Question

我需要在Lead和自定义实体之间以及Contact和自定义实体之间创建/定义多对多关系。我似乎找不到任何我想做的代码示例。

这需要在CRM 4和CRM 5中都有效。

做两个N：1关系而不是N：N关系有什么缺点吗？

Answer 1

通过转到实体N：N关系，您可以通过UI执行N：N关系。与中间实体进行2 N：1关系比使用单个N：N更有优势，例如您可以存储关系属性（关系的角色），还可以通过双N：1关系链接工作流。

编辑：

要通过代码创建N：N关系，您可以参考下面摘录的CRM 2011 SDK帮助页面“创建和检索实体关系”。您可以通过4.0中的元数据服务 -

执行类似的操作

创建N：N实体关系

以下示例使用EligibleCreateManyToManyRelationship方法验证Account和Campaign实体是否可以参与N：N实体关系，然后使用CreateManyToManyRequest创建实体关系。

bool accountEligibleParticipate =
    EligibleCreateManyToManyRelationship("account");
bool campaignEligibleParticipate =
    EligibleCreateManyToManyRelationship("campaign");

if (accountEligibleParticipate && campaignEligibleParticipate)
{

    CreateManyToManyRequest createManyToManyRelationshipRequest =
        new CreateManyToManyRequest
    {
        IntersectEntitySchemaName = "new_accounts_campaigns",
        ManyToManyRelationship = new ManyToManyRelationshipMetadata
        {
            SchemaName = "new_accounts_campaigns",
            Entity1LogicalName = "account",
            Entity1AssociatedMenuConfiguration =
            new AssociatedMenuConfiguration
            {
                Behavior = AssociatedMenuBehavior.UseLabel,
                Group = AssociatedMenuGroup.Details,
                Label = new Label("Account", 1033),
                Order = 10000
            },
            Entity2LogicalName = "campaign",
            Entity2AssociatedMenuConfiguration =
            new AssociatedMenuConfiguration
            {
                Behavior = AssociatedMenuBehavior.UseLabel,
                Group = AssociatedMenuGroup.Details,
                Label = new Label("Campaign", 1033),
                Order = 10000
            }
        }
    };

    CreateManyToManyResponse createManytoManyRelationshipResponse =
        (CreateManyToManyResponse)_serviceProxy.Execute(
        createManyToManyRelationshipRequest);


    _manyToManyRelationshipId =
        createManytoManyRelationshipResponse.ManyToManyRelationshipId;
    _manyToManyRelationshipName =
        createManyToManyRelationshipRequest.ManyToManyRelationship.SchemaName;

    Console.WriteLine(
        "The many-to-many relationship has been created between {0} and {1}.",
        "account", "campaign");
}

<强> EligibleCreateManyToManyRelationship

以下示例创建一个EligibleCreateManyToManyRelationship方法，该方法使用CanManyToManyRequest来验证实体是否可以参与N：N实体关系。

/// <summary>
/// Determines whether the entity can participate in a many-to-many relationship.
/// </summary>
/// <param name="entity">Entity</param>
/// <returns></returns>
public bool EligibleCreateManyToManyRelationship(string entity)
{
    CanManyToManyRequest canManyToManyRequest = new CanManyToManyRequest
    {
        EntityName = entity
    };

    CanManyToManyResponse canManyToManyResponse =
        (CanManyToManyResponse)_serviceProxy.Execute(canManyToManyRequest);

    if (!canManyToManyResponse.CanManyToMany)
    {
        Console.WriteLine(
            "Entity {0} can't participate in a many-to-many relationship.", 
            entity);
    }

    return canManyToManyResponse.CanManyToMany;
}

使用C＃在CRM 4和5中创建多对多关系

1 个答案: