Get property value from C dynamic object by string reflection

Question

Imagine that I have a dynamic variable   dynamic d    something    Now  I create properties for d which I have on the other hand from a string array   string   strarray      property1   property2            I don t know the property names in advance   How in code  once d is created and strarray is pulled from DB  can I get the values   I want to get d property1   d property2   I see that the object has a  dictionary internal dictionary that contains the keys and the values  how do I retrieve them

User · Answer

string json   w JSON   var serializer   new JavaScriptSerializer    serializer RegisterConverters new     new DynamicJsonConverter        DynamicJsonConverter DynamicJsonObject obj           DynamicJsonConverter DynamicJsonObject serializer Deserialize json  typeof object      Now obj  Dictionary contains a  dictionary  Perfect   This code must be used in conjunction with  Deserialize JSON into C  dynamic object    make the  dictionary variable from  private readonly  to public in the code there

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Thought this might help someone in the future   If you know the property name already  you can do something like the following    HttpPost   Route  myRoute    public object SomeApiControllerMethod  FromBody  dynamic args      var stringValue   args MyPropertyName ToString         do something with the string value   If this is an int  we can int Parse it  or if it s a string  we can just use it directly       some more code here        return stringValue

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Did you see ExpandoObject class   Directly from MSDN description   Represents an object whose members can be dynamically added and removed at run time    With it you can write code like this   dynamic employee   new ExpandoObject    employee Name    John Smith     IDictionary lt String  Object gt  employee  Remove  Name

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This will give you all property names and values defined in your dynamic variable   dynamic d        your code    object o   d  string   propertyNames   o GetType   GetProperties   Select p   gt  p Name  ToArray    foreach  var prop in propertyNames        object propValue   o GetType   GetProperty prop  GetValue o  null

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I don t know if there s a more elegant way with dynamically created objects  but using plain old reflection should work   var nameOfProperty    property1   var propertyInfo   myObject GetType   GetProperty nameOfProperty   var value   propertyInfo GetValue myObject  null     GetProperty will return null if the type of myObject does not contain a public property with this name     EDIT  If the object is not a  regular  object but something implementing IDynamicMetaObjectProvider  this approach will not work  Please have a look at this question instead    How do I reflect over the members of dynamic object

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IF d was created by Newtonsoft you can use this to read property names and values       foreach  JProperty property in d                DoSomething property Name  property Value

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you can use  dynamicObject PropertyName Value  to get value of dynamic property directly   Example     d property11 Value

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Use the following code to get Name and Value of a dynamic object s property   dynamic d   new   Property1   Value1   Property2   Value2     var properties   d GetType   GetProperties    foreach  var property in properties        var PropertyName property Name     You get  Property1  as a result    var PropetyValue d GetType   GetProperty property Name  GetValue d  null      You get  Value1  as a result     you can use the PropertyName and Value here

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Hope this would help you   public static object GetProperty object o  string member        if o    null  throw new ArgumentNullException  o        if member    null  throw new ArgumentNullException  member        Type scope   o GetType        IDynamicMetaObjectProvider provider   o as IDynamicMetaObjectProvider      if provider    null                ParameterExpression param   Expression Parameter typeof object            DynamicMetaObject mobj   provider GetMetaObject param           GetMemberBinder binder    GetMemberBinder Microsoft CSharp RuntimeBinder Binder GetMember 0  member  scope  new CSharpArgumentInfo   CSharpArgumentInfo Create 0  null             DynamicMetaObject ret   mobj BindGetMember binder           BlockExpression final   Expression Block              Expression Label CallSiteBinder UpdateLabel               ret Expression                    LambdaExpression lambda   Expression Lambda final  param           Delegate del   lambda Compile            return del DynamicInvoke o        else          return o GetType   GetProperty member  BindingFlags Public   BindingFlags Instance  GetValue o  null

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you can try like this   d  property1   d  property2   I have tested it and working with  netcore 2 1

[c#] Get property value from C# dynamic object by string (reflection?)

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