通过SoapException捕获Webservice异常

这两天在研究Silverlight端如何捕获webService远程抛出的异常，没有太大进展，希望有了解的人能给我留言。以下是非silverlight的一般程序捕获webService端异常的做法：

1.在webservice端将抛出的一般异常封装成soapException

在这里，我们知道webService传递数据的方法是以xml格式的，故其异常也存在于xml文档中

public enum FaultCode        {            Client = 0,            Server = 1        }

        /// <summary>        /// 封装异常为SoapException        /// </summary>        /// <param name="uri">引发异常的方法uri</param>        /// <param name="errorMessage">错误信息</param>        /// <param name="errorNumber">错误号</param>        /// <param name="errorSource">错误源</param>        /// <param name="code">异常类型</param>        /// <returns>封装后的SoapException</returns>        public SoapException RaiseException(                                                string uri,                                                string errorMessage,                                                string errorNumber,                                                string errorSource,                                                FaultCode code                                            )        {            //初始化限定名            XmlQualifiedName faultCodeLocation = null;

            //异常类型代码转换            switch (code)            {                case FaultCode.Client:                    faultCodeLocation = SoapException.ClientFaultCode;                    break;                case FaultCode.Server:                    faultCodeLocation = SoapException.ServerFaultCode;                    break;            }

            //构建异常信息结构体            string strXmlOut = @"<detail>"                             + "<Error>"                             + "<ErrorNumber>" + errorNumber + "</ErrorNumber>"                             + "<ErrorMessage>" + errorMessage + "</ErrorMessage>"                             + "<ErrorSource>" + errorSource + "</ErrorSource>"                             + "</Error>"                             + "</detail>";

            //装载为Xml文档            XmlDocument xmlDoc = new XmlDocument();            xmlDoc.LoadXml(strXmlOut);

            //实例化SoapException            SoapException soapEx = new SoapException(errorMessage, faultCodeLocation, uri, xmlDoc.DocumentElement);

            //返回SoapException            return soapEx;        }

2. 在webMethod内调用该封装方法，

        [WebMethod]        public string HelloWorld()        {            try            {                throw new Exception("webService error");                return "HelloWorld";

            }            catch (System.Exception ex)            {                throw RaiseException(                                        "WSReadPersonByID",                                        ex.Message,                                        "1000",                                        ex.Source,                                        FaultCode.Server                                    );            }        }

3.在客户端获得异常XML并解析

public class SoapExceptionInfo    {        /// <summary>        /// 错误号        /// </summary>        public string ErrorNumber = string.Empty;        /// <summary>        /// 错误信息        /// </summary>        public string ErrorMessage = string.Empty;        /// <summary>        /// 错误源        /// </summary>        public string ErrorSource = string.Empty;

        /// <summary>        /// SoapExceptionInfo构造方法        /// </summary>        public SoapExceptionInfo()        {

        }

        /// <summary>        /// SoapExceptionInfo构造方法        /// </summary>        /// <param name="soapEx">SoapException</param>        public SoapExceptionInfo(SoapException soapEx)        {            XmlDocument doc = new XmlDocument();            doc.LoadXml(soapEx.Detail.OuterXml);            XmlNode categoryNode = doc.DocumentElement.SelectSingleNode("Error");

            this.ErrorNumber = categoryNode.SelectSingleNode("ErrorNumber").InnerText;            this.ErrorMessage = categoryNode.SelectSingleNode("ErrorMessage").InnerText;            this.ErrorSource = categoryNode.SelectSingleNode("ErrorSource").InnerText;        }    }

4.在客户端捕获异常

public Form1()        {            InitializeComponent();            ServiceReference1.Service1SoapClient t = new wfTest.ServiceReference1.Service1SoapClient();            try            {                label1.Text = t.HelloWorld();            }            catch (SoapException ex)            {                SoapExceptionInfo s = new SoapExceptionInfo(ex);                                label1.Text = s.ErrorMessage;                //label1.Text = ex.Message;            }            catch(Exception e)            {                label1.Text = e.Message;            }        }