Conditions.NET

This is library that provides condition methods, thanks to which code we are writing is more verbose and clean. Currently it provides conditions for objects, strings, numerics, booleans, datatime and enumerables.

Available conditions:

Object:

IsNull
IsNotNull

String:

IsNullOrEmpty
IsNotNullOrEmpty
IsGuid
IsEmailAddress
HasLength
HasLengthAtLeast
Matches

Numerics:

IsGreaterThan
IsGreaterOrEqual
IsLowerThan
IsLowerOrEqual
IsBetween
IsPositive
IsNegative

DateTime:

IsGreaterThan

Boolean:

IsTrue
IsFalse

Enumerables:

IsEmpty
HasExactlyOneItem
HasMoreThanOneItem
HasAtLeastOneItem
HasItemsCount
HasItemsCountAtLeast
HasMoreItemsThan
IsNullOrEmpty
IsNotNullOrEmpty

Complex conditions (from v2.0): It is possible to create more complex conditions using And and Or operators. Both operators are available for every simple conditions.

Examples:

  int value = 2;
  if (value.IsPositive().And.IsGreaterThan(0))
  {
    ...
  }

  string value = "Hi!";
  if (value.IsNotNullOrEmpty().Or.IsGuid())
  {
    ...
  }

NuGet: https://www.nuget.org/packages/Conditions.NET

Guards.NET

This library provides guard clauses that could be used to guard against not expected values. It provides conditions for objects, strings, numerics, datatime and enumerables.

Available checks:

Object:

Check.If(@object).IsNotNull()
Check.If(@object).IsNull()

String:

Check.If(@string).IsNotNullOrEmpty()
Check.If(@string).IsGuid()
Check.If(@string).IsEmailAddress()
Check.If(@string).HasLength(5)
Check.If(@string).HasLengthAtLeast(5)

Numeric:

Check.If(number).IsGreaterThan(5)
Check.If(number).IsGreaterOrEqual(5)
Check.If(number).IsLowerThan(5)
Check.If(number).IsLowerOrEqual(5)
Check.If(number).IsBetween(5, 10)

DateTime:

Check.If(date).IsGreaterThan(referenceDate)

Enumerables:

Check.If(list).IsEmpty()
Check.If(list).IsNotEmpty()
Check.If(list).IsNullOrEmpty()
Check.If(list).IsNotNullOrEmpty()
Check.If(list).HasExactlyOneItem()
Check.If(list).HasMoreThanOneItem()
Check.If(list).HasAtLeastOneItem()
Check.If(list).HasItemsCount(3)
Check.If(list).HasItemsCountAtLeast(5)
Check.If(list).HasMoreItemsThan(9)

It is possible to configure which exception should be thrown. It can be done by using AndThrowThisWhenFails static method on Check object. You can configure every check from Guards.NET to throw any exception you want. Examples of use:

Check.AndThrowThisWhenFails<InvalidOperationException>().If(date).IsGreaterThan(referenceDate)
Check.AndThrowThisWhenFails(()=> new MyCustomException("wrong values", min, max).If(number).IsBetween(5, 10)

NuGet: https://www.nuget.org/packages/Guards.NET

Contributions

If you would like to contribute I am really happy to include your code to both libraries. Just create pull request with your code. Please stick to standards of code used in solution.