WPF以编程方式在列表框中选择多个项目 [英] WPF select multiple items in a listbox programmatically

问题描述

我试图找出在从数据库中检索数据后如何选择列表框中的某些项目，但我不知道如何。 以下是我到目前为止：

 lb_temp.DisplayMemberPath = "关键英寸; 
 lb_temp.SelectedValuePath =" Value" ;; 
 
 lb_temp.Items.Add（new KeyValuePair< string，string>（" YES"，" Y"））; 
 lb_temp.Items.Add（new KeyValuePair< string，string>（" NO"，" N"））;  
 
 for（int i = 0; i< lb_temp.Items.Count; i ++）
 {  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP;&NBSP;&NBSP; 
  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; 
 ListBoxItem lbi =（ListBoxItem）lb_temp.ItemContainerGenerator.ContainerFromIndex（i）;  &NBSP; &NBSP; 
  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; 
 if（lbi.Content.ToString（）==" N"）
 lbi.IsSelected = true;  &NBSP; &NBSP; 
  &NBSP; &NBSP; &NBSP; &NBSP; 
} 

我遇到的问题是lbi.Content.ToString（）返回值{[NO，N]}。 我不确定如何获得'N'。

解决方案

你好wegoodwin，

根据你的描述，你在ListBox中添加字典，然后你想从ListBoxItem获取字典值，我做一个你的样本可以看看。

< ListBox Name =" listbox" ItemsSource =" {Binding dic}"的SelectionChanged = QUOT; listbox_SelectionChanged"> 
< ListBox.ItemTemplate> 
< DataTemplate> 
< StackPanel Orientation =" Horizo​​ntal"> 
< TextBlock Width =" 50" Text =" {Binding Key}" /> 
< TextBlock Text =" {Binding Value}" /> 
< / StackPanel> 
< / DataTemplate> 
< /ListBox.ItemTemplate> 
< / ListBox> 

 public partial class Window18：Window 
 {
 public Dictionary< string，string> dic {get;组; } 
 public Window18（）
 {
 InitializeComponent（）; 
 dic = new Dictionary< string，string>（）; 
 dic.Add（" Yes"，" Y"）; 
 dic.Add（"No"，"N"）; 
 
 this.DataContext = this; 
} 
 
 private void listbox_SelectionChanged（object sender，SelectionChangedEventArgs e）
 {
 var selectedItem =（KeyValuePair< string，string>）listbox.SelectedItem; 
 string item = selectedItem.Value; 
 Console.WriteLine（item）; 
 
} 
} 

最好的问候，

Cherry

I am trying to figure out how select certain items in a listbox after I retrieve data from a database, but I am at a loss as to how.  Here is what I have so far:

lb_temp.DisplayMemberPath = "Key";
lb_temp.SelectedValuePath = "Value";

lb_temp.Items.Add(new KeyValuePair<string, string>("YES", "Y"));
lb_temp.Items.Add(new KeyValuePair<string, string>("NO", "N")); 

for (int i = 0; i < lb_temp.Items.Count; i++)
{              
                  
ListBoxItem lbi = (ListBoxItem)lb_temp.ItemContainerGenerator.ContainerFromIndex(i);     
                   
if (lbi.Content.ToString() == "N")
lbi.IsSelected = true;     
           
}

The problem that I have is that lbi.Content.ToString() returns the value {[NO,N]}.  I am not sure how to just get the 'N'.

解决方案

Hi wegoodwin,

According to your description, you add dictionary in ListBox, then you want to get Dictionary value from ListBoxItem, I do one sample that you can take a look.

<ListBox Name="listbox" ItemsSource="{Binding dic}" SelectionChanged="listbox_SelectionChanged">
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <StackPanel Orientation="Horizontal">
                        <TextBlock Width="50" Text="{Binding Key}" />
                        <TextBlock Text="{Binding Value}" />
                    </StackPanel>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>

public partial class Window18 : Window
    {
        public Dictionary<string,string> dic { get; set; }
        public Window18()
        {
            InitializeComponent();
            dic = new Dictionary<string, string>();
            dic.Add("Yes","Y");
            dic.Add("No", "N");

            this.DataContext = this;
        }

        private void listbox_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            var selectedItem = (KeyValuePair<string, string>)listbox.SelectedItem;
            string item = selectedItem.Value;
            Console.WriteLine(item);
            
        }
    }

Best Regards,

Cherry

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