如何使用 MVVM 模式在 WPF 数据网格中绑定 CurrentCell
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How to Bind CurrentCell in WPF datagrid using MVVM pattern
提问by Bharath T
I'm learning WPF MVVM pattern. I'm stuck in Binding CurrentCellof datagrid. Basically I need the row index and column index of current cell.
我正在学习 WPF MVVM 模式。我被困在Binding CurrentCell了datagrid。基本上我需要当前单元格的行索引和列索引。
<DataGrid AutoGenerateColumns="True"
SelectionUnit="Cell"
CanUserDeleteRows="True"
ItemsSource="{Binding Results}"
CurrentCell="{Binding CellInfo}"
Height="282"
HorizontalAlignment="Left"
Margin="12,88,0,0"
Name="dataGrid1"
VerticalAlignment="Top"
Width="558"
SelectionMode="Single">
Here is my ViewModel
这是我的 ViewModel
private User procedureName = new User();
public DataGridCell CellInfo
{
get { return procedureName.CellInfo; }
//set
//{
// procedureName.CellInfo = value;
// OnPropertyChanged("CellInfo");
//}
}
Here is my Model
这是我的模型
private DataGridCell cellInfo;
public DataGridCell CellInfo
{
get { return cellInfo; }
//set
//{
// cellInfo = value;
// OnPropertyChanged("CellInfo");
//}
}
And in my ViewModel CellInfois always null. I am not able to get the value from the currentcellin datagrid. Please let me know a way to getCurrentCellin the ViewModel.
在我的 ViewModelCellInfo中总是null. 我无法从currentcellin 中获取值datagrid。请让我知道CurrentCell进入 ViewModel 的方法。
if (CellInfo != null)
{
MessageBox.Show("Value is" + CellInfo.Column.DisplayIndex.ToString());
}
回答by kosdos
After having a quick poke-around I've noticed a very simple solution to your problem.
在快速浏览之后，我注意到您的问题有一个非常简单的解决方案。
First of all there's two problems rather then one here. You cannot bind a CellInfoof a type DataGridCell, it needs to be DataGridCellInfoas xaml cannot convert it on its own.
首先，这里有两个问题，而不是一个。你不能绑定 aCellInfo类型 DataGridCell，它需要是DataGridCellInfo因为 xaml 不能自己转换它。
Secondly in your xaml you will need to add Mode=OneWayToSourceor Mode=TwoWayto your CellInfobinding.
其次，在您的 xaml 中，您需要将Mode=OneWayToSource或添加Mode=TwoWay到您的CellInfo绑定中。
Here is a rough example semi-related to your original code
这是一个与您的原始代码半相关的粗略示例
XAML
XAML
<DataGrid AutoGenerateColumns="True"
SelectionUnit="Cell"
SelectionMode="Single"
Height="250" Width="525"
ItemsSource="{Binding Results}"
CurrentCell="{Binding CellInfo, Mode=OneWayToSource}"/>
VM
虚拟机
private DataGridCellInfo _cellInfo;
public DataGridCellInfo CellInfo
{
get { return _cellInfo; }
set
{
_cellInfo = value;
OnPropertyChanged("CellInfo");
MessageBox.Show(string.Format("Column: {0}",
_cellInfo.Column.DisplayIndex != null ? _cellInfo.Column.DisplayIndex.ToString() : "Index out of range!"));
}
}
Just a small tip - if you debug your app and look at the Output window it actually tells you if there is any troubles with your bindings.
只是一个小技巧 - 如果您调试应用程序并查看“输出”窗口，它实际上会告诉您绑定是否存在任何问题。
Hope this helps!
希望这可以帮助！
K.
K。
