-----------------------------------IDocument.cs(定义一个接口)
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace ConsoleApplication3 { public interface IDocument { string Title { get; set; }//文本标题 string Content { get; set; }//文本内容 } }
-----------------------------------Document.cs(用于实现接口的一个类)
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace ConsoleApplication3 { public class Document : IDocument//实现了接口IDocument的类 { private string _title; private string _content; public string Title { get { return _title; } set { _title = value; } } public string Content { get { return _content; } set { _content = value; } } public Document(string title,string content) { this.Title = title; this.Content = content; } } }
-----------------------------------DocumentManage.cs(泛型类)
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Collections; namespace ConsoleApplication3 { public class DocumentManage<TDocuemnt> where TDocuemnt : IDocument //约束:该类必须实现了IDocuemnt的接口 { //实例化一个存放对象的队列 private readonly Queue<TDocuemnt> documentQuery = new Queue<TDocuemnt>(); public void AddDocument(TDocuemnt t)//添加对象到documentQuery队列中 { documentQuery.Enqueue(t); } public bool IsADocumentAvailable { get { return documentQuery.Count > 0; } }//判断documentQuery队列中有没有值 public void DisplayAllDocuments()//查询所有的对象 { foreach (TDocuemnt t in documentQuery) { Console.WriteLine(((IDocument)t).Title); Console.ReadKey(); } } } }
-----------------------------------主程序
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace ConsoleApplication3 { class Program { static void Main(string[] args) { DocumentManage<Document> dm = new DocumentManage<Document>(); dm.AddDocument(new Document("标题1", "内容1")); dm.AddDocument(new Document("标题2", "内容2")); if (dm.IsADocumentAvailable) { dm.DisplayAllDocuments();//输出标题1,标题2 } } } }
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where T:struct 对于结构的约束,类型必须是值类型
where T:class 类约束指定的类型必须是引用类型
where T:IFoo 指定的类型T必须实现接口IFoo
where T:Foo 指定的类型T必须派生自基类Foo
where T:new() 指定一个构造函数约束,指定类型T必须有一个默认的构造函数
where T1:T2 这个约束也可以指定,类型T1派生自泛型类型T2。该约束也称为裸类型约束
时间: 2024-10-15 00:56:26