入坑之WPF使用MaterialDesign【第二天】简单对话框

效果图

使用WPF简单对话框

定义对话框模板SampleMessageDialog.xaml

<UserControl x:Class="test.SampleMessageDialog" 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
    xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes" 
    mc:Ignorable="d" d:DesignHeight="300" d:DesignWidth="300" MaxWidth="400">
    <Grid Margin="16">
        <Grid.RowDefinitions>
            <RowDefinition />
            <RowDefinition />
        </Grid.RowDefinitions>
        <TextBlock x:Name="Message" Margin="0 6 0 0" FontSize="18" Grid.Row="0" />
        <Button Grid.Row="1" IsDefault="True" Style="{DynamicResource MaterialDesignFlatButton}" HorizontalAlignment="Right" Margin="16 16 16 0" Command="{x:Static materialDesign:DialogHost.CloseDialogCommand}">
            ACCEPT
        </Button>
    </Grid>
</UserControl>
System.InvalidOperationException:“No loaded DialogHost instances.”

对应的SampleMessageDialog.cs

using System.Windows.Controls;

namespace test
{
    /// <summary>
    /// Interaction logic for SampleMessageDialog.xaml
    /// </summary>
    public partial class SampleMessageDialog : UserControl
    {
        public SampleMessageDialog()
        {
            InitializeComponent();
        }
    }
}

对应的函数

public async void MessageTips(string message, object sender, RoutedEventArgs e)
{
	var sampleMessageDialog = new SampleMessageDialog
	{
		Message = { Text = message }
	};
	await DialogHost.Show(sampleMessageDialog, "RootDialog");
}

在需要的位置使用

MessageTips("请确认", sender, e);

坑

直接用，会报错：
System.InvalidOperationException:“No loaded DialogHost instances.”
原因是对话框放置的位置找不到，这个放置的位置就是这里的 RootDialog

await DialogHost.Show(sampleMessageDialog, "RootDialog");

需要在windows.xaml里设置，把GRID内容放入到如下容器里面

<materialDesign:DialogHost Identifier="RootDialog">
……
</materialDesign:DialogHost>

爬了一整天。