vb.net 属性反射 - 如何获得价值？
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Property reflection - How to get value?
提问by don_mega
I have a need to get properties and their values dynamically. My code below is failing. Can someone give me a hand? I have tried numerous examples but nothing so far.
我需要动态获取属性及其值。我下面的代码失败了。有人可以帮我吗？我已经尝试了很多例子，但到目前为止还没有。
Dim seriesName As String = s.SeriesName
If model.Settings.ShowNativeLanguage Then
Dim propInfo As System.Reflection.PropertyInfo = s.GetType().GetProperty(model.Country)
seriesName = CStr(propInfo.GetValue(s, Nothing))
End If
This code produces the error "Object does not match target type."
此代码产生错误“对象与目标类型不匹配”。
采纳答案by peter
The question was already answered here for C# Object does not match target type using C# Reflection
这里已经回答了这个问题，因为 C# Object does not match target type using C# Reflection
The solution is to change this line of your code:
解决方案是更改这行代码：
seriesName = propInfo.GetValue(propInfo, Nothing).ToString()
to this:
对此：
seriesName = propInfo.GetValue(s, Nothing).ToString()
You need to pass the object of which you want to get the value. (More information in MSDN)
您需要传递要获取其值的对象。（更多信息在MSDN 中）
Update:
更新：
You should always check reflection results for Nothingvalues. So first store the output of propInfo.GetValue(s, Nothing)in a temporary variable and later on only call the ToString()-function if the object is not Nothing
您应该始终检查Nothing值的反射结果。所以首先将 的输出存储propInfo.GetValue(s, Nothing)在一个临时变量中，然后ToString()如果对象不是，则仅调用-functionNothing
回答by x0n
Surely that should be:
当然应该是：
... propInfo.GetValue(s) ...
Normally you must pass the object representing the thisinstance as the first parameter. You are getting that error because it's expecting the instance s, not a PropertyInfoinstance.
通常，您必须将表示this实例的对象作为第一个参数传递。您收到该错误是因为它期待的是 instance s，而不是PropertyInfoinstance 。
