C# C# | Convert。ToUInt64(字符串，表单提供者)方法

C# | Convert。ToUInt64(字符串，表单提供者)方法

原文:https://www . geesforgeks . org/c-sharp-convert-touint64 string-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 64 位无符号整数。

语法:

public static ulong ToUInt64 (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 64 位无符号整数，该整数等于值中的数字，如果值为空，则返回 0(零)。

异常:

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:

例 1:

// C# program to demonstrate the
// Convert.ToUInt64() 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 = {"123456789012",
                           "+123456789012", 
                   "18446744073709551615"};

        // calling get() Method
        Console.WriteLine("Converted ulong 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 ulong
    ulong val = Convert.ToUInt64(s, cultures);

    // display the converted ulong value
    Console.Write(" {0}, ", val);
}
}

Output:

Converted ulong value from a specified string 
 123456789012,  123456789012,  18446744073709551615,

例 2: 为格式异常

// C# program to demonstrate the
// Convert.ToUInt64() 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 = {"123456789012",
                           "+123456789012", 
                   "18446744073709551615"};

        // calling get() Method
        Console.WriteLine("Converted ulong 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 ulong
        long val = Convert.ToInt64(s, cultures);

        // display the converted ulong 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 ulong value
    ulong val = Convert.ToUInt64(s, 
                         cultures);

    // display the converted
    // ulong value
    Console.Write(" {0}, ", val);
}
}

Output:

Converted ulong value of specified strings: 
 123456789012,  123456789012,  18446744073709551615, 

format of s is invalid 
Exception Thrown: System.FormatException

例 3: 适用于飞越异常

// C# program to demonstrate the
// Convert.ToUInt64() 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 = {"123456789012",
                          "+123456789012", 
                  "18446744073709551615"};

        // calling get() Method
        Console.WriteLine("Converted ulong 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 ulong
        ulong val = Convert.ToUInt64(s, cultures);

        // display the converted ulong 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 ulong value
    ulong val = Convert.ToUInt64(s, cultures);

    // display the converted ulong value
    Console.Write(" {0}, ", val);
}
}

Output:

Converted ulong value of specified strings: 
 123456789012,  123456789012,  18446744073709551615, 

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

参考: