C＃| Decimal.ToString方法|设置-1

Decimal.ToString()方法用于使用指定的区域性特定格式信息将当前实例的数值转换为其等效的字符串表示形式。此方法的重载列表中有4种方法，如下所示：

• ToString()方法
• ToString(IFormatProvider)方法
• ToString(String，IFormatProvider)方法
• ToString(String)方法

在这里，我们将讨论前两种方法。

ToString()方法

此方法用于将当前实例的数值转换为其等效的字符串表示形式。

Syntax: public override string ToString ();

Return Value: This method returns a string which represents the value of the current instance.

下面的程序说明了Decimal.ToString()方法的用法：

范例1：

// C# program to demonstrate the
// Decimal.ToString() Method
using System;
  
class GFG {
  
    // Main Method
    public static void Main()
    {
  
        // Declaring and initializing value
        decimal value = 7922816251426433759354.39503305M;
  
        // using ToString() method
        string str = value.ToString();
  
        // Display the value
        Console.WriteLine("String value is {0}", str);
    }
}

输出：

String value is 7922816251426433759354.3950330

范例2：

// C# program to demonstrate the
// Decimal.ToString() Method
using System;
using System.Globalization;
  
class GFG {
  
    // Main Method
    public static void Main()
    {
        // calling get() method
        Console.WriteLine("Equivalent String values are:");
        get(20);
        get(30);
        get(40);
        get(4294967295);
    }
  
    // defining get() method
    public static void get(decimal value)
    {
  
        // using ToString() method
        string str = value.ToString();
  
        // Display the value
        Console.WriteLine("String value is {0}", str);
    }
}

输出：

Equivalent String values are:
String value is 20
String value is 30
String value is 40
String value is 4294967295

ToString(String)方法

此方法用于使用指定格式将当前实例的数值转换为其等效的字符串表示形式。

Syntax: public string ToString (string format);
Here, it takes a standard or custom numeric format string.

Return Value: This method returns the string representation of the value of the current instance as specified by format.

Exceptions: This method throws FormatException if format is invalid.

范例1：

// C# program to demonstrate the
// Decimal.ToString(String) Method
using System;
  
class GFG {
  
    // Main Method
    public static void Main()
    {
        try {
  
            // Declaring and initializing value
            decimal value = 16325.62m;
  
            // Declaring and initializing format
            string s = "E04";
  
            // using the method
            string str = value.ToString(s);
  
            // Display the value
            Console.WriteLine("String value is {0}", str);
        }
  
        catch (FormatException e) 
        {
            Console.WriteLine("Format is invalid.");
            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
    }
}

输出：

String value is 1.6326E+004

示例2：对于FormatException

// C# program to demonstrate the
// Decimal.ToString(String) Method
using System;
  
class GFG {
  
    // Main Method
    public static void Main()
    {
        try {
  
            // Declaring and initializing value
            decimal value = 16325.62m;
  
            // Declaring and initializing format
            string s = "a";
  
            // using the method
            string str = value.ToString(s);
  
            // Display the value
            Console.WriteLine("String value is {0}", str);
        }
  
        catch (FormatException e) 
        {
            Console.WriteLine("Format is invalid.");
            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
    }
}

输出：

Format is invalid.
Exception Thrown: System.FormatException

参考：

• https://docs.microsoft.com/zh-cn/dotnet/api/system.decimal.tostring?view=netframework-4.7.2