我有一个 ComboBox
与 ObservableCollection
绑定(bind).当用户在 ComboBox
中输入文本时我该怎么办? ,如果项目不在列表中,代码会自动将新项目添加到列表中吗?
<ComboBox Name="cbTypePLC"
Height="22"
ItemsSource="{StaticResource TypePLCList}"
SelectedItem="{Binding TypePLC}" IsReadOnly="False" IsEditable="True">
</ComboBox>
最佳答案
将组合框的 Text 属性绑定(bind)到 View 模型项,然后添加到那里的绑定(bind)集合中,例如,
Text="{Binding UserEnteredItem, UpdateSourceTrigger=LostFocus}"
将 UpdateSourceTrigger 更改为 LostFocus,因为默认 (PropertyChanged) 会将每个字符更改传达给您的 View 模型。
// user entered value
private string mUserEnteredItem;
public string UserEnteredItem {
get {
return mUserEnteredItem;
}
set {
if (mUserEnteredItem != value) {
mUserEnteredItem = value;
TypePLCList.Add (mUserEnteredItem);
// maybe you want to set the selected item to user entered value
TypePLC = mUserEnteredItem;
}
}
}
// your selected item
private string mTypePLC;
public string TypePLC {
get {
return mTypePLC;
}
set {
if (mTypePLC != value) {
mTypePLC = value;
// notify change of TypePLC INPC
}
}
}
// your itemsource
public ObservableCollection <string> TypePLCList { set; private set;}
关于WPF - 组合框 - 当用户在组合中输入文本时添加项目,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/17805798/