订购以特定顺序订购linq表达式以查找单列

Question

我有这个orderby问题，我需要根据列值排序linq表达式。代码是这样的。

JsonResult resultCombined = new JsonResult();
List<String> preferences = new List<String> { "E", "M", "H"};
var listCounties = sc.Districts(null, null);
var listSchools = sc.Schools(s => s.YEAR == "2015");

var result = listCounties.Join(listSchools, 
    i1 => i1.LEA, 
    i2 => i2.LEA, 
    (i1, i2) => new { i1, i2 })
.OrderBy(i3=>i3.i2.SCHOOLCODE)
.ThenBy(i3 => i3.i2.SCHOOLNAME);

resultCombined.Data = result;
return resultCombined;

这里我的问题是我需要根据优先顺序订购结果，其中SCHOOLCODE包含首选项。只需订购SCHOOLCODE就不会给我订单。请帮我一些建议或代码。

谢谢

Answer 1

尝试先过滤记录，然后应用排序。

var result = listCounties.Join(listSchools, 
    i1 => i1.LEA, 
    i2 => i2.LEA, 
    (i1, i2) => new { i1, i2 })
.Where(i3=>i3.i2.SCHOOLCODE.Contains(preference)
.OrderBy(i3=>i3.i2.SCHOOLCODE)
.ThenBy(i3 => i3.i2.SCHOOLNAME);