C# Convert.ToByte(String, IFormatProvider)用法及代碼示例

此方法用於使用指定的區域性特定格式信息將數字的指定字符串表示形式轉換為等效的8位無符號整數。

用法:

public static byte ToByte (string value, IFormatProvider provider);

參數：

value:它是一個包含要轉換的數字的字符串。
provider:它是提供區域性特定格式信息的對象。

返回值：此方法返回一個與value等效的8位無符號整數，如果value為null，則返回零。

異常：

FormatException：如果該值不包含一個可選的符號，後跟一個數字序列(0到9)。
OverflowException：如果該值表示一個小於MinValue或大於MaxValue的數字。

以下示例程序旨在說明Convert.ToByte(String，IFormatProvider)方法的用法：

範例1：

// C# program to demonstrate the 
// Convert.ToByte() 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 = { "234", "+234", "240",  
                           "255", "140", "120" }; 
  
        // calling get() Method 
        Console.WriteLine("Converted bool value "+ 
                        "of specified strings:"); 
                          
        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 bool 
    byte val = Convert.ToByte(s, cultures); 
  
    // display the converted string 
    Console.Write(" {0}, ", val); 
} 
}

輸出：

Converted bool value of specified strings:
 234,  234,  240,  255,  140,  120,

範例2：對於FormatException

// C# program to demonstrate the 
// Convert.ToByte() 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 = {"234", "+234", "240", 
                             "255", "140", "A"}; 
  
        // calling get() Method 
        Console.WriteLine("]n Converted bool value "+ 
                           "of specified strings:"); 
                             
        for (int j = 0; j < values.Length; j++) { 
            get(values[j], cultures); 
        } 
    } 
      
    catch (FormatException e) { 
          
        Console.WriteLine("\n\nvalue consist invalid format"); 
        Console.Write("Exception Thrown:"); 
        Console.Write("{0}", e.GetType(), e.Message); 
    } 
      
    catch (OverflowException e) { 
          
        Console.WriteLine("\n value represents a "+ 
              "number that is less than MinValue"); 
                
        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 bool 
    byte val = Convert.ToByte(s, cultures); 
  
    // display the converted string 
    Console.Write(" {0}, ", val); 
} 
}

輸出：

]n Converted bool value of specified strings:
 234,  234,  240,  255,  140, 

value consist invalid format
Exception Thrown:System.FormatException

範例3：對於OverflowException

// C# program to demonstrate the 
// Convert.ToByte() 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 = {"234", "+234", "240", 
                           "255", "140", "-1" }; 
  
        // calling get() Method 
        Console.WriteLine("]n Converted bool value"+ 
                         " of specified strings:"); 
                           
        for (int j = 0; j < values.Length; j++) { 
            get(values[j], cultures); 
        } 
    } 
      
    catch (FormatException e) { 
          
        Console.WriteLine("\n\nvalue consist invalid format"); 
        Console.Write("Exception Thrown:"); 
        Console.Write("{0}", e.GetType(), e.Message); 
    } 
      
    catch (OverflowException e) { 
          
        Console.WriteLine("\n\nvalue represents a number"+ 
                           " that is less than MinValue"); 
        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 bool 
    byte val = Convert.ToByte(s, cultures); 
  
    // display the converted string 
    Console.Write(" {0}, ", val); 
} 
}

輸出：

]n Converted bool value of specified strings:
 234,  234,  240,  255,  140, 

value represents a number that is less than MinValue
Exception Thrown:System.OverflowException

參考：

https://docs.microsoft.com/en-us/dotnet/api/system.convert.tobyte?view=netframework-4.7.2#System_Convert_ToByte_System_String_System_IFormatProvider_

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