基于前一行设置DataGrid背景颜色

Question

我想设置一个网格，我在那里做列排序，但我想做斑马条纹，而不是每隔一行或每x行，我想它基于前一行的值。即包含0的所有行都有一个蓝色的背景，下一个值将有一个白色的背景，下一个值将是蓝色等...

我的问题是，我似乎无法找到在哪里实际上做背景颜色的设置。我使用的是自定义分类器，在重新排列列表并设置数据源之后，我尝试将它设置在那里，但似乎在设置数据源时，这些行还不存在。我尝试使用DataContextChanged，但该事件似乎并没有被解雇。

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; 
    } 
    } 
} 
    } 
    } 
} 

Answer 1

添加处理程序LoadingRow，把你的颜色逻辑有：

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; 
    } 
} 

然后你就可以在分拣isColorOne和previousValue必要时重新设定值。