集合属性应为只读 [英] Collection properties should be read only

问题描述

我使用的FxCop为我的WPF MVVM组装，这让我

集合属性应该是只读的误差

但在我的财产，我需要RaisePropertyChangedEvent，现在如果我设置为仅通过删除其设定部分，我怎么能引发此事件读取属性。

语法是有点像这样

 公开名单的员工
 {
 {返回_employees; } 
组
 {
如果（的ReferenceEquals（_employees，值））
的回报; 
 _employees =价值; 
 RaisePropertyChanged（员工）; 
} 
} 
  

解决方案

您应该很少需要在集合提出一个PropertyChanged事件。使集合观察到的，这样它会通知每当项目添加或删除的任何绑定：

 公开的IList<员工>员工
 {
获得; 
私人集; 
} 
 
 //在构造函数：
 this.Employees =新的ObservableCollection<员工>（）; 
  

I am using FxCop for my WPF MVVM assembly and it gives me the error

Collection properties should be read only

But in my property i need to RaisePropertyChangedEvent, now if i set the property to read only by removing its set section, how could i raise this event.

Syntax is somewhat like this

public List Employees
{
    get { return _employees; }
    set
    {
        if (ReferenceEquals(_employees, value))
            return;
        _employees = value;
        RaisePropertyChanged("Employees");
    }
}

解决方案

You should rarely need to raise a PropertyChanged event on a collection. Make the collection observable so that it notifies any bindings whenever items are added or removed:

public IList<Employee> Employees
{
    get; 
    private set;
}

// in your constructor:
this.Employees = new ObservableCollection<Employee>();

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