crm2011針對商機實體的插件問題

Question

我創建了crm2011插件，針對商機更新消息（Pre_operation）。在插件中，我使用電子郵件模板並使用電子郵件模板發送電子郵件。當我運行時，雖然模板ID是正確的，但插件無法發送帶有電子郵件模板的電子郵件。我收到此錯誤消息「對象引用未設置爲對象的實例」。請幫我...這裏是我的插件代碼..

namespace Ppp.CRM.Plugin.OpptBidOwnerChange 
{ 
public class BidOwnerChange : IPlugin 
{ 
    #region Class Level Variables 
    IServiceProvider _serviceProvider; 
    IOrganizationServiceFactory _serviceFactory = null; 
    IOrganizationService _service = null; 
    IPluginExecutionContext _context = null; 

    Entity _target = null; 
    Entity _preImage = null; 
    Entity _postImage = null; 
    Guid _currentUser; 
    Guid pre_bidownerid = Guid.Empty; 
    Guid tag_bidownerid = Guid.Empty; 
    Guid ownerid = Guid.Empty; 
    Guid opportunityid = Guid.Empty; 
    #endregion 

    #region IPlugin Members 
    public void Execute(IServiceProvider serviceProvider) 
    { 
     try 
     { 
      string message = null; 
      _serviceProvider = serviceProvider; 
      _context = (IPluginExecutionContext) 
             serviceProvider.GetService(typeof(IPluginExecutionContext)); 

      _serviceFactory = (IOrganizationServiceFactory)serviceProvider.GetService(typeof(IOrganizationServiceFactory)); 
      _currentUser = _context.UserId; 
      message = _context.MessageName.ToLower(); 

      if (message == "update")//message == "create" || 
      { 
       if (_context.InputParameters.Contains("Target") && _context.InputParameters["Target"] != null) 
        _target = (Entity)_context.InputParameters["Target"]; 

       if (_context.PreEntityImages.Contains("PreImage") && _context.PreEntityImages["PreImage"] != null) 
        _preImage = (Entity)_context.PreEntityImages["PreImage"]; 

       if (_context.PostEntityImages.Contains("PostImage") && _context.PostEntityImages["PostImage"] != null) 
        _postImage = (Entity)_context.PostEntityImages["PostImage"]; 


       if (_preImage.Attributes.Contains("hm_bidowner")) 
       { 
        EntityReference owner = (EntityReference)_preImage.Attributes["hm_bidowner"]; 
        pre_bidownerid = owner.Id; 
        _target.Attributes["hm_previousbidowner"] = new EntityReference("systemuser", owner.Id); 
       } 
       if (_target.Attributes.Contains("hm_bidowner")) 
       { 
        EntityReference owner = (EntityReference)_target.Attributes["hm_bidowner"]; 
        tag_bidownerid = owner.Id; 
       } 
       if (_preImage.Attributes.Contains("ownerid")) 
       { 
        EntityReference owner = (EntityReference)_preImage.Attributes["ownerid"]; 
        ownerid = owner.Id; 
       } 

       opportunityid = _target.Id; 

       ActivityParty emailFrom = new ActivityParty { PartyId = new EntityReference("systemuser", _context.UserId) }; 
       List<ActivityParty> emailTo = new List<ActivityParty>(); 

       // alert user 
       if (_preImage.Attributes.Contains("ownerid")) 
       { 
        emailTo.Add(new ActivityParty { PartyId = new EntityReference("systemuser", ownerid) }); 
       } 
       if (_preImage.Attributes.Contains("hm_bidowner")) 
       { 
        emailTo.Add(new ActivityParty { PartyId = new EntityReference("systemuser", pre_bidownerid) }); 
       } 
       if (_target.Attributes.Contains("hm_bidowner")) 
       { 
        //emailTo.Add(new ActivityParty { PartyId = ((EntityReference)_target["hm_bidowner"]) }); 
        emailTo.Add(new ActivityParty { PartyId = new EntityReference("systemuser", tag_bidownerid) }); 
       } 

       Email email = new Email(); 
       email.From = new ActivityParty[] { emailFrom }; ; 
       if (emailTo.Count() > 0) 
        email.To = emailTo; 

       Guid templateId = Guid.Empty; 
       templateId = new Guid("EC361CDE-6C9E-E111-BF90-D8D3855BE525");//ACE17A0C-279B-E111-9E28-080027332B48 

       SendEmailFromTemplateRequest emailUsingTemplateReq = new SendEmailFromTemplateRequest 
       { 
        Target = email, 
        TemplateId = templateId, 
        RegardingId = opportunityid, 
        RegardingType = Opportunity.EntityLogicalName 
       }; 


       SendEmailFromTemplateResponse emailUsingTemplateResp = (SendEmailFromTemplateResponse)_service.Execute(emailUsingTemplateReq); 

      } 
     } 
     catch (Exception ex) 
     { 
      throw new InvalidPluginExecutionException(ex.Message, ex); 
     } 
    } 
    #endregion 

    #region CRM Service 
    private void CreateCRMService() 
    { 
     try 
     { 
      _service = _serviceFactory.CreateOrganizationService(_currentUser); 
     } 
     catch (Exception ex) 
     { 
      throw ex; 
     } 
    } 
    #endregion 

} 

}從代碼

Answer 1

SendEmailFromTemplateResponse emailUsingTemplateResp = (SendEmailFromTemplateResponse)_service.Execute(emailUsingTemplateReq); 

_service vlaue仍然空。
這意味着您沒有重新初始化該值。

請參閱這些鏈接

1. Using CRM 2011 Service to Create Record from Code
2. CRM 2011 SecurityNegotiationException trying to access web services
3. Issue with mocking IOrganizationService.Execute in CRM 2011 plugin

Answer 2

弗蘭克剛纔提到_Service仍然是空。按照這個模板您的Execute方法裏面：

public void Execute(IServiceProvider serviceProvider){ 

// Obtain the execution context from the service provider. 
Microsoft.Xrm.Sdk.IPluginExecutionContext context = (Microsoft.Xrm.Sdk.IPluginExecutionContext) 
      serviceProvider.GetService(typeof(Microsoft.Xrm.Sdk.IPluginExecutionContext)); 

// Obtain the organization service reference. 
IOrganizationServiceFactory serviceFactory = (IOrganizationServiceFactory serviceProvider.GetService(typeof(IOrganizationServiceFactory)); 

IOrganizationService service = serviceFactory.CreateOrganizationService(context.UserId); 

}