{C#}流畅方法.接口

背景

• 使用流畅方法后，能像lambda一样调用，是不是很神奇？
• 诀窍：返回类型=容器类型

示例

using static System.Console;

namespace FluentInterface
{
    public interface IReporter
    {
        IReporter CreateHeader(); // 流畅方法=返回容器，下同
        IReporter CreateBody();
        IReporter CreateFooter();
    }

    public class Reporter : IReporter
    {
        public string Content { get; private set; } = "";

        public Reporter() { }

        public IReporter CreateHeader()
        {
            Content += "This is header.";
            return this;
        }

        public IReporter CreateBody()
        {
            Content += "\nThis is body.";
            return this;
        }

        public IReporter CreateFooter()
        {
            Content += "\nThis is footer.";
            return this;
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            var report = new Reporter();
            report.CreateHeader()
                .CreateBody()
                .CreateFooter();

            WriteLine(report.Content);
            ReadKey();
        }
    }
}