我正在使用MVVM Light构建WPF应用程序。我在窗口中添加了一个菜单，其中包含标准的文件和编辑菜单：
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package tp1;
/**
*
* @author Nelson
*/
public class Vehicle {
/** Variáveis da classe, têm como função **/
private String registration;
private int registrationYear;
private double consumption;
private double autonomy;
private int cilinderCapacity;
/**
* Final variables. They are final because they do not suffer any kind of modification during the project.
* YEAR_OMISSION is 2016 because the currect year is 2016.
* ENVIRONMENTAL_CHARGE_OMISSION is 0.10(10 cents), gave this value because there is nothing to mention the
especific value, hence why I gave 0.10.
* RATING_RECENT = Is a string, just has the text "RECENT" inside.
* RATING_COMTEMPORY - Another string, just with the "Comtempory" text inside.
* RATING_CLASSIC - Yet again another string, with the "Classic" text.
* AGE_RECENT - It is to help to compare if a vehicle is recent or not, it has the value 3.
* AGE_CLASSIC - It is to again help to compare, value is 20.
*/
private static final int YEAR_OMISSION = 2016;
private static final double ENVIRONMENTAL_CHARGE_OMISSION=0.10;
private static final String RATING_RECENT="Recent";
private static final String RATING_CONTEMPORY="Contempory";
private static final String RATING_CLASSIC="Classic";
private static int AGE_RECENT=1;
private static final int AGE_CLASSIC=20;
/**
* Constructor of the object, it has the Registration
* @param registration
* @param registrationYear - The year the vehicle was first registered.
* @param consumption - How many liters the vehicle consumes.
* @param autonomy - How many KMs a vehicle can go without refuelling.
* @param cilinderCapacity - How many Cubic Inches the engine has.
*/
public Vehicle(String registration,int registrationYear, double consumption, double autonomy, int cilinderCapacity) {
this.registration = registration;
this.registrationYear = registrationYear;
this.consumption = consumption;
this.autonomy = autonomy;
this.cilinderCapacity = cilinderCapacity;
}
/**
* Null Constructor, it has no values, they will be attributed in the MAIN Class.
*/
public Vehicle() {
this.registration = "";
this.registrationYear = 0;
this.consumption = 0;
this.autonomy = 0;
this.cilinderCapacity =0;
this.registrationYear = YEAR_OMISSION;
}
/**
* Copy Constructor.
*/
public Vehicle(Vehicle vehicle) {
this.registration = vehicle.getRegistration();
this.registrationYear = vehicle.getRegistrationYear();
this.consumption = vehicle.getConsumption();
this.autonomy = vehicle.getAutonomy();
this.cilinderCapacity = vehicle.getCilinderCapacity();
}
public String getRegistration() {
return registration;
}
public int getRegistrationYear() {
return registrationYear;
}
public double getConsumption() {
return consumption;
}
public double getAutonomy() {
return autonomy;
}
public int getCilinderCapacity() {
return cilinderCapacity;
}
public double getYearRecent() {
return AGE_RECENT;
}
public double getAgeRecent(){
return AGE_RECENT;
}
public void setRegistration(String registration) {
this.registration = registration;
}
public void setRegistrationYear(int registrationYear) {
this.registrationYear = registrationYear;
}
public void setConsumption(double consumption) {
this.consumption = consumption;
}
public void setAutonomy(double autonomy) {
this.autonomy = autonomy;
}
public void setCilinderCapacity(int cilinderCapacity) {
this.cilinderCapacity = cilinderCapacity;
}
public void setAgeRecent() {
Vehicle.AGE_RECENT = 3;
}
/**
* Calculate the age of the vehicle to compare in the vehicleRating method
* @return The year, which is 2016 minus the year the vehicle was first registered.
*/
private int calculateAge(){
return YEAR_OMISSION-this.registrationYear;
}
/**
* Calculate the Circulation Tax.
* @return Returns the value of the Environmental Charge multiplied by the Cilinder Capacity of the vehicle.
*/
public double calculateCirculationTax(){
return ENVIRONMENTAL_CHARGE_OMISSION*cilinderCapacity;
}
/**
* Classify the vehicle based on the age.
* If the result given by the calculateAge method is minor than the AGE_RECENT variable(3), then it will
return "Recent"
* If the result is between Age_RECENT and AGE_CLASSIC(20), then it will say "Contemporary"
* If none of the IFs apply, it will return "Classic".
