WPF dataGrid查找单个单元格的X和Y并设置背景色
||
我有一个绑定到数据网格（MVVM）的类型化数据集。我也有一个点列表（类型化数据集中的X和Y），指出哪些单元格有错误。检测到此的逻辑很复杂，并且在服务器端运行。
我的目标是在每个单元格有错误的情况下为它们涂上不同的颜色（即，点列表包含该单元格的X和Y）。
dataGrid定义为：
<DataGrid x:Name=\"gridData\" Grid.Row=\"0\" Grid.Column=\"0\" Grid.ColumnSpan=\"3\" VerticalAlignment=\"Stretch\" HorizontalAlignment=\"Stretch\"
BorderThickness=\"0 0 0 0\" Margin=\"0 0 0 0\" AutoGenerateColumns=\"True\" AlternationCount=\"1\" AlternatingRowBackground=\"AliceBlue\"
ItemsSource=\"{Binding Path=EquisDataTable}\" SelectionUnit=\"Cell\" SelectedCellsChanged=\"gridData_SelectedCellsChanged\"
AutoGeneratedColumns=\"GridData_OnAutoGeneratedColumns\" AutoGeneratingColumn=\"gridData_AutoGeneratingColumn\" Height=\"350\">
<DataGrid.CellStyle>
<Style TargetType=\"{x:Type DataGridCell}\">
<Style.Setters>
<Setter Property=\"Background\">
<Setter.Value>
<MultiBinding Converter=\"{StaticResource onErrorConverter}\">
<Binding RelativeSource=\"{RelativeSource Self}\" />
<Binding RelativeSource=\"{RelativeSource AncestorType=SampleTests:SampleTestUserControlBase}\" Path=\"DataContext.Problems\" />
<Binding RelativeSource=\"{RelativeSource FindAncestor, AncestorType={x:Type DataGrid}}\" />
</MultiBinding>
</Setter.Value>
</Setter>
</Style.Setters>
</Style>
</DataGrid.CellStyle>
</DataGrid>
private void gridData_SelectedCellsChanged(object sender, SelectedCellsChangedEventArgs e)
{
int x;
int y;
if (TryGetDataGridCellXandY(gridData.CurrentCell, gridData, out x, out y))
{ }
}
private bool TryGetDataGridCellXandY(DataGridCellInfo dgc, DataGrid dataGrid, out int x, out int y)
{
int columnIndex = dgc.Column.DisplayIndex;
return TryGetDataGridCellXandY(columnIndex, dataGrid, out x, out y);
}
private bool TryGetDataGridCellXandY(int columnIndex, DataGrid dataGrid, out int x, out int y)
{
DataGridCellInfo currentCell = dataGrid.CurrentCell;
int rowIndex = int.MinValue;
DataRowView rowView = currentCell.Item as DataRowView;
if (rowView != null)
{
DataRow dataRow = rowView.Row;
FieldInfo fi = typeof(DataRow).GetField(\"_rowID\", BindingFlags.NonPublic | BindingFlags.Instance);
try
{
if (fi != null)
{
rowIndex = System.Convert.ToInt32(fi.GetValue(dataRow));
}
}
catch (InvalidCastException) { }
}
x = columnIndex;
y = rowIndex;
return x > 0 && y > 0;
}
public class DataGridCellOnErrorConversion : IMultiValueConverter
{
private const string DefaultColour = \"White\";
private const string ErrorColour = \"Red\";
public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
{
if (values.Length != 3)
return DefaultColour;
DataGridCell dgc = values[0] as DataGridCell;
if(dgc == null)
return DefaultColour;
IList<Point> problems = values[1] as IList<Point>;
if(problems == null)
return DefaultColour;
DataGrid grid = values[2] as DataGrid;
if (grid == null)
return DefaultColour;
int x;
int y;
if (TryGetDataGridCellXandY(grid.CurrentCell, grid, out x, out y))
{
if (problems.Any(problem => System.Convert.ToInt32(problem.X) == x && System.Convert.ToInt32(problem.Y) == y))
{
return ErrorColour;
}
}
return DefaultColour;
}
private bool TryGetDataGridCellXandY(DataGridCellInfo dgc, DataGrid dataGrid, out int x, out int y)
{
int columnIndex = dgc.Column.DisplayIndex;
return TryGetDataGridCellXandY(columnIndex, dataGrid, out x, out y);
}
private bool TryGetDataGridCellXandY(int columnIndex, DataGrid dataGrid, out int x, out int y)
{
DataGridCellInfo currentCell = dataGrid.CurrentCell;
int rowIndex = int.MinValue;
DataRowView rowView = currentCell.Item as DataRowView;
if (rowView != null)
{
DataRow dataRow = rowView.Row;
FieldInfo fi = typeof(DataRow).GetField(\"_rowID\", BindingFlags.NonPublic | BindingFlags.Instance);
try
{
if (fi != null)
{
rowIndex = System.Convert.ToInt32(fi.GetValue(dataRow));
}
}
catch (InvalidCastException) { }
}
x = columnIndex;
y = rowIndex;
return x > 0 && y > 0;
}
}
没有找到相关结果
已邀请:
1 个回复
导力疵谜
<Style TargetType=\"{x:Type DataGridCell}\"> <Style.Setters> <Setter Property=\"Background\"> <Setter.Value> <MultiBinding Converter=\"{StaticResource onErrorConverter}\"> <Binding RelativeSource=\"{RelativeSource Self}\" /> <Binding RelativeSource=\"{RelativeSource AncestorType=SampleTests:SampleTestUserControlBase}\" Path=\"DataContext.Problems\" /> <Binding RelativeSource=\"{RelativeSource FindAncestor, AncestorType={x:Type DataGrid}}\" /> </MultiBinding> </Setter.Value> </Setter> </Style.Setters> </Style>public class DataGridCellOnErrorConversion : IMultiValueConverter { private readonly SolidColorBrush DefaultColour = new SolidColorBrush(Colors.White); private readonly SolidColorBrush ErrorColour = new SolidColorBrush(Colors.Red); private readonly SolidColorBrush AlternatingColour = new SolidColorBrush(Colors.AliceBlue); public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture) { if (values.Length < 3) return DefaultColour; DataGridCell dgc = values[0] as DataGridCell; if(dgc == null) return DefaultColour; IList<Point> problems = values[1] as IList<Point>; if(problems == null) return DefaultColour; DataGrid grid = values[2] as DataGrid; if (grid == null) return DefaultColour; int x; int y = -1; ItemCollection itemCollection = grid.Items; for (int i = 0; i < itemCollection.Count; i++) { if (itemCollection.CurrentItem == itemCollection[i]) y = i; } x = dgc.Column.DisplayIndex; DataRowView currentRowView = null; FieldInfo fi = dgc.GetType().GetField(\"_owner\", BindingFlags.NonPublic | BindingFlags.Instance); try { if (fi != null) { DataGridRow dataGridRow = fi.GetValue(dgc) as DataGridRow; if(dataGridRow != null) currentRowView = dataGridRow.Item as DataRowView; } } catch (InvalidCastException) { } if(currentRowView != null) { for (int i = 0; i < itemCollection.Count; i++) { if (currentRowView == itemCollection[i]) y = i; } } if (problems.Any(problem => System.Convert.ToInt32(problem.X) == x && System.Convert.ToInt32(problem.Y) == y)) { return ErrorColour; } return y % 2 == 0 ? AlternatingColour : DefaultColour; } }