Question

我得到以下ComboBox：

<ComboBox Margin="5" SelectedValue="{Binding NewCourseWeekday, Mode=TwoWay}" Grid.Row="5" Grid.Column="1">
    <ComboBoxItem>Monday</ComboBoxItem>
    <ComboBoxItem>Tuesday</ComboBoxItem>
    <ComboBoxItem>Wednesday</ComboBoxItem>
    <ComboBoxItem>Thursday</ComboBoxItem>
    <ComboBoxItem>Friday</ComboBoxItem>
</ComboBox>

我有setter / getter：

public String NewCourseWeekday
{
    get { return _newCourseWeekday; }
    set
    {
        _newCourseWeekday = value;
        OnPropertyChanged();
    }
}

但是，如果我尝试使用此_newCourseWeekday，它并不仅仅包含工作日，但它包含System.Windows.Controls.ComboBoxItem: Monday之类的内容。我怎样才能选择字符串？

Answer 1

您应该将CascadeExpression个对象添加到string并将其ComboBox属性绑定到您的SelectedItem源属性：

NewCourseWeekday

<ComboBox Margin="5" SelectedItem="{Binding NewCourseWeekday, Mode=TwoWay}" Grid.Row="5" Grid.Column="1" xmlns:s="clr-namespace:System;assembly=mscorlib"> <s:String>Monday</s:String> <s:String>Tuesday</s:String> <s:String>Wednesday</s:String> <s:String>Thursday</s:String> <s:String>Friday</s:String> </ComboBox>属性不能设置为string值。

Answer 2

通过指定所选值是项目的实际内容而不是ComboBoxItem本身，您应该能够获得您期望的字符串。为此，请使用SelectedValuePath属性，并将其设置为Content。

<ComboBox Margin="5" SelectedValuePath="Content" SelectedValue="{Binding NewCourseWeekday}" Grid.Row="5" Grid.Column="1">
    <ComboBoxItem>Monday</ComboBoxItem>
    <ComboBoxItem>Tuesday</ComboBoxItem>
    <ComboBoxItem>Wednesday</ComboBoxItem>
    <ComboBoxItem>Thursday</ComboBoxItem>
    <ComboBoxItem>Friday</ComboBoxItem>
</ComboBox>

Answer 3

你必须将NewCourseWeekday绑定到SelectedItem而不是绑定到SelectedValue

获得ComboBox的价值

3 个答案: