wpf Relay/ICommand vs DelegateCommand——差异
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Relay/ICommand vs DelegateCommand -- Differences
提问by KeyboardFriendly
As far as I can tell the below code can be changed from Relay/ICommand Command to Delegate command and still bind the commands the same way! If I am wrong what are the differences and uses of each.
据我所知，下面的代码可以从 Relay/ICommand 命令更改为 Delegate 命令，并且仍然以相同的方式绑定命令！如果我错了，每个的区别和用途是什么。
private DelegateCommand something;
public DelegateCommand Something
Here is the full implementation
这是完整的实现
private RelayCommand something;
public ICommand Something
{
get
{
if (something == null)
something = new RelayCommand(SomethingMethod, CanSomething);
return something;
}
}
private bool CanSomething(object parameter)
{
//just for readability return true
return true;
}
private void SomethingMethod(object parameter)
{
using (DatabaseContext context = new DatabaseContext())
{
try { }
catch(Exception ex)
{
throw new ApplicationException(string.Format("Something {0} to {1}", file, directory), ex);
}
}
}
回答by Reed Copsey
Neither DelegateCommandnor RelayCommandexist in the framework itself. They are provided by third party libraries.
既不存在DelegateCommand也不RelayCommand存在于框架本身。它们由第三方库提供。
Both are an implementation of ICommandwhich works by accepting a delegate and using that to provide the ICommandimplementation. As such, both classes have the same intent, and work in basically the same manner.
两者都是ICommand通过接受委托并使用它来提供ICommand实现来工作的实现。因此，两个类具有相同的意图，并且以基本相同的方式工作。
As for differences - there may be some subtle diffferences, depending on which framework you're using. For example, Prism's DelegateCommand<T>also has a concept of IActiveAware, which is used for building composite commands.
至于差异 - 可能会有一些细微的差异，具体取决于您使用的框架。比如 Prism'sDelegateCommand<T>也有一个 的概念IActiveAware，用于构建复合命令。
