Linq to sql SQL到Linq_到_SQL查询转换

如何在linq中转换此SQL查询我不应该这样做，但应该是这样的

select LOC,Date,
    SUM(case when (Local='HO' and Type='CASE') then TotalAmt else 0 end) as col1,
    SUM(TotalAmt) as Total
    from TableName
    where Status='APP'
    group by LOC,Date;

.其中（m=>m.状态==“应用程序”）
.GroupBy（m=>new{m.Loc，m.Date}）
.选择（g=>new{
总计=总金额（x=>x.TotalAmt），
col1=g.Where（m=>m.Local==“HO”和&m.Type==“CASE”）.Sum（x=>（int？）x.TotalAmt）？0
});

<YourSourceForTableName>
          .Where(m => m.Status == "APP")
          .GroupBy(m => new {m.Loc, m.Date})
          .Select(g => new {
                  total = g.Sum(x => x.TotalAmt),
                  col1 = g.Where(m => m.Local == "HO" && m.Type == "CASE").Sum(x => (int?)x.TotalAmt) ?? 0
          });