C#教程

关注公众号 jb51net

关闭
首页 > 软件编程 > C#教程 > C#类继承自泛型集合

C#类继承自泛型集合的例子

作者:VinciYan

在C#中,除了泛型字典外,你还可以继承其他集合类型,本文通过实例代码主要介绍了C#类继承自泛型集合,需要的朋友可以参考下

继承自泛型字典的例子

这段代码定义了一个多层嵌套的字典结构,旨在组织和存储复杂的层级数据

using System;
using System.Threading.Tasks;
class Contract : Dictionary<string, Dictionary<string, Dictionary<string, string>>>
{
    private readonly string type = "autodesk.data:exchange.contract.dynamo-1.0.0";
    public Contract()
    {
        var contractContent = new Dictionary<string, Dictionary<string, string>>
            {
                { "contract", new Dictionary<string, string>() }
            };
        Add(type, contractContent);
    }
}
class Program
{
    static void Main()
    {
        // Create an instance of Contract
        var contract = new Contract();
        // Access the outer dictionary using the predefined type key
        var typeKey = "autodesk.data:exchange.contract.dynamo-1.0.0";
        // Check if the key exists and add data
        if (contract.TryGetValue(typeKey, out var contractContent))
        {
            // Access the inner dictionary with the key "contract"
            if (contractContent.TryGetValue("contract", out var innerDictionary))
            {
                // Add key-value pairs to the innermost dictionary
                innerDictionary["key1"] = "value1";
                innerDictionary["key2"] = "value2";
                // Retrieve and display values
                Console.WriteLine(innerDictionary["key1"]); // Outputs: value1
                Console.WriteLine(innerDictionary["key2"]); // Outputs: value2
            }
        }
    }
}
value1
value2

再看一个Dynamo项目实例,这段代码的目的是创建一个嵌套字典结构,用于存储有关二进制引用组件的属性数据。使用接口IPropertySet作为多态机制的基础。通过嵌套字典结构实现多层次数据的组织和访问。提供灵活的属性管理,适合复杂对象的属性存储场景

using System;
using System.Threading.Tasks;
class BinaryReferenceComponent : Dictionary<string, Dictionary<string, IPropertySet>>
{
    private string objectId = "autodesk.data:binary.reference.component-1.0.0";
    public string ObjectId { get { return objectId; } }
    public BinaryReferenceComponent(string binaryId)
    {
        var propertyDictionary = new Dictionary<string, IPropertySet>();
        propertyDictionary.Add("String", new StringPropertySet(binaryId));
        propertyDictionary.Add("Uint32", new IntPropertySet());
        this.Add("binary_reference", propertyDictionary);
    }
}
class StringPropertySet : IPropertySet
{
    public string Id { get; set; }
    public string Revision { get; set; }
    public StringPropertySet(string binaryId, string revision = "v0")
    {
        Id = binaryId;
        Revision = revision;
    }
}
class IntPropertySet : IPropertySet
{
    public int End { get; set; }
    public int Start { get; set; }
    public IntPropertySet(int start = 0, int end = 8710)
    {
        End = end;
        Start = start;
    }
}
interface IPropertySet { }
class Program
{
    static void Main()
    {
        // Create an instance of BinaryReferenceComponent with a binaryId
        var binaryReference = new BinaryReferenceComponent("exampleBinaryId");
        // Access ObjectId
        Console.WriteLine($"ObjectId: {binaryReference.ObjectId}");
        // Access properties of the component
        if (binaryReference.TryGetValue("binary_reference", out var propertySet))
        {
            if (propertySet.TryGetValue("String", out var stringProperty))
            {
                var stringProp = stringProperty as StringPropertySet;
                Console.WriteLine($"StringProperty Id: {stringProp.Id}, Revision: {stringProp.Revision}");
            }
            if (propertySet.TryGetValue("Uint32", out var intProperty))
            {
                var intProp = intProperty as IntPropertySet;
                Console.WriteLine($"IntProperty Start: {intProp.Start}, End: {intProp.End}");
            }
        }
    }
}
ObjectId: autodesk.data:binary.reference.component-1.0.0
StringProperty Id: exampleBinaryId, Revision: v0
IntProperty Start: 0, End: 8710

