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在这里,我在 WPF 中有一个用户控件,它基本上是在一个窗格中显示文件夹树,另一个窗格(列表视图)显示该目录中的文件。

现在我公开了一个名为 fileextensionfilter 的属性,它基本上只需要在列表视图中显示特定文件。例如,如果 fileextensionfilter= XML 它只显示 xml 文件。

现在在我的主应用程序中,我三次使用上述控件,但使用不同的文件扩展文件,例如 1>xml 另一个实例仅 .pdf 等等....

现在我从 settings.default.xmlfilter、settings.default.PDFFilter 等获取扩展过滤器值......

这里的问题是当我加载 usercontrol 的控件属性时没有初始化,并且我在构造函数中有一些东西使用了这个属性和(当时“null”)所以过滤器第一次不起作用。接下来再次刷新过滤器属性将被应用,因此它可以工作。

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1 回答 1

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您可以尝试使用当前属性并使用Loaded事件来运行您当前在构造函数中运行的代码。这是一个小例子:

主窗口.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="350" Width="525" xmlns:my="clr-namespace:WpfApplication1">
    <Grid>
        <my:UserControl1 FileExtensionFilter="RTF" HorizontalAlignment="Left" Margin="10,10,0,0" x:Name="userControl1" VerticalAlignment="Top" />
        <my:UserControl1 FileExtensionFilter="XML" HorizontalAlignment="Left" Margin="10,10,0,0" x:Name="userControl2" VerticalAlignment="Top" />
        <my:UserControl1 FileExtensionFilter="PDF" HorizontalAlignment="Left" Margin="10,10,0,0" x:Name="userControl3" VerticalAlignment="Top" />
    </Grid>
</Window>

用户控制

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 WpfApplication1
{
    /// <summary>
    /// Interaction logic for UserControl1.xaml
    /// </summary>
    public partial class UserControl1 : UserControl
    {
        string filter = "NULL";
        public UserControl1()
        {
            InitializeComponent();
            System.Diagnostics.Debug.WriteLine("Property" + filter + "Set during Constructor");
        }

        public string FileExtensionFilter
        {
            get { return filter; }
            set { filter = value; }
        }

        private void UserControl_Loaded(object sender, RoutedEventArgs e)
        {
            System.Diagnostics.Debug.WriteLine("Property" + filter + "Set during Loaded");
        }

        private void UserControl_Initialized(object sender, EventArgs e)
        {
            System.Diagnostics.Debug.WriteLine("Property" + filter + "Set during Initialized");
        }
    }
}

输出

PropertyNULLSet during Initialized
PropertyNULLSet during Initialized PropertyNULLSet during Initialized PropertyNULLSet
during Initialized PropertyNULLSet during Initialized
PropertyNULLSet during Constructor PropertyRTFSet during Loaded PropertyXMLSet during Loaded PropertyPDFSet during Loaded




于 2012-11-23T04:13:32.743 回答