1
反射提供语言编译器(如 Microsoft Visual Basic 2005 和 JScript)用于实现隐式后期绑定的基础结构。绑定是查找与唯一指定的类型相对应的声明(即实现)的过程。如果此过程是在运行时而不是在编译时发生,则称其为“后期绑定”。利用 Visual Basic 2005,可以在代码中使用隐式后期绑定;Visual Basic 编译器会调用一个帮助器方法,该方法使用反射来获取对象类型。传递给帮助器方法的参数有助于在运行时调用正确的方法。这些参数包括:对其调用方法的实例(对象),被调用方法的名称(字符串),以及传递给被调用方法的参数(对象数组)。
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在下面的示例中,Visual Basic 编译器使用反射隐式地对其类型在编译时未知的对象调用方法。HelloWorld 类具有一个 PrintHello 方法,它输出与传递给 PrintHello 方法的某些文本串联的“Hello World”。在此示例中调用的 PrintHello 方法实际上是 Type..::.InvokeMember;Visual Basic 代码允许按照对象 (helloObj) 的类型在编译时已知(早期绑定)而不是在运行时已知(后期绑定)的方式来调用 PrintHello 方法。
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复制代码
6
Imports System
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Module Hello
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Sub Main()
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' Sets up the variable.
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Dim helloObj As Object
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' Creates the object.
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helloObj = new HelloWorld()
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' Invokes the print method as if it was early bound
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' even though it is really late bound.
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helloObj.PrintHello("Visual Basic Late Bound")
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End Sub
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End Module
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自定义绑定
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除了由编译器隐式地用来进行后期绑定之外,反射还可以在代码中显式地用来完成后期绑定。
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公共语言运行库支持多种编程语言,但这些语言的绑定规则各不相同。在早期绑定的情况下,代码生成器可以完全控制此绑定。但是,当通过反射进行后期绑定时,必须用自定义绑定来控制绑定。Binder 类提供了对成员选择和调用的自定义控制。
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利用自定义绑定,您可以在运行时加载程序集,获取有关该程序集中类型的信息,然后对该类型调用方法或访问该类型的字段或属性。如果您在编译时(例如当对象类型依赖于用户输入时)不知道对象的类型,就可以使用这种方法。
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下面的示例说明不提供参数类型转换的简单的自定义联编程序。Simple_Type.dll 的代码位于示例主体之前。确保生成 Simple_Type.dll,然后在生成时在项目中包括对它的引用。
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Visual Basic 复制代码
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' Code for building Simple_Type.dll.
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Imports System
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Namespace Simple_Type
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Public Class MySimpleClass
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Public Overloads Sub MyMethod(ByVal str As String,
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ByVal i As Integer)
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Console.WriteLine("MyMethod parameters: {0}, {1}", str, i)
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End Sub 'MyMethod
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Public Overloads Sub MyMethod(ByVal str As String,
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ByVal i As Integer, ByVal j As Integer)
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Console.WriteLine("MyMethod parameters: {0}, {1}, {2}", str,
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i, j)
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End Sub 'MyMethod
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End Class 'MySimpleClass
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End Namespace 'Simple_Type
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Imports System
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Imports System.Reflection
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Imports System.Globalization
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Imports Simple_Type.Simple_Type
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Namespace Custom_Binder
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Class MyMainClass
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Shared Sub Main()
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' Get the type of MySimpleClass.
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Dim myType As Type = GetType(MySimpleClass)
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' Get an instance of MySimpleClass.
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Dim myInstance As New MySimpleClass()
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Dim myCustomBinder As New MyCustomBinder()
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' Get the method information for the overload being sought.
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Dim myMethod As MethodInfo = myType.GetMethod("MyMethod",
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BindingFlags.Public Or BindingFlags.Instance,
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myCustomBinder, New Type() {GetType(String),
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GetType(Integer)}, Nothing)
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Console.WriteLine(myMethod.ToString())
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' Invoke the overload.
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myType.InvokeMember("MyMethod", BindingFlags.InvokeMethod,
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myCustomBinder, myInstance,
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New [Object]() {"Testing
", CInt(32)})
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End Sub 'Main
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End Class 'MyMainClass
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'****************************************************
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' A simple custom binder that provides no
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' argument type conversion.
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'****************************************************
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Class MyCustomBinder
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Inherits Binder
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Public Overrides Function BindToMethod(ByVal bindingAttr As
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BindingFlags, ByVal match() As MethodBase, ByRef args() As
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Object, ByVal modifiers() As ParameterModifier, ByVal
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culture As CultureInfo, ByVal names() As String, ByRef
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state As Object) As MethodBase
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If match Is Nothing Then
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Throw New ArgumentNullException("match")
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End If
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' Arguments are not being reordered.
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state = Nothing
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' Find a parameter match and return the first method with
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' parameters that match the request.
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Dim mb As MethodBase
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For Each mb In match
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Dim parameters As ParameterInfo() = mb.GetParameters()
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If ParametersMatch(parameters, args) Then
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Return mb
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End If
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Next mb
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Return Nothing
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End Function 'BindToMethod
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Public Overrides Function BindToField(ByVal bindingAttr As
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BindingFlags, ByVal match() As FieldInfo, ByVal value As
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Object, ByVal culture As CultureInfo) As FieldInfo
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If match Is Nothing Then
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Throw New ArgumentNullException("match")
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End If
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Dim fi As FieldInfo
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For Each fi In match
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If fi.GetType() Is value.GetType() Then
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Return fi
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End If
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Next fi
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Return Nothing
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End Function 'BindToField
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Public Overrides Function SelectMethod(ByVal bindingAttr As
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BindingFlags, ByVal match() As MethodBase, ByVal types() As
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Type, ByVal modifiers() As ParameterModifier) As
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MethodBase
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If match Is Nothing Then
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Throw New ArgumentNullException("match")
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End If
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' Find a parameter match and return the first method with
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' parameters that match the request.
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Dim mb As MethodBase
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For Each mb In match
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Dim parameters As ParameterInfo() = mb.GetParameters()
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If ParametersMatch(parameters, types) Then
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Return mb
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End If
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Next mb
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Return Nothing
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End Function 'SelectMethod
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Public Overrides Function SelectProperty(ByVal bindingAttr As
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BindingFlags, ByVal match() As PropertyInfo, ByVal returnType
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As Type, ByVal indexes() As Type, ByVal modifiers() As
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ParameterModifier) As PropertyInfo
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If match Is Nothing Then
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Throw New ArgumentNullException("match")
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End If
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Dim pi As PropertyInfo
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For Each pi In match
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If pi.GetType() Is returnType And
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ParametersMatch(pi.GetIndexParameters(), indexes) Then
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Return pi
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End If
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Next pi
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Return Nothing
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End Function 'SelectProperty
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Public Overrides Function ChangeType(ByVal value As Object,
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ByVal myChangeType As Type, ByVal culture As CultureInfo)
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As Object
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Try
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Dim newType As Object
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newType = Convert.ChangeType(value, myChangeType)
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Return newType
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' Throw an InvalidCastException if the conversion cannot
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' be done by the Convert.ChangeType method.
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Catch
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End Try
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End Function 'ChangeType
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Public Overrides Sub ReorderArgumentArray(ByRef args() As Object,
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ByVal state As Object)
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' No operation is needed here because BindToMethod does not
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' reorder the args array. The most common implementation
172
' of this method is shown below.
173
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' ((BinderState)state).args.CopyTo(args, 0);
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End Sub 'ReorderArgumentArray
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' Returns true only if the type of each object in a matches
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' the type of each corresponding object in b.
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Private Overloads Function ParametersMatch(ByVal a() As
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ParameterInfo, ByVal b() As Object) As Boolean
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If a.Length <> b.Length Then
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Return False
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End If
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Dim i As Integer
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For i = 0 To a.Length - 1
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If Not (a(i).ParameterType Is b(i).GetType()) Then
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Return False
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End If
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Next i
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Return True
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End Function 'ParametersMatch
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' Returns true only if the type of each object in a matches
194
' the type of each corresponding entry in b.
195
Private Overloads Function ParametersMatch(ByVal a() As
196
ParameterInfo, ByVal b() As Type) As Boolean
197
If a.Length <> b.Length Then
198
Return False
199
End If
200
Dim i As Integer
201
For i = 0 To a.Length - 1
202
If Not (a(i).ParameterType Is b(i)) Then
203
Return False
204
End If
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Next i
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Return True
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End Function 'ParametersMatch
208
End Class 'MyCustomBinder
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End Namespace 'Custom_Binder
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213
214
C# 复制代码
215
// Code for building SimpleType.dll.
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using System;
217![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
218
namespace Simple_Type
219
{
220
public class MySimpleClass
221
{
222
public void MyMethod(string str, int i)
223
{
224
Console.WriteLine("MyMethod parameters: {0}, {1}", str, i);
225
}
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public void MyMethod(string str, int i, int j)
228
{
229
Console.WriteLine("MyMethod parameters: {0}, {1}, {2}",
230
str, i, j);
231
}
232
}
233
}
234![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
235![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
236
using System;
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using System.Reflection;
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using System.Globalization;
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using Simple_Type;
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namespace Custom_Binder
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{
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class MyMainClass
243
{
244
static void Main()
245
{
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// Get the type of MySimpleClass.
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Type myType = typeof(MySimpleClass);
248![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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// Get an instance of MySimpleClass.
