Extension Method Examples

EnumerableExtensions

The EnumerableExtensions class provides extension methods for working with IEnumerable<T> sequences. Most are inverted counterparts to existing extension methods that allow shorthand to be used for the filter function being passed in (for example, stringValues.Where(string.IsNullOrEmpty) instead of stringValues.Where(x => string.IsNullOrEmpty(x))).

string[] values = { "", null, "testing" };

bool areAnyNotNullOrEmpty = values.AnyNot(x => string.IsNullOrEmpty(x));
bool areAllNotNullOrEmpty = values.None(x => string.IsNullOrEmpty(x));
var nonNullOrEmptyValues = values.WhereNot(x => string.IsNullOrEmpty(x));

var valuesStartingAtNull = values.SkipUntil(x => x == null);
var valuesUntilFirstNull = values.TakeUntil(x => x == null);

StringExtensions

The StringExtensions class provides extension methods for working with string objects.

// A Contains method that accepts a StringComparison parameter
bool containsCodeTiger = "An example for CodeTiger".Contains("codetiger", StringComparison.OrdinalIgnoreCase);

// A SplitAt method that splits a string at a specific location
string[] stringParts = "Testing".SplitAt(4);

TypeExtensions and TypeInfoExtensions

The TypeExtensions and TypeInfoExtensions classes provide extension methods for working with Type and TypeInfo objects.

// An IsCompilerGenerated method determines whether a type was generated by the compiler
bool isCompilerGenerated = typeof(string).IsCompilerGenerated();
isCompilerGenerated = typeof(string).GetTypeInfo().IsCompilerGenerated();

// An IsStatic method determines whether a type is static
bool isStatic = typeof(string).IsStatic();
isStatic = typeof(string).GetTypeInfo().IsStatic();