What is activator CreateInstance?
The Activator. CreateInstance method creates an instance of a type defined in an assembly by invoking the constructor that best matches the specified arguments. If no arguments are specified then the constructor that takes no parameters, that is, the default constructor, is invoked.
What is CreateInstance?
CreateInstance(ActivationContext) Creates an instance of the type designated by the specified ActivationContext object. CreateInstance(AppDomain, String, String) Creates an instance of the type whose name is specified in the specified remote domain, using the named assembly and parameterless constructor.
What is System reflection BindingFlags?
Specifies flags that control binding and the way in which the search for members and types is conducted by reflection. This enumeration has a FlagsAttribute attribute that allows a bitwise combination of its member values.
Is activator CreateInstance slow?
Activator. CreateInstance is 2× faster, i.e. roughly 5× slower than calling new Headers() The compiled expression and dynamic method approaches are roughly the same as calling new Headers() .
Can activator CreateInstance return null?
The CreateInstance method call return “ObjectHandle” type which is not convertable to “I”, Activator. CreateInstance(null, myClassName) as I will always return null.
What is Activator C#?
The Activator. CreateInstance method creates an instance of a specified type using the constructor that best matches the specified parameters.
What is C# reflection?
Reflection in C# is used to retrieve metadata on types at runtime. In using reflection, you get objects of the type “Type” that can be used to represent assemblies, types, or modules. You can use reflection to create an instance of a type dynamically and even invoke methods of the type.
Is reflection C# slow?
Reflection will always be slower than direct calls, because you have to perform several steps to find and verify that what you’re calling exists. It was always bad…. Of course sometimes you have no choice, its up to the programmer to know when those times are, and avoid it otherwise.
How does reflection work C#?
Reflection provides objects (of type Type) that describe assemblies, modules, and types. You can use reflection to dynamically create an instance of a type, bind the type to an existing object, or get the type from an existing object and invoke its methods or access its fields and properties.
Is VB NET and C# same?
Though C# and VB.NET are syntactically very different, that is where the differences mostly end. Microsoft developed both of these languages to be part of the same . They are both developed, managed, and supported by the same language development team at Microsoft.
When to use the invokemember flag with bindingflags?
This flag should only be used with InvokeMember (String, BindingFlags, Binder, Object, Object [], ParameterModifier [], CultureInfo, String []). Parameters with default values are used only in calls where trailing arguments are omitted.
What does the binding flag in COM properties do?
Specifies that the value of the specified property should be set. For COM properties, specifying this binding flag is equivalent to specifying PutDispProperty and PutRefDispProperty. This flag is passed to an InvokeMember method to invoke a property setter.
How does the CreateInstance method in Microsoft Office work?
This method calls the parameterless constructor for typeName. See AssemblyName for the format of assemblyName. An attempt to call CreateInstance on a target application domain that is not the current application domain will result in a successful load of the assembly in the target application domain.
What is the definition of bindingflags in reflection?
BindingFlags BindingFlags BindingFlags BindingFlags Enum. Definition. Specifies flags that control binding and the way in which the search for members and types is conducted by reflection. This enumeration has a FlagsAttribute attribute that allows a bitwise combination of its member values.