如何：实现 Windows Communication Foundation 服务协定

项目
02/28/2011

这是创建基本 Windows Communication Foundation (WCF) 服务和可以调用该服务的客户端所需的六项任务中的第二项任务。有关全部六项任务的概述，请参见入门教程主题。

创建 WCF 服务要求首先创建使用接口定义的协定。有关创建该接口的更多信息，请参见如何：定义 Windows Communication Foundation 服务协定。本示例中显示的下一步骤是实现接口。这涉及到创建一个名为 CalculatorService 的类，该类实现用户定义的 ICalculator 接口。在操作过程后面的示例中提供了用于此任务的代码。

实现 WCF 服务协定

在定义了 ICalculator 接口的同一文件中创建一个名为 CalculatorService 的新类。CalculatorService 实现 ICalculator 接口。
```
Public Class CalculatorService
    Implements ICalculator
```
```
public class CalculatorService : ICalculator
```

在 CalculatorService 类中实现在 ICalculator 接口中定义的每个方法。

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

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;
}

注意：
已经添加写入输出代码以方便测试。

示例

下面的代码示例演示定义协定的接口和接口的实现。

Imports System
Imports System.ServiceModel


Namespace Microsoft.ServiceModel.Samples
    ' Define a service contract.
    <ServiceContract([Namespace] := "http://Microsoft.ServiceModel.Samples")>  _
    Public Interface ICalculator
        <OperationContract()>  _
        Function Add(ByVal n1 As Double, ByVal n2 As Double) As Double 
        <OperationContract()>  _
        Function Subtract(ByVal n1 As Double, ByVal n2 As Double) As Double 
        <OperationContract()>  _
        Function Multiply(ByVal n1 As Double, ByVal n2 As Double) As Double 
        <OperationContract()>  _
        Function Divide(ByVal n1 As Double, ByVal n2 As Double) As Double 
    End Interface
    
    ' Step 1: Create service class that implements the service contract.
    Public Class CalculatorService
        Implements ICalculator
        
        ' Step 2: Implement functionality for the service operations.
        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

using System;
using System.ServiceModel;

namespace Microsoft.ServiceModel.Samples
{
    // Define a service contract.
    [ServiceContract(Namespace = "http://Microsoft.ServiceModel.Samples")]
    public interface ICalculator
    {
        [OperationContract]
        double Add(double n1, double n2);
        [OperationContract]
        double Subtract(double n1, double n2);
        [OperationContract]
        double Multiply(double n1, double n2);
        [OperationContract]
        double Divide(double n1, double n2);
    }

    // Step 1: Create service class that implements the service contract.
    public class CalculatorService : ICalculator
    {
         // Step 2: Implement functionality for the service operations.
        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;
        }
    }
}

现在已创建并实现了服务协定。生成该解决方案以确保不存在编译错误，然后按照如何：承载和运行基本的 Windows Communication Foundation 服务中的说明运行服务。有关疑难解答信息，请参见入门教程疑难解答。

编译代码

如果使用的是命令行编译器，则必须引用 System.ServiceModel 程序集。

如果使用的是 Visual Studio，请在“生成”菜单上单击“生成解决方案”（或按 Ctrl+Shift+B）。

另请参见

任务

入门示例
 自承载

通过

如何：实现 Windows Communication Foundation 服务协定

实现 WCF 服务协定

示例

编译代码

另请参见

任务

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