Linq to Entities SqlFunctions.DateDiff不受支持

Question

我有以下代码

DateTime now = DateTime.UtcNow;

var allItemsOver64 = _inventoryContext.Items.Where(i => 
   (SqlFunctions.DateDiff("dd", i.PrimaryInsured.DoB, now) / 365.0) >= 65);

IQueryable<Item> items65To69 = allItemsOver64.Where(i =>
   (SqlFunctions.DateDiff("dd", i.PrimaryInsured.DoB, now) / 365.0) >= 65 &&
   (SqlFunctions.DateDiff("dd", i.PrimaryInsured.DoB, now) / 365.0) <= 69);

但是当我尝试使用allItemsOver64因此Items65To69.Count()时,我得到了这个错误

表达式((((转换(DateDiff("dd",[10007] .PrimaryInsured.DoB,26/04/2012 15:03:09))/ 365)> = 65)和((转换(DateDiff("dd) ",[10007] .PrimaryInsured.DoB,26/04/2012 15:03:09))/ 365)> = 65))和((转换(DateDiff("dd",[10007] .PrimaryInsured.DoB,26/04/2012 15:03:09))/ 365)<= 69))不受支持.

我究竟做错了什么？

Answer 1

也许你可以尝试使用EntityFunctions而不是SqlFunctions.