WPF 之MVVM实例

一、安装

1、nuget搜索“mvvmlight”安装

安装完成安装了如下3个相关插件

mvvmlights和commonservicelocator是自动关联安装的

2、安装时版本不要选最新，否则后期会提示找不到相关引用

如下图，安装4.X版本

3、安装完成后，项目目录下自动生成viewmodel文件夹和viewmodellocator类

viewmodellocator作用在于统一建立所有xaml页面、xaml.cs与viewmodel之间的关系，实现数据/实体的双向绑定，并实例化viewmodel

二、tabcontrol数据绑定实例

1、新增基类ViewModelBase，继承ViewModelBase，封装数据传递实体

using GalaSoft.MvvmLight;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace IIViewUI.ViewModel
{
    public class ViewModelBase : ViewModelBase
    {
        /// 

        ///     数据列表
        /// 
        private IList _dataList;

        /// 

        ///     数据列表
        /// 
        public IList DataList
        {
            get => _dataList;
#if netle40
            set => Set(nameof(DataList), ref _dataList, value);
#else
            set => Set(ref _dataList, value);
#endif       
        }
    }
}

2、新增PIndex page页面

（1）上图标注1与"viewmodel"对应viewmodellocator,其中“PIView”一定要与viewmodellocator中实例化的名称

（2）上图标注2，对应viewmodel对应的实例化的实体名称

（3）上图标注3，对应实体类的属性

3、新增实体类TabControlModel

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DTO
{
    public class TabControlModel
    {
        public string Header { get; set; }

        public string Url { get; set; }
    }
}

4、新增PIndexViewModel继承ViewModelBase

在构造函数中获取数据并封装进DataList

using DTO;
using GalaSoft.MvvmLight;
using GalaSoft.MvvmLight.Command;
using HandyControl.Controls;
using HandyControl.Data;
using IIViewUI.Pages;
using IIViewUI.ViewModel;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;

namespace ViewModel
{
    public class PIndexViewModel : ViewModelBase
    {
        public PIndexViewModel()
        {
            DataList = GetTabControlDemoDataList();
            AddTabItemCommand = new RelayCommand(AddTabItem);
        }

        public RelayCommand AddTabItemCommand { get; set; }

        
        private void AddTabItem()
        {
            //CreatNewTab("百度一下", "IIViewUI.Pages.PToBeInterviewed");
        }

        internal ObservableCollection GetTabControlDemoDataList()
        {
            return new ObservableCollection
            {
                new TabControlModel
                {
                    Header = "Success",
                    Url = "IIViewUI.Pages.PToBeInterviewed"
                },
                new TabControlModel
                {
                    Header = "Primary",
                    Url = "IIViewUI.Pages.PToBeInterviewed"
                },
                new TabControlModel
                {
                    Header = "Warning",
                    Url = "IIViewUI.Pages.PToBeInterviewed"
                },
                new TabControlModel
                {
                    Header = "Danger",
                    Url = "IIViewUI.Pages.PToBeInterviewed"
                },
                new TabControlModel
                {
                    Header = "Info",
                    Url = "IIViewUI.Pages.PToBeInterviewed"
                }
            };
        }
    }
}