我是WPF的新手,所以这可能是一个愚蠢的问题,但事实确实如此。
我正在尝试使用XAML来创建自定义按钮,所以这就是我所拥有的:

<Button x:Class="Controls.ShinyButton"
             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"
             mc:Ignorable="d"
             d:DesignHeight="300" d:DesignWidth="300" Height="40" Width="150">
    <Button.Resources>
        <ResourceDictionary Source=".\Resources.xaml" />
    </Button.Resources>

    <Border Background="{StaticResource BlueGradient}" CornerRadius="5">
        <DockPanel>
            <Image x:Name="imgIcon" DockPanel.Dock="Left" Height="32" Margin="4"/>
            <TextBlock DockPanel.Dock="Right" Text ="Test" VerticalAlignment="Center" HorizontalAlignment="Left" Foreground="White" />
        </DockPanel>
    </Border>

    <Button.Background>
        <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
            <GradientStop Color="#FF02B6FF" Offset="0" />
            <GradientStop Color="#FF0084F0" Offset="1" />
        </LinearGradientBrush>
    </Button.Background>
 </Button>


设计人员理解它并且可以正确编译,但是当我尝试运行程序并创建它的实例时,出现了错误:
“ ContentControl的内容必须是单个元素。”

我的资源文件是:

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">

    <LinearGradientBrush x:Key="BlueGradient">
        <GradientStop Offset="0" Color="#FF02B6FF"/>
        <!-- (2, 182, 255)-->
        <GradientStop Offset="1" Color="#FF0084F0"/>
        <!-- (0, 132, 240) -->
    </LinearGradientBrush>

</ResourceDictionary>


我的边框内有DockPanel,因此该按钮只有一个孩子...
“ ShinyButton”类如下所示:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace Controls
{
    /// <summary>
    /// Interaction logic for ShinyButton.xaml
    /// </summary>
    public partial class ShinyButton : Button
    {
        public ShinyButton()
        {
            InitializeComponent();
        }
    }
}


在主函数中,我像这样添加它:

public MainWindow()
        {
            InitializeComponent();

            ShinyButton shiny = new ShinyButton();
            this.AddChild(shiny); //This is where the exception is thrown.

        }


我究竟做错了什么?

最佳答案

只是一个猜测,我无法测试它,但是请尝试以下代码:

<Button.Template>
    <ControlTemplate>
        <Border Background="{StaticResource BlueGradient}" CornerRadius="5">
            <DockPanel>
                <Image x:Name="imgIcon" DockPanel.Dock="Left" Height="32" Margin="4"/>
                <TextBlock DockPanel.Dock="Right" Text ="Test" VerticalAlignment="Center" HorizontalAlignment="Left" Foreground="White" />
            </DockPanel>
        </Border>
    </ControlTemplate>
</Button.Template>


编辑:确定下一次尝试:

而不是将ShinyButton添加到窗口中(删除this.AddChild(shiny)),请尝试通过添加以下代码将ShinyButton添加到网格中:

NameOfGrid.Children.Add(shiny);


出现此错误的原因是,您的Window只能有一个孩子,我敢打赌,您的情况已经有一个网格作为该孩子。

关于wpf - “ContentControl的内容必须是单个元素。”异常(exception),我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/12609724/

10-09 06:16