在运行时更改Datagrid wpf中行的背景色

<DataGrid x:Name="datagrid" AutoGenerateColumns="False">
    <!-- Define columns here -->
</DataGrid>

Dictionary<string, Brush> rowBackgroundColors = new Dictionary<string, Brush>();
Dictionary<int, Brush> rowIndexBackgroundColors = new Dictionary<int, Brush>();

datagrid.Loaded += (sender, e) =>
{
    foreach (var item in datagrid.Items)
    {
        var row = datagrid.ItemContainerGenerator.ContainerFromItem(item) as DataGridRow;
        row.MouseEnter += (s, ev) =>
        {
            if (!rowIndexBackgroundColors.ContainsKey(row.GetIndex()))
            {
                rowIndexBackgroundColors.Add(row.GetIndex(), row.Background);
            }
            row.Background = Brushes.LightGray; // 设置悬停时的背景色
        };
        row.MouseLeave += (s, ev) =>
        {
            if (rowIndexBackgroundColors.ContainsKey(row.GetIndex()))
            {
                row.Background = rowIndexBackgroundColors[row.GetIndex()];
            }
        };
    }
};

datagrid.LoadingRow += (sender, e) =>
{
    var item = e.Row.Item; // 获取当前行的数据项
    var rowIdentifier = item.ToString(); // 根据数据项生成唯一标识，可以根据实际情况修改
    if (rowBackgroundColors.ContainsKey(rowIdentifier))
    {
        e.Row.Background = rowBackgroundColors[rowIdentifier];
    }
};