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我對.NET 4.0 DataGrid有一個很令人不安的問題。我有包含啓用了textWrapping的TextBlock的比例模板列。調整包含包裝TextBlocks的DataGrid的問題調整大小
問題是，在加載時DataGrid的高度不正確（它的大小就好像文本塊全部被包裝在最大值一樣），並且在調整大小時不更新它們的大小。它似乎是一個佈局問題（MeasureOverride和ArrangeOverride似乎在比例尺寸未解決時調用，之後不會調用...），但我無法解決它。
下面是一個簡化的代碼，示出了該問題：
MainWindow.xaml
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="700" Width="525">
<StackPanel Width="500">
<Button Content="Add DataGrid" Click="Button_Click" />
<ItemsControl x:Name="itemsControl">
<ItemsControl.ItemContainerStyle>
<Style>
<Setter Property="Control.Margin" Value="5" />
</Style>
</ItemsControl.ItemContainerStyle>
</ItemsControl>
</StackPanel>
MainWindow.xaml.cs
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Media;
namespace WpfApplication1
{
public partial class MainWindow : System.Windows.Window
{
public MainWindow()
{
InitializeComponent();
}
private void Button_Click(object sender, RoutedEventArgs e)
{
itemsControl.Items.Add(CreateDataGrid());
}
private DataGrid CreateDataGrid()
{
var dataGrid = new DataGrid() { HeadersVisibility = DataGridHeadersVisibility.Column };
dataGrid.MaxWidth = 500;
dataGrid.Background = Brushes.LightSteelBlue;
dataGrid.Columns.Add(GetDataGridTemplateColumn("Label", "Auto"));
dataGrid.Columns.Add(GetDataGridTemplateColumn("Value", "*"));
dataGrid.Items.Add(new Entry() { Label = "Text Example 1", Value = "Some wrapped text" });
dataGrid.Items.Add(new Entry() { Label = "Text Example 2", Value = "Some wrapped text" });
return dataGrid;
}
private DataGridTemplateColumn GetDataGridTemplateColumn(string bindingPath, string columnWidth)
{
DataGridTemplateColumn result = new DataGridTemplateColumn() { Width = (DataGridLength)(converter.ConvertFrom(columnWidth))};
FrameworkElementFactory cellTemplateframeworkElementFactory = new FrameworkElementFactory(typeof(TextBox));
cellTemplateframeworkElementFactory.SetValue(TextBox.NameProperty, "cellContentControl");
cellTemplateframeworkElementFactory.SetValue(TextBox.TextProperty, new Binding(bindingPath));
cellTemplateframeworkElementFactory.SetValue(TextBox.TextWrappingProperty, TextWrapping.Wrap);
result.CellTemplate = new DataTemplate() { VisualTree = cellTemplateframeworkElementFactory };
return result;
}
private static DataGridLengthConverter converter = new DataGridLengthConverter();
}
public class Entry
{
public string Label { get; set; }
public string Value { get; set; }
}
}
