CodeGo.net>如何在LINQ中选择查询时如何存储变量?
作者:互联网
我有这样的LINQ查询:
var q = from p in m.TblOzvs.AsEnumerable()
where (p.OzviyatNumber == txtSearch.Text)
select new mylist
{
Col1 = p.OzviyatNumber.ToString(),
Col2 = p.Name,
Col3 = Calculate._RPMajmoSoodeGhest(p.OzviyatNumber)[1],
Col4 = Calculate._RPMajmoSoodeGhest(p.OzviyatNumber)[0]
};
如您所见,对于Col3和Col4,我需要调用一个返回字符串数组的函数,其中string [1]用于Col3,string [0]用于Col4.
我想知道是否有任何方法可以调用Calculate._RPMajmoSoodeGhest()1次并将其用于Col3和Col4?
解决方法:
您可以使用“ let”来定义可在查询的“ select”部分中引用的数量:
var q = from p in m.TblOzvs.AsEnumerable()
where (p.OzviyatNumber == txtSearch.Text)
let calcVal = Calculate._RPMajmoSoodeGhest(p.OzviyatNumber)
select new mylist
{
Col1 = p.OzviyatNumber.ToString(),
Col2 = p.Name,
Col3 = calcVal[1],
Col4 = calcVal[0]
};
标签:global-variables,select,linq,c 来源: https://codeday.me/bug/20191028/1949794.html