c# - 为什么我不能在 Silverlight 中绑定(bind) Grid.RowDefinition 高度？

Question

当我运行以下 Silverlight 应用程序时，出现错误:

AG_E_PARSER_BAD_PROPERTY_VALUE [Line: 12 Position: 35]

我在 WPF 中尝试了相同的代码并且它运行良好，即中间网格行根据绑定(bind)值正确调整大小。

我必须更改此代码中的哪些内容才能避免在 Silverlight 中出现此错误？

XAML:

<UserControl x:Class="TestRowHeight222.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
    mc:Ignorable="d" d:DesignWidth="640" d:DesignHeight="480">
  <Grid x:Name="LayoutRoot">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*"/>
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition Height="30"/>
            <RowDefinition Height="{Binding ContentHeight}"/>
            <RowDefinition Height="30"/>
        </Grid.RowDefinitions>

        <StackPanel Grid.Row="0" Background="Tan">
            <TextBlock Text="row0" />
        </StackPanel>

        <StackPanel Grid.Row="1" Background="Beige" Orientation="Horizontal">
            <TextBlock Text="The height should be: "/>
            <TextBlock Text="{Binding ContentHeight}"/>
        </StackPanel>

        <StackPanel Grid.Row="2" Background="Tan">
            <TextBlock Text="row2"/>
        </StackPanel>
  </Grid>
</UserControl>

代码隐藏:

using System.Windows.Controls;
using System.ComponentModel;

namespace TestRowHeight222
{
    public partial class MainPage : UserControl, INotifyPropertyChanged
    {
        #region ViewModelProperty: ContentHeight
        private int _contentHeight;
        public int ContentHeight
        {
            get
            {
                return _contentHeight;
            }

            set
            {
                _contentHeight = value;
                OnPropertyChanged("ContentHeight");
            }
        }
        #endregion

        public MainPage()
        {
            InitializeComponent();
            DataContext = this;
            ContentHeight = 50;
        }

        #region INotifiedProperty Block
        public event PropertyChangedEventHandler PropertyChanged;

        protected void OnPropertyChanged(string propertyName)
        {
            PropertyChangedEventHandler handler = PropertyChanged;

            if (handler != null)
            {
                handler(this, new PropertyChangedEventArgs(propertyName));
            }
        }
        #endregion
    }
}

Answer 1

这是我能得到的最接近的，我不知道它是否适合你的情况。

<Grid x:Name="LayoutRoot">
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="*"/>
    </Grid.ColumnDefinitions>
    <Grid.RowDefinitions>
        <RowDefinition Height="30"/>
        <RowDefinition Height="Auto" />
        <RowDefinition Height="30"/>
    </Grid.RowDefinitions>

    <StackPanel Grid.Row="0" Background="Tan">
        <TextBlock Text="row0" />
    </StackPanel>

    <Grid Grid.Row="1" Height="{Binding ContentHeight}">
        <StackPanel  Background="Beige" Orientation="Horizontal">
            <TextBlock Text="The height should be: "/>
            <TextBlock Text="{Binding ContentHeight}"/>
        </StackPanel>
    </Grid>

    <StackPanel Grid.Row="2" Background="Tan">
        <TextBlock Text="row2"/>
    </StackPanel>
</Grid>

同时将您的 ContentHeight 属性更改为 double 值。