System.ValueTuple is missing

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.

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About chanmingman

Since March 2011 Microsoft Live Spaces migrated to Wordpress (http://www.pcworld.com/article/206455/Microsoft_Live_Spaces_Moves_to_WordPress_An_FAQ.html) till now, I have is over 1 million viewers. This blog is about more than 50% telling you how to resolve error messages, especial for Microsoft products. The blog also has a lot of guidance teaching you how to get stated certain Microsoft technologies. The blog also uses as a help to keep my memory. The blog is never meant to give people consulting services or silver bullet solutions. It is a contribution to the community. Thanks for your support over the years. Ming Man is Microsoft MVP since year 2006. He is a software development manager for a multinational company. With 25 years of experience in the IT field, he has developed system using Clipper, COBOL, VB5, VB6, VB.NET, Java and C #. He has been using Visual Studio (.NET) since the Beta back in year 2000. He and the team have developed many projects using .NET platform such as SCM, and HR based applications. He is familiar with the N-Tier design of business application and is also an expert with database experience in MS SQL, Oracle and AS 400.
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