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Semantic versioning for .NET
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Semantic Versioning for .NET

Build status NuGet Version

This library implements the Semantic Versioning specification and the version range specifications used by npm (node-semver).


SemVer.NET is available as a NuGet package. To install it, run the following command in the Package Manager Console:

Install-Package SemanticVersioning

Quick Start

Use the SemVer namespace:

using SemVer;

Construct a range:

var range = new Range("~1.2.3");

Construct a version:

var version = new Version("1.2.4");

Test whether the version satisfies the range:

bool satisfied = range.IsSatisfied(version);
// satisfied = true

Filter a list of versions to select only those that satisfy a range:

var versions = new [] {
    new Version("1.2.1"),
    new Version("1.2.3"),
    new Version("1.2.8"),
    new Version("1.3.2"),
IEnumerable<Version> satisfyingVersions = range.Satisfying(versions);
// satisfyingVersions = 1.2.3, 1.2.8

Find the maximum version that satisfies a range:

Version selectedVersion = range.MaxSatisfying(versions);
// selectedVersion = 1.2.8

To get the original input string used when constructing a version, use Version.ToString().


SemVer.NET range specifications match the range specifications used by node-semver.

A range specification is constructed by combining multiple comparator sets with ||, where the range is satisfied if any of the comparator sets are satisfied.

A comparator set is a combination of comparators, where all comparators must be satisfied for a comparator set to be satisfied.

A comparator is made up of an operator and a version. An operator is one of: =, >, >=, <, or <=. For example, the comparator >=1.2.3 specifies versions greater than or equal to 1.2.3.

An example of a range is >=1.2.3 <1.3.0 || =1.3.2, which is satisfied by 1.2.3, 1.2.99, and 1.3.2, but not 1.3.0.

Advanced Ranges

Ranges can also be specified using advanced range specification strings, which desugar into comparator sets.

Hyphen Ranges

A hyphen range specifies an inclusive range of valid versions, for example 1.2.3 - 1.4.2 is equivalent to >=1.2.3 <=1.4.2.


A partial version string, or a version string with components replaced by an X or a * matches any version where the specified components match.

For example, 1.2.x is satisfied by 1.2.0 and 1.2.99, but not 1.3.0.

Tilde Ranges

When a minor version is specified, a tilde range only allows changes in the patch version. Otherwise if only the major version is specified, only changes in the minor version are allowed.


  • ~1.2.3 is equivalent to >=1.2.3 < 1.3.0
  • ~1.2 is equivalent to >=1.2.0 < 1.3.0
  • ~1 is equivalent to >=1.0.0 < 2.0.0

Caret Ranges

A caret range allows versions where the most significant non-zero version component does not change.


  • ^1.2.3 is equivalent to >=1.2.3 < 2.0.0
  • ^0.2.3 is equivalent to >=0.2.3 < 0.3.0
  • ^0.0.3 is equivalent to >=0.0.3 < 0.0.4

Pre-Release Versions

Versions with a pre-release can only satisfy ranges that contain a comparator with a pre-release version, and the comparator version's major, minor and patch components must match those of the version being tested.

var range = new Range(">=1.2.3-beta.2");
range.IsSatisfied("1.2.3-beta.3");  // true
range.IsSatisfied("1.2.3-alpha");   // false
range.IsSatisfied("1.2.3");         // true
range.IsSatisfied("1.2.4");         // true
range.IsSatisfied("1.2.4-beta.5");  // false

var range2 = new Range(">=1.2.3");
range2.IsSatisfied("1.2.4-alpha");  // false

Version Comparisons

Version objects implement IEquatable<Version> and IComparable<Version>, and can also be compared using ==, >, >=, <, <= and !=.

var a = new Version("1.2.3");
var b = new Version("1.3.0");
a == b;  // false
a != b;  // true
a > b;   // false
a < b;   // true
a <= b;  // true

Usage Notes

The Range and Version constructors will throw an ArgumentException when an invalid range or version string is used. These constructors and all methods that accept versions as a string have an optional loose parameter, which will allow some invalid version formats. For example, a pre-release version without a leading hyphen will be allowed when loose = true.

var version = new Version("1.2.3alpha");       // Throws ArgumentException
var version = new Version("1.2.3alpha", true); // No exception thrown

The Range class contains separate methods that accept versions either as strings or as Version objects. When passing versions as a string to range methods, invalid version strings will act as if the version does not satisfy the range, but no exception will be thrown. Therefore, if you want to know when a version string is invalid, you should construct Version objects and check for an ArgumentException.

var range = new Range("~1.2.3");
// Returns false:
// Version constructor throws ArgumentException:
range.IsSatisfied(new Version("banana"));

For convenience, static methods of the Range class are provided that accept a range parameter as the first argument and accept versions as strings, so you don't have to construct any Range or Version objects if you just want to use one method:

// Returns 1.2.8:
        new [] {"1.2.1", "1.2.3", "1.2.8", "1.3.2"});
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