Single.ToString()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。此方法的重载列表中有4种方法,如下所示:
- ToString(String)方法
- ToString()方法
- ToString(IFormatProvider)方法
- ToString(String,IFormatProvider)方法
在这里,我们将讨论前两种方法。
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 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
// Single.ToString(String) Method
using System;
class GFG {
// Main Method
public static void Main()
{
try {
// Declaring and initializing value
float value = 565998.1564f;
// 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 5.6600E+005
示例2:对于FormatException
// C# program to demonstrate the
// Single.ToString(String) Method
using System;
class GFG {
// Main Method
public static void Main()
{
try {
// Declaring and initializing value
float value = 1623325.62412f;
// 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
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 this instance.
下面的程序说明了Single.ToString()方法的用法:
范例1:
// C# program to demonstrate the
// Single.ToString() Method
using System;
class GFG {
// Main Method
public static void Main()
{
// Declaring and initializing value
float value = 792759354.39503305f;
// using ToString() method
string res = value.ToString();
// Display the value
Console.WriteLine("String value is {0}", res);
}
}
输出:
String value is 7.927594E+08
范例2:
// C# program to demonstrate the
// Single.ToString() Method
using System;
using System.Globalization;
class GFG {
// Main Method
public static void Main()
{
// calling get() method
get(Single.MaxValue);
get(Single.MinValue);
get(40f);
get(424967295.5858f);
}
// defining get() method
public static void get(float value)
{
// using ToString() method
string res = value.ToString();
// Display the value
Console.WriteLine("String value is {0}", res);
}
}
输出:
String value is 3.402823E+38
String value is -3.402823E+38
String value is 40
String value is 4.249673E+08
参考:
- https://docs.microsoft.com/zh-cn/dotnet/api/system.single.tostring?view=netstandard-2.1