.NET 3.5(3) - C# 3.0新特性之Automatic Properties（自动属性）

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步步为营VS 2008 + .NET 3.5(3) - C# 3.0新特性之Automatic Properties（自动属性）、Object Initializers（对象初始化器）、Collection Initializers（集合初始化器）和Extension Methods（扩展方法）

作者：webabcd


介绍
    ·Automatic Properties（自动属性）
    ·Object Initializers（对象初始化器）
    ·Collection Initializers（集合初始化器）
    ·Extension Methods（扩展方法）


示例
AutomaticProperties.cs（自动属性）

using System;
using System.Data;
using System.Configuration;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Xml.Linq;

/// <summary>
/// AutomaticProperties（自动属性）的摘要说明
/// </summary>
public class AutomaticProperties
{
        public int ID { get; set; }

        // 上面的ID属性（自动属性）等同于下面的ID属性

        // private int _id;
        // public int ID
        // {
        //         get { return _id; }
        //         set { _id = value; }
        // }
}

 

ObjectInitializers.cs（对象初始化器）

using System;
using System.Data;
using System.Configuration;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Xml.Linq;

/// <summary>
/// ObjectInitializers（对象初始化器）的摘要说明
/// </summary>
public class ObjectInitializers
{
        public int ID { get; set; }
        public string Name { get; set; }

        public void ObjectInitializersTest()
        {
                ObjectInitializers oi = new ObjectInitializers { ID = 1, Name = "webabcd" };

                // 上面的oi对象（对象初始化器）等同于下面的oi对象

                // ObjectInitializers oi = new ObjectInitializers();
                // oi.ID = 1;
                // oi.Name = "webabcd";
        }
}

 

CollectionInitializers.cs（集合初始化器）

using System;
using System.Data;
using System.Configuration;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Xml.Linq;

using System.Collections.Generic;

/// <summary>
/// CollectionInitializers（集合初始化器）的摘要说明
/// </summary>
public class CollectionInitializers
{
        public int ID { get; set; }
        public string Name { get; set; }

        public void CollectionInitializersTest()
        {
                List<CollectionInitializers> list = new List<CollectionInitializers>
                {
                        new CollectionInitializers { ID = 1, Name = "webabcd" },
                        new CollectionInitializers { ID = 2, Name = "webabcdefg" },
                        new CollectionInitializers { ID = 3, Name = "webabcdefghijklmn" }
                };

                // 上面的list集合（集合初始化器）等同于下面的list集合

                // List<CollectionInitializers> list = new List<CollectionInitializers>();
                // list.Add(new CollectionInitializers { ID = 1, Name = "webabcd" });
                // list.Add(new CollectionInitializers { ID = 2, Name = "webabcdefg" });
                // list.Add(new CollectionInitializers { ID = 3, Name = "webabcdefghijklmn" });
        }
}

 

ExtensionMethods.cs（扩展方法）

using System;
using System.Data;
using System.Configuration;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Xml.Linq;

/// <summary>
/// ExtensionMethods 的摘要说明
/// </summary>
public class ExtensionMethods
{
        public void ExtensionMethodsTest()
        {
                string s = "123";
                // 使用string的ToInt32()扩展方法
                int i = s.ToInt32();
                // i == 123

                string[] ary = new string[] { "a", "b", "c" };
                // 使用object的In()扩展方法
                bool b = "b".In(ary);
                // b == true
        }
}

/// <summary>
/// 扩展方法（类和方法均为static）
/// 使用的时候要引用该类的命名空间
/// </summary>
public static class MyExtensionMethods
{
        // this代表扩展方法应用于string类型上
        // ToInt32()是将string类型转换为int类型的扩展方法
        public static int ToInt32(this string s)
        {
                int i;
                Int32.TryParse(s, out i);

                return i;
        }

        // this代表扩展方法应用于object类型上
        // 该扩展方法需要一个类型为System.Collections.IEnumerable的参数
        // In()是判断一个object是否存在于一个System.Collections.IEnumerable中的扩展方法
        public static bool In(this object o, System.Collections.IEnumerable e)
        {
                foreach (object i in e)
                {
                        if (i.Equals(o))
                        {
                                return true;
                        }
                }

                return false;
        }
}

 

 

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本文出自 “webabcd” 博客，请务必保留此出处http://webabcd.blog.51cto.com/1787395/344909