如何识别实体类型？

Question

如果我有一个记录的 GUID，但我不知道它是一个帐户还是一个联系人，我如何检索该记录并识别它的类型？

例如，我可以像这样检索 指定的 类型：

        var serviceAppointment = organizationService.Retrieve(
            "serviceappointment",
            serviceActivityGuid,
            new ColumnSet(true));

但是，如果我不知道它是什么类型的记录，我如何检索它并识别它的类型？

像这样：

        var myEntity = organizationService.Retrieve(
            "????",
            myEntityGuid,
            new ColumnSet(true));

Answer 1

您不能仅通过 GUID 进行搜索。您需要 GUID 和实体逻辑名称。

每当您使用代码、c# 或 javascript 检索实体引用时，该对象将包含实体逻辑名称

更新以尝试查找具有给定 ID 的帐户：

Guid Id = // Your GUID
IOrganizationService serviceProxy = // Create your serivce proxy 
var accountQuery = new QueryExpression
                   {
                       EntityName = "account",
                       TopCount = 1,
                       Criteria =
                       { 
                           Conditions = 
                           { 
                               new ConditionExpression("accountid", ConditionOperator.Equal, Id) 
                           }
                       }
                    } 
var response = serviceProxy.RerieveMultiple(accountQuery);
if(null == response.Entities.FirstOrDefault())
{
    //No Account Record Found 
}

Answer 2

如果你从 Nuget 引用 DLaB.Xrm，你可以这样写：

bool isAccount = service.GetEntitiesById<Account>(customerId).Count == 1;

如果您想实际获得实际值，可以这样做。

var customerId = System.Guid.NewGuid();
var entity = service.GetEntitiesById<Account>(customerId).FirstOrDefault() ??
             service.GetEntitiesById<Contact>(customerId).FirstOrDefault() as Entity;

if (entity != null)
{
    var account = entity as Account; // will be null if the Guid was for a contact
    var contact = entity as Contact; // will be null if the Guid was for an account
}

Answer 3

如果您只需要区分 Account 和 Contact 并想确保记录确实存在，您也可以使用他们的 CustomerAddress，LEFT OUTER JOIN两者兼顾，Account 和 Contact：

var query = new QueryExpression
{
    EntityName = "customeraddress",
    ColumnSet = new ColumnSet("customeraddressid"),
    TopCount = 1,
    Criteria = new FilterExpression
    {
        Conditions =
        {
            // limit to Address 1
            new ConditionExpression("addressnumber", ConditionOperator.Equal, 1),
            // filter by "anonymous" GUID
            new ConditionExpression("parentid", ConditionOperator.Equal, myEntityGuid),
        },
    },
    LinkEntities =
    {
        new LinkEntity
        {
            EntityAlias = "acc",
            Columns = new ColumnSet("name"),
            LinkFromEntityName = "customeraddress",
            LinkFromAttributeName = "parentid",
            LinkToAttributeName = "accountid",
            LinkToEntityName = "account",
            JoinOperator = JoinOperator.LeftOuter
        },
        new LinkEntity
        {
            EntityAlias = "con",
            Columns = new ColumnSet("fullname"),
            LinkFromEntityName = "customeraddress",
            LinkFromAttributeName = "parentid",
            LinkToAttributeName = "contactid",
            LinkToEntityName = "contact",
            JoinOperator = JoinOperator.LeftOuter
        },
    },
};

... 将允许您一次性检索帐户或联系人：

var customer = service.RetrieveMultiple(query).Entities.FirstOrDefault();

...但需要通过 AliasedValues:

访问他们的字段

string customername = (customer.GetAttributeValue<AliasedValue>("acc.name") ?? customer.GetAttributeValue<AliasedValue>("con.fullname") ?? new AliasedValue("whatever", "whatever", null)).Value as string;

...这会使阅读很多属性有点混乱。

Answer 4

我知道这是一个老问题，但我想我会添加一些内容，以防将来有人遇到与我类似的问题。在这种情况下，它可能与 OP 要求的并不完全相同。

我必须确定一个实体是一种还是另一种类型，因此我可以使用一种方法，而不必为每个实体编写独立的方法。这里是：

var reference = new EntityReference
{
    Id = Guid.NewGuid(),
    LogicalName = "account" //Or some other logical name - "contact" or so.
}

并将其传递到以下方法中，可以识别类型。

public void IdentifyType(EntityReference reference)
{
    switch(reference.LogicalName)
    {
        case Account.EntityLogicalName:
            //Do something if it's an account.
            Console.WriteLine($"The entity is of type {nameof(Account.EntityLogicalName)}."
        case Contact.EntityLogicalName:
            //Do something if it's a contact.
            Console.WriteLine($"The entity is of type {nameof(Contact.EntityLogicalName)}."
        default:
            //Do something if neither of above returns true.
            Console.WriteLine($"The entity is not of type {nameof(Account.EntityLogicalName)} or {nameof(Contact.EntityLogicalName)}."
    }
}

如何识别实体类型？

How to identify the type of entity?

.net

c#

dynamics-crm

visual-studio

dynamics-crm-2011