[Solved] Linq – cast anonymous type to concrete type

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Simply create instances of the concrete type (there is no requirement to use an anonymous types in LINQ):

var suppliers = SupplierView.Select()
        .GroupBy(x => x.Name.Substring(0, 1).ToUpper(),
            (alphanumeric, suppliers) => new AlphanumericSuppliers // concrete
            {
                Alphanumeric = alphanumeric,
                Suppliers = suppliers.OrderBy(x => x.Name).ToList() // *
            })
        .OrderBy(x => x.Alphanumeric);

*As mentioned in comments, either change Suppliers to be IEnumerable<Supplier> or remove the ToList call from here

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solved Linq – cast anonymous type to concrete type