我在以UserControls
编程方式显示自定义ListBox
时遇到问题。我似乎无法弄清楚出了什么问题。列表项显示没有图像或文本。
我的项目包括:
MainWindow.xaml.cs代码
private void cvMenuItem_MouseLeftButtonUp_1(object sender, MouseButtonEventArgs e)
{
lstContacts.Items.Clear();
cvMenuItem test = new cvMenuItem("test",
Environment.GetEnvironmentVariable("USERPROFILE") + @"\Downloads\images.jpg");
lstContacts.Items.Add(test);
}
cvMenuItem.xaml.cs代码
public partial class cvMenuItem : UserControl
{
public cvMenuItem()
{
InitializeComponent();
}
public cvMenuItem(string text, string Logo)
{
this.Height = 50;
this.Width = 186;
txtService = new TextBlock() { Width = 100, Height = 50 };
imgLogo = new Image() { Width = 50, Height = 50 };
//Just found out, adding the objects as childeren partially works
this.AddChild(imgLogo);
//But I can't add txtService as Childeren
//this.AddChild(txtService);
this.Services = text;
this.Logo = Logo;
}
public string Services
{
get{ return txtService.Text.ToString() }
set
{
txtService.Text = value;
}
}
public string Logo
{
get{ return imgLogo.Source.ToString(); }
set
{
var uriSource = new Uri(value);
imgLogo.Source = new BitmapImage(uriSource);
}
}
我的cvMenuItem.xaml.cs
<UserControl x:Class="WpfApplication1.cvMenuItem"
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" Height="50" Width="186">
<Grid Width="186" VerticalAlignment="Top">
<Image Name="imgLogo" Height="50" Width="50" HorizontalAlignment="Left" VerticalAlignment="Top" OpacityMask="{DynamicResource {x:Static SystemColors.ActiveCaptionTextBrushKey}}" />
<TextBlock Name="txtService" HorizontalAlignment="Left" TextWrapping="Wrap" Text="TextBlock" VerticalAlignment="Bottom" Height="18" Width="121" Margin="70,0,0,18" RenderTransformOrigin="0.499,1.932"/>
</Grid>
</UserControl>
答案 0 :(得分:1)
首先,您需要在已添加的自定义构造函数中调用InitializeComponent
,因为需要正确处理XAML。否则,在运行应用程序时,您在XAML中添加的所有控件都将为null。
此外,在代码隐藏中再次创建TextBlock
和Image
毫无意义。您只需使用在XAML中创建的那些。
为了使其正常工作,请将构造函数中的代码更改为以下内容:
public cvMenuItem(string text, string Logo)
{
InitializeComponent();
this.Height = 50;
this.Width = 186;
this.Services = text;
this.Logo = Logo;
}