Int64 Structure
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Int64 Structure

 

Represents a 64-bit signed integer.

Namespace:   System
Assembly:  mscorlib (in mscorlib.dll)

[SerializableAttribute]
[ComVisibleAttribute(true)]
public struct Int64 : IComparable, IFormattable, IConvertible, 
	IComparable<long>, IEquatable<long>

NameDescription
System_CAPS_pubmethodCompareTo(Int64)

Compares this instance to a specified 64-bit signed integer and returns an indication of their relative values.

System_CAPS_pubmethodCompareTo(Object)

Compares this instance to a specified object and returns an indication of their relative values.

System_CAPS_pubmethodEquals(Int64)

Returns a value indicating whether this instance is equal to a specified Int64 value.

System_CAPS_pubmethodEquals(Object)

Returns a value indicating whether this instance is equal to a specified object.(Overrides ValueType.Equals(Object).)

System_CAPS_pubmethodGetHashCode()

Returns the hash code for this instance.(Overrides ValueType.GetHashCode().)

System_CAPS_pubmethodGetType()

Gets the Type of the current instance.(Inherited from Object.)

System_CAPS_pubmethodGetTypeCode()

Returns the TypeCode for value type Int64.

System_CAPS_pubmethodSystem_CAPS_staticParse(String)

Converts the string representation of a number to its 64-bit signed integer equivalent.

System_CAPS_pubmethodSystem_CAPS_staticParse(String, IFormatProvider)

Converts the string representation of a number in a specified culture-specific format to its 64-bit signed integer equivalent.

System_CAPS_pubmethodSystem_CAPS_staticParse(String, NumberStyles)

Converts the string representation of a number in a specified style to its 64-bit signed integer equivalent.

System_CAPS_pubmethodSystem_CAPS_staticParse(String, NumberStyles, IFormatProvider)

Converts the string representation of a number in a specified style and culture-specific format to its 64-bit signed integer equivalent.

System_CAPS_pubmethodToString()

Converts the numeric value of this instance to its equivalent string representation.(Overrides ValueType.ToString().)

System_CAPS_pubmethodToString(IFormatProvider)

Converts the numeric value of this instance to its equivalent string representation using the specified culture-specific format information.

System_CAPS_pubmethodToString(String)

Converts the numeric value of this instance to its equivalent string representation, using the specified format.

System_CAPS_pubmethodToString(String, IFormatProvider)

Converts the numeric value of this instance to its equivalent string representation using the specified format and culture-specific format information.

System_CAPS_pubmethodSystem_CAPS_staticTryParse(String, Int64)

Converts the string representation of a number to its 64-bit signed integer equivalent. A return value indicates whether the conversion succeeded or failed.

System_CAPS_pubmethodSystem_CAPS_staticTryParse(String, NumberStyles, IFormatProvider, Int64)

Converts the string representation of a number in a specified style and culture-specific format to its 64-bit signed integer equivalent. A return value indicates whether the conversion succeeded or failed.

NameDescription
System_CAPS_pubfieldSystem_CAPS_staticMaxValue

Represents the largest possible value of an Int64. This field is constant.

System_CAPS_pubfieldSystem_CAPS_staticMinValue

Represents the smallest possible value of an Int64. This field is constant.

NameDescription
System_CAPS_pubinterfaceSystem_CAPS_privmethodIConvertible.ToBoolean(IFormatProvider)

This API supports the product infrastructure and is not intended to be used directly from your code. For a description of this member, see IConvertible.ToBoolean.

System_CAPS_pubinterfaceSystem_CAPS_privmethodIConvertible.ToByte(IFormatProvider)

This API supports the product infrastructure and is not intended to be used directly from your code. For a description of this member, see IConvertible.ToByte.

System_CAPS_pubinterfaceSystem_CAPS_privmethodIConvertible.ToChar(IFormatProvider)

This API supports the product infrastructure and is not intended to be used directly from your code. For a description of this member, see IConvertible.ToChar.

