如何从多个选定的列表视图中获取选定的值

问题描述

您好，我在xaml中有多个选择的listview：

Hello, I have listview with multiple selection in xaml:

<ListView  Name="dgDane" SelectionMode="Multiple" ItemsSource="{Binding Dane}" HorizontalAlignment="Left" Margin="22,79,0,0" VerticalAlignment="Top" Height="310" Width="645">
<ListView.View>
    <GridView>
        <GridViewColumn  DisplayMemberBinding="{Binding Path = ID}" Width="30"/>
        <GridViewColumn  DisplayMemberBinding="{Binding Path = Nazwa}" Header="Nazwa"/>
        <GridViewColumn  DisplayMemberBinding="{Binding Path = Metoda}" Header="Metoda badawcza"/>
        <GridViewColumn  DisplayMemberBinding="{Binding Path = Jednostka}" Header="Jednostka"/>
    </GridView>
</ListView.View>

列表视图是填充了linq-to-sql：

The listview is filled with a linq-to-sql:

public class Dane
{
    public string ID { get; set; }
    public string Nazwa { get; set; }
    public string Metoda { get; set; }
    public string Jednostka { get; set; }
}

back_clasesDataContext dc = new back_clasesDataContext();
var dane = (from k in dc.tblDanes
    where (k._1 == 2 && k.Aktywne == true)
        select new Dane { ID = k.Id_Osoby, Nazwa = k.Nazwa, Metoda = k.Metoda, Jednostka = k.Jednostka }).ToList();
dgDane.ItemsSource = dane;

我希望从这个多列列表视图中获取ID形式的选定值。 />
先谢谢。



我尝试过：



当我的列表视图中选择了多个项目时，我会尝试获取ID：

I want to get ID form selected values from this multi-column listview.
Thanks in advance.

What I have tried:

And when multiple items are selected on my listview, I try to get the ID:

foreach (DataRowView objDataRowView in dgDane.SelectedItems)
{
    MessageBox.Show(objDataRowView["ID"].ToString());
}

我收到错误：

I getting an error:

An unhandled exception of type 'System.InvalidCastException' occurred in crl.exe
Additional information: Additional information: Unable to cast object of type 'crl.Dane' to type 'System.Data.DataRowView'.

推荐答案

foreach (var selectedDane in dgDane.SelectedItems)
{
  MessageBox.Show(selectedDane.ID);
}

因此，如果只需要收集或修改 Dane 个实例， ，他们已经在那里了！



编辑：MTH

哎呀，我忘了SelectedItems不是特定于类型的。

两种解决方法：

So if all you need to do it to collect or modify the Dane instances, themselves, they're already there!

MTH
Oops, I forgot that SelectedItems is not type-specific.
Two ways to fix it:

// this will depend on: using System.Linq;
foreach (var selectedDane in dgDane.SelectedItems.Cast<Dane>())
{
  MessageBox.Show(selectedDane.ID);
}

或

or

foreach (var sel in dgDane.SelectedItems)
{
  Dane selectedDane = (Dane)sel;
  MessageBox.Show(selectedDane.ID);
}

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