使用 Excel-Dna 進行鏈式函數調用

Question

是否可以使用 Excel-Dna 鏈接函數調用？

我正在嘗試從 Excel Sheet 中調用類似的東西：

=CreateAccount(CreateUser("John","Doe"))

但是內部函數CreateUser返回ExcelErrorValue 。

演示 C# 代碼如下所示：

namespace ExcelDnaDemo
{
    using ExcelDna.Integration;

    public static class MyFunctions
    {
        [ExcelFunction(Description = "C-U")]
        public static object CreateUser(string firstName, string lastName)
        {
            return new User(firstName, lastName);
        }

        [ExcelFunction(Description = "C-A")]
        public static string CreateAccount(
            [ExcelArgument(
                Name = "Usr",
                Description = "User test", AllowReference = true)]
            object user)
        {
            var a = new Account(user);
            return $"{a.User.FirstName} {a.User.LastName} {a.Id}";
        }
    }

    public class User
    {
        public User(string firstName, string lastName)
        {
            FirstName = firstName;
            LastName = lastName;
        }
        public string FirstName { get; set; }
        public string LastName { get; set; }
    }

    public class Account
    {
        public object User { get; private set; }
        public Guid Id { get; private set; }
        public Account(object user)
        {
            User = user;
            Id = Guid.NewGuid();
        }
    }
}

Answer 1

您可以將新用戶添加到內部Dictionary<string, User>並從CreateUser函數返回某種鍵，例如“User:1”。 然后在CreateAccount您接收字符串鍵，並檢查它是否存在於字典中以檢索緩存的User對象。