System_CAPS_pubinterfaceSystem_CAPS_privmethodIConvertible.ToDateTime(IFormatProvider)

This API supports the product infrastructure and is not intended to be used directly from your code. This conversion is not supported. Attempting to use this method throws an InvalidCastException.

System_CAPS_pubinterfaceSystem_CAPS_privmethodIConvertible.ToDecimal(IFormatProvider)

This API supports the product infrastructure and is not intended to be used directly from your code. For a description of this member, see IConvertible.ToDecimal.

System_CAPS_pubinterfaceSystem_CAPS_privmethodIConvertible.ToDouble(IFormatProvider)

This API supports the product infrastructure and is not intended to be used directly from your code. For a description of this member, see IConvertible.ToDouble.

System_CAPS_pubinterfaceSystem_CAPS_privmethodIConvertible.ToInt16(IFormatProvider)

This API supports the product infrastructure and is not intended to be used directly from your code. For a description of this member, see IConvertible.ToInt16.

System_CAPS_pubinterfaceSystem_CAPS_privmethodIConvertible.ToInt32(IFormatProvider)

This API supports the product infrastructure and is not intended to be used directly from your code. For a description of this member, see IConvertible.ToInt32.

System_CAPS_pubinterfaceSystem_CAPS_privmethodIConvertible.ToInt64(IFormatProvider)

This API supports the product infrastructure and is not intended to be used directly from your code. For a description of this member, see IConvertible.ToInt64.

System_CAPS_pubinterfaceSystem_CAPS_privmethodIConvertible.ToSByte(IFormatProvider)

This API supports the product infrastructure and is not intended to be used directly from your code. For a description of this member, see IConvertible.ToSByte.

System_CAPS_pubinterfaceSystem_CAPS_privmethodIConvertible.ToSingle(IFormatProvider)

This API supports the product infrastructure and is not intended to be used directly from your code. For a description of this member, see IConvertible.ToSingle.

System_CAPS_pubinterfaceSystem_CAPS_privmethodIConvertible.ToType(Type, IFormatProvider)

This API supports the product infrastructure and is not intended to be used directly from your code. For a description of this member, see IConvertible.ToType.

System_CAPS_pubinterfaceSystem_CAPS_privmethodIConvertible.ToUInt16(IFormatProvider)

This API supports the product infrastructure and is not intended to be used directly from your code. For a description of this member, see IConvertible.ToUInt16.

System_CAPS_pubinterfaceSystem_CAPS_privmethodIConvertible.ToUInt32(IFormatProvider)

This API supports the product infrastructure and is not intended to be used directly from your code. For a description of this member, see IConvertible.ToUInt32.

System_CAPS_pubinterfaceSystem_CAPS_privmethodIConvertible.ToUInt64(IFormatProvider)

This API supports the product infrastructure and is not intended to be used directly from your code. For a description of this member, see IConvertible.ToUInt64.

System_CAPS_noteNote

To view the .NET Framework source code for this type, see the Reference Source. You can browse through the source code online, download the reference for offline viewing, and step through the sources (including patches and updates) during debugging; see instructions.

Int64 is an immutable value type that represents signed integers with values that range from negative 9,223,372,036,854,775,808 (which is represented by the Int64.MinValue constant) through positive 9,223,372,036,854,775,807 (which is represented by the Int64.MaxValue constant. The .NET Framework also includes an unsigned 64-bit integer value type, UInt64, which represents values that range from 0 to 18,446,744,073,709,551,615.

