c# - How to access a dynamic object's property dynamically (by variable)? -

i have class named configurationwhich inherits dynamicobject. it dictionary<string, object>. in constructor, reads text file , loads values splitted =, can create dynamic configuration objects this:

dynamic configuration = new configuration("some_file.ini"); 

here full class:

public sealed class configuration : dynamicobject {     private string path { get; set; }     private dictionary<string, object> dictionary { get; set; }      public configuration(string filename)     {         this.path = filename;         this.dictionary = new dictionary<string, object>();          this.populate();     }      ~configuration()     {         if (this.dictionary != null)         {             this.dictionary.clear();         }     }      private void populate()     {         using (streamreader reader = new streamreader(this.path))         {             string line;             string currentsection = string.empty;              while ((line = reader.readline()) != null)             {                 if (string.isnullorwhitespace(line))                 {                     continue;                 }                  if (line.startswith("[") && line.endswith("]"))                 {                     currentsection = line.trim('[', ']');                 }                 else if (line.contains("="))                 {                     this.dictionary.add(string.format("{0}{1}{2}",                         currentsection,                         (currentsection != string.empty) ? "_" : string.empty,                         line.split('=')[0].trim()),                         parsevalue(line.split('=')[1].trim().split(';')[0]));                 }             }         }     }      private object parsevalue(string value)     {         if (string.isnullorwhitespace(value))             return string.empty;          if (value.startswith("\"") && value.endswith("\""))             return value.substring(1, value.length - 1);          if (isnumeric(value))             return convert.toint32(value);          // todo: fixme floating values (not confuse ipaddress).         //if (isfloating(value))         //    return convert.todouble(value);          if (string.compare(value, "true", stringcomparison.ordinalignorecase) == 0)             return true;          if (string.compare(value, "false", stringcomparison.ordinalignorecase) == 0)             return false;          return value;     }      public override bool trygetmember(getmemberbinder binder, out object result)     {         if (this.dictionary.containskey(binder.name))         {             if (this.dictionary[binder.name] == null)             {                 result = null;             }             else             {                 result = this.dictionary[binder.name];             }              return true;         }          throw new configurationexception(binder.name);     }      public override string tostring()     {         string result = this.path + " [ ";          int processed = 0;          foreach (keyvaluepair<string, object> value in this.dictionary)         {             result += value.key;             processed++;              if (processed < this.dictionary.count)             {                 result += ", ";             }         }          result += " ]";          return result;     }      private static bool isnumeric(string value)     {         foreach (char c in value)             if (!char.isdigit(c))                 return false;          return true;     }     private static bool isfloating(string value)     {         foreach (char c in value)             if (!char.isdigit(c) && c != '.')                 return false;          return true;     }      private class nullobject { } } 

everything working flawlessly. i've overriden trygetmember , i'm returning object based on getmemberbinder name property. however, i'm facing problem.

when execute following code:

string s = "some_config_key";  string d = configuration.s; 

it retrieves value of key s rather some_config_key, meaning doesn't evalute value of variable s. there workaround this?

thanks.

c# dynamic features partially compiled property/method access. understand lets take example.

dynamic myvar = new { a=1, b="test" }; myvar.a += 1; 

here c# type system not test validity of property while compilation, @ runtime code executed , if property not found through runtime error.

so in code property access complied access property named "s" on dynamic object "configuration".

in c# no-way can not in dynamically typed languages python or javascript.

you have use this.

dynamic configuration = getconfig("path/to/file"); var myobj = configuration idictionary<string,object>; string s = "config_key"; var value = myobj[s]; // correct.