XAML ComboBox错误WPF

Question

我的XAML出现了一个奇怪的错误。 我在WPF上为设计人员添加了一个组合框。 我和设计师一起给了这个组合框2件商品。 我该如何解决？ 该组合框称为：cb_gender。 项目：男女

XAML：

<Window xmlns:xctk="http://schemas.xceed.com/wpf/xaml/toolkit"  x:Class="HotelWPFGoedeVersie.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:HotelWPFGoedeVersie"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <Grid Name="grid_mainwindow" HorizontalAlignment="Left" Height="321" Margin="0,0,0,-0.2" VerticalAlignment="Top" Width="518">
            <Grid Name="grid_logo" HorizontalAlignment="Left" Height="80" Margin="377,0,0,0" VerticalAlignment="Top" Width="141">
                <Border BorderThickness="1">
                    <Ellipse Fill="#00FF00" HorizontalAlignment="Left" Height="79" Stroke="Black" VerticalAlignment="Top" Width="90" Margin="29.2,0.2,0,-0.8"/>
                </Border>
            </Grid>
            <Line Fill="#FF0000" Name="redline" Stroke="Black" StrokeThickness="4" X1="0" X2="133.6" Y1="70" Y2="70" Margin="385,-29,0,259" />
            <GroupBox x:Name="gb_newreservation" Header="New Reservation" HorizontalAlignment="Left" Height="263" Margin="19,10,0,0" VerticalAlignment="Top" Width="311">
                <Grid Name ="grid_reservation" HorizontalAlignment="Left" Height="225" Margin="10,10,0,0" VerticalAlignment="Top" Width="282">
                    <Label x:Name="lbl_name" Content="Name:" HorizontalAlignment="Left" Margin="0,19,0,0" VerticalAlignment="Top" RenderTransformOrigin="0.443,-0.789"/>
                    <TextBox x:Name="tb_name" HorizontalAlignment="Left" Height="23" Margin="121,23,0,0" TextWrapping="Wrap" Text="Name" VerticalAlignment="Top" Width="120"/>
                    <Label x:Name="lbl_address" Content="Address:" HorizontalAlignment="Left" Margin="0,58,0,0" VerticalAlignment="Top"/>
                    <TextBox x:Name="tb_address" HorizontalAlignment="Left" Height="22" Margin="121,62,0,0" TextWrapping="Wrap" Text="Address" VerticalAlignment="Top" Width="120"/>
                    <Label x:Name="lbl_room" Content="Room:" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="0,147,0,0"/>
                    <Label x:Name="lbl_date" Content="Date:" HorizontalAlignment="Left" Margin="0,190,0,0" VerticalAlignment="Top" RenderTransformOrigin="0.193,-0.07"/>
                    <DatePicker Name="dp_date"  HorizontalAlignment="Left" Margin="121,192,0,0" VerticalAlignment="Top" FirstDayOfWeek="Monday" Width="120"/>
                    <ComboBox x:Name="cb_room" HorizontalAlignment="Left" Margin="121,150,0,0" VerticalAlignment="Top" Width="120" SelectedIndex="0" IsEditable="True"/>
                    <Label x:Name="lbl_gender" Content="Gender:" HorizontalAlignment="Left" Margin="0,89,0,0" VerticalAlignment="Top"/>
                    <ComboBox x:Name="cb_gender" HorizontalAlignment="Left" Margin="121,92,0,0" VerticalAlignment="Top" Width="120" SelectedIndex="0" IsEditable="True">
                        <ComboBoxItem Content="Male" HorizontalAlignment="Left" Width="118.4" />
                        <ComboBoxItem Content="Female" HorizontalAlignment="Left" Width="118.4"/>
                    </ComboBox>
                    <DatePicker Name="dp_birthday" HorizontalAlignment="Left" Margin="121,121,0,0" VerticalAlignment="Top" Width="120"/>
                    <Label x:Name="lbl_birthday" Content="Day of Birth: " HorizontalAlignment="Left" Margin="0,121,0,0" VerticalAlignment="Top"/>

                </Grid>

            </GroupBox>
            <Button x:Name="btn_addreservation" Content="Add Reservation" HorizontalAlignment="Left" Margin="19,278,0,0" VerticalAlignment="Top" Width="103" Height="26" Click="btn_addreservation_Click"/>
            <Button x:Name="btn_deletereservation" Content="Delete Reservation" HorizontalAlignment="Left" Margin="218,278,0,0" VerticalAlignment="Top" Width="103" Height="26"/>
        </Grid>

    </Grid>
</Window>

这是错误：

错误CS1061'MainWindow'不包含>'ComboBoxItem_Selected'的定义，并且找不到扩展方法'ComboBoxItem_Selected'>接受类型为'MainWindow'的第一个参数（您是否丢失了>使用指令或程序集引用？）

Answer 1

第一次检查

看看ComboBoxItem上的属性窗口

错误CS1061'MainWindow'不包含'ComboBoxItem_Selected'的定义，并且找不到扩展方法'ComboBoxItem_Selected'>可以接受类型为'MainWindow'的第一个参数（您是否丢失了>使用指令或程序集引用？）

没有绑定事件时，会发生此错误。 在.cs寻找ComboBoxItem_Selected事件存根。 键入事件名称或双击属性窗口的项目会自动生成带有有效参数的事件存根，但是您在编码时可能不小心删除了它。

如果您的.cs没有方法存根，则将其保留为空白，如上图所示。 但是，如果您有方法存根，请在输入框中键入确切的事件名称。

进一步检查

如果您的代码后面有事件方法存根，并且已正确地将方法绑定到事件，那么现在该仔细看一下方法的参数了。 就用户操作而言，类似的事件可能具有完全不同的事件参数。

例如。

// Click event
private void Click(object sender, RoutedEventArgs e) { ... }

// MouseDown event
private void MouseDown(object sender, MouseButtonEventArgs e) { ... }

// Users can fire both events above by mouse click.

第二个参数是不同的，太不同了。 请确保您为事件指定了有效的参数。