如何使用泛型添加整数和字符串数组

问题描述

在下面的代码中，我想执行int数组的泛型添加以及字符串数组的添加。

所以如何通过使用泛型实现这一点。

In the below code I want to perform the generics add of int array as well as add of string array.
so how to achieve this by using generics.

class Program
    {
        static void Main(string[] args)
        {
            int[] x = new int[] { 10, 20, 30, 40 };
            string[] y = new string[] { "Himanshu", "Panjabi" };
            ArrayCalc<int> ac1 = new ArrayCalc<int>();
            int r1 = ac1.Add(x);

            Console.WriteLine(r1);
            //ArrayCalc<string> ac2=new ArrayCalc<string>();
            //string r2=ac2.Add(y);

            //int[] a = new int[] { 2, 4, 6, 8, 10 };
            //int res = a.Sum();
            //Console.WriteLine(res);
            Console.ReadLine();
        }
    }
    public class ArrayCalc<T> where T : IComparable
    {
        public T Add(T[] t1)
        {
            T t3 = default(T);
            if (t1 is int[])
            {
                int[] num = new int[10];
                int res = Convert.ToInt32(num.Sum());
                //int asum=num.Sum();
                //int num1 =Convert.ToInt32(t1);
                // int num2 = Convert.ToInt32(t2);
                //int res = num1;
                T files = (T)System.Convert.ChangeType(res, typeof(T));
                return files;
            }
            //else if (t1 is string)
            //{
            //    return (T)System.Convert.ChangeType(x, typeof(T));
            //}
            else
                return (T)System.Convert.ChangeType(t3, typeof(T));


        }

推荐答案

public T Add(T[] t1)
       {
           T t3 = default(T);
           if (t1 is int[])
           {
               int[] temp = t1 as int[];
               int[] num = new int[10];
               var res = temp.Sum();

using System;
using System.Linq;
					
public class Program
{
    public static void Main()
    {
        int[] integers = new int[] { 10, 20, 30, 40 };
        string[] strings = new string[] { "Himanshu", "Panjabi" };

        ArrayCalc<int> calcInt = new ArrayCalc<int>();
        int sum = calcInt.Add(integers);
        Console.WriteLine(sum);

        ArrayCalc<string> calcString = new ArrayCalc<string>();
        string joined = calcString.Add(strings);
        Console.WriteLine(joined);
    }

    public class ArrayCalc<T>
    {
        public T Add(T[] array)
        {
            if (array is int[])
            {
                int[] numbers = array as int[];
                int sum = numbers.Sum();
                return (T)(object)sum;       // <-- UGLY!
            }
            else if (array is string[])
            {
                string[] strings = array as string[];
                string joined = String.Join("", strings);
                return (T)(object)joined;    // <-- UGLY!
            }
            else
                throw new NotSupportedException("can't add " + typeof(T).Name);
        }
    }
}

控制台输出：

Console-output:

100
HimanshuPanjabi

正如UGLY！所示，这种错误使用（说实话）你的泛型基于泛型类型进行大小写区分也会导致对泛型类型 T 进行必要的丑陋反向转换，以便能够在没有编译器抱怨的情况下返回结果。

As indicated by "UGLY!", this mis-use (to be honest) of generics where you make case-distinctions based on the generic type also leads to neccessary ugly reverse-casts to the generic type T in order to be able to return the result without the compiler complaining about it.

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