MVVM Light RelayCommand参数

Question

我在使用GalaSoft MVVM Light框架将参数传递给relaycommand时遇到了问题。我知道MVVM光的实现relaycommand的不使用拉姆达参数，所以我做了一些研究，发现了一种方法，人们围绕它的工作做这样的事情：

public RelayCommand ProjMenuItem_Edit 
{ 
    get 
    { 
     if (_projmenuItem_Edit == null) 
     { 
      //This should work.... 
      _projmenuItem_Edit = new RelayCommand(ProjEditNode); 
     } 
     return _projmenuItem_Edit; 
    } 
} 

private void ProjEditNode(object newText) 
{ 
    var str = newText as string; 
    OrganLocationViewModel sel = 
     ProjectOrganLocationView.GetExtendedTreeView().GetTopNode(); 

    //Console.WriteLine(sel.OrganDisplayName); 
    sel.OrganDisplayName = str; 
} 

不过，我不断收到一条错误线_projmenuItem_Edit = new RelayCommand(ProjEditNode);，说Argument 1: cannot convert from 'method group' to 'System.Action'

我错过了什么？

Answer 1

我相信这将工作：

_projmenuItem_Edit = new RelayCommand<object>((txt)=>ProjEditNode(txt)); 

- 编辑 -

你需要定义与类型的RelayCommand还有：

例如

public RelayCommand<string> myCommand { get; private set; } 
myCommand = new RelayCommand<string>((s) => Test(s)); 

private void Test(string s) 
{ 
    throw new NotImplementedException(); 
}