Project Server SDK SoapException

Question

尝试使用Project Server SDK开发webpart。但是当我调用PSI方法时，无论采用哪种方法，都会出现异常。例如，当我运行以下代码时

using System;
using System.Web.UI;
using System.Web.Services.Protocols;
using System.Net;

namespace ProjectServerWebPart.PSWebPart
{
    public partial class PSWebPartUserControl : UserControl
    {
        private ProjectWebSvc.Project project = new ProjectWebSvc.Project();
        private ProjectWebSvc.ProjectDataSet projectList;

        private string webApp = "http://portal/projeler/";
        private string projectPath = "_vti_bin/PSI/Project.asmx";

        private string username = "Administrator";
        private string password = "***";
        private string domain = "HES";

        protected void Page_Load(object sender, EventArgs e)
        {
            project.Url = webApp + projectPath;
            project.Credentials = new NetworkCredential(username, password, domain);

            // This is where the exception is thrown
            projectList = project.ReadProjectList();
        }
    }
}

在事件查看器的“应用程序”选项卡中，我们有

Event code: 3005 
Event message: An unhandled exception has occurred. 
Event time: 08.08.2012 11:19:37 
Event time (UTC): 08.08.2012 08:19:37 
Event ID: 5a53deb9f869489f985280392be91882 
Event sequence: 39 
Event occurrence: 1 
Event detail code: 0 

Application information: 
    Application domain: /LM/W3SVC/8719922/ROOT-3-129888875537314012 
    Trust level: Full 
    Application Virtual Path: / 
    Application Path: C:\inetpub\wwwroot\wss\VirtualDirectories\80\ 
    Machine name: PORTAL 

Process information: 
    Process ID: 10360 
    Process name: w3wp.exe 
    Account name: HES\spadmin 

Exception information: 
    Exception type: SoapException 
    Exception message: Unhandled Communication Fault occurred 

Request information: 
    Request URL: http://portal/koseus/SitePages/Giriş Sayfası.aspx 
    Request path: /koseus/SitePages/Giriş Sayfası.aspx 
    User host address: fe80::642c:2aa1:4852:3359Full 
    User: HES\Administrator 
    Is authenticated: True 
    Authentication Type: NTLM 
    Thread account name: HES\spadmin 

Thread information: 
    Thread ID: 10 
    Thread account name: HES\spadmin 
    Is impersonating: False 
    Stack trace:    at System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse(SoapClientMessage message, WebResponse response, Stream responseStream, Boolean asyncCall)
at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters)
at ProjectServerWebPart.ProjectWebSvc.Project.ReadProjectList()
at ProjectServerWebPart.PSWebPart.PSWebPartUserControl.Page_Load(Object sender, EventArgs e)
at System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e)
at System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e)
at System.Web.UI.Control.OnLoad(EventArgs e)
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Control.AddedControl(Control control, Int32 index)
at ProjectServerWebPart.PSWebPart.PSWebPart.CreateChildControls()
at System.Web.UI.Control.EnsureChildControls()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

期待得到一些支持。提前谢谢。