C# | Convert。ToSingle(字符串,表单提供者)方法
原文:https://www . geesforgeks . org/c-sharp-convert-to singlestring-iformatprovider-method/
此方法用于使用指定的区域性特定格式信息,将数字的指定字符串表示形式转换为等效的单精度浮点数。 语法:
public static float ToSingle (string value, IFormatProvider provider);
参数:
- 值:是包含要转换的数字的字符串。
- 提供程序:它是一个提供区域性特定格式信息的对象。
返回值:该方法返回一个单精度浮点数,该浮点数与值中的数字相等,如果值为空,则返回 0(零)。 T3】例外:
- 格式异常:如果值不是由后跟数字序列(0 到 9)的可选符号组成。
- overoverowexception:如果值代表小于最小值或大于最大值的数字。
以下程序说明了转换的使用。方法: T3】例 1:
c sharp . c sharp . c sharp . c sharp
// C# program to demonstrate the
// Convert.ToSingle() Method
using System;
using System.Globalization;
class GFG {
// Main Method
public static void Main()
{
try {
// creating object of CultureInfo
CultureInfo cultures = new CultureInfo("en-US");
// declaring and initializing String array
string[] values = {"123.45", "+12.345",
"-1234.5"};
// calling get() Method
Console.Write("Converted float value"
+ " from a specified string ");
for (int j = 0; j < values.Length; j++)
{
get(values[j], cultures);
}
}
catch (FormatException e)
{
Console.WriteLine("\n");
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
catch (OverflowException e)
{
Console.WriteLine("\n");
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
}
// Defining get() method
public static void get(string s,
CultureInfo cultures)
{
// converting string to specified float
float val = Convert.ToSingle(s, cultures);
// display the converted float value
Console.Write(" {0}, ", val);
}
}
Output
Converted float value from a specified string 123.45, 12.345, -1234.5,
例 2: 为格式异常
c sharp . c sharp . c sharp . c sharp
// C# program to demonstrate the
// Convert.ToSingle() Method
using System;
using System.Globalization;
class GFG {
// Main Method
public static void Main()
{
try {
// creating object of CultureInfo
CultureInfo cultures = new CultureInfo("en-US");
// declaring and initializing String array
string[] values = {"12.345", "+1234.5",
"-123.45"};
// calling get() Method
Console.Write("Converted float value"
+ " of specified strings: ");
for (int j = 0; j < values.Length; j++)
{
get(values[j], cultures);
}
Console.WriteLine("\n");
string s = "123 456, 789";
Console.WriteLine("format of s is invalid ");
// converting string to specified float
float val = Convert.ToSingle(s, cultures);
// display the converted float value
Console.Write(" {0}, ", val);
}
catch (FormatException e)
{
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
catch (OverflowException e)
{
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
}
// Defining get() method
public static void get(string s,
CultureInfo cultures)
{
// converting string to
// specified float value
float val = Convert.ToSingle(s, cultures);
// display the converted
// float value
Console.Write(" {0}, ", val);
}
}
Output:
Converted float value of specified strings: 12.345, 1234.5, -123.45,
format of s is invalid
Exception Thrown: System.FormatException
参考:
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