Common Extension Methods

Extension Methods for many different classes within .NET.

Collections

Command	Description
myCollection.FirstOrNull<T>()	Returns the first element of a sequence, or null if the sequence contains no elements.
myCollection.FirstOrNull<T>(Func<T, bool> predicate)	Returns the first element of the sequence that satisfies a condition or null if no such element is found.
myCollection.AddIfNotPresent<T>(T item)	Adds an item to the "ICollection", if it not already present in the collection.
myConcurrentBag.AddIfNotPresent<T>(T item)	Adds an item to the "ConcurrentBag", if it not already present in the collection.

Enums

Command	Description
myEnum.GetDescription()	Gets the description for the enum member, decorated with a "DescriptionAttribute".
myEnum.Count()	Gets the number of values within this enumeration.

Strings

Command	Description
myString.IfNullOrWhitespace(string defaultString)	Returns a default string, if a specified string is "null", empty, or consists only of white-space characters.
myString.IfNullOrEmpty(string defaultString)	Returns a default string, if a specified string is "null", or empty.
myString.StartsWithAny(IEnumerable<string> values)	Determines whether the beginning of this string instance matches any of the specified strings.
myString.StartsWithAny(params string[] values)	Determines whether the beginning of this string instance matches any of the specified strings.
myString.ContainsAny(IEnumerable<string> values)	Determines whether the string instance contains any of the specified strings.
myString.ContainsAny(params string[] values)	Determines whether the string instance contains any of the specified strings.
myString.ToOrdinal(int value)	Converts a number to its ordinal string representation.

Objects

Command	Description
myObject.DynamicProperties()	Gets a dynamic collection of properties associated with an object instance, with a lifetime scoped to the lifetime of the object.
myObject.To<T>()	Dynamically casts the object instance to a specified type.
myObject.With<T>(Action<T> work)	A close approximation to Visual Basic's "With" keyword, that allows batch setting of Properties, without needing to initialise the object.

Reflection

Command	Description
myAssembly.InstantiateAllTypes<T>(params object[] constructorArgs)	Scans an assembly for all instantiable classes of a specified type, and forms an array of instances.
myAssembly.GetTypesWithAttribute<T>()	Gets the derived types of a specified Attribute, within the assembly.
myType.GetDerivedTypesFromAssembly(Assembly assembly)	Gets the derived types of a specified Attribute, within a given assembly.
myMember.HasCustomAttribute<T>()	Determines whether the specified member is decorated with the given custom attribute.
myProperty.TryGetDefaultValue(out object defaultValue)	Tries the get default value of a property, via its "PropertyInfo".
myProperty.TryGetDefaultValue<T>(out T defaultValue)	Tries the get default value of a property, via its "PropertyInfo".