如何执行不同的选择时,多个组合框的绑定到一个共同的来源? [英] How to enforce distinct selections when multiple ComboBox's are bound to a common source?
问题描述
在我的WPF应用程序我有4个组合框。他们都被填充这种方式;
In my WPF app i have 4 comboboxes. They all are populated this way;
combobox1.ItemSource = dt.DefaultView;
combobox1.DisplayMemberpath = "Name";
combobox2.ItemSource = dt.DefaultView;
combobox2.DisplayMemberpath = "Name";
等了 combobox3
和 combobox4
。
这 DT
(数据表)已经包含了不同的名称因为我使用获取记录不同的名称
。现在我该怎么办,这样当从combobox1选择一个名称不应该是在其他3组合框列表中。
This dt
(DataTable) already contains distinct Names as I am fetching records using distinct Name
. Now what should I do so that when a Name is selected from combobox1 it should not be available in other 3 comboboxes list.
我看了一个问题(的WPF多重组合框的束缚,以一个共同的来源,实施不同的选择),但无法找到一个方法来做到这一点。
I read a question(WPF Multiple ComboBox's bound to a common source, enforcing distinct selections) but couldn't find a way to do it.
推荐答案
有关使用一个RowFilter什么?这门课程,如果你使用一个新的数据视图,而不是默认视图只是工作。你可以创建4数据视图,设置的RowFilter当过一个的SelectedItem改变。
what about using a RowFilter? this of course just work if you use a new DataView instead of the DefaultView. you could create 4 DataView and set the RowFilter when ever a SelectedItem changed.
看我在的这个线程。样品是列表视图,但是你可以很容易实现与组合框相同
look at my answer in this thread. the sample is for listview, but you can easy achieve the same with combobox
编辑:快速和肮脏的例子:)
quick and dirty example :)
数据
public class MyTest
{
private DataTable dt;
public BindingListCollectionView View1 { get; set; }
public BindingListCollectionView View2 { get; set; }
public BindingListCollectionView View3 { get; set; }
public BindingListCollectionView View4 { get; set; }
private string _selected1;
public string Selected1
{
get { return _selected1; }
set { _selected1 = value;
this.UpdateFilter();
}
}
private void UpdateFilter()
{
this.View1.CustomFilter = GetFilter(this.Selected2, this.Selected3, this.Selected4);
this.View2.CustomFilter = GetFilter(this.Selected1, this.Selected3, this.Selected4);
this.View3.CustomFilter = GetFilter(this.Selected1, this.Selected2, this.Selected4);
this.View4.CustomFilter = GetFilter(this.Selected1, this.Selected2, this.Selected3);
}
private string GetFilter(string selected2, string selected3, string selected4)
{
var filter = "";
if (!string.IsNullOrWhiteSpace(selected2))
filter = "Name <> '" + selected2 + "' and ";
if(!string.IsNullOrWhiteSpace(selected3))
filter += "Name <> '" + selected3 + "' and ";
if (!string.IsNullOrWhiteSpace(selected4))
filter += "Name <> '" + selected4 + "' and ";
if (!string.IsNullOrWhiteSpace(filter))
filter = filter.Substring(0, filter.Length - 4);
return filter;
}
private string _selected2;
public string Selected2
{
get { return _selected2; }
set { _selected2 = value;
this.UpdateFilter();
}
}
private string _selected3;
public string Selected3
{
get { return _selected3; }
set { _selected3 = value;
this.UpdateFilter();
}
}
private string _selected4;
public string Selected4
{
get { return _selected4; }
set { _selected4 = value;
this.UpdateFilter();
}
}
public MyTest()
{
this.dt = new DataTable();
this.dt.Columns.Add("Name");
for (int i = 0; i < 15; i++)
{
var row = dt.NewRow();
row["Name"] = "Name " + i;
dt.Rows.Add(row);
}
View1 = new BindingListCollectionView(new DataView(dt));
View2 = new BindingListCollectionView(new DataView(dt));
View3 = new BindingListCollectionView(new DataView(dt));
View4 = new BindingListCollectionView(new DataView(dt));
}
}
usercontrol.cs
usercontrol.cs
public partial class ComboxFour : UserControl
{
private MyTest data;
public ComboxFour()
{
this.data = new MyTest();
InitializeComponent();
this.DataContext = data;
}
}
XAML
xaml
<StackPanel Orientation="Horizontal">
<ComboBox Width="100" Height="30" SelectedValue="{Binding Selected1}" ItemsSource="{Binding View1}" DisplayMemberPath="Name" SelectedValuePath="Name"/>
<ComboBox Width="100" Height="30" SelectedValue="{Binding Selected2}" ItemsSource="{Binding View2}" DisplayMemberPath="Name" SelectedValuePath="Name"/>
<ComboBox Width="100" Height="30" SelectedValue="{Binding Selected3}" ItemsSource="{Binding View3}" DisplayMemberPath="Name" SelectedValuePath="Name"/>
<ComboBox Width="100" Height="30" SelectedValue="{Binding Selected4}" ItemsSource="{Binding View4}" DisplayMemberPath="Name" SelectedValuePath="Name"/>
</StackPanel>
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