DataType绑定到文件夹内的类 [英] DataType Bind to Class inside a Folder

问题描述

您好，

我想将Combobox的DataTemplate绑定到数据类型Part，它位于我的CSharp项目中的Compnents文件夹中。当我尝试使用点表示法绑定时，（即Components.CPUPart）会得到一个类型未找到错误以及 嵌套
类型不支持错误。解决方案是什么。

解决方案

您好DSBD，

根据您的描述，您需要绑定子文件夹中的数据（Compnents）。 因为您没有提供相关代码，我不确定是什么原因造成的。你能否提供相关的代码，可以重现这个问题。

此外，这里有一个包含子文件夹的示例，它使用MVVM模式作为参考。

#Model& ViewModel

使用System.Collections.Generic;使用System.ComponentModel 
; 
使用System.Windows.Data; 
 
 namespace WpfApp1.Compnents 
 {
 
 public class PhoneBookEntry 
 {
 public string CPUPart {get;组; } 
 
 public PhoneBookEntry（string name）
 {
 CPUPart = name; 
} 
 
公共覆盖字符串ToString（）
 {
返回CPUPart; 
} 
} 
公共类ConnectionViewModel：INotifyPropertyChanged 
 {
 public ConnectionViewModel（）
 {
 IList< PhoneBookEntry> list = new List< PhoneBookEntry>（）; 
 list.Add（new PhoneBookEntry（" TEST1"））; 
 list.Add（new PhoneBookEntry（" TEST2"））; 
 list.Add（new PhoneBookEntry（" TEST3"））; 
 list.Add（new PhoneBookEntry（" TEST4"））; 
 list.Add（new PhoneBookEntry（" TEST5"））; 
 _phonebookEntries = new CollectionView（list）; 
} 
 
 private readonly CollectionView _phonebookEntries; 
 private PhoneBookEntry _phonebookEntry; 
 
 public CollectionView EntitiesData 
 {
 get {return _phonebookEntries; } 
} 
 
 public PhoneBookEntry SelectedEntity 
 {
 get {return _phonebookEntry; } 
设置
 {
 if（_phonebookEntry == value）return; 
 _phonebookEntry = value; 
 OnPropertyChanged（" SelectedEntity"）; 
} 
} 
 
 private void OnPropertyChanged（string propertyName）
 {
 if（PropertyChanged！= null）
 PropertyChanged（this，new PropertyChangedEventArgs（propertyName的））; 
} 
公共事件PropertyChangedEventHandler PropertyChanged; 
} 
} 

#XAML

< Window x：Class =" ; WpfApp1.Window22" 
 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" 
 xmlns：local =" clr-namespace：WpfApp1" 
 mc：Ignorable =" d" 
 Title =" Window22"高度= QUOT; 450"宽度= QUOT; 800"> 
< Grid> 
< StackPanel> 
< ComboBox Margin =" 20,50,20,20" X：名称= QUOT; combobox1"宽度= QUOT; 220" ItemsSource =" {Binding EntitiesData}" SelectedItem =" {Binding SelectedEntity}" > 
< ComboBox.ItemTemplate> 
< DataTemplate> 
< Grid Horizo​​ntalAlignment =" Stretch"> 
< Grid.ColumnDefinitions> 
< ColumnDefinition Width =" auto" /> 
< /Grid.ColumnDefinitions> 
< TextBlock Text =" {Binding CPUPart，Mode = OneWay}"余量= QUOT; 5,0" /> 
< / Grid> 
< / DataTemplate> 
< /ComboBox.ItemTemplate> 
< / ComboBox> 
< / StackPanel> 
< / Grid> 
< / Window> 

#Code Behind

使用System.Windows; 
 
名称空间WpfApp1 
 {
 ///< summary> 
 /// Window22.xaml的互动逻辑
 ///< / summary> 
 public partial class Window22：Window 
 {
 public Window22（）
 {
 InitializeComponent（）; 
 this.DataContext = new Compnents.ConnectionViewModel（）; 
} 
} 
} 

祝你好运，

张龙

Hello,

I would like to bind the DataTemplate of a Combobox to the datatype Part, which resides in my Compnents Folder in my CSharp project. When I attempt to bind using dot notation, (i.e. Components.CPUPart) is get a type not found error aswell as a  Nested Types not supported error. What is the solution.

解决方案

Hi DSBD,

According to your description, you want to bind data in the subfolder(Compnents).  because you have not provide related code, I am not sure what cause the issue. could you please provide related code, which could reproduce the issue.

In addition, here is a sample with subfolder, which use MVVM pattern for your reference.

#Model & ViewModel

using System.Collections.Generic;
using System.ComponentModel;
using System.Windows.Data;

namespace WpfApp1.Compnents
{

    public class PhoneBookEntry
    {
        public string CPUPart { get; set; }

        public PhoneBookEntry(string name)
        {
            CPUPart = name;
        }

        public override string ToString()
        {
            return CPUPart;
        }
    }
    public class ConnectionViewModel : INotifyPropertyChanged
    {
        public ConnectionViewModel()
        {
            IList<PhoneBookEntry> list = new List<PhoneBookEntry>();
            list.Add(new PhoneBookEntry("TEST1"));
            list.Add(new PhoneBookEntry("TEST2"));
            list.Add(new PhoneBookEntry("TEST3"));
            list.Add(new PhoneBookEntry("TEST4"));
            list.Add(new PhoneBookEntry("TEST5"));
            _phonebookEntries = new CollectionView(list);
        }

        private readonly CollectionView _phonebookEntries;
        private PhoneBookEntry _phonebookEntry;

        public CollectionView EntitiesData
        {
            get { return _phonebookEntries; }
        }

        public PhoneBookEntry SelectedEntity
        {
            get { return _phonebookEntry; }
            set
            {
                if (_phonebookEntry == value) return;
                _phonebookEntry = value;
                OnPropertyChanged("SelectedEntity");
            }
        }

        private void OnPropertyChanged(string propertyName)
        {
            if (PropertyChanged != null)
                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
        public event PropertyChangedEventHandler PropertyChanged;
    }
}

#XAML

<Window x:Class="WpfApp1.Window22"
        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"
        xmlns:local="clr-namespace:WpfApp1"
        mc:Ignorable="d"
        Title="Window22" Height="450" Width="800">
    <Grid>
        <StackPanel>
        <ComboBox Margin="20,50,20,20" x:Name="combobox1" Width="220" ItemsSource="{Binding EntitiesData}"  SelectedItem="{Binding SelectedEntity}" >
            <ComboBox.ItemTemplate>
                <DataTemplate>
                    <Grid HorizontalAlignment="Stretch">
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="auto"/>
                        </Grid.ColumnDefinitions>
                            <TextBlock Text="{Binding CPUPart, Mode=OneWay}" Margin="5,0" />
                    </Grid>
                </DataTemplate>
            </ComboBox.ItemTemplate>
        </ComboBox>
        </StackPanel>
    </Grid>
</Window>

#Code Behind

using System.Windows;

namespace WpfApp1
{
    /// <summary>
    /// Interaction logic for Window22.xaml
    /// </summary>
    public partial class Window22 : Window
    {
        public Window22()
        {
            InitializeComponent();
            this.DataContext = new Compnents.ConnectionViewModel();
        }
    }
}

Best regards,

Zhanglong

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