C#WPFDataGrid標題樣式在單擊事件處理后未更新

我有一個 C# WPF 專案，使用 aDataGrid來顯示DataTable. 通過讀取 CSV 檔案（標題數量未知）并使用 CSVHelper nuget 包填充它來填充 DataTable。

using (FileStream? stream = fileInfo.OpenRead())
{ 
    using (StreamReader? reader = new(stream))
    using (CsvReader? csv = new(reader, csvConfiguration))
    {
        using CsvDataReader? dr = new(csv);
        dataTable.Load(dr);
    }
}

我正在使用以下 XAML 設定顯示此 DataTable。

<DataGrid x:Name="DataGrid"
            ItemsSource="{Binding Data, UpdateSourceTrigger=PropertyChanged}"
            HorizontalScrollBarVisibility="Visible" 
            VerticalScrollBarVisibility="Visible"
            AlternatingRowBackground="AliceBlue"
            AlternationCount="2"
            CanUserSortColumns="False"
            AutoGeneratingColumn="Data_AutoGeneratingColumn"
            IsReadOnly="True"
            CanUserReorderColumns="False"
            Loaded="Data_Loaded"
          >

    <DataGrid.ColumnHeaderStyle>
        <Style BasedOn="{StaticResource {x:Type DataGridColumnHeader}}" TargetType="DataGridColumnHeader">
            <EventSetter Event="Click" Handler="DataGridColumnHeader_Click"/>
        </Style>
    </DataGrid.ColumnHeaderStyle>
</DataGrid>

我已經為Loaded Event 添加了代碼，用于DataGrid回圈遍歷所有DataGridColumn條目，DataGrid.Columns并將HeaderStyle根據它們是否存在于 aList<string>中來設定它們：

1. 選定的標題樣式
2. UnSelectedHeaderStyle

foreach (DataGridColumn column in grid.Columns)
{
    string headerText = column.Header.ToString();
    if (cSVConfigureContext.SelectedColumns.Contains(headerText))
    {
        column.HeaderStyle = selectedHeaderStyle;
    }
    else
    {
        column.HeaderStyle = notSelectedHeaderStyle;
    }
}

我還在處理TargetType的ClickDataGridColumnHeader事件，它將HeaderStyle在 1 和 2 之間切換。

private void DataGridColumnHeader_Click(object sender, RoutedEventArgs e)
{
    var columnHeader = sender as DataGridColumnHeader;
    if (columnHeader != null)
    {
        string headerText = columnHeader.Content.ToString();
        if (cSVConfigureContext.SelectedColumns.Contains(headerText))
        {
           columnHeader.Style = notSelectedHeaderStyle;

           cSVConfigureContext.SelectedColumns.Remove(headerText);
        }
        else
        {
            columnHeader.Style = selectedHeaderStyle;
            cSVConfigureContext.SelectedColumns.Add(headerText);
        }
    }
    e.Handled = true;
}

This part all seems to work. However, adding a "Reset Headers" button to return to a default set of selected columns, is where things are not working.

If I load the window with the DataGrid and press the Reset button (which runs the same code used in the Loaded event, it works fine. But if I first click on any header to switch its state, the style on the column header does not change. I see the change in the SelectedColumns list of strings but no visual update in the DataGrid until I close that window and re-open a new DataGrid. But I can still click headers to change their state.

I've spent a couple hours googling options for forcing a redraw of the column headers but so far no luck.

任何想法為什么重置按鈕在Click事件后不起作用？

uj5u.com熱心網友回復：

任何想法為什么重置按鈕在 Click 事件后不起作用？

的顯然覆寫或優先于Style的。DataGridColumnHeaderHeaderStyleDataGrid

在設定屬性之前將Style所有DataGridColumnHeader元素的屬性設定為可能會解決您的問題。nullHeaderStyleDataGrid

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