You can instantiate an Int64 value in several ways:

  • You can declare an Int64 variable and assign it a literal integer value that is within the range of the Int64 data type. The following example declares two Int64 variables and assigns them values in this way.

    long number1 = -64301728;
    long number2 = 255486129307;
    
  • You can assign the value of an integral type whose range is a subset of the Int64 type. This is a widening conversion that does not require a cast operator in C# or a conversion method in Visual Basic.

    sbyte value1 = 124;
    short value2 = 1618;
    int value3 = Int32.MaxValue;
    
    long number1 = value1;
    long number2 = value2;
    long number3 = value3;
    
  • You can assign the value of a numeric type whose range exceeds that of the Int64 type. This is a narrowing conversion, so it requires a cast operator in C# and a conversion method in Visual Basic if OptionStrict is on. If the numeric value is a Single, Double, or Decimal value that includes a fractional component, the handling of its fractional part depends on the compiler performing the conversion. The following example performs narrowing conversions to assign several numeric values to Int64 variables.

    ulong ulNumber = 163245617943825;
    try {
       long number1 = (long) ulNumber;
       Console.WriteLine(number1);
    }
    catch (OverflowException) {
       Console.WriteLine("{0} is out of range of an Int64.", ulNumber);
    }
    
    double dbl2 = 35901.997;
    try {
       long number2 = (long) dbl2;
       Console.WriteLine(number2);
    }   
    catch (OverflowException) {
       Console.WriteLine("{0} is out of range of an Int64.", dbl2);
    }
    
    BigInteger bigNumber = (BigInteger) 1.63201978555e30;
    try {
       long number3 = (long) bigNumber;
       Console.WriteLine(number3);
    }
    catch (OverflowException) {
       Console.WriteLine("{0} is out of range of an Int64.", bigNumber);
    }    
    // The example displays the following output:
    //    163245617943825
    //    35902
    //    1,632,019,785,549,999,969,612,091,883,520 is out of range of an Int64.
    
  • You can call a method of the Convert class to convert any supported type to an Int64 value. This is possible because Int64 supports the IConvertible interface. The following example illustrates the conversion of an array of Decimal values to Int64 values.

    decimal[] values= { Decimal.MinValue, -1034.23m, -12m, 0m, 147m,
                        199.55m, 9214.16m, Decimal.MaxValue };
    long result;
    
    foreach (decimal value in values)
    {
       try {
          result = Convert.ToInt64(value);
          Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.",
                            value.GetType().Name, value,
                            result.GetType().Name, result);
       }
       catch (OverflowException) {
          Console.WriteLine("{0} is outside the range of the Int64 type.",
                            value);
       }   
    }                                  
    // The example displays the following output:
    //    -79228162514264337593543950335 is outside the range of the Int64 type.
    //    Converted the Decimal value '-1034.23' to the Int64 value -1034.
    //    Converted the Decimal value '-12' to the Int64 value -12.
    //    Converted the Decimal value '0' to the Int64 value 0.
    //    Converted the Decimal value '147' to the Int64 value 147.
    //    Converted the Decimal value '199.55' to the Int64 value 200.
    //    Converted the Decimal value '9214.16' to the Int64 value 9214.
    //    79228162514264337593543950335 is outside the range of the Int64 type.
    
  • You can call the Parse or TryParse method to convert the string representation of an Int64 value to an Int64. The string can contain either decimal or hexadecimal digits. The following example illustrates the parse operation by using both a decimal and a hexadecimal string.

    string string1 = "244681903147";
    try {
       long number1 = Int64.Parse(string1);
       Console.WriteLine(number1);
    }
    catch (OverflowException) {
       Console.WriteLine("'{0}' is out of range of a 64-bit integer.", string1);
    }
    catch (FormatException) {
       Console.WriteLine("The format of '{0}' is invalid.", string1);
    }
    
    string string2 = "F9A3CFF0A";
    try {
       long number2 = Int64.Parse(string2,
                                  System.Globalization.NumberStyles.HexNumber);
       Console.WriteLine(number2);
    }
    catch (OverflowException) {
       Console.WriteLine("'{0}' is out of range of a 64-bit integer.", string2);
    }
    catch (FormatException) {
       Console.WriteLine("The format of '{0}' is invalid.", string2);
    }
    // The example displays the following output:
    //    244681903147
    //    67012198154
    

The Int64 type supports standard mathematical operations such as addition, subtraction, division, multiplication, negation, and unary negation. Like the other integral types, the Int64 type also supports the bitwise AND, OR, XOR, left shift, and right shift operators.

