vb.net qr code generator source code Part IV in VS .NET

Generator QR Code in VS .NET Part IV

Part IV
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Core Facilities
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DefaultBinder object . Type offers a public, static, read-only property, DefaultBinder, that
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QR Code ISO/IEC18004 Creation In .NET Framework
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you can query to obtain a reference to a DefaultBinder object should you want one . When a binder object has its methods called, the methods will be passed parameters to help the binder make a decision . Certainly, the binder is passed the name of the member that is being looked for . In addition, the binder s methods are passed the specified BindingFlags as well as the types of all of the parameters that need to be passed to the member being invoked . Earlier in this chapter, Table 23-2 described the following BindingFlags: Default, IgnoreCase, DeclaredOnly, Instance, Static, Public, NonPublic, and FlattenHierarchy . The presence of these flags tells the binder which members to include in the search . In addition to these flags, the binder examines the number of arguments passed via InvokeMember s args parameter . The number of arguments limits the set of possible matches even further . The binder then examines the types of the arguments to limit the set even more . However, when it comes to the argument s types, the binder applies some automatic type conversions to make things a bit more flexible . For example, a type can define a method that takes a single Int64 parameter . If you call InvokeMember, and in the args parameter, pass a reference to an array containing an Int32 value, the DefaultBinder considers this a match . When invoking the method, the Int32 value will be converted to an Int64 value . The DefaultBinder supports the conversions listed in Table 23-4 .
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TABLE 23-4
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Conversions That DefaultBinder Supports
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Target Type
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Its base type The interfaces it implements
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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 Single, Double Single, Double Double
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Source Type
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QR Code Creator In None
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Any type Any type
Char Byte SByte UInt16 Int16 UInt32 Int32 UInt64 Int64 Single
A value type instance
A boxed version of the value type instance
23 Assembly Loading and Reflection
There are two more BindingFlags that you can use to fine-tune the DefaultBinder s behavior . These are described in Table 23-5 .
TABLE 23-5 BindingFlags
used with DefaultBinder
Value
0x010000
Symbol
ExactBinding
Description
The binder will look for a member whose formal parameters exactly match the types of the supplied arguments . The binder will consider any member whose count of parameters matches the number of arguments passed . This flag is useful when there are members whose parameters have default values and for methods that take a variable number of arguments . Only Type s InvokeMember method honors this flag .
OptionalParamBinding
0x040000
InvokeMember s last parameter, culture, could also be used for binding . However, the DefaultBinder type completely ignores this parameter . If you define your own binder, you
could use the culture parameter to help with argument type conversions . For example, the caller could pass a String argument with a value of 1,23 . The binder could examine this string, parse it using the specified culture, and convert the argument s type to a Single (if the culture is de-DE ) or continue to consider the argument to be a String (if the culture is en-US ) . At this point, I ve gone through all InvokeMember s parameters related to binding . The one parameter I haven t discussed yet is target . This parameter is a reference to the object whose member you want to call . If you want to call a type s static member, you should pass null for this parameter . The InvokeMember method is a very powerful method . It allows you to call a method (as I ve been discussing), construct an instance of a type (basically by calling a constructor method), get or set a field, or get or set a property . You tell InvokeMember which of these actions you want to perform by specifying one of the BindingFlags listed in Table 23-6 . For the most part, the flags in Table 23-6 are mutually exclusive you must pick one and only one when calling InvokeMember . However, you can specify both GetField and GetProperty, in which case InvokeMember searches for a matching field first and then for a matching property if it doesn t find a matching field . Likewise, SetField and SetProperty can both be specified and are matched the same way . The binder uses these flags to narrow the set of possible matches . If you specify the BindingFlags.CreateInstance flag, the binder knows that it can select only a constructor method .
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