**/
public static String vehicleRating(Vehicle vehicle) {
if(vehicle.calculateAge() < Vehicle.AGE_RECENT) {
return Vehicle.RATING_RECENT; }
else if ((vehicle.calculateAge()>=Vehicle.AGE_RECENT)&&(vehicle.calculateAge()<=Vehicle.AGE_CLASSIC)){
return Vehicle.RATING_CONTEMPORY;}
else
return Vehicle.RATING_CLASSIC;
}
@Override
public String toString() {
return "Vehicle{" + "registration=" + registration + ", registrationYear=" + registrationYear + ", consumption=" + consumption + ", autonomy=" + autonomy + ", cilinderCapacity=" + cilinderCapacity + '}';
}
}
现在，如果我运行应用程序并在其中一个<Window x:Class="ParserEditor.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:ParserEditor"
xmlns:ignore="http://www.galasoft.ch/ignore"
xmlns:i="clr namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
xmlns:cmd="clr-namespace:GalaSoft.MvvmLight.Command;assembly=GalaSoft.MvvmLight.Extras.WPF4"
mc:Ignorable="d ignore"
Closing="Window_Closing"
DataContext="{Binding Main, Source={StaticResource Locator}}"
Height="{Binding Height, Mode=TwoWay}"
MaxHeight="{Binding MaxHeight, Mode=TwoWay}"
MinHeight="{Binding MinHeight, Mode=TwoWay}"
MinWidth="450"
Width="450"
Title="{Binding WindowTitle}">
<Window.InputBindings>
<KeyBinding Command="{Binding NewParserCommand}" Gesture="CTRL+N" />
<KeyBinding Command="{Binding OpenParserCommand}" Gesture="CTRL+O" />
<KeyBinding Command="{Binding SaveParserCommand}" Gesture="CTRL+S" />
<KeyBinding Command="{Binding SaveParserAsCommand}" Gesture="ALT+A" />
<KeyBinding Command="{Binding ExitCommand}" Gesture="ALT+F4" />
<KeyBinding Command="{Binding ApplicationCommands.Undo}" Gesture="CTRL+Z" />
<KeyBinding Command="{Binding ApplicationCommands.Redo}" Gesture="CTRL+Y" />
<KeyBinding Command="{Binding ApplicationCommands.Cut}" Gesture="CTRL+X" />
<KeyBinding Command="{Binding ApplicationCommands.Copy}" Gesture="CTRL+C" />
<KeyBinding Command="{Binding ApplicationCommands.Paste}" Gesture="CTRL+V" />
<KeyBinding Command="{Binding ApplicationCommands.Delete}" Gesture="DEL" />
<KeyBinding Command="{Binding ApplicationCommands.SelectAll}" Gesture="CTRL+A" />
</Window.InputBindings>
<DockPanel Name="Dock">
<Menu IsMainMenu="true" DockPanel.Dock="Top">
<MenuItem Header="_File">
<MenuItem Header="_New..." InputGestureText="Ctrl-N" Command="{Binding NewParserCommand}" />
<MenuItem Header="_Open..." InputGestureText="Ctrl-O" Command="{Binding OpenParserCommand}" />
<MenuItem Header="_Save..." InputGestureText="Ctrl-S" Command="{Binding SaveParserCommand}" />
<MenuItem Header="Save _As..." InputGestureText="Alt-A" Command="{Binding SaveParserAsCommand}" />
<Separator />
<MenuItem Header="E_xit" InputGestureText="Alt-F4" Command="{Binding ExitCommand}" />
</MenuItem>
<MenuItem Header="_Edit">
<MenuItem Header="Undo" InputGestureText="Ctrl-Z" />
<MenuItem Header="Redo" InputGestureText="Ctrl-Y" />
<Separator/>
<MenuItem Header="Cut" InputGestureText="Ctrl-X" />
<MenuItem Header="Copy" InputGestureText="Ctrl-C" />
<MenuItem Header="Paste" InputGestureText="Ctrl-V" />
<MenuItem Header="Delete" InputGestureText="Del" />
<MenuItem Header="Select All" InputGestureText="Ctrl-A" />
</MenuItem>
</Menu>
<Grid x:Name="LayoutRoot">
<!-- Some controls, including TextBlocks & TextBoxes here -->
</Grid>
</DockPanel>
</Window>
控件中进行一些编辑，我可以使用常用的键盘快捷键来剪切，复制和放大。粘贴文本，撤消＆amp;重点是重做动作是控件。但是，如果我点击我的编辑菜单并使用我的一个选项，那么没有任何反应。
如何让菜单项生效？
答案 0 :(得分：0)
我想出来了。在发布问题＆amp;在查看XAML时，我注意到Edit菜单项没有绑定任何命令。我将所需的Command="ApplicationCommands.xxx"语句添加到XAML＆amp;现在编辑菜单工作。