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作法：控制服務執行個體

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設定服務的執行個體模式，可讓您指定 System.ServiceModel.InstanceContext (及其相關之使用者定義的服務物件) 建立的時機。 如需可能的模式，請參閱 InstanceContextMode 列舉。 如需行為的詳細資訊，請參閱使用行為設定和擴充執行時間。 如需工作範例，請參閱行為。

使用程式碼控制服務執行個體存留期

  1. 將 ServiceBehaviorAttribute 套用至服務類別。

  2. 將 InstanceContextMode 屬性設定為下列其中一值：PerCall、PerSession 或 Single。

    [ServiceBehaviorAttribute(InstanceContextMode = InstanceContextMode.PerCall)]

    <ServiceBehaviorAttribute(InstanceContextMode:=InstanceContextMode.PerCall)> _
Public Class CalculatorService

範例

下列程式碼範例會將 InstanceContextMode 屬性 (Attribute) 的 ServiceBehaviorAttribute 屬性 (Property) 設定為 PerCall。

// 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);
}

// Service class which implements the service contract.
[ServiceBehaviorAttribute(InstanceContextMode = InstanceContextMode.PerCall)]
public class CalculatorService : ICalculator
{
    public double Add(double n1, double n2)
    {
        return n1 + n2;
    }

    public double Subtract(double n1, double n2)
    {
        return n1 - n2;
    }

    public double Multiply(double n1, double n2)
    {
        return n1 * n2;
    }

    public double Divide(double n1, double n2)
    {
        return n1 / n2;
    }
}

' 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

' Service class which implements the service contract.
<ServiceBehaviorAttribute(InstanceContextMode:=InstanceContextMode.PerCall)> _
Public Class CalculatorService
    Implements ICalculator

    Public Function Add(ByVal n1 As Double, ByVal n2 As Double) As Double _
    Implements ICalculator.Add
        Return n1 + n2

    End Function


    Public Function Subtract(ByVal n1 As Double, ByVal n2 As Double) As Double _
    Implements ICalculator.Subtract
        Return n1 - n2
    End Function

    Public Function Multiply(ByVal n1 As Double, ByVal n2 As Double) As Double _
    Implements ICalculator.Multiply
        Return n1 * n2
    End Function

    Public Function Divide(ByVal n1 As Double, ByVal n2 As Double) As Double _
    Implements ICalculator.Divide
        Return n1 / n2
    End Function
End Class

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