You can use the standard numeric operators to compare two Int64 values, or you can call the CompareTo or Equals method.

You can also call the members of the Math class to perform a wide range of numeric operations, including getting the absolute value of a number, calculating the quotient and remainder from integral division, determining the maximum or minimum value of two long integers, getting the sign of a number, and rounding a number.

The Int64 type provides full support for standard and custom numeric format strings. (For more information, see Formatting Types in the .NET Framework, Standard Numeric Format Strings, and Custom Numeric Format Strings.)

To format an Int64 value as an integral string with no leading zeros, you can call the parameterless ToString() method. By using the "D" format specifier, you can also include a specified number of leading zeros in the string representation. By using the "N" format specifier, you can include group separators and specify the number of decimal digits to appear in the string representation of the number. By using the "X" format specifier, you can represent an Int64 value as a hexadecimal string. The following example formats the elements in an array of Int64 values in these four ways.

long[] numbers = { -1403, 0, 169, 1483104 };
foreach (var number in numbers) {
   // Display value using default formatting.
   Console.Write("{0,-8}  -->   ", number.ToString());
   // Display value with 3 digits and leading zeros.
   Console.Write("{0,8:D3}", number);
   // Display value with 1 decimal digit.
   Console.Write("{0,13:N1}", number);
   // Display value as hexadecimal.
   Console.Write("{0,18:X2}", number);
   // Display value with eight hexadecimal digits.
   Console.WriteLine("{0,18:X8}", number);
}   
// The example displays the following output:
//    -1403     -->      -1403     -1,403.0  FFFFFFFFFFFFFA85  FFFFFFFFFFFFFA85
//    0         -->        000          0.0                00          00000000
//    169       -->        169        169.0                A9          000000A9
//    1483104   -->    1483104  1,483,104.0            16A160          0016A160

You can also format an Int64 value as a binary, octal, decimal, or hexadecimal string by calling the ToString(Int64, Int32) method and supplying the base as the method's second parameter. The following example calls this method to display the binary, octal, and hexadecimal representations of an array of integer values.

long[] numbers = { -146, 11043, 2781913 };
foreach (var number in numbers) {
   Console.WriteLine("{0} (Base 10):", number);
   Console.WriteLine("   Binary:  {0}", Convert.ToString(number, 2));
   Console.WriteLine("   Octal:   {0}", Convert.ToString(number, 8));
   Console.WriteLine("   Hex:     {0}\n", Convert.ToString(number, 16));
}
// The example displays the following output:
//    -146 (Base 10):
//       Binary:  1111111111111111111111111111111111111111111111111111111101101110
//       Octal:   1777777777777777777556
//       Hex:     ffffffffffffff6e
//
//    11043 (Base 10):
//       Binary:  10101100100011
//       Octal:   25443
//       Hex:     2b23
//
//    2781913 (Base 10):
//       Binary:  1010100111001011011001
//       Octal:   12471331
//       Hex:     2a72d9

In addition to working with individual long integers as decimal values, you may want to perform bitwise operations with long integer values, or work with the binary or hexadecimal representations of long integer values. Int64 values are represented in 63 bits, with the sixty-fourth bit used as a sign bit. Positive values are represented by using sign-and-magnitude representation. Negative values are in two's complement representation. This is important to keep in mind when you perform bitwise operations on Int64 values or when you work with individual bits. In order to perform a numeric, Boolean, or comparison operation on any two non-decimal values, both values must use the same representation.

Universal Windows Platform
Available since 8
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1

All members of this type are thread safe. Members that appear to modify instance state actually return a new instance initialized with the new value. As with any other type, reading and writing to a shared variable that contains an instance of this type must be protected by a lock to guarantee thread safety.

System_CAPS_cautionCaution

Assigning an instance of this type is not thread safe on all hardware platforms because the binary representation of that instance might be too large to assign in a single atomic operation.

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