caesar c# 输出数字而不是移位的字符

Question

为什么这个程序输出的是数字而不是移位的字符？我不明白这段代码有什么问题，我忘了添加什么？任何答案表示赞赏。

static void Main(string[] args) 
{  
    string key;
    string text = string.Empty;
    int int_key;

    Console.Write("Enter a key: ");
    key = Console.ReadLine();

    if(key == "2") 
    {
        Console.Write("String you want to encrypt: ");
        text = Console.ReadLine();
    }
    else 
    {
        Console.WriteLine("Please enter a valid key: ");
    }

    int_key = int.Parse(key);

    for(int i = 0; i < text.Length; i++) 
    {
        if(char.IsUpper(text[i])) 
        {
            Console.Write("Encrypted string: " + (((char)text[i] + int_key) - 65)% 26 + 65);
        }
        else 
        {
            Console.WriteLine("Encrypted string: " + (((char)text[i] + int_key) - 97)% 26 + 97);
        }
    }

    Console.ReadKey();  
}

Answer 1

Console.Write("Encrypted string: " + (((char)text[i] + int_key) - 65)% 26 + 65);

更有可能是：

Console.Write("Encrypted string: " + (char)(((text[i] + int_key) - 65)% 26 + 65));
//                                         |||_________________|     |         |
//                                         ||________________________|         |
//                                         |___________________________________|

caesar c# 输出数字而不是移位的字符

caesar c# outputs numbers instead of shifted characters

c#

windows

caesar-cipher