Wpf DataGrid动态添加列，行数据（二）

这是第二中方法，可直接绑定，我这里只是做出了一种思路，并不是最完美。

这里注意一下，因为我里面引用了MVVMLight，所以可能代码不是复制过去就能用了的。

样式也是，所以复制过去看不是我贴出来的界面这也不奇怪。代码：

 <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*"/>

        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition Height="auto"></RowDefinition>

            <RowDefinition Height="*"></RowDefinition>
        </Grid.RowDefinitions>
        <StackPanel Orientation="Horizontal">
            <Button Content="新增列" Command="{Binding AddColumnCmd}" Margin="5"/>
            <Button Content="删除列" Command="{Binding DeleteColumnCmd}" Margin="5"/>
            <Button Content="新增数据" Command="{Binding AddDataCmd}" Margin="5"/>
        </StackPanel>
        <!-- 自定义的DataGrid，使用到了一个依赖属性DataSource -->
        <Controls:DyDataGrid HeadersVisibility="All" RowHeaderWidth="60" Grid.Row="1" MinColumnWidth="10"  DataSource="{Binding DyDGrid,Source={StaticResource Locator}}" SelectionUnit="CellOrRowHeader" SelectionMode="Extended"/>

    </Grid>

自定义控件DyDataGrid，就添加一个依赖属性，赋值一个VM类DyDataGridViewModel，把DyDataGrid赋值给DyDataGridViewModel的DataGrid

public class DyDataGrid : DataGrid
    {
        public DyDataGrid()
            : base()
        {
            AutoGenerateColumns = false;
            CanUserAddRows = false;

            CanUserSortColumns = false;
        }

        // 这个控件的一个自定义属性;
        private DyDataGridViewModel mDataSource;
        public DyDataGridViewModel DataSource
        {
            get { return mDataSource; }
            set
            {
                mDataSource = value;
            }
        }

        /// <summary>
        /// 定义了一个名为DataSourc的控件依赖属性;
        /// 这个依赖属性用于显示peopoleDataGrid的内容;
        /// </summary>
        public static readonly DependencyProperty DataSourceProperty =
                DependencyProperty.Register("DataSource", typeof(DyDataGridViewModel), typeof(DyDataGrid),
                new FrameworkPropertyMetadata(new PropertyChangedCallback(OnDataSourcePeopertyChanged)));

        private static void OnDataSourcePeopertyChanged(DependencyObject obj, DependencyPropertyChangedEventArgs args)
        {
            DyDataGrid dyDataGrid = (DyDataGrid)obj;

            if (args.NewValue is DyDataGridViewModel)
            {
                if (dyDataGrid != null)
                {
                    DyDataGridViewModel peoplesViewModel = args.NewValue as DyDataGridViewModel;
                    peoplesViewModel.DDataGrid = dyDataGrid;

                }
            }

        }

/// <summary>
    /// DyDataGrid的数据源，自动新增列等功能
    /// </summary>
    public class DyDataGridViewModel : ViewModelBase
    {
        /// <summary>
        /// 绑定的数据
        /// </summary>
        ObservableCollection<ExpandoObject> _Items = new ObservableCollection<ExpandoObject>();

        private DataGrid _DDataGrid;
        public DataGrid DDataGrid
        {
            get
            {
                return _DDataGrid;
            }
            set
            {
                if (_DDataGrid != null)
                {
                    _DDataGrid.ItemsSource = null;
                }
                _DDataGrid = value;
                Init();
            }
        }

        public ObservableCollection<ExpandoObject> Items
        {
            get { return _Items; }
            set
            {
                _Items = value;
                RaisePropertyChanged(() => Items);
            }
        }

        #region 方法
        /// <summary>
        /// 初始化
        /// </summary>
        public void Init()
        {
            Items.Clear();

            for (int i = 0; i < 5; i++)
            {
                dynamic item = new ExpandoObject();
                item.A = "Property A value - " + i.ToString();
                item.B = "Property B value - " + i.ToString();
                _Items.Add(item);
            }

