wpf - 在MVVM中接收CommandParameter值

我像这样绑定(bind)我的命令:

<Button Command="{Binding NextCommand}"
    CommandParameter="Hello"
    Content="Next" />

在这里，我还绑定(bind)了它的CommandParameter属性，现在介绍如何从NextCommand获取其值。

public ICommand NextCommand
    {
        get
        {
            if (_nextCommand == null)
            {
                _nextCommand = new RelayCommand(
                    param => this.DisplayNextPageRecords()
                    //param => true
                    );
            }
            return _nextCommand;
        }
    }

其功能定义:

public ObservableCollection<PhonesViewModel> DisplayNextPageRecords()
    {

            //How to fetch CommandParameter value which is set by
            //value "Hello" at xaml. I want here "Hello"
            PageNumber++;
            CreatePhones();
            return this.AllPhones;

    }

如何获取CommandParameter值？

提前致谢。

最佳答案

更改您的方法定义:

public ObservableCollection<PhonesViewModel> DisplayNextPageRecords(object o)
{
    // the method's parameter "o" now contains "Hello"
    PageNumber++;
    CreatePhones();
    return this.AllPhones;
}

看看如何在创建RelayCommand时，其“执行” lambda接受参数？将其传递给您的方法:

_nextCommand = new RelayCommand(param => this.DisplayNextPageRecords(param));