[英]Retrieve N:N relationship Dynamics CRM/Dataverse C# Plugin
我有一个我自己似乎无法解决的问题。 我有多种情况需要仅使用关系一侧的 ID 检索 N:N 数据。
示例:我需要找到 N:N 培训的所有学员。 我有培训 ID 如何查询?
我尝试了以下方法:在此示例中:
cursist = 实习生
opleiding = 培训
if (context.MessageName == "Update" && context.Stage == 20)
{
targetEntity = context.InputParameters["Target"] as Entity;
List<Guid> cursistID = new List<Guid>();
QueryExpression query = new QueryExpression("cref8_cursist");
query.ColumnSet = new ColumnSet(new string[] { "cref8_cursistid" });
LinkEntity linkEntity1 = new LinkEntity("cref8_cursist", "cref8_Opleiding_cref8_Cursist_cref8_Cursi", "cref8_cursistid", "cref8_cursistid", JoinOperator.Inner);
LinkEntity linkEntity2 = new LinkEntity("cref8_Opleiding_cref8_Cursist_cref8_Cursi", "cref8_opleiding", "cref8_opleidingid", "cref8_opleidingid", JoinOperator.Inner);
linkEntity1.LinkEntities.Add(linkEntity2);
query.LinkEntities.Add(linkEntity1);
linkEntity2.LinkCriteria = new FilterExpression();
linkEntity2.LinkCriteria.AddCondition(new ConditionExpression("cref8_opleidingid", ConditionOperator.Equal, targetEntity.Id));
EntityCollection cursistCollection = service.RetrieveMultiple(query);
if (cursistCollection.Entities.Count > 0)
{
foreach (var cursist in cursistCollection.Entities)
{
//DO SOME LOGIC
}
}
}
这最终导致以下错误:在 MetadataCache 中找不到名称 = 'cref8_Opleiding_cref8_Cursist_cref8_Cursi' 且名称映射 = 'Logical' 的实体。
最好的问候,安东尼
您在这里只需要一个 LinkEntity。
var query = new QueryExpression("cref8_cursist");
query.ColumnSet.AddColumn("cref8_cursistid");
var intersection = new LinkEntity
{
LinkFromEntityName = "cref8_cursist",
LinkToEntityName = "cref8_Opleiding_cref8_Cursist_cref8_Cursi",
LinkFromAttributeName = "cref8_cursistid",
LinkToAttributeName = "cref8_cursistid",
JoinOperator = JoinOperator.Inner
};
intersection.LinkCriteria.AddCondition("cref8_opleidingid", ConditionOperator.Equal, targetEntity.Id);
query.LinkEntities.Add(intersection);
var cursistCollection = service.RetrieveMultiple(query);
还要确保你与这个名字cref8_Opleiding_cref8_Cursist_cref8_Cursi
有 N:N 关系
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