C# 中的美元金额

Question

我浏览了其他一些帖子，但似乎没有任何帮助。所以我想要得到的是一个代码，它可以读出当前余额，前面有一个短语，还有一个美元金额。与其打印美元符号，不如打印 {0:C}。我是不是用错了{0:C}？

namespace ConsoleApplication7
{
    class Program
    {
        static void Main(string[] args)
        {
            double TotalAmount;
            TotalAmount = 300.7 + 75.60;
            string YourBalance = "Your account currently contains this much money: {0:C} " + TotalAmount;
            Console.WriteLine(YourBalance);
            Console.ReadLine();
        }
    }
}

Answer 1

Am I using {0:C} incorrectly?

是的，你是。您只是连接字符串和 TotalAmount。因此，即使您使用货币格式说明符 ({0:C})，货币金额也不会替换说明符。

你需要使用String.Format()，像这样：

string YourBalance = String.Format("Your account currently contains this much money: {0:C}", TotalAmount);

Answer 2

string YourBalance = 
    string.Format("Your account currently contains this much money: {0:C} ",TotalAmount);

或在 C# 6.0+ 中使用字符串插值

string YourBalance = $"Your account currently contains this much money: {TotalAmount:C} ";

Answer 3

你非常接近！您需要使用 string.Format():

string YourBalance = string.Format(
    "Your account currently contains this much money: {0:C} ", TotalAmount);

{0:C} 语法在 Format 方法的上下文之外没有任何意义。

这是您示例中的有效 fiddle：Fiddle

Answer 4

你可以使用这个...

using System.Globalization;

namespace ConsoleApplication
{
   class Program
   {
       static void Main(string[] args)
       {
            double TotalAmount;
            TotalAmount = 300.7 + 75.60;
            string YourBalance = "Your account currently contains this much money: " +
                           string.Format(new CultureInfo("en-US"), "{0:C}",TotalAmount);
            Console.WriteLine(YourBalance);
            Console.ReadLine();
        }
    }
}

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