從DataGrid中選擇DataGridCell

Question

我有一個DataGrid WPF控件，我想要獲取特定的DataGridCell。我知道行和列索引。我怎樣才能做到這一點？

我需要DataGridCell，因爲我必須有權訪問其內容。所以如果我有（例如）一列DataGridTextColum，我的內容將是一個TextBlock對象。

Answer 1

您可以使用類似下面的代碼來選擇單元格：

var dataGridCellInfo = new DataGridCellInfo(
    dataGrid.Items[rowNo], dataGrid.Columns[colNo]); 

dataGrid.SelectedCells.Clear(); 
dataGrid.SelectedCells.Add(dataGridCellInfo); 
dataGrid.CurrentCell = dataGridCellInfo; 

我看不到的方式來直接更新特定單元格的內容，所以爲了更新特定的內容電池我會做以下

// gets the data item bound to the row that contains the current cell 
// and casts to your data type. 
var item = dataGrid.CurrentItem as MyDataItem; 

if(item != null){ 
    // update the property on your item associated with column 'n' 
    item.MyProperty = "new value"; 
} 
// assuming your data item implements INotifyPropertyChanged the cell will be updated. 

Answer 2

你可以簡單地使用這個擴展方法 -

public static DataGridRow GetSelectedRow(this DataGrid grid) 
{ 
    return (DataGridRow)grid.ItemContainerGenerator.ContainerFromItem(grid.SelectedItem); 
} 

你可以通過現有的行和列id來獲取一個DataGrid的細胞：

public static DataGridCell GetCell(this DataGrid grid, DataGridRow row, int column) 
{ 
    if (row != null) 
    { 
     DataGridCellsPresenter presenter = GetVisualChild<DataGridCellsPresenter>(row); 

     if (presenter == null) 
     { 
      grid.ScrollIntoView(row, grid.Columns[column]); 
      presenter = GetVisualChild<DataGridCellsPresenter>(row); 
     } 

     DataGridCell cell = (DataGridCell)presenter.ItemContainerGenerator.ContainerFromIndex(column); 
     return cell; 
    } 
    return null; 
} 

grid.ScrollIntoView是使這項工作的情況下，數據網格是虛擬化的關鍵和所需的細胞是不是針對當前。

檢查此鏈接的詳細信息 - Get WPF DataGrid row and cell

Answer 3

這裏是我使用的代碼：

/// <summary> 
    /// Get the cell of the datagrid. 
    /// </summary> 
    /// <param name="dataGrid">The data grid in question</param> 
    /// <param name="cellInfo">The cell information for a row of that datagrid</param> 
    /// <param name="cellIndex">The row index of the cell to find. </param> 
    /// <returns>The cell or null</returns> 
    private DataGridCell TryToFindGridCell(DataGrid dataGrid, DataGridCellInfo cellInfo, int cellIndex = -1) 
    { 
     DataGridRow row; 
     DataGridCell result = null; 

     if (dataGrid != null && cellInfo != null) 
     { 
      if (cellIndex < 0) 
      { 
       row = (DataGridRow)dataGrid.ItemContainerGenerator.ContainerFromItem(cellInfo.Item); 
      } 
      else 
      { 
       row = (DataGridRow)dataGrid.ItemContainerGenerator.ContainerFromIndex(cellIndex); 
      } 

      if (row != null) 
      { 
       int columnIndex = dataGrid.Columns.IndexOf(cellInfo.Column); 

       if (columnIndex > -1) 
       { 
        DataGridCellsPresenter presenter = this.FindVisualChild<DataGridCellsPresenter>(row); 

        if (presenter != null) 
        { 
         result = presenter.ItemContainerGenerator.ContainerFromIndex(columnIndex) as DataGridCell; 
        } 
        else 
        { 
         result = null; 
        } 
       } 
      } 
     } 

     return result; 
    }` 

這是假設的DataGrid已經被加載（執行自己的加載處理程序）。