[英]Listbox with linq and multiple selection
有2個列表框:患者和會話。 根據第一個選擇中的多項選擇,需要在第二個中顯示過濾后的信息(使用linq查詢)。
帶注釋的字符串有效,但只允許在第一個列表框中選擇一個項目。
我絕對知道它成功收集了Patients to List變量,但是當我使用Contains時,第二個列表框為空。
private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
{
DataClasses1DataContext dbContext = new DataClasses1DataContext();
List<string> selectedItems = (from object o in listBox1.SelectedItems select listBox1.GetItemText(o)).ToList();
listBox2.DataSource = dbContext.Sessions
//.Where(pID => pID.PatientID == listBox1.GetItemText(listBox1.SelectedValue))
.Where(pID => selectedItems.Contains(pID.PatientID));
listBox2.DisplayMember = "Start";
listBox2.ValueMember = "SessionID";
}
會話和dbContext類的定義:
public partial class Session : INotifyPropertyChanging, INotifyPropertyChanged
{
...
public int SessionID
{
...
}
public string PatientID
{
...
}
}
public partial class DataClasses1DataContext : System.Data.Linq.DataContext
{
...
public System.Data.Linq.Table<Session> Sessions
{
...
}
}
我不知道您的listbox1中具有哪種類型的元素。 我假設類型名為Session
:
private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
{
DataClasses1DataContext dbContext = new DataClasses1DataContext();
List<string> selectedItems = (from object o in listBox1.SelectedItems select listBox1.GetItemText(o)).ToList();
listBox2.DataSource = dbContext.Sessions
.Where(pID => listBox1.SelectedItems.OfType<Session>().Select(x => x.PatientID).Contains(pID.PatientID));
listBox2.DisplayMember = "Start";
listBox2.ValueMember = "SessionID";
}
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