将EntityReference转换为Entity [英] Convert EntityReference to Entity

问题描述

有人知道如何将EntityReference转换为Entity。

Does anyone know how can Convert EntityReference to Entity.

protected override void Execute(CodeActivityContext executionContext)
{
    [Input("Email")]
    [ReferenceTarget("email")]
    public InArgument<Entity> EMail { get; set; }


    Entity MyEmail = EMail.Get<Entity>(executionContext);

这给我一个错误。无法转换。

This give me an error. Cannot convert this.

推荐答案

问题的最简单答案是查询数据库，以查询由实体引用指出（引用）的实体。我一直将实体引用视为（大致）等同于C ++中的指针。它有地址（引导），但是您需要取消引用它才能进入蜂蜜。

The shortest answer to your questions is to query the database for the entity that's pointed out (referred to) by the entity reference. I've always viewed entity references as (rough) equivalent to the pointers in C++. It's got the address to it (guid) but you need to de-reference it in order to get to the honey. You do that like this.

IOrganizationService organization = ...;
EntityReference reference = ...;

Entity entity = organization.Retrieve(reference.LogicalName, reference.Id, 
  new ColumnSet("field_1", "field_2", ..., "field_z"));

当我做了很多从 EntityReference 到 Entity的转换时，我为字段部署了带有可选参数的扩展方法。

When I do a lot of converting from EntityReference to Entity, I deploy the extension method with optional parameter for the fields.

public static Entity ActualEntity(this EntityReference reference,
  IOrganizationService organization, String[] fields = null)
{
  if (fields == null)
    return organization.Retrieve(reference.LogicalName, reference.Id, 
      new ColumnSet(true));
  return organization.Retrieve(reference.LogicalName, reference.Id, 
    new ColumnSet(fields));
}

您可以阅读更多内容并进行比较 EntityReference 和实体。

You can read more and compare EntityReference and Entity.

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