            DDataGrid.Columns.Add(new DataGridTextColumn() { Header = "A", Binding = new Binding("A") });
            DDataGrid.Columns.Add(new DataGridTextColumn() { Header = "B", Binding = new Binding("B") });

            _DDataGrid.ItemsSource = Items;
        }

        public void AddData()
        {
            //dynamic item = new ExpandoObject();
            //item.A = "New Item - A";
            //item.B = "New Item - B";
            //item.NewColumn1 = "New Item - C";
            //Items.Add(item);
        }

        /// <summary>
        /// 添加列和列数据
        /// </summary>
        /// <param name="columnName">列名</param>
        /// <param name="columnName">显示列名</param>
        /// <param name="vs">填充的列数据</param>
        public void AddColumn(string columnName, string Header, List<string> vs)
        {
            int i = 0;
            int count = vs.Count;
            //循环获取行数据
            foreach (IDictionary<String, Object> item in Items)
            {
                //每行添加新列数据
                item.Add(columnName, vs[i]);
                i++;
                //添加完数据跳出
                if (i >= vs.Count) break;
            }

            //如果列数据多，则继续添加
            for (; i < vs.Count; i++)
            {
                //可以这么用 columnName就是传进来的列名
                dynamic item = new ExpandoObject();
                item.columnName = vs[i];

                Items.Add(item);
            }

            //添加列
            DDataGrid.Columns.Add(new DataGridTextColumn()
            {
                Header = Header,
                Binding = new Binding(columnName)
            });

        }
        /// <summary>
        /// 删除选中列
        /// </summary>
        public void DeleteColumn()
        {
            for (int i = 0; i < DDataGrid.SelectedCells.Count; i++)
            {
                //DataRowView Row = (DataRowView)DDataGrid.SelectedCells[i].Item;
                //string result = Row[DDataGrid.SelectedCells[i].Column.DisplayIndex].ToString();

                //string result = DDataGrid.SelectedCells[i].Column.DisplayIndex.ToString();

                DDataGrid.Columns.Remove(DDataGrid.SelectedCells[i].Column);
            }
        }

        #endregion
    }

public class W1ViewModel : ViewModelBase
    {
        /// <summary>
        /// Initializes a new instance of the MainViewModel class.  DataGrid
        /// </summary>
        public W1ViewModel(DyDataGridViewModel dyDataGridViewModel)
        {
            DyDGrid = dyDataGridViewModel;
        }

        public DyDataGridViewModel DyDGrid;

        public RelayCommand AddColumnCmd => new Lazy<RelayCommand>(() =>
           new RelayCommand(AddColumn)).Value;
        public RelayCommand AddDataCmd => new Lazy<RelayCommand>(() =>
            new RelayCommand(AddData)).Value;
        public RelayCommand DeleteColumnCmd => new Lazy<RelayCommand>(() =>
            new RelayCommand(DeleteColumn)).Value;

        private void AddData()
        {
            DyDGrid.AddData();
        }
        int newColumnIndex = 1;
        private void AddColumn()
        {
            string cName = "C" + newColumnIndex;
            List<string> vs = new List<string>();
            for (int i = 0; i < newColumnIndex; i++)
            {
                vs.Add("New Item - D" + i);
            }
            DyDGrid.AddColumn(cName, cName + "Show", vs);
            newColumnIndex++;
        }

        private void DeleteColumn()
        {
            DyDGrid.DeleteColumn();
        }
    }

DyDataGridViewModel封装了对DataGrid的操作，同时也是DataGrid的数据源，可以使用绑定更新

效果如下：

链接: https://pan.baidu.com/s/1eDRHMUzvpQyTjnmqoscpKw 提取码: txs6

想了想，还是把整个代码发上来，哈哈，感觉你们应该喜欢。

原文地址：https://www.cnblogs.com/lsgsanxiao/p/11559445.html