我已經建立了一個自定義組合框,顯示當只讀設置一個文本框:WPF自定義組合框初始值設定
<local:BoolToVisibilityConverter FalseValue="Hidden" TrueValue="Visible" x:Key="BoolVis" />
<local:BoolToVisibilityConverter FalseValue="Visible" TrueValue="Hidden" x:Key="BoolVisRev" />
<Style TargetType="{x:Type local:ComboBoxG}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type local:ComboBoxG}">
<Border Background="{TemplateBinding Background}"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}">
<Grid>
<ComboBox ItemsSource="{TemplateBinding ItemsSource}"
DisplayMemberPath="{TemplateBinding DisplayMemberPath}"
SelectedValuePath="{TemplateBinding SelectedValuePath}"
SelectedIndex="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=SelectedIndex, Mode=TwoWay}"
Visibility="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=IsReadOnly, Converter={StaticResource BoolVisRev}}"
IsDropDownOpen="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=IsDropDownOpen, Mode=TwoWay}"
IsTabStop="False">
</ComboBox>
<TextBox Text="{TemplateBinding Text}"
Visibility="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=IsReadOnly, Converter={StaticResource BoolVis}}"
IsTabStop="False">
</TextBox>
</Grid>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
它的正常工作,除了如果我實例化,並設置一個值都一氣呵成。這不工作...
private void One_OnClick(object sender, RoutedEventArgs e)
{
cmb = new ComboBoxG();
Stack.Children.Add(cmb);
var dict = new Dictionary<int, string> { { 0, "aaa" }, { 1, "bbb" }, { 2, "ccc" }, { 3, "ddd" }, };
cmb.ItemsSource = dict;
cmb.DisplayMemberPath = "Value";
cmb.SelectedValuePath = "Key";
cmb.SelectedValue = 3;
}
......而這樣做......
private void One_OnClick(object sender, RoutedEventArgs e)
{
cmb = new ComboBoxG();
Stack.Children.Add(cmb);
var dict = new Dictionary<int, string> { { 0, "aaa" }, { 1, "bbb" }, { 2, "ccc" }, { 3, "ddd" }, };
cmb.ItemsSource = dict;
cmb.DisplayMemberPath = "Value";
cmb.SelectedValuePath = "Key";
cmb.Loaded += cmb_Loaded;
}
private void cmb_Loaded(object sender, RoutedEventArgs e)
{
cmb.SelectedValue = 3;
}
所以我可以解決它,但它正在使勁兒此控件的一些用途。有什麼建議嗎?
謝謝,我很高興這不僅僅是我。這是一個很好的解決方案。對於我現實世界中的大多數情況,價值將來自綁定,所以解決方法是關於更改綁定發生的時間。抱歉,我無法投票回答您的答案,但我還沒有獲得足夠的聲望點。 – johndsamuels