[索引頁]
[源碼下載]
步步為營VS 2008 + .NET 3.5(3) - C# 3.0新特性之Automatic Properties（自動屬性）、Object Initializers（對象初始化器）、Collection Initializers（集合初始化器）和Extension Methods（擴充方法）
作者：webabcd
介紹
·Automatic Properties（自動屬性）
·Object Initializers（對象初始化器）
·Collection Initializers（集合初始化器）
·Extension Methods（擴充方法）
樣本
AutomaticProperties.cs（自動屬性）
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（自動屬性）的摘要說明
/// </summary>
public class AutomaticProperties
{
public int ID { get; set; }
// 上面的ID屬性（自動屬性）等同於下面的ID屬性
// private int _id;
// public int ID
// {
// get { return _id; }
// set { _id = value; }
// }
} ObjectInitializers.cs（對象初始化器）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（對象初始化器）的摘要說明
/// </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對象（對象初始化器）等同於下面的oi對象
// 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）的摘要說明
/// </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）等同於下面的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（擴充方法）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 的摘要說明
/// </summary>
public class ExtensionMethods
{
public void ExtensionMethodsTest()
{
string s = "123";
// 使用string的ToInt32()擴充方法
int i = s.ToInt32();
// i == 123
string[] ary = new string[] { "a", "b", "c" };
// 使用object的In()擴充方法
bool b = "b".In(ary);
// b == true
}
}
/// <summary>
/// 擴充方法（類和方法均為static）
/// 使用的時候要引用該類的命名空間
/// </summary>
public static class MyExtensionMethods
{
// this代表擴充方法應用於string類型上
// ToInt32()是將string類型轉換為int類型的擴充方法
public static int ToInt32(this string s)
{
int i;
Int32.TryParse(s, out i);
return i;
}
// this代表擴充方法應用於object類型上
// 該擴充方法需要一個類型為System.Collections.IEnumerable的參數
// In()是判斷一個object是否存在於一個System.Collections.IEnumerable中的擴充方法
public static bool In(this object o, System.Collections.IEnumerable e)
{
foreach (object i in e)
{
if (i.Equals(o))
{
return true;
}
}
return false;
}
} OK
[源碼下載]
本文出自 “webabcd” 部落格，請務必保留此出處http://webabcd.blog.51cto.com/1787395/344909
