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.Namespace: System.Reflection
Assembly: mscorlib (in mscorlib.dll)
|Specifies no binding flag.|
|Specifies that the case of the member name should not be considered when binding.|
|Specifies that only members declared at the level of the supplied type's hierarchy should be considered. Inherited members are not considered.|
|Specifies that instance members are to be included in the search.|
|Specifies that static members are to be included in the search.|
|Specifies that public members are to be included in the search.|
|Specifies that non-public members are to be included in the search.|
|Specifies that public and protected static members up the hierarchy should be returned. Private static members in inherited classes are not returned. Static members include fields, methods, events, and properties. Nested types are not returned.|
|Specifies that a method is to be invoked. This must not be a constructor or a type initializer.|
|Specifies that Reflection should create an instance of the specified type. Calls the constructor that matches the given arguments. The supplied member name is ignored. If the type of lookup is not specified, (Instance | Public) will apply. It is not possible to call a type initializer.|
|Specifies that the value of the specified field should be returned.|
|Specifies that the value of the specified field should be set.|
|Specifies that the value of the specified property should be returned.|
|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.|
|Specifies that the PROPPUT member on a COM object should be invoked. PROPPUT specifies a property-setting function that uses a value. Use PutDispProperty if a property has both PROPPUT and PROPPUTREF and you need to distinguish which one is called.|
|Specifies that the PROPPUTREF member on a COM object should be invoked. PROPPUTREF specifies a property-setting function that uses a reference instead of a value. Use PutRefDispProperty if a property has both PROPPUT and PROPPUTREF and you need to distinguish which one is called.|
|Specifies that types of the supplied arguments must exactly match the types of the corresponding formal parameters. Reflection throws an exception if the caller supplies a non-null Binder object, since that implies that the caller is supplying BindToXXX implementations that will pick the appropriate method.|
Reflection models the accessibility rules of the common type system. For example, if the caller is in the same assembly, the caller does not need special permissions for internal members. Otherwise, the caller needs ReflectionPermission. This is consistent with lookup of members that are protected, private, and so on.
The general principle is that ChangeType should perform only widening coercions, which never lose data. An example of a widening coercion is coercing a value that is a 32-bit signed integer to a value that is a 64-bit signed integer. This is distinguished from a narrowing coercion, which may lose data. An example of a narrowing coercion is coercing a 64-bit signed integer to a 32-bit signed integer.
The default binder ignores this flag, while custom binders can implement the semantics of this flag.
|Returns the set of members whose parameter count matches the number of supplied arguments. This binding flag is used for methods with parameters that have default values and methods with variable arguments (varargs). This flag should only be used with Type.InvokeMember.|
Parameters with default values are used only in calls where trailing arguments are omitted. They must be the last arguments.
|Used in COM interop to specify that the return value of the member can be ignored.|
These BindingFlags control binding for a great many classes in the System, System.Reflection, and System.Runtime namespaces that invoke, create, get, set, and find members and types.
InvokeMember and GetMethod are especially important.
The binding flags can be categorized by how they identify a type member, as listed in the following table.
Identified by Accessibility
Identified by Binding Argument
Identified by Operation
You must specify Instance or Static along with Public or NonPublic or no members will be returned.
The following table lists the coercions performed by the default Binder.ChangeType. This table applies especially to the ExactBinding binding flag.
Its base type.
The interface it implements.
UInt16, UInt32, Int32, UInt64, Int64, Single, Double
Char, UInt16, Int16, UInt32, Int32, UInt64, Int64, Single, Double
Int16, Int32, Int64, Single, Double
UInt32, Int32, UInt64, Int64, Single, Double
Int32, Int64, Single, Double
UInt64, Int64, Single, Double
Int64, Single, Double
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.