有条件的LINQ ToArray（）

Question

Given the following dataset:

WharehouseId    Sku     OnHold      InStock 
===========================================
1               ABC-123     N           20
2               ABC-123     N           13
3               ABC-123     Y           4
4               ABC-123     N           18

I need to create an int[] array that returns the InStock items, but the value should be 0 if OnHold equals 'Y' . So in the dataset above, the array result should be:

{ 20, 13, 0, 18 }

I am able to accomplish this by the following:

int[] inStockQty = new int[4];
int i = 0;

foreach (var item in query)
{
    inStockQty[i] = item.OnHold == 'N' ? item.InStock : 0;
    i++;
}

But I'm wondering if there is also a way to do this using LINQ's ToArray() ?

Answer 1

您可以将条件移到LINQ的Select ，如下所示：

var inStockQty = query.Select(item => item.OnHold == 'N' ? item.InStock : 0).ToArray();