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MySimpleClass myInstance = new MySimpleClass();
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MyCustomBinder myCustomBinder = new MyCustomBinder();
252![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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// Get the method information for the particular overload
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// being sought.
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MethodInfo myMethod = myType.GetMethod("MyMethod",
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BindingFlags.Public | BindingFlags.Instance,
257
myCustomBinder, new Type[] {typeof(string),
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typeof(int)}, null);
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Console.WriteLine(myMethod.ToString());
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// Invoke the overload.
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myType.InvokeMember("MyMethod", BindingFlags.InvokeMethod,
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myCustomBinder, myInstance,
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new Object[] {"Testing
", (int)32});
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}
266
}
267![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
268
//****************************************************
269
// A simple custom binder that provides no
270
// argument type conversion.
271
//****************************************************
272
class MyCustomBinder : Binder
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{
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public override MethodBase BindToMethod(
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BindingFlags bindingAttr,
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MethodBase[] match,
277
ref object[] args,
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ParameterModifier[] modifiers,
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CultureInfo culture,
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string[] names,
281
out object state)
282
{
283
if(match == null)
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throw new ArgumentNullException("match");
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// Arguments are not being reordered.
286
state = null;
287
// Find a parameter match and return the first method with
288
// parameters that match the request.
289
foreach(MethodBase mb in match)
290
{
291
ParameterInfo[] parameters = mb.GetParameters();
292![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
293
if(ParametersMatch(parameters, args))
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return mb;
295
}
296
return null;
297
}
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299
public override FieldInfo BindToField(BindingFlags bindingAttr,
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FieldInfo[] match, object value, CultureInfo culture)
301
{
302
if(match == null)
303
throw new ArgumentNullException("match");
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foreach(FieldInfo fi in match)
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{
306
if(fi.GetType() == value.GetType())
307
return fi;
308
}
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return null;
310
}
311![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
312
public override MethodBase SelectMethod(
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BindingFlags bindingAttr,
314
MethodBase[] match,
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Type[] types,
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ParameterModifier[] modifiers)
317
{
318
if(match == null)
319
throw new ArgumentNullException("match");
320![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
321
// Find a parameter match and return the first method with
322
// parameters that match the request.
323
foreach(MethodBase mb in match)
324
{
325
ParameterInfo[] parameters = mb.GetParameters();
326
if(ParametersMatch(parameters, types))
327
return mb;
328
}
329![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
330
return null;
331
}
332![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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public override PropertyInfo SelectProperty(
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BindingFlags bindingAttr,
335
PropertyInfo[] match,
336
Type returnType,
337
Type[] indexes,
338
ParameterModifier[] modifiers)
339
{
340
if(match == null)
341
throw new ArgumentNullException("match");
342
foreach(PropertyInfo pi in match)
343
{
344
if(pi.GetType() == returnType &&
345
ParametersMatch(pi.GetIndexParameters(), indexes))
346
return pi;
347
}
348
return null;
349
}
350![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
351
public override object ChangeType(
352
object value,
353
Type myChangeType,
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CultureInfo culture)
355
{
356
try
357
{
358
object newType;
359
newType = Convert.ChangeType(value, myChangeType);
360
return newType;
361
}
362
// Throw an InvalidCastException if the conversion cannot
363
// be done by the Convert.ChangeType method.
364
catch(InvalidCastException)
365
{
366
return null;
367
}
368
}
369![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
370
public override void ReorderArgumentArray(ref object[] args,
371
object state)
372
{
373
// No operation is needed here because BindToMethod does not
374
// reorder the args array. The most common implementation
375
// of this method is shown below.
376
377
// ((BinderState)state).args.CopyTo(args, 0);
378
}
379![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
380
// Returns true only if the type of each object in a matches
381
// the type of each corresponding object in b.
382
private bool ParametersMatch(ParameterInfo[] a, object[] b)
383
{
384
if(a.Length != b.Length)
385
return false;
386
for(int i = 0; i < a.Length; i++)
387
{
388
if(a[i].ParameterType != b[i].GetType())
389
return false;
390
}
391
return true;
392
}
393![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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// Returns true only if the type of each object in a matches
395
// the type of each corresponding entry in b.
