動態PropertyGrid屬性

Question

因此，對於我正在研究的這個項目，我們決定使用.NET PropertyGrid控件。 根據用戶在ListView控件中選擇的項目，將根據運行時構建的對象填充propertygrid。

因此，如果他們選擇ListView中的第一個項目（例如“Base”），PropertyGrid將顯示該組件的屬性，例如其尺寸。 然后他們選擇“Top”，它將在PropertyGrid中顯示顏色。 無論哪種方式，列表中的每個項目都是一個“組件”對象。

基本上，當選擇ListView項時，循環遍歷數據集以查找與所選組件對象關聯的屬性，然后將其拋入propertygrid中顯示的propertybag類。

我想弄清楚的是，由於這些組件和屬性都是一個類，我如何動態確定哪些屬性應該顯示為下拉菜單，圖像框或文本字段。

我正在使用Visual Studios 2010 / C＃.NET，而對於動態屬性生成，我使用的是我在CodeProject上由Tony Allowatt發現的顯然很受歡迎的“Property Bag”類。 我唯一能想到的可能是為數據庫添加一個額外的列來獲取屬性，並使用它來告訴PropertyBag要添加哪些數據類型？ 它似乎是一個熱門話題，但我很難找到如何與動態構建的對象一起完成它。

Answer 1

它本身不是一個答案，但我也一直在努力建立這樣一個野獸。 這是stackoverflow對該主題的最大熱門......

如何在運行時修改PropertyGrid（添加/刪除屬性和動態類型/枚舉）

如何在屬性網格中顯示動態對象？

PropertyGrid和動態對象類型

起初我雖然實際上需要基於Expando對象的動態對象，但事實證明並非如此。 您可能希望確保不要陷入該陷阱。

在我的情況下，我真正需要的是一組自定義對象，可以添加一組可變屬性。 其中每個屬性都是三種自定義類型之一（stringType，rangeType或enumType）的實例化。 一旦我意識到“動態”屬性不會是任意類類型，項目就變成了三個stackoverflow示例中討論的代碼的簡單轉折。 問題如何在運行時修改PropertyGrid（添加/刪除屬性和動態類型/枚舉）幾乎是我最終結果的直接示例。

希望我的隨意幫助你找到自己的道路......

Answer 2

對於wpf，這可以解決整個問題：鏈接到源https://xceed.com/forums/topic/propertygrid-dictionary-not-displaying-values-using-icustomtypedescriptor/

using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Runtime.CompilerServices;

[RefreshProperties(RefreshProperties.All)]
public class DictionaryPropertyGridAdapter<TKey, TValue> : ICustomTypeDescriptor, INotifyPropertyChanged
{
    #region Fields

    private readonly IDictionary<TKey, PropertyAttributes> propertyAttributeDictionary;

    private readonly IDictionary<TKey, TValue> propertyValueDictionary;

    #endregion

    #region Constructors and Destructors

    public DictionaryPropertyGridAdapter(
        IDictionary<TKey, TValue> propertyValueDictionary,
        IDictionary<TKey, PropertyAttributes> propertyAttributeDictionary = null)
    {
        this.propertyValueDictionary = propertyValueDictionary;
        this.propertyAttributeDictionary = propertyAttributeDictionary;
    }

    #endregion

    #region Events

    public event PropertyChangedEventHandler PropertyChanged;

    #endregion

    public AttributeCollection GetAttributes()
    {
        return TypeDescriptor.GetAttributes(this, true);
    }

    public string GetClassName()
    {
        return TypeDescriptor.GetClassName(this, true);
    }

    public string GetComponentName()
    {
        return TypeDescriptor.GetComponentName(this, true);
    }

    public TypeConverter GetConverter()
    {
        return TypeDescriptor.GetConverter(this, true);
    }

    public EventDescriptor GetDefaultEvent()
    {
        return TypeDescriptor.GetDefaultEvent(this, true);
    }

    public PropertyDescriptor GetDefaultProperty()
    {
        return null;
    }

    public object GetEditor(Type editorBaseType)
    {
        return TypeDescriptor.GetEditor(this, editorBaseType, true);
    }

    public EventDescriptorCollection GetEvents(Attribute[] attributes)
    {
        return TypeDescriptor.GetEvents(this, attributes, true);
    }

    public PropertyDescriptorCollection GetProperties(Attribute[] attributes)
    {
        ArrayList properties = new ArrayList();
        foreach (var kvp in this.propertyValueDictionary)
        {
            properties.Add(
                new DictionaryPropertyDescriptor(
                    kvp.Key,
                    this.propertyValueDictionary,
                    this.propertyAttributeDictionary));
        }

