在C＃中的CRM 4和5中創建多對多關係

Question

我需要創建/定義一個潛在客戶和一個自定義實體之間以及一個聯繫人和一個自定義實體之間的多對多關係。我似乎無法找到我想要做的任何代碼示例。

這需要在兩者CRM 4和CRM 5.

是否有任何缺點做兩個N的工作：1的關係，而不是N：N的關係？

Answer 1

您可以通過轉到實體N：N關係，通過UI執行N：N關係。與一箇中間實體在執行單個N：N時建立2個N：1關係是有利的，例如您可以存儲關係屬性（關係的角色），還可以通過雙N：1關係鏈接工作流。

編輯：通過代碼，你可以參考CRM 2011 SDK幫助頁「創建和檢索實體關係」，摘錄如下ñ關係：

要創建n個。您將能夠通過在4.0元數據服務類同做點什麼 -

創建N：N實體關係

下面的示例使用EligibleCreateManyToManyRelationship方法來驗證帳戶和廣告活動的實體可以參與N：N實體關係，然後使用CreateManyToManyRequest創建實體關係。

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"); 
} 

EligibleCreateManyToManyRelationship

下面的示例將創建一個使用CanManyToManyRequest來驗證實體是否能夠參與N A EligibleCreateManyToManyRelationship方法：N實體關係。

/// <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; 
}