如何通过 Dynamics 365 CRM 中的 C# 插件填充查找字段

Question

有一个联系实体；在其中一个城市查找字段， 通过控制台应用程序创建新联系人（给定详细信息名字、姓氏、城市）。 我似乎无法理解如何填写查找字段...？ 这是我的代码：

// here supposed to pass in addition to lastname, A lookup parameter to fill after finding the contact
static void FillContactLookupByLastname(string lastname /*, Lookup City*/) 
        {
            ConditionExpression condition1 = new ConditionExpression();
            condition1.AttributeName = "lastname";
            condition1.Operator = ConditionOperator.Equal;
            condition1.Values.Add(lastname);

            FilterExpression filter1 = new FilterExpression();
            filter1.Conditions.Add(condition1);

            QueryExpression query = new QueryExpression("contact");
            query.ColumnSet.AddColumns("firstname", "lastname");
            query.Criteria.AddFilter(filter1);

            EntityCollection result1 = crmService.RetrieveMultiple(query);
            Console.WriteLine(); Console.WriteLine("Query using Query Expression with ConditionExpression and FilterExpression");
            Console.WriteLine("---------------------------------------");
            foreach (var a in result1.Entities)
            {
                Console.WriteLine("Name: " + a.Attributes["firstname"] + " " + a.Attributes["lastname"]);
//here after finding the contact with the lastname, it has a lookup field that i need to fill but i dont know how
            }
        }

Answer 1

您可以使用 EntityReference 类处理查找字段。
以这种方式传递EntityReference 参数

static void FillContactLookupByLastname(string lastname, EntityReference city) 

然后填写值

a["city"] = city;

也不要忘记为实体调用Update 方法

crmService.Update(a);