C＃| Convert.ToSByte(String，IFormatProvider)方法

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8位带符号整数。

句法：

public static sbyte ToSByte (string value, IFormatProvider provider);

参数：

• value ：这是一个字符串，其中包含要转换的数字。
• provider ：提供者，它提供特定于区域性的格式信息。

返回值：该方法返回一个与value等效的8位有符号整数。

例外情况：

• ArgumentNullException：如果该值为null。
• 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。

下面的程序说明了Convert.ToSByte(String，IFormatProvider)方法的用法：

范例1：

// C# program to demonstrate the
// Convert.ToSByte() 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", "+123", "-123"};
  
        // calling get() Method
        Console.Write("Converted sbyte 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 sbyte
    sbyte val = Convert.ToSByte(s, cultures);
  
    // display the converted sbyte value
    Console.Write(" {0}, ", val);
}
}

输出：

Converted sbyte value from a specified string:  123,  123,  -123,

示例2：对于FormatException

// C# program to demonstrate the
// Convert.ToSByte() 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", "+123", "-123"};
  
        // calling get() Method
        Console.Write("Converted sbyte 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 sbyte
        sbyte val = Convert.ToSByte(s, cultures);
  
        // display the converted ToSByte 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 sbyte value
    sbyte val = Convert.ToSByte(s, cultures);
  
    // display the converted
    // sbyte value
    Console.Write(" {0}, ", val);
}
}

输出：

Converted sbyte value of specified strings:  123,  123,  -123, 

format of s is invalid
Exception Thrown: System.FormatException

示例3：对于OverflowException

// C# program to demonstrate the
// Convert.ToSByte() 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", "+123", "-123"};
  
        // calling get() Method
        Console.Write("Converted sbyte value "
                  + "of specified strings: ");
  
        for (int j = 0; j < values.Length; j++) 
        {
            get(values[j], cultures);
        }
  
        Console.WriteLine("\n");
        string s = "-7922816251426433759354395033500000";
  
        Console.WriteLine("s is less than the MinValue");
  
        // converting string to specified sbyte
        sbyte val = Convert.ToSByte(s, cultures);
  
        // display the converted sbyte 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 sbyte value
    sbyte val = Convert.ToSByte(s, cultures);
  
    // display the converted sbyte value
    Console.Write(" {0}, ", val);
}
}

输出：

Converted sbyte value of specified strings:  123,  123,  -123, 

s is less than the MinValue
Exception Thrown: System.OverflowException

参考：

• https://docs.microsoft.com/zh-cn/dotnet/api/system.convert.tosbyte?view=netframework-4.7.2#System_Convert_ToSByte_System_String_System_IFormatProvider_