TextBox.BeforeTextChanging Событие

Определение

Пространство имен:

Microsoft.UI.Xaml.Controls

Происходит синхронно, когда текст в текстовом поле начинает изменяться, но до обновления свойства Text .

// Register
event_token BeforeTextChanging(TypedEventHandler<TextBox, TextBoxBeforeTextChangingEventArgs const&> const& handler) const;

// Revoke with event_token
void BeforeTextChanging(event_token const* cookie) const;

// Revoke with event_revoker
TextBox::BeforeTextChanging_revoker BeforeTextChanging(auto_revoke_t, TypedEventHandler<TextBox, TextBoxBeforeTextChangingEventArgs const&> const& handler) const;

public event TypedEventHandler<TextBox,TextBoxBeforeTextChangingEventArgs> BeforeTextChanging;

function onBeforeTextChanging(eventArgs) { /* Your code */ }
textBox.addEventListener("beforetextchanging", onBeforeTextChanging);
textBox.removeEventListener("beforetextchanging", onBeforeTextChanging);
- or -
textBox.onbeforetextchanging = onBeforeTextChanging;

Public Custom Event BeforeTextChanging As TypedEventHandler(Of TextBox, TextBoxBeforeTextChangingEventArgs) 

<TextBox BeforeTextChanging="eventhandler"/>

Тип события

TypedEventHandler<TextBox,TextBoxBeforeTextChangingEventArgs>

См. также раздел

• TextBoxBeforeTextChangingEventArgs