从查询字段中检索值时出现无效参数错误

Question

我在Lead实体上有帐户和联系人查询字段。我想获取联系人的帐户名称和电子邮件地址。

我收到无效参数错误。

代码：

    public EntityCollection  GetDetails()
    {
        string fetchXML = @"<fetch version='1.0' output-format='xml-platform' mapping='logical' distinct='false'>
                      <entity name='lead'>
                        <attribute name='fullname' />
                        <attribute name='leadid' />      
                        <attribute name='new_contact'/>
                        <attribute name='new_account'/>
                        <order attribute='fullname' descending='false' />
                        <filter type='and'>                             
                          <condition attribute='leadqualitycode' operator='eq' value='1' />
                        </filter>                            
                      </entity>
                    </fetch>";
        EntityCollection records = service.RetrieveMultiple(new FetchExpression(fetchXML));
        return records;         
    }

    public string GetAccountDetail(EntityCollection records)
    {
        if (records.Entities.Count != 0)
        {
            accountid = records.Entities[0].GetAttributeValue<Guid>("new_account");
            tracingService.Trace("AccountId :" + accountid);
            Entity accountDetails = service.Retrieve("account", accountid, new ColumnSet("name"));
            string accountname = accountDetails.Attributes["name"].ToString();              
            tracingService.Trace("AccountName :" + accountname);
            return accountname;
        }
        return name;
    }

Answer 1

更改此行

accountid = records.Entities[0].GetAttributeValue<Guid>("new_account");

进入

accountid = records.Entities[0].GetAttributeValue<EntityReference>("new_account").Id;

因为这是一次查找。