我尝试像这样获取行：
DataGridRow row = (DataGridRow)dataGrid.ItemContainerGenerator.ContainerFromIndex(i);
TextBlock cellContent = dataGrid.Columns[0].GetCellContent(row) as TextBlock;
但是我只得到了null。还有其他解决方案吗？我做错了什么吗？
我想从我的单元格中获取数据。我的单元格是复选框。
var currentItem = myDataGrid.SelectedItem as MyObject;
DataGridRow mRow = new DataGridRow();
mRow.Item = YOUR_DATA_CLASS;
_ = datagrid.Items.Add(mRow);
DataGrid 接受适当的数据对象以进行操作：由于 DataGrid 的工作原理是绑定到数据对象，因此您需要将数据保存在类似于 DataTable 的东西中。
例如，为您的 MainWindow 类初始化一个类型为 DataTable 的字段，并给它命名一个相关的名称：
public partial class MainWindow : Window
{
private DataTable _cars = new DataTable("Cars");
然后在你的构造函数中，在初始化窗口组件之后，将 DataGrid.ItemSource 绑定到 DataTable 的集合作为数据视图：
public MainWindow()
{
InitializeComponent();
dgCars.ItemsSource = _cars.AsDataView();
}
_cars 表添加新行，它们都将反映在 DataGrid 中，耶！然而，您希望能够从用户界面操作数据，所以让我们深入探讨一下！
DataTable 中的数据：当您想要操作数据时，您可以获取从 DataGrid 内部选择的项目，并使用它们提供的索引从 DataTable 中删除项目，然后重新应用 DataView。这是摘要，但我会详细介绍并完成示例：
We need to iterate over each DataGrid item and check if it is selected before performing our logic:
for (int i = 0; i < dgCars.Items.Count; i++)
{
if (dgCars.SelectedItems.Contains(dgCars.Items[i]))
{
// This is where we do the magic
}
}
HOWEVER, we can't remove items from the DataTable that is currently being used to supply the DataGrid or we'll run into IndexOutOfBounds (and possibly Enumeration) errors, so to be safe, we'll use a copy of the table to operate on:
DataTable result = _cars.Copy(); //New in this step
for (int i = 0; i < dgCars.Items.Count; i++)
{
if (dgCars.SelectedItems.Contains(dgCars.Items[i]))
{
result.Rows.RemoveAt(i); //New in this step
}
}
Again, we'll run into IndexOutOfBounds errors, because we are iteration over the data as if there was X amount of data, but each time we RemoveAt(i), we're now iterating over X-- amount of data. So, let's add a count and keep track:
int removed = 0; //New in this step
DataTable result = _cars.Copy();
for (int i = 0; i < dgCars.Items.Count; i++)
{
if (dgCars.SelectedItems.Contains(dgCars.Items[i]))
{
//Subtracting `removed` new in this step
result.Rows.RemoveAt(i - removed);
removed++; //New in this step
}
}
Last, but not least, we'll point our _cars variable to our result DataTable object on the heap and then reassign the dgCars.ItemSource = _cars.AsDataView() to update our DataGrid (a more complicated explanation on this at the very bottom of my answer, if interested):
int removed = 0;
DataTable result = _cars.Copy();
for (int i = 0; i < dgCars.Items.Count; i++)
{
if (dgCars.SelectedItems.Contains(dgCars.Items[i]))
{
result.Rows.RemoveAt(i - removed);
removed++;
}
}
_cars = result; //New in this step
dgCars.ItemSource = _cars.AsDataView(); //New in this step
DataGrid中删除数据，该按钮的Click值等于btnRemove_Click。简单的修改和逻辑更改将允许您执行相同的操作以添加、编辑等数据，但使用我们最初开始的原则，即操作数据对象（在本例中为DataTable）并使该项成为DataGrid的ItemsSource。public partial class MainWindow : Window
{
private DataTable _cars = new DataTable("Cars");
public MainWindow()
{
InitializeComponent();
// THIS WASN'T IN THE BUILD EXAMPLE, BUT AS A BONUS:
// We could ALSO use this opportunity to setup static
// column headers if we know what they are in advance!
_cars.Columns.Add("Year");
_cars.Columns.Add("Make");
_cars.Columns.Add("Model");
dgCars.ItemsSource = _cars.AsDataView();
}
private btnRemove_Click(object sender, RoutedEventArgs e)
{
int removed = 0;
DataTable result = _cars.Copy();
for (int i = 0; i < dgCars.Items.Count; i++)
{
if (dgCars.SelectedItems.Contains(dgCars.Items[i]))
{
result.Rows.RemoveAt(i - removed);
removed++;
}
}
_cars = result;
dgCars.ItemSource = _cars.AsDataView();
}
}
在第四步中，我提到：
最后，我们将把
_cars变量指向堆上的resultDataTable 对象，然后重新分配dgCars.ItemSource = _cars.AsDataView()来更新我们的 DataGrid。
这样做的原因是因为 _cars 和 result 都是从一个类实例化出来的对象，所以它们位于堆上。堆上的项在堆栈上不再有引用时会被垃圾回收（从内存中删除）。由于 _cars 是我们的 MainWindow 的字段，并且继续超出了 btnRemove_Click 的范围，当我们将其指向 DataTable result 时，我们保留了对该表的引用，并且放弃了对原始表的引用。因此，当 btnRemove_Click 完成时，变量 result 被垃圾回收，原来 _cars 指向的旧的 DataTable 被垃圾回收，而 _cars 现在引用我们创建的新 DataTable 对象。
for(int row =0; row < dg_CountInventory.Rows.Count; row ++) //Loop through each row
{
//Provide the Column Index and row as in Loop
TextBlock b = dg_CountInventory.Columns[1].GetCellContent(dg_CountInventory.Items[row ]) as TextBlock;
}
dg_CountInventory是我的网格名称。此代码将循环遍历数据网格中提供的所有记录和单元格/列。
DataGrid没有Rows属性。 - O. R. Mapper