玩轉C#之【泛型】

介紹

• 輸入參數:int或string或DateTime
• 功能:印出輸入的"數值"

public class CommonMethod

    {

        /// <summary>

        /// 印出int數值

        /// </summary>

        /// <param name="iParameter"></param>

        public static void ShowInt(int iParameter)

        {

            Console.WriteLine("This is {0},parameter={1},type={2}",

                typeof(CommonMethod).Name, iParameter.GetType().Name, iParameter);

        }

        /// <summary>

        /// 印出string數值

        /// </summary>

        /// <param name="iParameter"></param>

        public static void ShowString(string iParameter)

        {

            Console.WriteLine("This is {0},parameter={1},type={2}",

                typeof(CommonMethod).Name, iParameter.GetType().Name, iParameter);

        }

        /// <summary>

        /// 印出DateTime數值

        /// </summary>

        /// <param name="iParameter"></param>

        public static void ShowDateTime(DateTime iParameter)

        {

            Console.WriteLine("This is {0},parameter={1},type={2}",

                typeof(CommonMethod).Name, iParameter.GetType().Name, iParameter);

        }

    }

static void Main(string[] args)

        {

            int iValue = 123;

            string sValue = "123";

            DateTime dtValue = DateTime.Now;

            CommonMethod.ShowInt(iValue);

            CommonMethod.ShowString(sValue);

            CommonMethod.ShowDateTime(dtValue);

        }

如何定義和使用泛型

public class GenericMethod 

{

	public static void Show<myName>(myName tParameter) 

	{

		Console.WriteLine("This is {0},parameter={1},type={2}",

		typeof(GenericMethod),tParameter.GetType().Name,tParameter.ToString());

	}

}

void Main()

{

	try

	{

		int iValue = 123;

		string sValue = "456";

		DateTime dtValue = DateTime.Now;

		GenericMethod.Show<int>(iValue);

		GenericMethod.Show<string>(sValue);

		GenericMethod.Show<DateTime>(dtValue);

	}

	catch (Exception ex)

	{

		Console.WriteLine(ex.Message);

	}

}

• 2.0時代推出的
• 把參數型別的定義延遲到使用的時候
• 不是語法糖，而是2.0由框架升級堤供的功能
• TypeName命名:不要用關鍵字 也不要跟類型衝突

參考資料