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Class TypeHelper

A utility class for type checking, this provides internal caching so that calls to these methods will be faster than doing a manual type check in c#

Inheritance

System.Object

Namespace: Umbraco.Cms.Core.Composing

Assembly: Umbraco.Core.dll

Syntax

public static class TypeHelper

Methods

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CachedDiscoverableFields(Type)

Gets (and caches) System.Reflection.FieldInfo discoverable in the current for a given type.

Declaration

public static FieldInfo[] CachedDiscoverableFields(Type type)

Parameters

Type	Name	Description
Type	type	The source.

Returns

Type	Description
System.Reflection.FieldInfo[]

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CachedDiscoverableProperties(Type, Boolean, Boolean, Boolean)

Gets (and caches) System.Reflection.PropertyInfo discoverable in the current for a given type.

Declaration

public static PropertyInfo[] CachedDiscoverableProperties(Type type, bool mustRead = true, bool mustWrite = true, bool includeIndexed = false)

Parameters

Type	Name	Description
Type	type	The source.
System.Boolean	mustRead	true if the properties discovered are readable
System.Boolean	mustWrite	true if the properties discovered are writable
System.Boolean	includeIndexed	true if the properties discovered are indexable

Returns

Type	Description
System.Reflection.PropertyInfo[]

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CreateGenericEnumerableFromObject(Object)

Based on a type we'll check if it is IEnumerable{T} (or similar) and if so we'll return a List{T}, this will also deal with array types and return List{T} for those too. If it cannot be done, null is returned.

Declaration

public static IList CreateGenericEnumerableFromObject(object obj)

Parameters

Type	Name	Description
System.Object	obj

Returns

Type	Description
System.Collections.IList

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GetLowestBaseType(Type[])

Finds a lowest base class amongst a collection of types

Declaration

public static Attempt<Type?> GetLowestBaseType(params Type[] types)

Parameters

Type	Name	Description
Type[]	types

Returns

Type	Description
Attempt<System.Nullable<Type>>

Remarks

The term 'lowest' refers to the most base class of the type collection. If a base type is not found amongst the type collection then an invalid attempt is returned.

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GetProperty(Type, String, Boolean, Boolean, Boolean, Boolean)

Returns (and caches) a PropertyInfo from a type

Declaration

public static PropertyInfo GetProperty(Type type, string name, bool mustRead = true, bool mustWrite = true, bool includeIndexed = false, bool caseSensitive = true)

Parameters

Type	Name	Description
Type	type
System.String	name
System.Boolean	mustRead
System.Boolean	mustWrite
System.Boolean	includeIndexed
System.Boolean	caseSensitive

Returns

Type	Description
System.Reflection.PropertyInfo

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GetReferencingAssemblies(Assembly, IEnumerable<Assembly>)

Find all assembly references that are referencing the assignTypeFrom Type's assembly found in the assemblyList

Declaration

public static IReadOnlyList<Assembly> GetReferencingAssemblies(Assembly assembly, IEnumerable<Assembly> assemblies)

Parameters

Type	Name	Description
System.Reflection.Assembly	assembly	The referenced assembly.
System.Collections.IEnumerable<System.Reflection.Assembly>	assemblies	A list of assemblies.

Returns

Type	Description
IReadOnlyList<System.Reflection.Assembly>

Remarks

If the assembly of the assignTypeFrom Type is in the App_Code assembly, then we return nothing since things cannot reference that assembly, same with the global.asax assembly.

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HasReference(Assembly, String)

Determines if an assembly references another assembly.

Declaration

public static bool HasReference(Assembly assembly, string name)

Parameters

Type	Name	Description
System.Reflection.Assembly	assembly
System.String	name

Returns

Type	Description
System.Boolean

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IsImplicitValueType(Type)

A method to determine whether implementation is an implied value type ( , or a string).

Declaration

public static bool IsImplicitValueType(Type implementation)

Parameters

Type	Name	Description
Type	implementation	The implementation.

Returns

Type	Description
System.Boolean

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IsNonStaticClass(Type)

Returns true if the type is a class and is not static

Declaration

public static bool IsNonStaticClass(Type t)

Parameters

Type	Name	Description
Type	t

Returns

Type	Description
System.Boolean

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IsOverride(MethodInfo)

Checks if the method is actually overriding a base method

Declaration

public static bool IsOverride(MethodInfo m)

Parameters

Type	Name	Description
System.Reflection.MethodInfo	m

Returns

Type	Description
System.Boolean

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IsStaticClass(Type)

Returns true if the type is a static class

Declaration

public static bool IsStaticClass(Type type)

Parameters

Type	Name	Description
Type	type

Returns

Type	Description
System.Boolean

Remarks

In IL a static class is abstract and sealed see: http://stackoverflow.com/questions/1175888/determine-if-a-type-is-static

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IsTypeAssignableFrom(Type, Nullable<Type>)

Determines whether the type implementation is assignable from the specified implementation, and caches the result across the application using a System.Collections.Concurrent.ConcurrentDictionary<TKey, TValue>.

Declaration

public static bool IsTypeAssignableFrom(Type contract, Type? implementation)

Parameters

Type	Name	Description
Type	contract	The type of the contract.
System.Nullable<Type>	implementation	The implementation.

Returns

Type	Description
System.Boolean	`true` if [is type assignable from] [the specified contract]; otherwise, `false`.

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IsTypeAssignableFrom<TContract>(Object)

Determines whether the object instance implementation is assignable from the specified implementation TContract, and caches the result across the application using a System.Collections.Concurrent.ConcurrentDictionary<TKey, TValue>.

Declaration

public static bool IsTypeAssignableFrom<TContract>(object implementation)

Parameters

Type	Name	Description
System.Object	implementation	The implementation.

Returns

Type	Description
System.Boolean

Type Parameters

Name	Description
TContract	The type of the contract.

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IsTypeAssignableFrom<TContract>(Type)

Determines whether the type implementation is assignable from the specified implementation TContract, and caches the result across the application using a System.Collections.Concurrent.ConcurrentDictionary<TKey, TValue>.

Declaration

public static bool IsTypeAssignableFrom<TContract>(Type implementation)

Parameters

Type	Name	Description
Type	implementation	The implementation.

Returns

Type	Description
System.Boolean

Type Parameters

Name	Description
TContract	The type of the contract.

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IsValueType(Type)

A method to determine whether implementation represents a value type.

Declaration

public static bool IsValueType(Type implementation)

Parameters

Type	Name	Description
Type	implementation	The implementation.

Returns

Type	Description
System.Boolean

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MatchType(Type, Type)

Declaration

public static bool MatchType(Type implementation, Type contract)

Parameters

Type	Name	Description
Type	implementation
Type	contract

Returns

Type	Description
System.Boolean

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MatchType(Type, Type, IDictionary<String, Type>, Boolean)

Declaration

public static bool MatchType(Type implementation, Type contract, IDictionary<string, Type> bindings, bool variance = true)

Parameters

Type	Name	Description
Type	implementation
Type	contract
System.Collections.IDictionary<System.String, Type>	bindings
System.Boolean	variance

Returns

Type	Description
System.Boolean