Feature Recursive Patterns Is currently in Preview Version of Vs Code

Question

I am unable to use some piece of code introduced in c# version 8.0.

Consider this piece of code.

Property patterns

class Address
{

    public string State { get; set; }
}

public static decimal ComputeSalesTax(Address location, decimal salePrice) =>
location switch
{
    { State: "WA" } => salePrice * 0.06M,
    { State: "MN" } => salePrice * 0.75M,
    { State: "MI" } => salePrice * 0.05M,
    // other cases removed for brevity...
    _ => 0M
};

Error:

Please help me solve this , infact I am using latest version of vs code.

Answer 1

You need to tell VS Code that you want to use a newer (preview) language version of c#. Are you working on a project? If so you can put <LangVersion>preview</LangVersion> in the .csproj file. This might resolve the issue. You need to put it in the right place however.