Int64 Structure

Represents a 64-bit signed integer.

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

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

The Int64 type exposes the following members.

  NameDescription
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryCompareTo(Int64)Compares this instance to a specified 64-bit signed integer and returns an indication of their relative values.
Public methodSupported by the XNA FrameworkCompareTo(Object)Compares this instance to a specified object and returns an indication of their relative values.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryEquals(Int64)Returns a value indicating whether this instance is equal to a specified Int64 value.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryEquals(Object)Returns a value indicating whether this instance is equal to a specified object. (Overrides ValueType::Equals(Object).)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryGetHashCodeReturns the hash code for this instance. (Overrides ValueType::GetHashCode().)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodSupported by the XNA FrameworkGetTypeCodeReturns the TypeCode for value type Int64.
Public methodStatic memberSupported by the XNA FrameworkSupported by Portable Class LibraryParse(String)Converts the string representation of a number to its 64-bit signed integer equivalent.
Public methodStatic memberSupported by the XNA FrameworkSupported by Portable Class LibraryParse(String, NumberStyles)Converts the string representation of a number in a specified style to its 64-bit signed integer equivalent.
Public methodStatic memberSupported by Portable Class LibraryParse(String, IFormatProvider)Converts the string representation of a number in a specified culture-specific format to its 64-bit signed integer equivalent.
Public methodStatic memberSupported by the XNA FrameworkSupported by Portable Class LibraryParse(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.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryToString()Converts the numeric value of this instance to its equivalent string representation. (Overrides ValueType::ToString().)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryToString(IFormatProvider)Converts the numeric value of this instance to its equivalent string representation using the specified culture-specific format information.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryToString(String)Converts the numeric value of this instance to its equivalent string representation, using the specified format.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibraryToString(String, IFormatProvider)Converts the numeric value of this instance to its equivalent string representation using the specified format and culture-specific format information.
Public methodStatic memberSupported by Portable Class LibraryTryParse(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.
Public methodStatic memberSupported by Portable Class LibraryTryParse(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.
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  NameDescription
Public fieldStatic memberSupported by the XNA FrameworkSupported by Portable Class LibraryMaxValueRepresents the largest possible value of an Int64. This field is constant.
Public fieldStatic memberSupported by the XNA FrameworkSupported by Portable Class LibraryMinValueRepresents the smallest possible value of an Int64. This field is constant.
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  NameDescription
Explicit interface implemetationPrivate methodSupported by Portable Class LibraryIComparable::CompareToCompares the current instance with another object of the same type and returns an integer that indicates whether the current instance precedes, follows, or occurs in the same position in the sort order as the other object.
Explicit interface implemetationPrivate methodSupported by the XNA FrameworkIConvertible::ToBooleanInfrastructure. For a description of this member, see IConvertible::ToBoolean.
Explicit interface implemetationPrivate methodSupported by the XNA FrameworkIConvertible::ToByteInfrastructure. For a description of this member, see IConvertible::ToByte.
Explicit interface implemetationPrivate methodSupported by the XNA FrameworkIConvertible::ToCharInfrastructure. For a description of this member, see IConvertible::ToChar.
Explicit interface implemetationPrivate methodSupported by the XNA FrameworkIConvertible::ToDateTimeInfrastructure. This conversion is not supported. Attempting to use this method throws an InvalidCastException.
Explicit interface implemetationPrivate methodSupported by the XNA FrameworkIConvertible::ToDecimalInfrastructure. For a description of this member, see IConvertible::ToDecimal.
Explicit interface implemetationPrivate methodSupported by the XNA FrameworkIConvertible::ToDoubleInfrastructure. For a description of this member, see IConvertible::ToDouble.
Explicit interface implemetationPrivate methodSupported by the XNA FrameworkIConvertible::ToInt16Infrastructure. For a description of this member, see IConvertible::ToInt16.
Explicit interface implemetationPrivate methodSupported by the XNA FrameworkIConvertible::ToInt32Infrastructure. For a description of this member, see IConvertible::ToInt32.
Explicit interface implemetationPrivate methodSupported by the XNA FrameworkIConvertible::ToInt64Infrastructure. For a description of this member, see IConvertible::ToInt64.
Explicit interface implemetationPrivate methodSupported by the XNA FrameworkIConvertible::ToSByteInfrastructure. For a description of this member, see IConvertible::ToSByte.
Explicit interface implemetationPrivate methodSupported by the XNA FrameworkIConvertible::ToSingleInfrastructure. For a description of this member, see IConvertible::ToSingle.
Explicit interface implemetationPrivate methodSupported by the XNA FrameworkIConvertible::ToTypeInfrastructure. For a description of this member, see IConvertible::ToType.
Explicit interface implemetationPrivate methodSupported by the XNA FrameworkIConvertible::ToUInt16Infrastructure. For a description of this member, see IConvertible::ToUInt16.
Explicit interface implemetationPrivate methodSupported by the XNA FrameworkIConvertible::ToUInt32Infrastructure. For a description of this member, see IConvertible::ToUInt32.
Explicit interface implemetationPrivate methodSupported by the XNA FrameworkIConvertible::ToUInt64Infrastructure. For a description of this member, see IConvertible::ToUInt64.
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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.

Instantiating an Int64 Value

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.

    No code example is currently available or this language may not be supported.
  • 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.

    No code example is currently available or this language may not be supported.
  • 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 Option Strict 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.

    No code example is currently available or this language may not be supported.
  • 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.

    No code example is currently available or this language may not be supported.
  • 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.

    No code example is currently available or this language may not be supported.

Performing Operations on Int64 Values

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.

Representing an Int64 as a String

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.

No code example is currently available or this language may not be supported.

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.

No code example is currently available or this language may not be supported.

Working with Non-Decimal 32-Bit Integer Values

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.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Portable Class Library

Supported in: Portable Class Library

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.

Caution noteCaution

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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