WebService开发 使用Soap

??????平时写Web Service时经常会对Service的访问进行安全控制，方法很多，这里介绍一下如何用Soap头来进行控制的一例。
??????第一步，引用需要用到的名称空间

using?System;

using?System.Xml;

using?System.Xml.Serialization;

using?System.Web.Services;

using?System.Web.Services.Protocols;

??????
??????第二步，建立自定义的SoapHeader类MySoapHeader

public?class?MySoapHeader?:?SoapHeader

{

????string?_name;

????string?_passWord;

????public?string?Name

????{

????????get?{?return?_name;?}

????????set?{?_name?=?value;?}

????}

????public?string?PassWord

????{

????????get?{?return?_passWord;?}

????????set?{?_passWord?=?value;?}

????}

}

??????第三步，建立WebSerivce，MyService类有一个MySoapHeader类型的字段公共header,在客户调用CheckHeader之前需要给header付一个新实例，服务器端检验这个实例的成员信息。失败我们抛出一个SoapHeaderException，这个异常的新实例，这里调用两个参数的构造函数。第一个参数是自定义的异常原因，第二个参数我们用SoapException.ClientFaultCode表示客户的调用格式不正确或缺少必要的信息。

[WebService(Namespace?=?"http://DavidFan.cnblogs.com")]

public?class?MyService?:?System.Web.Services.WebService

{

????public?MySoapHeader?header;

????[SoapHeader("header",?Direction?=?SoapHeaderDirection.In)]

????public?string?CheckHeader()

????{

????????if?(header?==?null)

????????{

????????????throw?new?SoapHeaderException("认证失败",?SoapException.ClientFaultCode);

????????}

????????else

????????{

????????????if?(header.Name?!=?"admin"?||?header.PassWord?!=?"admin")

????????????{

????????????????throw?new?SoapHeaderException("认证失败",?SoapException.ClientFaultCode);

????????????}

????????}

????????//业务逻辑

.

????????return?"Something?done";

????}

}

??????第四步，客户端进行调用,这里的MySoapHeader，和MyService类即为WSDL工具生成代理类,对应服务端的上两个类。我们首先new 一个MySoapHeader的新实例,然后付个Myservice的新实例的header字段,最后调用CheckHeader这个服务器的方法，CheckHeader方法的header!=null，接着进行Name和PassWord的验证。
客户端try-catch块内首先捕获SoapHeaderException(如果有的话)。然后捕获Exception。好了整个过程只需这几步。

public?class?ServiceClient

{

????protected?void?ClientMethod(string?name,?string?passWord)

????{

????????MySoapHeader?h?=?new?MySoapHeader();

????????h.Name?=?name;

????????h.PassWord?=?passWord;

????????MyService?service?=?new?MyService();

????????service.header?=?h;

????????try

????????{

????????????string?retval?=?service.CheckHeader();

????????????Console.WriteLine("Return:"?+?retval);

????????}

????????catch?(SoapHeaderException?soapEx)

????????{

????????????Console.WriteLine("Soap?Header?Exception:"?+?soapEx.Message);

????????}

????????catch?(Exception?ex)

????????{

????????????Console.WriteLine("Exception:"?+?ex.Message);

????????}

????}

}

??????到些为止,利用Soap头的一例简单的介绍完了，扩展应用，就由大家来发挥吧！
??????下一篇，会介绍一下Soap扩展！谢谢大家！