本文整理汇总了VB.NET中System.Dynamic.DynamicObject.TryInvokeMember方法的典型用法代码示例。如果您正苦于以下问题:VB.NET DynamicObject.TryInvokeMember方法的具体用法?VB.NET DynamicObject.TryInvokeMember怎么用?VB.NET DynamicObject.TryInvokeMember使用的例子?那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类System.Dynamic.DynamicObject 的用法示例。
在下文中一共展示了DynamicObject.TryInvokeMember方法的1个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于我们的系统推荐出更棒的VB.NET代码示例。
示例1: DynamicDictionary
' Add Imports System.Reflection
' to the beginning of the file.
' The class derived from DynamicObject.
Public Class DynamicDictionary
Inherits DynamicObject
' The inner dictionary.
Dim dictionary As New Dictionary(Of String, Object)
' Getting a property value.
Public Overrides Function TryGetMember(
ByVal binder As System.Dynamic.GetMemberBinder,
ByRef result As Object) As Boolean
Return dictionary.TryGetValue(binder.Name, result)
End Function
' Setting a property value.
Public Overrides Function TrySetMember(
ByVal binder As System.Dynamic.SetMemberBinder,
ByVal value As Object) As Boolean
dictionary(binder.Name) = value
Return True
End Function
' Calling a method.
Public Overrides Function TryInvokeMember(
ByVal binder As System.Dynamic.InvokeMemberBinder,
ByVal args() As Object, ByRef result As Object) As Boolean
Dim dictType As Type = GetType(Dictionary(Of String, Object))
Try
result = dictType.InvokeMember(
binder.Name,
BindingFlags.InvokeMethod,
Nothing, dictionary, args)
Return True
Catch ex As Exception
result = Nothing
Return False
End Try
End Function
' This method prints out dictionary elements.
Public Sub Print()
For Each pair In dictionary
Console.WriteLine(pair.Key & " " & pair.Value)
Next
If (dictionary.Count = 0) Then
Console.WriteLine("No elements in the dictionary.")
End If
End Sub
End Class
Sub Test()
' Creating a dynamic dictionary.
Dim person As Object = New DynamicDictionary()
' Adding new dynamic properties.
' The TrySetMember method is called.
person.FirstName = "Ellen"
person.LastName = "Adams"
' Calling a method defined in the DynmaicDictionary class.
' The Print method is called.
person.Print()
Console.WriteLine(
"Removing all the elements from the dictionary.")
' Calling a method that is not defined in the DynamicDictionary class.
' The TryInvokeMember method is called.
person.Clear()
' Calling the Print method again.
person.Print()
' The following statement throws an exception at run time.
' There is no Sample method
' in the dictionary or in the DynamicDictionary class.
' person.Sample()
End Sub
开发者ID:VB.NET开发者,项目名称:System.Dynamic,代码行数:85,代码来源:DynamicObject.TryInvokeMember 输出:
FirstName Ellen
LastName Adams
Removing all the elements from the dictionary.
No elements in the dictionary.
注:本文中的System.Dynamic.DynamicObject.TryInvokeMember方法示例由纯净天空整理自Github/MSDocs等源码及文档管理平台,相关代码片段筛选自各路编程大神贡献的开源项目,源码版权归原作者所有,传播和使用请参考对应项目的License;未经允许,请勿转载。 |
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