基于前一行设置DataGrid背景颜色

本文关键字:背景 颜色 DataGrid 设置 于前一 | 更新日期: 2023-09-27 18:29:42

我试图设置一个网格来进行列排序,但我想进行斑马线,只是我希望它基于前一行的值,而不是每隔一行或每x行。即,所有包含0的行都有蓝色背景,下一个值将有白色背景,下个值将是蓝色,等等…

我遇到的问题是,我似乎找不到真正在哪里设置背景色。我使用的是自定义排序器,在重新排序列表并设置数据源后,我尝试在其中设置它,但当设置数据源时,行似乎还不存在。我尝试使用DataContextChanged,但该事件似乎没有启动。

这是我现在拥有的。

namespace Foo.Bar
{
  public partial class FooBar
  {
    List<Bla> ResultList { get; set; }
    SolidColorBrush stripeOneColor = new SolidColorBrush(Colors.Gold);
    SolidColorBrush stripeTwoColor = new SolidColorBrush(Colors.White);
    //*********************************************************************************************
    public Consistency()
    {
      InitializeComponent();
    }
    //*********************************************************************************************
    override protected void PopulateTabWithData()
    {
      ResultList = GetBlas();
      SortAndGroup("Source");
    }
    //*********************************************************************************************
    private void SortAndGroup(string colName)
    {
      IOrderedEnumerable <Bla> ordered = null;
      switch (colName)
      {
        case "Source":
        case "ID":
          ordered = ResultList.OrderBy(r => r.Source).ThenBy(r => r.ID);
          break;
        case "Name":
          ordered = ResultList.OrderBy(r => r.Source).ThenBy(r => r.Name);
          break;
        case "Message":
          ordered = ResultList.OrderBy(r => r.Message);
          break;
        default:
          throw new Exception(colName);
      }
      ResultList = ordered.ThenBy(r => r.Source).ThenBy(r => r.ID).ToList(); // tie-breakers
      consistencyDataGrid.ItemsSource = null;
      consistencyDataGrid.ItemsSource = ResultList;
      ColorRows();
    }
    //*********************************************************************************************
    private void consistencyDataGrid_Sorting(object sender, System.Windows.Controls.DataGridSortingEventArgs e)
    {
      SortAndGroup(e.Column.Header.ToString());
      e.Handled = true;
    }
    private void ColorRows()
{
  for (var i = 0; i < ResultList.Count; i++)
  {
    var currentItem = ResultList[i];
    var row = myDataGrid.ItemContainerGenerator.ContainerFromItem(currentItem) as DataGridRow;
    if (row == null)
    {
      continue;
    }
    if (i > 0)
    {
      var previousItem = ResultList[i - 1];
      var previousRow = myDataGrid.ItemContainerGenerator.ContainerFromItem(previousItem) as DataGridRow;
      if (currentItem.Source == previousItem.Source)
      {
        row.Background = previousRow.Background;
      }
      else
      {
        if (previousRow.Background == stripeOneColor)
        {
          row.Background = stripeTwoColor;
        }
        else
        {
          row.Background = stripeOneColor;
        }
      }
    }
    else
    {
      row.Background = stripeOneColor;
    }
  }
}
    }
  }
}

基于前一行设置DataGrid背景颜色

为LoadingRow添加一个处理程序,并将您的颜色逻辑放在那里:

bool isColorOne = false;
var previousValue = null;
private consistencyDataGrid_LoadingRow(object sender, DataGridRowEventArgs e)
{
    // Check current value against previous value
    if (previousValue == e...)
    {
        previousValue = e...;
        isColorOne = !isColorOne;
    }
    if (isColorOne)
    {
        row.Background = stripeOneColor;
    }
    else
    {
        row.Background = stripeTwoColor;
    }
}

然后,您可以在排序时根据需要重置isColorOnepreviousValue的值。