c# – 在调用ASMX Web服务时维护会话

public class TestService : System.Web.Services.WebService
{
    [WebMethod(EnableSession = true)]
    public string WelcomeMsg()
    {
        return "Hello: " + Session["UserName"] + "! Welcome to our store.";
    }

    [WebMethod(EnableSession = true)]
    public void SetUserName(string sName)
    {
        Session["UserName"] = sName;
    }
}

这是我在客户端应用程序上的代码(Windows窗体,而不是Web基础)：

private void btnSetName_Click(object sender,EventArgs e)
{
    TestService.TestService ws = new TestService.TestService(); //Create a web service
    MainForm.m_ccSessionInfo = new System.Net.CookieContainer(); //Create a CookieContainer
    ws.CookieContainer = MainForm.m_ccSessionInfo; //Set CookieContainer of the web service
    ws.SetUserName(txtUserName.Text); //Set value of session 
    ws = null;
}

private void btnWelcome_Click(object sender,EventArgs e)
{
    TestService.TestService ws = new TestService.TestService(); //Create a web service
    ws.CookieContainer = MainForm.m_ccSessionInfo; //Set CookieContainer back
    string sWelcome = ws.WelcomeMsg(); //Get value from session property
    ws = null;

    System.Diagnostics.Debug.WriteLine(sWelcome); 
}

在我的示例中,MainForm.m_ccSessionInfo是一个静态成员,我想在此会话中保留会话cookie值！
但是,它不起作用:(.ws.WelcomeMsg()总是返回一个空字符串.