MessageParameterAttribute 类

定义

public ref class MessageParameterAttribute sealed : Attribute

[System.AttributeUsage(System.AttributeTargets.Parameter | System.AttributeTargets.ReturnValue, Inherited=false)]
public sealed class MessageParameterAttribute : Attribute

[<System.AttributeUsage(System.AttributeTargets.Parameter | System.AttributeTargets.ReturnValue, Inherited=false)>]
type MessageParameterAttribute = class
    inherit Attribute

Public NotInheritable Class MessageParameterAttribute
Inherits Attribute

继承

Object

Attribute

MessageParameterAttribute

属性

AttributeUsageAttribute

示例

下面的代码示例演示如何使用 MessageParameterAttribute 在元数据中建立参数和返回值的名称。

using System;
using System.Collections.Generic;
using System.ServiceModel;
using System.Text;

namespace Microsoft.WCF.Documentation
{
  [ServiceContract(Namespace="http://microsoft.wcf.documentation")]
  public interface ISampleService{
    [OperationContract]
    [return:MessageParameter(Name = "Output")]
    string SampleMethod([MessageParameter(Name = "Input")]string msg);
  }

  /*
   The preceding use of MessageParameterAttribute generates the following XSD:

<?xml version="1.0" encoding="utf-8" ?>
  <xs:schema
    elementFormDefault="qualified"
    targetNamespace="http://microsoft.wcf.documentation"
    xmlns:xs="http://www.w3.org/2001/XMLSchema"
    xmlns:tns="http://microsoft.wcf.documentation">
    <xs:element name="SampleMethod">
      <xs:complexType>
        <xs:sequence>
          <xs:element minOccurs="0" name="Input" nillable="true" type="xs:string" />
        </xs:sequence>
      </xs:complexType>
    </xs:element>
    <xs:element name="SampleMethodResponse">
      <xs:complexType>
        <xs:sequence>
          <xs:element minOccurs="0" name="Output" nillable="true" type="xs:string" />
        </xs:sequence>
      </xs:complexType>
    </xs:element>
  </xs:schema>

   And the message sent is edited for clarity:
  <s:Body>
    <SampleMethod xmlns="http://microsoft.wcf.documentation">
      <Input>hello!</Input>
    </SampleMethod>
  </s:Body>
   */

Imports System.ServiceModel
Imports System.Text

Namespace Microsoft.WCF.Documentation
  <ServiceContract(Namespace:="http://microsoft.wcf.documentation")> _
  Public Interface ISampleService
    <OperationContract> _
    Function SampleMethod(<MessageParameter(Name := "Input")> ByVal msg As String) As <MessageParameter(Name := "Output")> String
  End Interface

'  
'   The preceding use of MessageParameterAttribute generates the following XSD:
'
'<?xml version="1.0" encoding="utf-8" ?> 
'  <xs:schema 
'    elementFormDefault="qualified" 
'    targetNamespace="http://microsoft.wcf.documentation" 
'    xmlns:xs="http://www.w3.org/2001/XMLSchema" 
'    xmlns:tns="http://microsoft.wcf.documentation">
'    <xs:element name="SampleMethod">
'      <xs:complexType>
'        <xs:sequence>
'          <xs:element minOccurs="0" name="Input" nillable="true" type="xs:string" /> 
'        </xs:sequence>
'      </xs:complexType>
'    </xs:element>
'    <xs:element name="SampleMethodResponse">
'      <xs:complexType>
'        <xs:sequence>
'          <xs:element minOccurs="0" name="Output" nillable="true" type="xs:string" /> 
'        </xs:sequence>
'      </xs:complexType>
'    </xs:element>
'  </xs:schema>
'   
'   And the message sent is edited for clarity:
'  <s:Body>
'    <SampleMethod xmlns="http://microsoft.wcf.documentation">
'      <Input>hello!</Input>
'  </s:Body>   
'

下面的示例显示上述服务的已生成服务协定。 请注意参数的名称现在为 Input。

[System.CodeDom.Compiler.GeneratedCodeAttribute("System.ServiceModel", "3.0.0.0")]
[System.ServiceModel.ServiceContractAttribute(Namespace="http://microsoft.wcf.documentation", ConfigurationName="ISampleService")]
public interface ISampleService
{

    [System.ServiceModel.OperationContractAttribute(
      Action="http://microsoft.wcf.documentation/ISampleService/SampleMethod",
      ReplyAction="http://microsoft.wcf.documentation/ISampleService/SampleMethodResponse"
    )]
    [return: System.ServiceModel.MessageParameterAttribute(Name="Output")]
    string SampleMethod(string Input);
}

<System.CodeDom.Compiler.GeneratedCodeAttribute("System.ServiceModel", "3.0.0.0"), _
System.ServiceModel.ServiceContractAttribute(Namespace:="http://microsoft.wcf.documentation", _
                                             ConfigurationName:="ISampleService")> _
Public Interface ISampleService

    <System.ServiceModel.OperationContractAttribute(Action:="http://microsoft.wcf.documentation/ISampleService/SampleMethod", _
                    ReplyAction:="http://microsoft.wcf.documentation/ISampleService/SampleMethodResponse")> _
    Function SampleMethod(ByVal Input As String) As <System.ServiceModel.MessageParameterAttribute(Name:="Output")> String
End Interface

注解

使用 MessageParameterAttribute 可以控制参数或返回值的名称。 此属性对于已用 MessageContractAttribute 属性标记的参数无效。

有关在不修改默认 SOAP 信封本身的情况下控制 SOAP 正文内容的序列化的详细信息，请参阅 System.Runtime.Serialization.DataContractAttribute、 在服务协定中指定数据传输和使用 数据协定。

有关创建消息协定的详细信息，请参阅 使用消息协定。