MVVMLight

太过爱你忘了你带给我的痛 2022-07-15 10:39 139阅读 0赞

# MVVMLight随便讲讲 #

推荐链接及博客：

*  **[http://www.cnblogs.com/manupstairs/p/4890300.html][http_www.cnblogs.com_manupstairs_p_4890300.html]**
 *  **[http://blog.csdn.net/andrew\_wx/article/details/37757147][http_blog.csdn.net_andrew_wx_article_details_37757147]**
 *  **[http://www.cnblogs.com/yuefei/p/3799430.html][http_www.cnblogs.com_yuefei_p_3799430.html]**

--------------------

## 注意点 ##

> View实体类（即MVVM里面的Model层）继承ObservableObject。  
> 而ObservableObject已经继承了INotityPropertyChanged属性变更通知接口。  
> 注意下面代码的set方法和RaisePropertyChanged方法。

public class Person : ObservableObject
        {
            private string _Name;
            public string Name
            {
                get
                {
                    return _Name;
                }
                set
                {
                    Set(ref _Name, value);
                }
            }
    
            private int _Age;
            public int Age
            {
                get
                {
                    return _Age;
                }
                set
                {
                    _Age = value;
                    RaisePropertyChanged("Age");
                }
            }
     otityPropertyChanged
           }

> 每个ViewModel类都将继承MVVMLight的 ViewModelBase 为父类  
> 1、MVVM里面的VM（即ViewModel）继承了ViewModelBase，而ViewModelBase其实也继承了INotityPropertyChanged，但是它是先继承ObservableObject，而ObservableObject继承了INotityPropertyChanged。  
> 2、当RaisePropertyChanged的属性名称参数为空，而通过编译器可以智能加上，可以通过反编译工具知晓，这点改进这点很人性化。

public class PersonViewModel : ViewModelBase
        {
            public PersonViewModel()
            {
                Persons = SetItems();
                AddPersonCommand = new RelayCommand(AddPerson);
                EditPersonCommand = new RelayCommand(EditPerson);
            }
    
            private ObservableCollection<Person> _Persons;
            public ObservableCollection<Person> Persons
            {
                get
                {
                    return _Persons;
                }
                set
                {
                    _Persons = value;
                    //这边加与不加RaisePropertyChanged()我认为是没有区别的。
                    //RaisePropertyChanged();
                }
            }
    
            public ICommand AddPersonCommand { get; set; }
    
            public ICommand EditPersonCommand { get; set; }
    
            private ObservableCollection<Person> SetItems()
            {
                var items = new ObservableCollection<Person>();
                foreach (var item in Enumerable.Range(0, 10))
                {
                    Person p = new Person()
                    {
                        Name = "Name" + item,
                        Age = item
                    };
                    items.Add(p);
                }
                return items;
            }
    
            private void AddPerson()
            {
                Persons.Add(new Person { Name = "织田信长", Age = 28 });
            }
    
            private void EditPerson()
            {
                Persons.First().Name = "丰城秀吉";
                Persons[Persons.Count - 2].Name = "德川家康";
                Persons[Persons.Count - 1].Age = 70;
            }
        }

[http_www.cnblogs.com_manupstairs_p_4890300.html]: http://www.cnblogs.com/manupstairs/p/4890300.html
[http_blog.csdn.net_andrew_wx_article_details_37757147]: http://blog.csdn.net/andrew_wx/article/details/37757147
[http_www.cnblogs.com_yuefei_p_3799430.html]: http://www.cnblogs.com/yuefei/p/3799430.html