Get value of c dynamic property via string

Question

I d like to access the value of a dynamic c  property with a string   dynamic d   new   value1    some   value2    random   value3    value      How can I get the value of d value2   random   if I only have  value2  as a string  In javascript  I could do d  value2   to access the value   random    but I m not sure how to do this with c  and reflection  The closest I ve come is this   d GetType   GetProperty  value2       but I don t know how to get the actual value from that   As always  thanks for your help

User · Answer

Dynamitey is an open source  net std library  that let s you call it like the dynamic keyword  but using the a string for the property name rather than the compiler doing it for you  and it ends up being equal to  reflection speedwise  which is not nearly as fast as using the dynamic keyword  but this is due to the extra overhead of caching dynamically  where the compiler caches statically    Dynamic InvokeGet d  value2

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This is the way i ve got the value of a property value of a dinamic       public dynamic Post dynamic value                            try                       if  value    null                                var valorCampos                        foreach  Newtonsoft Json Linq JProperty item in value                                        if  item Name     valorCampo    property name                         valorCampos   item Value ToString                                                                                                  catch  Exception ex

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Similar to the accepted answer  you can also try GetField instead of GetProperty   d GetType   GetField  value2   GetValue d    Depending on how the actual Type was implemented  this may work when GetProperty   doesn t and can even be faster

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d GetType   GetProperty  value2     returns a PropertyInfo object   So then do  propertyInfo GetValue d

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The GetProperty GetValue does not work for Json data  it always generate a null exception  however  you may try this approach   Serialize your object using JsonConvert   var z   Newtonsoft Json JsonConvert DeserializeObject Convert ToString request      Then access it directly casting it back to string   var pn    string z  DynamicFieldName      It may work straight applying the Convert ToString request   DynamicFieldName    however I haven t tested

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public static object GetProperty object target  string name        var site   System Runtime CompilerServices CallSite lt Func lt System Runtime CompilerServices CallSite  object  object gt  gt  Create Microsoft CSharp RuntimeBinder Binder GetMember 0  name  target GetType    new   Microsoft CSharp RuntimeBinder CSharpArgumentInfo Create 0 null          return site Target site  target       Add reference to Microsoft CSharp  Works also for dynamic types and private properties and fields   Edit  While this approach works  there is almost 20   faster method from the Microsoft VisualBasic dll assembly   public static object GetProperty object target  string name        return Microsoft VisualBasic CompilerServices Versioned CallByName target  name  CallType Get

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To get properties from dynamic doc when  GetType   returns null  try this   var keyValuePairs     System Collections Generic IDictionary lt string  object gt  doc   var val   keyValuePairs  propertyName   ToObject lt YourModel gt

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Much of the time when you ask for a dynamic object  you get an ExpandoObject  not in the question s anonymous-but-statically-typed example above  but you mention JavaScript and my chosen JSON parser JsonFx  for one  generates ExpandoObjects      If your dynamic is in fact an ExpandoObject  you can avoid reflection by casting it to IDictionary  as described at http   msdn microsoft com en-gb library system dynamic expandoobject aspx   Once you ve cast to IDictionary  you have access to useful methods like  Item and  ContainsKey

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The easiest method for obtaining both a setter and a getter for a property which works for any type including dynamic and ExpandoObject is to use FastMember which also happens to be the fastest method around  it uses Emit    You can either get a TypeAccessor based on a given type or an ObjectAccessor based of an instance of a given type   Example   var staticData   new Test   Id   1  Name    France     var objAccessor   ObjectAccessor Create staticData   objAccessor  Id   Should   Be 1   objAccessor  Name   Should   Be  France     var anonymous   new   Id   2  Name    Hilton     objAccessor   ObjectAccessor Create anonymous   objAccessor  Id   Should   Be 2   objAccessor  Name   Should   Be  Hilton     dynamic expando   new ExpandoObject    expando Id   3  expando Name    Monica   objAccessor   ObjectAccessor Create expando   objAccessor  Id   Should   Be 3   objAccessor  Name   Should   Be  Monica     var typeAccessor   TypeAccessor Create staticData GetType     typeAccessor staticData   Id   Should   Be 1   typeAccessor staticData   Name   Should   Be  France     typeAccessor   TypeAccessor Create anonymous GetType     typeAccessor anonymous   Id   Should   Be 2   typeAccessor anonymous   Name   Should   Be  Hilton     typeAccessor   TypeAccessor Create expando GetType       int typeAccessor expando   Id    Should   Be 3     string typeAccessor expando   Name    Should   Be  Monica

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In  Net core 3 1 you can try like this  d  value2   d  value3

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Once you have your PropertyInfo  from GetProperty   you need to call GetValue and pass in the instance that you want to get the value from  In your case   d GetType   GetProperty  value2   GetValue d  null

[c#] Get value of c# dynamic property via string

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