小编naz*_*vic的帖子

我正在学习haskell并看到了函数组合.试图复合map和foldl

mapd = (map.foldl)

比

test = (mapd (\x y -> x + y ) [1,2,3,4])

测试类型是

test :: [[Integer] -> Integer]

那么这种类型的声明是什么意思呢？

我正在尝试检索其中"requiredattendees"包含在帐户列表中的某个实体上的约会.requiredattendees有一种PartyList.我的查询如下:

var query = new QueryExpression("appointment")
{
      ColumnSet = columnSet,
      Criteria = new FilterExpression(LogicalOperator.Or)
};

并添加条件:

GetAccounts()
.Select(a => new ConditionExpression("requiredattendees", ConditionOperator.Contains, a.Id))
.ForEach(c => query.Criteria.AddCondition(c));


a.Id is the account guid.

我收到以下错误:

Cannot add attribute requiredattendees of type partylist in a condition
System.ServiceModel.FaultException`1[[Microsoft.Xrm.Sdk.OrganizationServiceFault, Microsoft.Xrm.Sdk, Version=5.0.0.0, Culture=neutral]]