MVVM光RelayCommand参数 [英] MVVM Light RelayCommand Parameters

问题描述

我在与传递一个参数使用GalaSoft MVVM光框架relaycommand的问题。我知道MVVM光的实现relaycommand的不使用拉姆达的参数，所以我做了一些研究，发现了一种方法周围的人，它的工作做这样的事情：

I'm having an issue with passing a parameter to a relaycommand using the GalaSoft MVVM Light framework. I know that mvvm light's implementation of relaycommand doesn't use lambda parameters, so I did some research and found a way that people worked around it by doing something like this:

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，我一直就行了 _projmenuItem_Edit =新RelayCommand（ProjEditNode）得到一个错误; ，上面写着参数1：不能从转换'的方法组到System.Action

我在想什么？

推荐答案

我相信这将工作：

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

- 编辑 -

-- EDIT --

您需要定义与该类型的RelayCommand还有：

You'll need to define your RelayCommand with the type as well:

例如。

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

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

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