CRM动态插件更新不工作

我有一个CRM Dynamics插件，在布尔值更改的更新上触发，当我在两个选项控件上选择是时，它无法触发，请在下面找到我的代码并建议我可能出错的地方。

namespace WebCall.Plugin
{
  public class WebCallTrigger : IPlugin
  {
    /// <summary>
    /// Plugin to initiate a web call from CRM using MaruSip API
    /// </summary>
    /// <param name="serviceProvider"></param>
    public void Execute(IServiceProvider serviceProvider)
    {
        IPluginExecutionContext context = (IPluginExecutionContext)serviceProvider.GetService(typeof(IPluginExecutionContext));
        if (context == null)
        {
            throw new ArgumentNullException("localContext");
        }
        IOrganizationServiceFactory serviceFactory = (IOrganizationServiceFactory)serviceProvider.GetService(typeof(IOrganizationServiceFactory));
        IOrganizationService service = serviceFactory.CreateOrganizationService(context.InitiatingUserId);
        if (context.InputParameters.Contains("Target") && context.InputParameters["Target"] is Entity)
        {
            //initaialize Entity
            Entity phoneCallEntity = (Entity)context.InputParameters["Target"];
            if (phoneCallEntity.LogicalName != Contact.EntityLogicalName)
                return;
            //ensure that the Plugin fires on a create operaton
            if (context.MessageName == "Update")
            {
                try
                {
                    if (phoneCallEntity.Attributes.Contains("new_dialnumber"))
                        phoneCallEntity["new_dialnumber"] = true;
                    string NumberToCall;                // = phoneCallEntity.Contains("telephone1") ? phoneCallEntity["telephone1"].ToString() : null;
                    if (phoneCallEntity.Contains("telephone1"))
                    {
                        NumberToCall = phoneCallEntity.Attributes["telephone1"].ToString();
                    }
                    else
                    {
                        NumberToCall = phoneCallEntity.Attributes["mobilephone"].ToString();
                    }
                    string ReceiveCallOn = phoneCallEntity.Contains("new_receivecallon") ? phoneCallEntity["new_receivecallon"].ToString() : null;
                    string apiKey = phoneCallEntity.Attributes.Contains("new_apikey") ? phoneCallEntity.Attributes["new_apikey"].ToString() : null;
                    int fId = phoneCallEntity.Attributes.Contains("new_fid") ? (int)phoneCallEntity.Attributes["new_fid"] : 0;
                    //service.Update(phoneCallEntity);
                    //Create a new instance of the WebCallService and call the webcall method
                    WebCallService webCallService = new WebCallService();
                    webCallService.WebCall(NumberToCall, ReceiveCallOn, apiKey, fId);
                }