        PropertyDescriptor[] props = (PropertyDescriptor[])properties.ToArray(typeof(PropertyDescriptor));

        return new PropertyDescriptorCollection(props);
    }

    public object GetPropertyOwner(PropertyDescriptor pd)
    {
        return this;
    }

    EventDescriptorCollection ICustomTypeDescriptor.GetEvents()
    {
        return TypeDescriptor.GetEvents(this, true);
    }

    PropertyDescriptorCollection ICustomTypeDescriptor.GetProperties()
    {
        return ((ICustomTypeDescriptor)this).GetProperties(new Attribute[0]);
    }

    //[NotifyPropertyChangedInvocator]
    protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
    {
        this.PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }

    public class PropertyAttributes
    {
        public string Category { get; set; }

        public string Description { get; set; }

        public string DisplayName { get; set; }

        public bool IsReadOnly { get; set; }
    }

    internal class DictionaryPropertyDescriptor : PropertyDescriptor
    {
        #region Fields

        private readonly IDictionary<TKey, PropertyAttributes> attributeDictionary;

        private readonly TKey key;

        private readonly IDictionary<TKey, TValue> valueDictionary;

        #endregion

        #region Constructors and Destructors

        internal DictionaryPropertyDescriptor(
            TKey key,
            IDictionary<TKey, TValue> valueDictionary,
            IDictionary<TKey, PropertyAttributes> attributeDictionary = null)
            : base(key.ToString(), null)
        {
            this.valueDictionary = valueDictionary;
            this.attributeDictionary = attributeDictionary;
            this.key = key;
        }

        #endregion

        public override string Category => this.attributeDictionary?[this.key].Category ?? base.Category;

        public override Type ComponentType => null;

        public override string Description => this.attributeDictionary?[this.key].Description ?? base.Description;

        public override string DisplayName => this.attributeDictionary?[this.key].DisplayName ?? base.DisplayName;

        public override bool IsReadOnly => this.attributeDictionary?[this.key].IsReadOnly ?? false;

        public override Type PropertyType => this.valueDictionary[this.key].GetType();

        public override bool CanResetValue(object component)
        {
            return false;
        }

        public override object GetValue(object component)
        {
            return this.valueDictionary[this.key];
        }

        public override void ResetValue(object component)
        {
        }

        public override void SetValue(object component, object value)
        {
            this.valueDictionary[this.key] = (TValue)value;
        }

        public override bool ShouldSerializeValue(object component)
        {
            return false;
        }
    }
}

對於viewmodel

class classViewModel : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;
    protected void OnPropertyChanged(string propertyName)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }
    private IDictionary<string, object> Variables { get; set; } = new ConcurrentDictionary<string, object>();
    private DictionaryPropertyGridAdapter<string, object> _selectedObj;
    public DictionaryPropertyGridAdapter<string, object> SelectedObj
    {
        get
        {

            this.Variables["Bool"] = false;
            this.Variables["Int"] = 200;
            this.Variables["Float"] = 200.5;
            this.Variables["String"] = "help";
            _selectedObj = new DictionaryPropertyGridAdapter<string, object>(this.Variables);


            return _selectedObj;
        }
        set {
            _selectedObj = value;
            OnPropertyChanged(nameof(this.SelectedObj));
        }
    }
}

和xaml

<Window x:Class="testPropertyGrid.MainWindow"
    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:testPropertyGrid"
    xmlns:wpftoolkit="http://schemas.xceed.com/wpf/xaml/toolkit"
    mc:Ignorable="d"
    Title="MainWindow" Height="350" Width="525">
<Window.Resources>
    <local:classViewModel x:Key="ViewModel"/>
</Window.Resources>
<Grid>
    <wpftoolkit:PropertyGrid Name="propertyGrid1" SelectedObject="{Binding SelectedObj ,Source={StaticResource ViewModel}}">

    </wpftoolkit:PropertyGrid>
</Grid>

Answer 3

我相信這個鏈接將為您提供體面的輸入來解決您的問題。 Hpe它有幫助。

編輯以包含鏈接的內容：

動態屬性聲明：

dynamic employee = new BusinessObject(); 
employee.FirstName = "John"; 
employee.LastName = "Doe"; 

支持動態屬性的類：

public class BusinessObject : DynamicObject 
{
     private readonly IDictionary<string, object> dynamicProperties = 
         new Dictionary<string, object>();

     public override bool TryGetMember(GetMemberBinder binder, out object result)
     {
          var memberName = binder.Name;
          return dynamicProperties.TryGetValue(memberName, out result);
     }

     public override bool TrySetMember(SetMemberBinder binder, object value)
     {
          var memberName = binder.Name;
          dynamicProperties[memberName] = value;
          return true;
     }
}