.net 绑定到不在列表中的值的可编辑组合框
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Editable ComboBox with binding to value not in list
提问by ronag
I have editable combobox where not always the preferred item is in the drop-down list.
我有可编辑的组合框，其中并不总是首选项目在下拉列表中。
I would like to have the possibility of manually entering text in the textbox which is propagated to the string bound to SelectedValue.
我希望有可能在文本框中手动输入文本，该文本将传播到绑定到 SelectedValue 的字符串。
Right now the string bound to SelectedValue is only updated if the entered value is on of the ones in the ComboBox items.
现在，绑定到 SelectedValue 的字符串仅在输入的值是 ComboBox 项中的值时才会更新。
How do I allow custom values not available in the ComboBox list to be manually entered and properly propagated to bound value?
如何允许手动输入 ComboBox 列表中不可用的自定义值并正确传播到绑定值？
回答by John Gardner
I was just doing this yesterday and today and it looks like the following:
我昨天和今天都在做这个，它看起来像下面这样：
set the combobox
IsEditable="true"instead of binding to
SelectedItem, bind to theTextproperty of the comboboxif you're binding to a custom object instead of just strings, you need to also set
TextSearch.TextPath="NameOfField". This lets the text search behavior work, and also shows this property in the textbox as well.
设置组合框
IsEditable="true"而不是绑定到
SelectedItem，绑定到Text组合框的属性如果要绑定到自定义对象而不仅仅是字符串，则还需要设置
TextSearch.TextPath="NameOfField". 这使文本搜索行为起作用，并且还在文本框中显示此属性。
All in all, I ended up with something like:
总而言之，我最终得到了类似的结果：
<ComboBox x:Name="c"
IsEditable="True"
IsTextSearchEnabled="True"
IsTextSearchCaseSensitive="False"
StaysOpenOnEdit="True"
Text="{Binding NameOnViewModel}"
TextSearch.TextPath="NameOnChildItems"
ItemsSource="{Binding Items}"
ItemTemplate="{StaticResource DataTemplate}" />
<TextBlock Text="{Binding ElementName=c,Path=Text}" />
回答by Rauld
Setting the binding to Text property of Combo will suffice as well.
将绑定设置为 Combo 的 Text 属性也足够了。
<ComboBox IsTextSearchEnabled="True" IsEditable="True"
ItemsSource="{Binding Items}" Text="{Binding SelectedItemText, Mode=TwoWay}" />
