我有一个带有列的表结构
FeesNormal
FeesCustom
货币
现在我正在寻找按货币计算的SUM功能组.
例如20美元30欧元40 INR来自此表
如果FeesCustom>我还必须考虑这个场景. 0我必须忽略该行的FeesNormal
样本日期和预期结果是这样的
FeesNormal FeesCustom Currency 10 0 USD 15 25 USD //in this case can ignore FeesNormal Since FeesCustom is more 5 10 EUR //same for this row ignore FeesNormal 10 0 EUR Expected result 35 USD 20 EUR
我能够使用linq找到总和
int sum_custom=(int)fee_list.Where(p => p.FeesCustom > 0).Sum(p => p.FeesCustom); int sum_normal = (int)fee_list.Where(p => p.FeesCustom ==0).Sum(p => p.FeesNormal);
解决方法
在我看来,你只需要从“入门”到“有效费用”的预测,你可以总结 – 如：
var result = source
.GroupBy(x => x.Currency)
.Select(g => new {
Currency = g.Key,Total = g.Sum(x => x.FeesCustom > 0 ? x.FeesCustom : x.FeesNormal)
});
这相当于：
var result = source
.GroupBy(x => x.Currency,(key,values) => new {
Currency = key,Total = values.Sum(x => x.FeesCustom > 0 ? x.FeesCustom : x.FeesNormal)
});
或者先进行转换：
var result = source
.Select(x => new {
x.Currency,x.Fee = x => x.FeesCustom > 0 ? x.FeesCustom : x.FeesNormal
})
.GroupBy(x => x.Currency,x => x.Fee,values) => new { Currency = key,Fee = values.Sum() });
