[英]PredicateBuilder and LINQ to CRM
我试图提取具有多个谓词的(从AsyncOperationBase
表中)运行的工作流的所有实例。
我知道您不能使用诸如myArray.Contains(x.WorkflowActivationId.Id)
类的东西,因此我正在尝试使用PredicateBuilder
动态构建PredicateBuilder
这是我到目前为止的内容:
var predicate = PredicateBuilder.False<Service.AsyncOperation>();
//Apparently, checking for null is suppose to prevent my issue from happening...
predicate = predicate.And(x => x.Name == searchWorkflowDefinitionText.Text);
predicate = predicate.And(x => x.StatusCode != null);
predicate = predicate.And(x => x.StatusCode.Value == 10);
predicate = predicate.And(x => x.WorkflowActivationId != null);
foreach (Guid s in listBox3.Items)
{
predicate = predicate.Or(x => x.WorkflowActivationId.Id == s);
}
var r = (from c in xrm.CreateQuery<Service.AsyncOperation>().AsExpandable().Where(predicate)
select c).ToList();
但是我最终得到了很多LINQ to CRM可怕的异常:
Invalid 'where' condition. An entity member is invoking an invalid property or method.
据我所知,要避免出现此错误,您需要“抓取”属性。 像:
predicate = predicate.Or(x => x.WorkflowActivationId == s);
必须更改为
predicate = predicate.Or(x => x.WorkflowActivationId.Id == s);
而且,谓词的左侧必须是实体属性。 再次,据我所知,我的谓词满足了这些要求,所以我在这里有点茫然。
有任何想法吗 ?
我认为我需要通过执行这两个步骤来绕过LINQ达到CRM的极限。
第一:
var t = xrm.AsyncOperationSet.Where(x => x.StatusCode.Value == 10 && x.Name == wkname).Select(y => new Service.AsyncOperation
{
AsyncOperationId = y.AsyncOperationId.Value,
WorkflowActivationId = y.WorkflowActivationId
}).ToList();
目前,我真的只需要这两个属性。
然后,我就可以拥有完整LINQ访问t
的内容。
var y = t.Where(x => myArray.Contains(x.WorkflowActivationId.Id)).ToList();
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