Question

我使用crm 2016并尝试根据linkentity过滤获取产品（自定义实体）记录，我需要获得所有具有Active productstatus和链接电话呼叫类别的产品fun和not open：

产品 - （productstatus = Active）＆amp; （linkedphonecallcategory = fun＆amp;＆amp; linkedphonecallstatus！= open）

当我运行当前查询时，我得到的结果没有链接实体过滤器。我不明白为什么。

这是我的代码：

FilterExpression filter1 = new FilterExpression(LogicalOperator.And);
filter1.Conditions.Add(new ConditionExpression("phonecallcategory", ConditionOperator.Equal, "fun"));
filter1.Conditions.Add(new ConditionExpression("statecode", ConditionOperator.NotEqual, 0));

LinkEntity phoneCallLink = new LinkEntity("product", "phonecall", "productid", "regardingobjectid", JoinOperator.LeftOuter);
phoneCallLink.LinkCriteria = filter1;
phoneCallLink.EntityAlias = "products";

QueryExpression query = new QueryExpression("product");
query.ColumnSet = new ColumnSet("productname");
query.LinkEntities.Add(phoneCallLink);
query.Criteria.AddCondition(new ConditionExpression("productstatus", ConditionOperator.Equal, 0)); 

EntityCollection AllProductsWithSpecificCallsNotOpen = new EntityCollection();

Answer 1

我认为您的问题出在QueryExpression query = new QueryExpression("product");

您的问题是您的Product是自定义实体，但您已使用不允许活动的系统实体Product的架构名称。

您必须使用实体的逻辑（全部小写）名称

您也可以使用 XrmToolbox 生成此代码。这是我使用此工具生成的示例查询。请注意：

我使用Contact代替Product
我已删除了连接类型，因此它将恢复为内连接

代码：

// Initialise
var QEcontact = new QueryExpression("contact");

// Add columns to QEcontact.ColumnSet
QEcontact.ColumnSet.AddColumns("firstname");

// Add link-entity QEcontact_phonecall
var QEcontact_phonecall = QEcontact.AddLink("phonecall", "contactid", "regardingobjectid");

// Define filter QEcontact_phonecall.LinkCriteria
QEcontact_phonecall.LinkCriteria.AddCondition("category", ConditionOperator.Equal, "fun");
QEcontact_phonecall.LinkCriteria.AddCondition("statuscode", ConditionOperator.NotEqual, 1);

Answer 2

我只想分享您期望的查询的可读格式。也像jasonscript提到的那样，在xrmtoolbox中使用Adv Find或FetchXML构建器来构建fetchxml查询，你可以查看与其本身等效的SQL和Query表达式。

QueryExpression query = new QueryExpression("product")
{
    ColumnSet = new ColumnSet("productname"), 
    Criteria = new FilterExpression(LogicalOperator.And)
    {
        Conditions =
        {
               new ConditionExpression("productstatus", ConditionOperator.Equal, 0)
        }
    },
    LinkEntities =
    {
        new LinkEntity("product", "phonecall", "productid", "regardingobjectid", JoinOperator.LeftOuter)
        {
            Columns = new ColumnSet("phonecallcategory"),
            LinkCriteria = new FilterExpression(LogicalOperator.And)
            {
                Conditions =
                {
                    new ConditionExpression("statecode", ConditionOperator.NotEqual, 0),
                    new ConditionExpression("phonecallcategory", ConditionOperator.Equal, "fun")
                }
            }
        }
    }
};

Answer 3

尝试改用FetchXml查询。使用这种方法，您可以使用“高级查找”来创建过滤器。然后，在窗口中下载FetchXml。到目前为止，调试起来更加容易。

https://msdn.microsoft.com/en-us/library/gg328332.aspx

Answer 4

您可以看看这里，我已经重新组织了您的查询以使其易于理解

示例：QueryExpression 和 LinkEntity

//Link
LinkEntity phoneCallLink = new LinkEntity();
phoneCallLink.LinkFromEntityName  = "new_product";
phoneCallLink.LinkToEntityName = "phonecall";
phoneCallLink.LinkFromAttributeName = "new_productid";
phoneCallLink.LinkToAttributeName = "regardingobjectid";
phoneCallLink.JoinOperator = JoinOperator.LeftOuter;
phoneCallLink.EntityAlias = "phone";
phoneCallLink.LinkCriteria.Conditions.Add(new ConditionExpression("statecode", ConditionOperator.NotEqual, 0));
phoneCallLink.LinkCriteria.Conditions.Add(new ConditionExpression("phonecallcategory", ConditionOperator.Equal, "fun"));

//Query
QueryExpression query = new QueryExpression("new_product");
query.ColumnSet = new ColumnSet("new_name");
query.LinkEntities.Add(phoneCallLink);
query.Criteria.AddCondition(new ConditionExpression("statecode", ConditionOperator.Equal, 0)); 

//Execute
var AllProductsWithSpecificCallsNotOpen = service.RetrieveMultiple(query);

如果这仍然不起作用，您可以构建并导出 fetchXml 查询并将其转换为查询表达式：

示例：将 FetchXml 转换为 QueryExprssion

    string fetchXml =
    @"<fetch version='1.0' output-format='xml-platform' mapping='logical' distinct='false'>
  <entity name='account'>
    <attribute name='name' />
    <attribute name='accountid' />
    <order attribute='createdon' descending='true' />
    <order attribute='modifiedon' descending='true' />
    <filter type='and'>
      <condition attribute='createdon' operator='this-month' />
    </filter>
  </entity>
</fetch>";
    
    // Convert the FetchXML into a query expression.
    var conversionRequest = new FetchXmlToQueryExpressionRequest();
    conversionRequest.FetchXml = fetchXml; //fetchXml string

    var conversionResponse =(FetchXmlToQueryExpressionResponse)service.Execute(conversionRequest);
    var result = conversionResponse.Results.FirstOrDefault();

Answer 5

换行：

LinkEntity phoneCallLink = new LinkEntity("product", "phonecall", "productid", "regardingobjectid", JoinOperator.LeftOuter);

致：

LinkEntity phoneCallLink = new LinkEntity("product", "phonecall", "productid", "regardingobjectid", JoinOperator.Inner);

如何在链接实体上使用过滤器？

5 个答案: