得到错误 - ＆gt; System.Linq.Enumerable + WhereSelectListIterator`2 [Tdsb.Aris.Pims.Entity.PartnershipFunding，System.String]

Question

private string Paidby
{
    get
    {
        string paidBy = string.Empty;

        if(this.PartnershipFundingEntity!=null)
        {
            paidBy = (PartnershipFundingEntity.Where(x => x.FundingTypeId == 1).Select(y => y.CfPurposeList)).ToString();
        }
        return paidBy;
    }
}

收到错误，如 - ＆gt;

  

System.Linq.Enumerable + WhereSelectListIterator`2 [Tdsb.Aris.Pims.Entity.PartnershipFunding，System.String]

Answer 1

您的问题提示错误，但值似乎是推入paidBy string的类型名称：

paidBy = (PartnershipFundingEntity
   .Where(x => x.FundingTypeId == 1)          // where iterator at this point
   .Select(y => y.CfPurposeList))             // WhereSelectListIterator at this point
   .ToString();                               // ToString() returns type name by default

我认为你应该有这样的事情：

paidBy = PartnershipFundingEntity
   .Where(x => x.FundingTypeId == 1)
   .First(x => <boolean condition to select one element>)
   .PaidByProp;

如果找到单个元素，则此方法有效，否则应使用FirstOrDefault并测试null。我认为?.（null条件）可用于缩小到单个指令。