数据网格wpf中的数据绑定组合框 [英] databinding combobox in datagrid wpf

查看：51 发布时间：2019/6/17 0:38:19 wpf

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问题描述

亲爱的朋友

我已阅读一个非常好的样本（https://social.technet.microsoft.com/wiki/contents/articles/26347.wpf-combobox-binding-in-datagrid.aspx）来自

最好的问候，

Cherry

Dear Friends

I have read a very good sample about this in (https://social.technet.microsoft.com/wiki/contents/articles/26347.wpf-combobox-binding-in-datagrid.aspx) from Andy ONeill (very genius) but I cant make it work

I want when user changes the name of the doctor in another combobox family change accordingly

it would be very appreciated if you can help me with

here is my copy from andy's sample

code behind

namespace WpfApp25
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
///
public class NameandFamily : ObservableCollection<DocInfo>
{

}
public class DocInfo
{
public string familyDoc { get; set; }
public string nameDoc { get; set; }
public int id { get; set; }

}
public partial class MainWindow : Window
{

public MainWindow()
{
InitializeComponent();
this.DataContext = new MainVModel();

}

public class MainVModel : NotifyUIBase
{

public ObservableCollection<DocInfo> docnames { get; set; }

public MainVModel()
{
docnames = new ObservableCollection<DocInfo>();
docnames.Add(new DocInfo { nameDoc = "ahmad", familyDoc = "ahmadi" , id=1 });
docnames.Add(new DocInfo { nameDoc = "javad", familyDoc = "javadi" , id=2});

NameandFamily cc = Application.Current.Resources["ColourSource"] as NameandFamily;
cc.Add(new DocInfo { nameDoc = "ahmad", familyDoc="ahmadi", id=1});
cc.Add(new DocInfo { nameDoc = "ali", familyDoc = "johari" , id=2});
Application.Current.Resources["ColourSource"] = cc;

RaisePropertyChanged("nameDoc");
RaisePropertyChanged("familyDoc");
RaisePropertyChanged("id");
}

}

public class NotifyUIBase : INotifyPropertyChanged
{
// Very minimal implementation of INotifyPropertyChanged matching msdn
// Note that this is dependent on .net 4.5+ because of CallerMemberName
public event PropertyChangedEventHandler PropertyChanged;
public void RaisePropertyChanged([CallerMemberName] String propertyName = "")
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
}
}
}

Xaml

defined resource

<Application.Resources>
<local:NameandFamily x:Key="ColourSource">

</local:NameandFamily>

</Application.Resources>

bindings

解决方案

Hi 3ib,

I do one sample about populating combobox based on another combobox using xaml, please take a look:

xaml:

 <StackPanel>

        <ComboBox
            Width="300"
            Margin="0,20,0,20"
            DisplayMemberPath="Id"
            ItemsSource="{Binding parents}"
            SelectedItem="{Binding selectedparent}" />
        <ComboBox
            Width="100"
            DisplayMemberPath="name"
            ItemsSource="{Binding childs}"
            SelectedItem="{Binding selectedchild}" />

    </StackPanel>

xaml.cs:

 /// </summary>
    public partial class Window2 : Window
    {

        public Window2()
        {
            InitializeComponent();
            this.DataContext = new viewmodel();

        }
    }
    public class viewmodel:ViewModelBase
    {
        private ObservableCollection<parent> _parents;
        public ObservableCollection<parent> parents
        {
            get { return _parents; }
            set
            {
                _parents = value;
                RaisePropertyChanged("parents");
            }
        }
        private ObservableCollection<child> _childs;
        public ObservableCollection<child> childs
        {
            get { return _childs; }
            set
            {
                _childs = value;
                RaisePropertyChanged("childs");
            }
        }
        private parent _selectedparent;
        public parent selectedparent
        {
            get { return _selectedparent; }
            set
            {
                _selectedparent = value;
                RaisePropertyChanged("selectedparent");
                childs = _selectedparent.childs;
                RaisePropertyChanged("childs");
            }
        }
        private child _selectedchild;
        public child selectedchild
        {
            get { return _selectedchild; }
            set
            {
                _selectedchild = value;
                RaisePropertyChanged("selectedchild");
              
            }
        }

        public viewmodel()
        {
            parents = new ObservableCollection<parent>()
            {
                new parent(){Id=1,FirstChar="a", childs=new ObservableCollection<child>()
                {
                    new child(){Id=1,name="a1"},
                    new child(){Id=2,name="a2"},
                    new child(){Id=3,name="a3"},
                    new child(){Id=4,name="a4"},

                }
                },
                  new parent(){Id=2,FirstChar="b", childs=new ObservableCollection<child>()
                {
                    new child(){Id=1,name="b1"},
                    new child(){Id=2,name="b2"},
                    new child(){Id=3,name="b3"},
                    new child(){Id=4,name="b4"},

                }
                  },
                    new parent(){Id=3,FirstChar="c", childs=new ObservableCollection<child>()
                {
                    new child(){Id=1,name="c1"},
                    new child(){Id=2,name="c2"},
                    new child(){Id=3,name="c3"},
                    new child(){Id=4,name="c4"},

                }
                  }

        };
            selectedparent = parents[0];

        }
    }
    public class parent
    {
        public Int32 Id { get; set; }
        public string FirstChar { get; set; }
        public ObservableCollection<child> childs { get; set; }
    }
    public class child
    {
        public Int32 Id { get; set; }
        public string name { get; set; }
    }

Here is also a sample, you can take a look:

https://social.technet.microsoft.com/wiki/contents/articles/17946.cascading-comboboxes-in-wpf-using-mvvm.aspx

Best Regards,

Cherry

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