[C#.NET][WPF] 控制項的資料繫結(五) - ObjectDataProvider(續) | 余小章 @ 大內殿堂 - 點部落

2011-10-20

[C#.NET][WPF] 控制項的資料繫結(五) - ObjectDataProvider(續)

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WPF Binding
2020-03-24

[C#.NET][WPF] 控制項的資料繫結(五)–ObjectDataProvider(續)

上篇提到ObjectDataProvider在XAML裡的用法，但仍不夠詳細，本篇期待將它補完，XAML可以將.NET的類別加入參考，然後初始化、呼叫方法傳遞、參數

先定義MemberList類別


public class MemberList : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;
    protected void OnPropertyChanged(string name)
    {
        PropertyChangedEventHandler handler = PropertyChanged;
        if (handler != null)
        {
            handler(this, new PropertyChangedEventArgs(name));
        }
    }
    public MemberList()
    {
    }
    public string Name { get; set; }
    public MemberList(string Name)
    {
        this.Name = Name;
    }

    public string GetName()
    {
        return this.Name;
    }
    public string GetName(string Name)
    {
        return this.Name + Name;
    }
    private ObservableCollection<Member> _members = new ObservableCollection<Member>
    {
        new Member { ID =  1 , Name = "余小章" , Age = 18,Phone="0806449"},
        new Member { ID =  2 , Name = "gy" , Age = 65,Phone="2" },
        new Member { ID = 3, Name = "Raymond", Age = 13, Phone = "3" },
        new Member { ID = 4, Name = "Kobe", Age = 32, Phone = "43" },
    };

    public List<Member> GetGroup()
    {
        if (this._members == null)
            return null;
        return this._members.Where(o => o.ID >= 1).ToList();
    }

    private BindingList<Member> _Group = null;
    public BindingList<Member> Group
    {
        get
        {
            if (this._Group == null)
            {
                this._Group = new BindingList<Member>();
                this._Group.Add(new Member { ID = 1, Name = "余小章", Age = 12, Phone = "0806449" });
                this._Group.Add(new Member { ID = 2, Name = "gy", Age = 15, Phone = "2" });
                this._Group.Add(new Member { ID = 3, Name = "Raymond", Age = 13, Phone = "3" });
                this._Group.Add(new Member { ID = 4, Name = "Kobe", Age = 32, Phone = "43" });
            }
            return _Group;
        }
        set
        {
            _Group = value;
            OnPropertyChanged("Group");
        }
    }
}

匯入專案裡的命名空間，local是縮寫定義
xmlns:local="clr-namespace:Demo01"

匯入.NET的命名空間，System、System.IO是縮寫定義
xmlns:System.IO="clr-namespace:System.IO;assembly=mscorlib"
xmlns:System="clr-namespace:System;assembly=mscorlib"

用法一：初始化類別，呼叫不帶參數的建構函數，請參考上篇

<Window.DataContext>
<ObjectDataProvider x:Name="dataSource" ObjectType="{x:Type local:MemberList}"/>
</Window.DataContext>

用法二：初始化類別，呼叫帶參數的建構函數，這裡定義了ObjectDataProvider.ConstructorParameters區段

<Window.DataContext>
    <ObjectDataProvider x:Name="dataSource" d:IsDataSource="True" ObjectType="{x:Type local:MemberList}">
        <ObjectDataProvider.ConstructorParameters>
            <System:String>余小章</System:String>
        </ObjectDataProvider.ConstructorParameters>
    </ObjectDataProvider>
</Window.DataContext>

用法三：綁定方法，不帶參數，定義MethodName區段，表示由XAML呼叫方法

<Window.DataContext>
    <ObjectDataProvider x:Name="dataSource" d:IsDataSource="True" ObjectType="{x:Type local:MemberList}" MethodName="GetName" >
        <ObjectDataProvider.ConstructorParameters>
            <System:String>余小章</System:String>
        </ObjectDataProvider.ConstructorParameters>
    </ObjectDataProvider>
</Window.DataContext>

用法四：綁定方法，帶參數

<Window.Resources>
    <ObjectDataProvider x:Key="dataSource" ObjectType="{x:Type local:MemberList}" MethodName="GetName" >
        <ObjectDataProvider.ConstructorParameters>
            <System:String>霹靂無敵</System:String>
        </ObjectDataProvider.ConstructorParameters>
        <ObjectDataProvider.MethodParameters>
            <System:String>余小章</System:String>
        </ObjectDataProvider.MethodParameters>
    </ObjectDataProvider>
</Window.Resources>

當我設定繫結時，TextBox馬上就會出現結果，如沒有馬上出現結果表示你的元件可能還沒有經過編譯

接下來，我要用綁定類別方法的方式，呼叫 .NET Directory類別裡的GetDirectories方法

<Window.DataContext>
    <ObjectDataProvider x:Name="dataSource" ObjectType="{x:Type System.IO:Directory}" MethodName="GetDirectories" >
        <ObjectDataProvider.MethodParameters>
            <System:String>D:\</System:String>
        </ObjectDataProvider.MethodParameters>
    </ObjectDataProvider>
</Window.DataContext>