[英]WPF: Change DataGrid cell/row background color dynamically at runtime
我有多個綁定到DataTable的DataGrid,這些DataTable是使用SQL動態創建的。 每當DataTable記錄更改(添加,修改,刪除)時,DataGridCell都應相應地更改其背景顏色(綠色=新,黃色=修改等)。
在WinForms中,我使用_RowPostPaint更改了DataGridView的背景顏色(代碼非常簡化):
private void DataGridViewTest_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e)
{
DataRow row = (this.Rows[e.RowIndex].DataBoundItem as DataRowView).Row;
switch (row.RowState)
{
case DataRowState.Added:
myBitmap = new Bitmap(imageList.Images[1]);
this[0, e.RowIndex].Style.BackColor = CellChangesColorAdded;
break;
case DataRowState.Modified:
string sValOld = row[0, DataRowVersion.Original].ToString();
string sValNew = row[0].ToString();
if (sValOld != sValNew)
{
this[0, e.RowIndex].Style.BackColor = CellChangesColorMod;
}
break;
case DataRowState.Deleted:
this[0, e.RowIndex].Style.BackColor = CellChangesColorDel;
break;
}
}
我不想像在無數這樣的示例中那樣對XAML中的列依賴關系進行硬編碼,因為它們是在運行時創建的,並且我使用了許多DataGrid。
嘗試使用DataGrid_CellEditEnding失敗,因為它不保留排序等更改。
XAML:
<Window.Resources>
<Style x:Key="MyStyle" TargetType="{x:Type DataGridCell}">
<Setter Property="Background" Value="Green" />
</Style>
</Window.Resources>
<DataGrid x:Name="dataGrid" Grid.Row="4" Grid.ColumnSpan="6"
ItemsSource="{Binding}"
>
</DataGrid>
的.cs:
dataGrid.DataContext = dataTable.DefaultView; // Table filled by SQL query
dataGrid.CellEditEnding += dataGrid_CellEditEnding;
// Problem: Color changes disappear when user sorts DataGrid
private void dataGrid_CellEditEnding(object sender, DataGridCellEditEndingEventArgs e)
{
if (e.EditAction == DataGridEditAction.Commit)
{
TextBox tb = e.EditingElement as TextBox;
DataGridCell cell = tb.Parent as DataGridCell;
// evaluate row changes and change color accordingly
//cell.Background = new SolidColorBrush(Colors.Yellow); // set style instead of color
cell.Style = (Style)this.Resources["MyStyle"]; // color is changed to green, according to defined style
}
}
這樣可以很好地更改背景顏色,但是在對DataGrid等進行排序時不會保留樣式。
如何確保保持顏色變化? 我認為,最好的解決方案是以某種方式將DataRows綁定到助手類,並在DataTable更改后返回各自的樣式。 但是我還沒有看到任何例子。
為了完整性:
如果您確實打算在運行時更改顏色,則可以忽略MVVM,例如使用DataGrid_LoadingRow,檢查它的DataContext(在本例中為DataRowView),然后從那里繼續:
// Changes beeing made to the entire row in this case
private void DgModules_LoadingRow(object sender, DataGridRowEventArgs e)
{
DataGridRow gridRow = e.Row;
DataRow row = (gridRow.DataContext as DataRowView).Row;
switch (row.RowState)
{
case DataRowState.Added:
gridRow.Background = new SolidColorBrush(Colors.Green);
break;
case DataRowState.Modified:
gridRow.Background = new SolidColorBrush(Colors.Yellow);
break;
case DataRowState.Deleted:
gridRow.Background = new SolidColorBrush(Colors.Red);
break;
}
}
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.