This short blog shows you how to fix the error System.ValueTuple is missing is Visual Studio.
You are happily type in the follow code into Visual Studio 2017.
class Program
{
static void Main(string[] args)
{
List<Order> orders = new List<Order> { new Order { orderId = 1, productId = 1, sales = 20f },
new Order {orderId=2, productId=2, sales = 30f},
new Order { orderId=3, productId=3, sales=40f} };
var t = GetOrders(orders);
Console.WriteLine(“Sum: {0}, Count: {1}”, t.Sum, t.Count);
}
static (float Sum, int Count) GetOrders(List<Order> orders)
{
var r = (s: 0f, c: 0);
foreach (Order od in orders)
{
r.s += od.sales;
r.c += 1;
}
return r;
}
}
class Order
{
public int orderId { get; set; }
public int productId { get; set; }
public float sales { get; set; }
}
When you build the code above you realized there is an error saying System.ValueTuples is missing and you have .NET Framework 4.6.2 running.
Visual Studio 2017 is no longer like the previous version .NET Framework 4.6.2 itself is insufficient for the new C# features. You need to download the Microsoft .NET Framework 4.6.2 Developer Pack https://www.microsoft.com/en-us/download/details.aspx?id=53321 in order to get your code build successfully.
