HOW TO：實作 Windows Communication Foundation 服務合約

發行項
02/28/2011

這是在建立基本 Windows Communication Foundation (WCF) 服務及可以呼叫該服務的用戶端時，必須進行的六個工作中的第二個。如需這六個工作的概觀，請參閱使用者入門教學課程主題。

建立 WCF 服務時，首先您需要建立將透過介面來定義的合約。如需詳細資訊建立介面的詳細資訊，請參閱 HOW TO：定義 Windows Communication Foundation 服務合約。下一步就是實作介面，如本範例所示。其中包含建立名稱為 CalculatorService 的類別，該類別會實作使用者定義的 ICalculator 介面。用於這項工作的程式碼將於本程序之後的範例中提供。

實作 WCF 服務合約

在您定義 ICalculator 介面所在的檔案中，建立稱為 CalculatorService 的新類別。 CalculatorService 會實作 ICalculator 介面。
```
Public Class CalculatorService
    Implements ICalculator
```
```
public class CalculatorService : ICalculator
```

實作 CalculatorService 類別內 ICalculator 介面中已定義的每個方法。

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：
已新增撰寫輸出程式碼，以便於測試。

範例

下列程式碼範例同時說明可定義合約的介面，以及介面的實作。

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;
        }
    }
}

現在，服務合約已建立且已實作。建置方案以確認沒有任何編譯錯誤，然後繼續進行 HOW TO：裝載和執行基本 Windows Communication Foundation 服務執行服務。如需疑難排解的詳細資訊，請參閱使用者入門教學課程疑難排解。

編譯程式碼

如果您是使用命令列編譯器，必須參考 System.ServiceModel 組件。

如果您使用的是 Visual Studio，請按一下 [建置] 功能表上的 [建置方案] (或按 CTRL+SHIFT+B)。

另請參閱

工作

使用者入門範例
 自我裝載

共用方式為

HOW TO：實作 Windows Communication Foundation 服務合約

實作 WCF 服務合約

範例

編譯程式碼

另請參閱

工作

其他資源