396
private bool ParametersMatch(ParameterInfo[] a, Type[] b)
397
{
398
if(a.Length != b.Length)
399
return false;
400
for(int i = 0; i < a.Length; i++)
401
{
402
if(a[i].ParameterType != b[i])
403
return false;
404
}
405
return true;
406
}
407
}
408
}
409
410![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
411
InvokeMember 和 CreateInstance
412
使用 Type..::.InvokeMember 可调用类型的成员。各个类(如 System.Activator 和 System.Reflection.Assembly)的 CreateInstance 方法是 InvokeMember 的特殊形式,它们可新建特定类型的实例。Binder 类用于在这些方法中进行重载决策和参数强制。
413![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
414
下面的示例显示参数强制(类型转换)和成员选择的三种可能的组合。在第 1 种情况中,不需要任何参数强制或成员选择。在第 2 种情况中,只需要成员选择。在第 3 种情况中,只需要参数强制。
415![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
416
C# 复制代码
417
public class CustomBinderDriver
418
{
419
public static void Main (string[] arguments)
420
{
421
Type t = typeof (CustomBinderDriver);
422
CustomBinder binder = new CustomBinder();
423
BindingFlags flags = BindingFlags.InvokeMethod|BindingFlags.Instance|
424
BindingFlags.Public|BindingFlags.Static;
425![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
426
// Case 1. Neither argument coercion nor member selection is needed.
427
args = new Object[] {};
428
t.InvokeMember ("PrintBob", flags, binder, null, args);
429![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
430
// Case 2. Only member selection is needed.
431
args = new Object[] {42};
432
t.InvokeMember ("PrintValue", flags, binder, null, args);
433![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
434
// Case 3. Only argument coercion is needed.
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args = new Object[] {"5.5"};
436
t.InvokeMember ("PrintNumber", flags, binder, null, args);
437
}
438![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
439
public static void PrintBob ()
440
{
441
Console.WriteLine ("PrintBob");
442
}
443![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
444
public static void PrintValue (long value)
445
{
446
Console.WriteLine ("PrintValue ({0})", value);
447
}
448
public static void PrintValue (String value)
449
{
450
Console.WriteLine ("PrintValue\"{0}\")", value);
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}
452
453
public static void PrintNumber (double value)
454
{
455
Console.WriteLine ("PrintNumber ({0})", value);
456
}
457
}
458
459![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
460
当多个成员具有相同的名称时,将需要重载决策。Binder..::.BindToMethod 和 Binder..::.BindToField 方法用于解析与单个成员的绑定。Binder.BindToMethod 还通过 get 和 set 属性访问器提供了属性解析。
461![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
462
BindToMethod 返回要调用的 MethodBase;如果无法进行这种调用,则返回 null 引用(在 Visual Basic 中为 Nothing)。虽然 MethodBase 返回值通常是 match 参数中所包含的值之一,但它并不必如此。
463![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
464
当存在 ByRef 参数时,调用方可能需要取回这些参数。因此,如果 BindToMethod 已经操作参数数组,Binder 会允许客户端将参数数组映射回它的初始形式。为了实现这一目的,必须向调用方保证参数的顺序不会改变。当按名称传递参数时,Binder 将重新排列参数数组,这就是调用方所见的参数。有关更多信息,请参见 Binder..::.ReorderArgumentArray。
465![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
466
可用成员集包括在类型和任何基类型中定义的成员。如果指定 BindingFlags.NonPublic,将返回该成员集中具有任何可访问性的成员。如果未指定 BindingFlags.NonPublic,联编程序就必须强制可访问性规则。当指定 Public 或 NonPublic 绑定标志时,还必须指定 Instance 或 Static 绑定标志,否则不会返回任何成员。
467![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
468
如果只有一个成员具有给定名称,则不必进行回调,而在该方法上进行绑定。代码示例的第 1 种情况说明了这一点:只有一个 PrintBob 方法可用,因此不需要进行回调。
469![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
470
如果可用集中有多个成员,所有这些方法都将传递给 BindToMethod,它将选择正确的方法并将其返回。在代码示例的第 2 种情况下,有两个名为 PrintValue 的方法。对 BindToMethod 的调用将选择正确的方法。
471![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
472
ChangeType 执行参数强制转换(类型转换),以便将实参转换为选定方法的形参的类型。即使类型完全匹配,也会为每个参数调用 ChangeType。
473![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
474
在代码示例的第 3 种情况下,将类型为 String 值为“5.5”的实参传递给了具有类型为 Double 的形参的方法。要使调用成功,必须将字符串值“5.5”转换为 double 值。ChangeType 会执行此转换。
475![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
476
ChangeType 仅执行无损或扩大强制,如下表所示。
477![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
478
源类型
479
目标类型
480
481
任何类型
482
它的基类型
483
484
任何类型
485
它所实现的接口
486
487
Char
488
UInt16、UInt32、Int32、UInt64、Int64、Single、Double
489
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Byte
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非引用类型
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Type 类具有 Get 方法,这些方法使用 Binder 类型的参数来解析对特定成员的引用。Type..::.GetConstructor、Type..::.GetMethod 和 Type..::.GetProperty 通过为当前类型的特定成员提供签名信息来搜索该成员。对 Binder..::.SelectMethod 和 Binder..::.SelectProperty 进行回调以选择相应方法的给定签名信息。
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