必须在silverlight的DataGrid
元素中进行验证:如果在组合框中选择了特定值,则必须禁用同一行(DataGridCheckBoxColumn
)上的复选框列。但是,从我看到的情况来看,我只能禁用整个列,这是不可接受的。
那么,如果我有其坐标(行,列),如何禁用特定单元格?
P.S。类似的问题 - here不适合我。 silverlight 4中有没有CellEnter和CellLeave事件。
答案 0 :(得分:2)
答案的一部分可能是:
private void DisableCheckboxColumnInRow(DataGridRow row)
{
var checkBoxColumn = Datagrid1.Columns[0];
var checkBoxCell = GetCell(checkBoxColumn, row);
checkBoxCell.IsEnabled = false;
}
private static DataGridCell GetCell(DataGridColumn column, DataGridRow row)
{
var cellContent = column.GetCellContent(row);
return (DataGridCell)cellContent.Parent;
}
但是使用MVVM可能有更好的方法:
ViewModel部分:
public class TestItem : INotifyPropertyChanged
{
private bool _isChecked;
public bool IsChecked
{
get { return _isChecked; }
set
{
_isChecked = value;
OnPropertyChanged("IsChecked");
}
}
private bool _canBeChecked;
public bool CanBeChecked
{
get { return _canBeChecked; }
private set
{
_canBeChecked = value;
OnPropertyChanged("CanBeChecked");
}
}
private string _selectedValue;
public string SelectedValue
{
get { return _selectedValue; }
set
{
_selectedValue = value;
OnPropertyChanged("SelectedValue");
// here we do the 'magic':
CanBeChecked = SelectedValue != "one";
}
}
public IEnumerable<string> PossibleValues
{
get
{
yield return "one";
yield return "two";
yield return "free";
}
}
#region Implementation of INotifyPropertyChanged
public event PropertyChangedEventHandler PropertyChanged;
private void OnPropertyChanged(string propertyName)
{
var handler = PropertyChanged;
if (handler != null)
handler(this, new PropertyChangedEventArgs(propertyName));
}
#endregion
}
查看部分:
<Controls:DataGridTemplateColumn>
<Controls:DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<ComboBox ItemsSource="{Binding PossibleValues}" SelectedItem="{Binding SelectedValue,Mode=TwoWay}" />
</DataTemplate>
</Controls:DataGridTemplateColumn.CellTemplate>
</Controls:DataGridTemplateColumn>
<Controls:DataGridTemplateColumn>
<Controls:DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<CheckBox IsChecked="{Binding IsChecked,Mode=TwoWay}" IsEnabled="{Binding CanBeChecked}" />
</DataTemplate>
</Controls:DataGridTemplateColumn.CellTemplate>
</Controls:DataGridTemplateColumn>