                {

                    PropertyChanged.Invoke(this, new PropertyChangedEventArgs("temperature"));

                }

            }

        }

    }

}

页面布局如下：

using System.Windows;

using System.Windows.Controls;

using System.Windows.Data;



namespace Binding

{

    /// <summary>

    /// Window2.xaml 的交互逻辑

    /// </summary>

    public partial class Window2 : Window

    {

        Machine machine;

        public Window2()

        {

            InitializeComponent();



            //数据源

            machine = new Machine();

            //Binding

            System.Windows.Data.Binding binding = new System.Windows.Data.Binding();

            binding.Source = machine;

            binding.Path = new PropertyPath("Temperature");

            //

            BindingOperations.SetBinding(textBox1, TextBox.TextProperty, binding);



        }



        private void button1_Click(object sender, RoutedEventArgs e)

        {

            System.Timers.Timer timer = new System.Timers.Timer();

            timer.Interval = 500;

            timer.Enabled = true;

            timer.Elapsed += new System.Timers.ElapsedEventHandler(timer_Elapsed);

        }



        void timer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)

        {

            machine.Temperature++;

        }

    }

}

3.XML数据源     

不去多说，前面的博文中有类似的

4.ADO.NET中的DataTable  

即从数据库获得一个DataTable对象， Binding到DataGrid或ListView。

自定义数据库表定义如下：

//----------直接DataTable数据源-------------------------------------

DataTable dataTable = SQLHelper.GetDataTable();

dataGrid1.ItemsSource = dataTable.DefaultView;

SQLHelper类如下，该静态类之定义了一个方法用来获得一个DataTable，下面的LINQ数据源使用相同的SQLHelper.GetDataTable()方法。

using System.Data.SqlClient;

using System.Data;



namespace Binding

{

    class SQLHelper

    {

        public static string connstring = @"Data Source=.\SQLEXPRESS;AttachDbFilename=E:\VS2010Pros\Binding\Binding\Database1.mdf;Integrated Security=True;User Instance=True";

            

        public static DataTable GetDataTable()

        {

            using (SqlConnection conn = new SqlConnection(connstring))

            {

                string sql = @"select Id,Name,Age from tb_Student";

                SqlDataAdapter sda = new SqlDataAdapter(sql, conn);



                DataTable dt = new DataTable();                

                sda.Fill(dt);



                return dt;

            }



            

        }

    }

}

在xaml中加入Binding，DataGrid控件定义如下：

<DataGrid AutoGenerateColumns="False" Height="130" HorizontalAlignment="Left" Margin="24,16,0,0" Name="dataGrid1" VerticalAlignment="Top" Width="230" >

            <DataGrid.Columns>

                <DataGridTextColumn Header="Id" Width="60" Binding="{Binding Id}"/>

                <DataGridTextColumn Header="Name" Width="100" Binding="{Binding Name}"/>

                <DataGridTextColumn Header="Age" Width="60" Binding="{Binding Age}"/>

            </DataGrid.Columns>

        </DataGrid>

结果如下(因为DebugLZQ现在开启的是XP系统，所以界面有点丑)：

5.LINQ 数据源  DataGrid ListView等控件Binding LINQ数据源                

主要是LINQ to DataSet 和LINQ to SQL。

首先是LINQ to DataSet Binding到ListView。其中的dataTable获取方法和上面的一样。

            //----------Linq to DataSet数据源----------------------------------------

            var query = from row in dataTable.Rows.Cast<DataRow>()

                        where Convert.ToString(row["Name"]).StartsWith("D")

                        select new

                        {

                            Id=int.Parse(row["Id"].ToString()),

                            Name=row["Name"].ToString(),

                            Age = int.Parse(row["Age"].ToString())

                        };

            

            listView1.ItemsSource = query;

ListView 定义及Binding如下：

        <ListView Height="100" HorizontalAlignment="Left" Margin="24,173,0,0" Name="listView1" VerticalAlignment="Top" Width="224" >

            <ListView.View>

                <GridView>

                    <GridViewColumn Header="Id" Width="60" DisplayMemberBinding="{Binding Id}"/>

                    <GridViewColumn Header="Name" Width="100" DisplayMemberBinding="{Binding Name}"/>

                    <GridViewColumn Header="Age" Width="60" DisplayMemberBinding="{Binding Age}"/>

                </GridView>

            </ListView.View>

        </ListView>

结果如下：

下面给是LINQ to SQL 数据源Binding到DataGrid控件。

 用来映射tb_Student表的Student类定义如下：

using System.Data.Linq.Mapping;



namespace Binding

{

    [Table(Name="tb_Student")]

    class Student

    {

        [Column(IsPrimaryKey = true, DbType = "Int NOT NULL IDENTITY", IsDbGenerated = true, Name = "Id")]

        public int Id { get; set; }



        [Column(DbType = "nvarchar(20)", Name = "Name")]

        public string Name { get; set; }



        [Column(DbType = "int", Name = "Age")]

        public int Age { get; set; }



    }

}

对数据源的LINQ操作如下,随便写了一个:

//---------Linq to SQL 数据源------------------------------------

System.Data.Linq.DataContext dc = new System.Data.Linq.DataContext(SQLHelper.connstring );



var students= dc.GetTable<Student>();



var query_2 = from s in students

        where s.Name.Contains("D")

        select s;



dataGrid2.ItemsSource = query_2;

DataGrid 定义及Binding如下：

<DataGrid AlternatingRowBackground="#FFAACC0B" AutoGenerateColumns="False" Height="130" HorizontalAlignment="Left" Margin="267,74,0,0" Name="dataGrid2" VerticalAlignment="Top" Width="230">

            <DataGrid.Columns>

                <DataGridTextColumn Binding="{Binding Id}" Header="Id" Width="60"   />

                <DataGridTextColumn Binding="{Binding Name}" Header="Name" Width="100" />

                <DataGridTextColumn Binding="{Binding Age}" Header="Age" Width="60"  />

            </DataGrid.Columns>

        </DataGrid>

程序运行结果如下：