Represents a 64-bit signed integer.
Assembly: mscorlib (in mscorlib.dll)
Thetype exposes the following members.
|CompareTo(Int64)||Compares this instance to a specified 64-bit signed integer and returns an indication of their relative values.|
|CompareTo(Object)||Compares this instance to a specified object and returns an indication of their relative values.|
|Equals(Int64)||Returns a value indicating whether this instance is equal to a specified value.|
|Equals(Object)||Returns a value indicating whether this instance is equal to a specified object. (Overrides ValueType.Equals(Object).)|
|GetHashCode||Returns the hash code for this instance. (Overrides ValueType.GetHashCode().)|
|GetType||Gets the Type of the current instance. (Inherited from Object.)|
|GetTypeCode||Returns the TypeCode for value type .|
|Parse(String)||Converts the string representation of a number to its 64-bit signed integer equivalent.|
|Parse(String, NumberStyles)||Converts the string representation of a number in a specified style to its 64-bit signed integer equivalent.|
|Parse(String, IFormatProvider)||Converts the string representation of a number in a specified culture-specific format to its 64-bit signed integer equivalent.|
|Parse(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.|
|ToString()||Converts the numeric value of this instance to its equivalent string representation. (Overrides ValueType.ToString().)|
|ToString(IFormatProvider)||Converts the numeric value of this instance to its equivalent string representation using the specified culture-specific format information.|
|ToString(String)||Converts the numeric value of this instance to its equivalent string representation, using the specified format.|
|ToString(String, IFormatProvider)||Converts the numeric value of this instance to its equivalent string representation using the specified format and culture-specific format information.|
|TryParse(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.|
|TryParse(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.|
|IComparable.CompareTo||Compares 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.|
|IConvertible.ToBoolean||Infrastructure. For a description of this member, see IConvertible.ToBoolean.|
|IConvertible.ToByte||Infrastructure. For a description of this member, see IConvertible.ToByte.|
|IConvertible.ToChar||Infrastructure. For a description of this member, see IConvertible.ToChar.|
|IConvertible.ToDateTime||Infrastructure. This conversion is not supported. Attempting to use this method throws an InvalidCastException.|
|IConvertible.ToDecimal||Infrastructure. For a description of this member, see IConvertible.ToDecimal.|
|IConvertible.ToDouble||Infrastructure. For a description of this member, see IConvertible.ToDouble.|
|IConvertible.ToInt16||Infrastructure. For a description of this member, see IConvertible.ToInt16.|
|IConvertible.ToInt32||Infrastructure. For a description of this member, see IConvertible.ToInt32.|
|IConvertible.ToInt64||Infrastructure. For a description of this member, see IConvertible.ToInt64.|
|IConvertible.ToSByte||Infrastructure. For a description of this member, see IConvertible.ToSByte.|
|IConvertible.ToSingle||Infrastructure. For a description of this member, see IConvertible.ToSingle.|
|IConvertible.ToType||Infrastructure. For a description of this member, see IConvertible.ToType.|
|IConvertible.ToUInt16||Infrastructure. For a description of this member, see IConvertible.ToUInt16.|
|IConvertible.ToUInt32||Infrastructure. For a description of this member, see IConvertible.ToUInt32.|
|IConvertible.ToUInt64||Infrastructure. For a description of this member, see IConvertible.ToUInt64.|
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.
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 value in several ways:
You can declare an variable and assign it a literal integer value that is within the range of the data type. The following example declares two variables and assigns them values in this way.
You can assign the value of an integral type whose range is a subset of the type. This is a widening conversion that does not require a cast operator in C# or a conversion method in Visual Basic.
You can assign the value of a numeric type whose range exceeds that of the 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 variables.
You can call a method of the Convert class to convert any supported type to an value. This is possible because supports the IConvertible interface. The following example illustrates the conversion of an array of Decimal values to values.
You can call the Parse or TryParse method to convert the string representation of an value to an . 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.
Performing Operations on Int64 Values
The type supports standard mathematical operations such as addition, subtraction, division, multiplication, negation, and unary negation. Like the other integral types, the type also supports the bitwise AND, OR, XOR, left shift, and right shift operators.
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 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 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 value as a hexadecimal string. The following example formats the elements in an array of values in these four ways.
You can also format an 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.
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. 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 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 FrameworkSupported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1
.NET Framework Client ProfileSupported in: 4, 3.5 SP1
XNA FrameworkSupported in: 3.0, 2.0, 1.0
.NET for Windows Phone appsSupported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8
Portable Class LibrarySupported 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.
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.