继承多种集合类型

在C#中,除了泛型字典外,你还可以继承其他集合类型,例如:

示例:继承 Collection

代码说明

关键点

using System;
using System.Collections.ObjectModel;
class CustomCollection<T> : Collection<T>
{
    // Event triggered when an item is added
    public event Action<T> ItemAdded;
    // Custom implementation of InsertItem
    protected override void InsertItem(int index, T item)
    {
        // Add custom behavior before inserting
        Console.WriteLine($"Inserting item at index {index}: {item}");
        base.InsertItem(index, item);
        // Trigger the event after inserting
        ItemAdded?.Invoke(item);
    }
    // Method to display all items
    public void DisplayItems()
    {
        Console.WriteLine("Current items in collection:");
        foreach (var item in this)
        {
            Console.WriteLine(item);
        }
    }
}
class Program
{
    static void Main()
    {
        // Create an instance of CustomCollection
        var collection = new CustomCollection<string>();
        // Subscribe to the ItemAdded event
        collection.ItemAdded += item => Console.WriteLine($"Item added: {item}");
        // Add items to the collection
        collection.Add("Item1");
        collection.Add("Item2");
        collection.Add("Item3");
        // Display all items in the collection
        collection.DisplayItems();
    }
}

运行结果:

Inserting item at index 0: Item1
Item added: Item1
Inserting item at index 1: Item2
Item added: Item2
Inserting item at index 2: Item3
Item added: Item3
Current items in collection:
Item1
Item2
Item3

注意

在C#中,类继承自泛型字典并不常见。以下是一些原因和建议:

原因

建议

将前面的一个继承的例子改为使用组合,运行结果不变

using System;
using System.Collections.Generic;
interface IPropertySet { }
class StringPropertySet : IPropertySet
{
    public string Id { get; set; }
    public string Revision { get; set; }
    public StringPropertySet(string binaryId, string revision = "v0")
    {
        Id = binaryId;
        Revision = revision;
    }
}
class IntPropertySet : IPropertySet
{
    public int End { get; set; }
    public int Start { get; set; }
    public IntPropertySet(int start = 0, int end = 8710)
    {
        End = end;
        Start = start;
    }
}
class BinaryReferenceComponent
{
    private Dictionary<string, Dictionary<string, IPropertySet>> properties = new();
    public string ObjectId { get; } = "autodesk.data:binary.reference.component-1.0.0";
    public BinaryReferenceComponent(string binaryId)
    {
        var propertyDictionary = new Dictionary<string, IPropertySet>
        {
            { "String", new StringPropertySet(binaryId) },
            { "Uint32", new IntPropertySet() }
        };
        properties.Add("binary_reference", propertyDictionary);
    }
    public Dictionary<string, IPropertySet> GetProperties(string key)
    {
        properties.TryGetValue(key, out var result);
        return result;
    }
}
class Program
{
    static void Main()
    {
        // Create an instance of BinaryReferenceComponent
        var binaryReference = new BinaryReferenceComponent("exampleBinaryId");
        // Access ObjectId
        Console.WriteLine($"ObjectId: {binaryReference.ObjectId}");
        // Retrieve properties using GetProperties method
        var properties = binaryReference.GetProperties("binary_reference");
        if (properties != null)
        {
            if (properties.TryGetValue("String", out var stringProperty))
            {
                var stringProp = stringProperty as StringPropertySet;
                Console.WriteLine($"StringProperty Id: {stringProp.Id}, Revision: {stringProp.Revision}");
            }
            if (properties.TryGetValue("Uint32", out var intProperty))
            {
                var intProp = intProperty as IntPropertySet;
                Console.WriteLine($"IntProperty Start: {intProp.Start}, End: {intProp.End}");
            }
        }
        else
        {
            Console.WriteLine("No properties found for the given key.");
        }
    }
}

参考

到此这篇关于C#类继承自泛型集合的文章就介绍到这了,更多相关C#类继承自泛型集合内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家!

您可能感兴趣的文章:
阅读全文