教程：实现 Windows Communication Foundation 服务协定

本教程介绍创建基本 Windows Communication Foundation (WCF) 应用程序所要完成的五个任务中的第二个任务。 有关教程概述，请参阅教程：Windows Communication Foundation 应用程序入门。

创建 WCF 应用程序的下一步是添加代码，以实现在上一步中创建的 WCF 服务接口。 在此步骤中，将创建名为 CalculatorService 的类，用于实现用户定义的 ICalculator 接口。 以下代码中的每个方法都将调用计算器操作，并将文本写入到控制台进行测试。

本教程介绍如何执行下列操作：

• 添加代码以实现 WCF 服务协定。
• 生成解决方案。

添加代码以实现 WCF 服务协定

打开 GettingStartedLib 中的 Service1.cs 或 Service1.vb 文件，并将其代码替换为以下代码：

using System;
using System.ServiceModel;

namespace GettingStartedLib
{
    public class CalculatorService : ICalculator
    {
        public double Add(double n1, double n2)
        {
            double result = n1 + n2;
            Console.WriteLine("Received Add({0},{1})", n1, n2);
            // Code added to write output to the console window.
            Console.WriteLine("Return: {0}", result);
            return result;
        }

        public double Subtract(double n1, double n2)
        {
            double result = n1 - n2;
            Console.WriteLine("Received Subtract({0},{1})", n1, n2);
            Console.WriteLine("Return: {0}", result);
            return result;
        }

        public double Multiply(double n1, double n2)
        {
            double result = n1 * n2;
            Console.WriteLine("Received Multiply({0},{1})", n1, n2);
            Console.WriteLine("Return: {0}", result);
            return result;
        }

        public double Divide(double n1, double n2)
        {
            double result = n1 / n2;
            Console.WriteLine("Received Divide({0},{1})", n1, n2);
            Console.WriteLine("Return: {0}", result);
            return result;
        }
    }
}

Imports System.ServiceModel

Namespace GettingStartedLib

    Public Class CalculatorService
        Implements ICalculator

        Public Function Add(ByVal n1 As Double, ByVal n2 As Double) As Double Implements ICalculator.Add
            Dim result As Double = n1 + n2
            ' Code added to write output to the console window.
            Console.WriteLine("Received Add({0},{1})", n1, n2)
            Console.WriteLine("Return: {0}", result)
            Return result
        End Function

        Public Function Subtract(ByVal n1 As Double, ByVal n2 As Double) As Double Implements ICalculator.Subtract
            Dim result As Double = n1 - n2
            Console.WriteLine("Received Subtract({0},{1})", n1, n2)
            Console.WriteLine("Return: {0}", result)
            Return result

        End Function

        Public Function Multiply(ByVal n1 As Double, ByVal n2 As Double) As Double Implements ICalculator.Multiply
            Dim result As Double = n1 * n2
            Console.WriteLine("Received Multiply({0},{1})", n1, n2)
            Console.WriteLine("Return: {0}", result)
            Return result

        End Function

        Public Function Divide(ByVal n1 As Double, ByVal n2 As Double) As Double Implements ICalculator.Divide
            Dim result As Double = n1 / n2
            Console.WriteLine("Received Divide({0},{1})", n1, n2)
            Console.WriteLine("Return: {0}", result)
            Return result

        End Function
    End Class
End Namespace

编辑 App.config

编辑 GettingStartedLib 中的 App.config，以体现你对代码进行的更改。

• 对于 Visual C# 项目：

  • 将第 14 行更改为 <service name="GettingStartedLib.CalculatorService">
  • 将第 17 行更改为 <add baseAddress = "http://localhost:8000/GettingStarted/CalculatorService" />
  • 将第 22 行更改为 <endpoint address="" binding="wsHttpBinding" contract="GettingStartedLib.ICalculator">

• 对于 Visual Basic 项目：

  • 将第 14 行更改为 <service name="GettingStartedLib.GettingStartedLib.CalculatorService">
  • 将第 17 行更改为 <add baseAddress = "http://localhost:8000/GettingStarted/CalculatorService" />
  • 将第 22 行更改为 <endpoint address="" binding="wsHttpBinding" contract="GettingStartedLib.GettingStartedLib.ICalculator">

编译代码

生成解决方案，以验证是否没有任何编译错误。 如果使用的是 Visual Studio，请在“生成”菜单上选择“生成解决方案”（或按 Ctrl+Shift+B）。

后续步骤

在本教程中，你了解了如何执行以下操作：

• 添加代码以实现 WCF 服务协定。
• 生成解决方案。

请继续阅读下一篇教程，了解如何运行 WCF 服务。

教程：托管和运行基本 WCF 服务