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。
用法:
public static float ToSingle (string value, IFormatProvider provider);
参数:
- value:它是一个包含要转换的数字的字符串。
- provider:它是提供区域性特定格式信息的对象。
返回值:此方法返回一个单精度浮点数,该数字等于value中的数字;如果value为null,则返回0(零)。
异常:
- FormatException:如果该值不包含一个可选的符号,后跟一个数字序列(0到9)。
- OverFlowException:如果该值表示一个小于MinValue或大于MaxValue的数字。
以下示例程序旨在说明Convert.ToSingle(String,IFormatProvider)方法的用法:
范例1:
// 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 intializing String array
string[] values = {"123.45", "+12.345",
"-1234.5"};
// calling get() Method
Console.Write("Converted float value"
+ " from a specified sttring ");
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);
}
}
输出:
Converted float value from a specified sttring 123.45, 12.345, -1234.5,
范例2:对于FormatException
// 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 intializing 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);
}
}
输出:
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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注:本文由纯净天空筛选整理自RohitPrasad3大神的英文原创作品 C# | Convert.ToSingle(String, IFormatProvider) Method。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。