Retrieve the two first elements that match a condition

Question

I'm sure that this can be easily done with Linq but I can't figure it out.

var ls1 = plotter.Model.Series.FirstOrDefault(x => x.IsSelected);
var ls2 = plotter.Model.Series.FirstOrDefault((x => x.IsSelected)&&(ls2!=ls1));

What I'm pretending to do is to obtain the two first objects that have their property IsSelected set to true.

I can't use the syntax written above because the compiler can't use "local variable ls2 before it is declared".

Answer 1

使用“位置”仅过滤所选结果，然后使用“ 获取”选择前两个，例如

plotter.Model.Series.Where(x => x.IsSelected).Take(2);

Answer 2

尝试这个：

var ls1and2 = plotter.Model.Series.Where(x => x.IsSelected).Take(2);

Answer 3

var ls1 = plotter.Model.Series.Where(x => x.IsSelected).Take(2);

Answer 4

您应该使用Take方法并执行此操作

var ls1 = plotter.Model.Series.Where(x => x.IsSelected).Take(2);