C# 商机实体的crm2011插件问题

我创建了crm2011插件，该插件在Opportunity上的更新消息（Pre_操作）时触发。在插件中，我使用电子邮件模板，并使用电子邮件模板发送电子邮件。当我运行时，插件无法使用电子邮件模板发送电子邮件，尽管模板id是正确的。我收到错误消息“对象引用未设置为对象的实例”。请帮助我…这是我的插件代码

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

}

namespace Ppp.CRM.Plugin.OpptBidOwnerChange
{
公共类投标人变更：IPlugin
{
#区域级变量
IServiceProvider\u服务提供商；
IOOrganizationServiceFactory\u serviceFactory=null；
IOrganizationService _service=null；
IPluginExecutionContext_context=null；
实体_target=null；
实体_preImage=null；
实体_postImage=null；
Guid\u当前用户；
Guid pre_bidownerid=Guid.Empty；
Guid tag_bidownerid=Guid.Empty；
Guid ownerid=Guid.Empty；
Guid opportunityid=Guid.Empty；
#端区
#区域IPlugin成员
public void Execute（IServiceProvider服务提供程序）
{
尝试
{
字符串消息=null；
_服务提供者=服务提供者；
_上下文=（IPluginExecutionContext）
GetService（typeof（IPluginExecutionContext））；
_serviceFactory=（IOOrganizationServiceFactory）serviceProvider.GetService（typeof（IOOrganizationServiceFactory））；
_currentUser=\u context.UserId；
message=_context.MessageName.ToLower（）；
if（message==“update”）//message==“create”|
{
if（_context.InputParameters.Contains（“Target”）&&&_context.InputParameters[“Target”]！=null）
_target=（实体）_context.InputParameters[“target”]；
if（_context.PreEntityImages.Contains（“PreImage”）&&&_context.PreEntityImages[“PreImage”]！=null）
_preImage=（实体）_context.PreEntityImages[“preImage”]；
if（_context.PostEntityImages.Contains（“PostImage”）&&&_context.PostEntityImages[“PostImage”]！=null）
_postImage=（实体）_context.PostEntityImages[“postImage”]；
if（_preImage.Attributes.Contains（“hm_bidowner”））
{
EntityReference所有者=（EntityReference）_preImage.Attributes[“hm_bidowner”]；
pre_bidownerid=所有者Id；
_target.Attributes[“hm_previousbidowner”]=新的EntityReference（“systemuser”，owner.Id）；
}
如果（_target.Attributes.Contains（“hm_bidowner”））
{
EntityReference所有者=（EntityReference）_target.Attributes[“hm_bidowner”]；
tag_bidownerid=owner.Id；
}
if（_preImage.Attributes.Contains（“ownerid”））
{
EntityReference所有者=（EntityReference）_preImage.Attributes[“ownerid”]；
ownerid=所有者Id；
}
opportunityid=_target.Id；
ActivityParty emailFrom=new ActivityParty{PartyId=new EntityReference（“systemuser”，\u context.UserId）}；
List emailTo=新列表（）；
//提醒用户
if（_preImage.Attributes.Contains（“ownerid”））
{
emailTo.Add（新的ActivityParty{PartyId=new EntityReference（“systemuser”，ownerid）}）；
}
if（_preImage.Attributes.Contains（“hm_bidowner”））
{
emailTo.Add（新活动方{PartyId=new EntityReference（“systemuser”，pre_bidownerid）}）；
}
如果（_target.Attributes.Contains（“hm_bidowner”））
{
//emailTo.Add（新的ActivityParty{PartyId=（（EntityReference）_target[“hm_bidowner”]））；
emailTo.Add（新的ActivityParty{PartyId=newentityreference（“systemuser”，tag_bidownerid）}）；
}
电子邮件=新电子邮件（）；
email.From=new ActivityParty[]{emailFrom}；
如果（emailTo.Count（）>0）
email.To=emailTo；
Guid templateId=Guid.Empty；
templateId=新Guid（“EC361CDE-6C9E-E111-BF90-D8D3855BE525”）；//ACE17A0C-279B-E111-9E28-080027332B48
SendEmailFromTemplateRequest emailUsingTemplateReq=新建SendEmailFromTemplateRequest
{
目标=电子邮件，
TemplateId=TemplateId，
RegardingId=机会主义ID，
RegardingType=Opportunity.EntityLogicalName
};
SendEmailFromTemplateResponse EmailUsingTemplateResponse=（SendEmailFromTemplateResponse）\ u service.Execute（emailUsingTemplateReq）；
}
}
捕获（例外情况除外）
{
抛出新的InvalidPlugineExecutionException（例如消息，例如）；
}
}
#端区
#区域客户关系管理服务
私有void CreateCRMService（）
{
尝试
{
_服务=\u serviceFactory.CreateOrganizationService（\u currentUser）；
}
捕获（例外情况除外）
{
掷骰子；
}
}
#端区
}

}

\u服务

代码中的值仍然为空
这意味着您尚未重新初始化该值

请参考这些链接

1.
2.

---

3.

正如弗兰克刚才提到的那样，服务仍然是空的。在执行方法中遵循此模板：

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);

}

---

请告诉我哪一行代码给出了错误

对象引用未设置为对象的实例

，以便我可以给你建议？这一行代码给出了错误“对象引用未设置为对象的实例”SendEmailFromTemplateResponse emailUsingTemplateResp=（从TemplateResponse发送电子邮件）\u service.Exec

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);

}