c＃如何累加受保护数组的总数

for(x= 0; x < InputOrder.Length; ++x){
Console.WriteLine(\"Total is ${0}\", InputOrder[x].TotalPrice++);

Console.WriteLine(\"Total is ${0}\", 
 (InputOrder[0].TotalPrice + 
  InputOrder[1].TotalPrice + 
  InputOrder[2].TotalPrice + 
  InputOrder[3].TotalPrice + 
  InputOrder[4].TotalPrice));

int total = 0;
for(x= 0; x < InputOrder.Length; ++x){
    total += InputOrder[x].TotalPrice;

Console.WriteLine(\"Total is ${0}\", total);

Console.WriteLine(\"Total is ${0}\", InputOrder.Sum(item => item.TotalPrice));

Console.WriteLine(\"Total is ${0}\", InputOrder.Sum(x=>x.TotalPrice));