[RESOLVED] how to reflect a variable name itself into a string
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Thread: [RESOLVED] how to reflect a variable name itself into a string

  1. #1
    Join Date
    Apr 2014
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    in northeast ohio
    Posts
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    [RESOLVED] how to reflect a variable name itself into a string

    ok so i was trying to get basically all the variables of a class into
    into a list or array of strings thru reflect then do more stuff
    but im stuck there, trying to get the name of a class feild into a string s

    for example
    Code:
    public class A
    {
        int someint = 0;
        public A(){}
        public void void aaaahhhHH()
        { 
            var t = new A();
            string s =  (  A.someint ?? reflect name stuck;   )
            ToConsole<A>(t,s);
        }
        public static void ToConsole<T>(T t, string s)
        {
            Type myTypeA = typeof(T);
            FieldInfo myFieldInfo = myTypeA.GetField(s);
            Console.WriteLine("The value of the public field {0} is: '{1}'",s ,myFieldInfo.GetValue(t));
        }
    }
    i know i could just type the name in but
    id like to use this on other class's and experiment with it a bit more
    Last edited by willmotil; June 17th, 2014 at 07:16 AM.

  2. #2
    Arjay's Avatar
    Arjay is offline Moderator / MS MVP Power Poster
    Join Date
    Aug 2004
    Posts
    11,485

    Re: how to reflect a variable name itself into a string

    Use reflection

    To retrieve property names
    http://www.csharp-examples.net/refle...roperty-names/

    Query for "use reflection to get properties names and values" to find out how to get and set values.

  3. #3
    Join Date
    Apr 2014
    Location
    in northeast ohio
    Posts
    86

    Re: how to reflect a variable name itself into a string

    Thanks for the link ArJay i used the activator create object to get a free method
    though i don't know how yet to check , if there is actually a public constructor on the type
    i was stuck for a minute on, getting the default value's for public field's that was set to the class from just the type
    (correct me if im wrong) i came to the conclusion you cant do it from just reflecting on the type

    the desired output i got at the bottom it doesn't include the properties or methods yet ect...
    and
    here's my console program in case anyone else found it interesting.
    Code:
    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using System.Threading.Tasks;
    using System.Reflection;
    
    namespace ReflectionConsoleTest
    {
        class Program
        {
            static string dline = "_________________________________________________";
            static string nline = Environment.NewLine;
    
            // some class ill test against
            public class SomeClass
            {
                public static string Name = "bob";
                public string Description = "Not much to describe maybe";
                public static int Height = 100;
                private static int Width = 50;
                private int Weight = 300;
            }
    
            // entry point
            static void Main(string[] args)
            {
                Console.WriteLine(dline + nline+"Get info of the class type" +nline + dline);
                // reflect
                ReflectionsInfo.GetInfoForClassType(typeof(SomeClass)); // reflect
                Console.WriteLine(dline + nline + "press a key to continue");
                Console.ReadLine();
    
                Console.WriteLine(dline + nline + "Get info of a instatiatable class itself via passing a constructable type" + nline + dline);
                // reflect
                ReflectionsInfo.GetInfoForClassTypeViaConstruction(typeof(SomeClass));
                Console.WriteLine(dline + nline + "press a key to continue");
                Console.ReadLine();
    
                SomeClass someclassobjinst = new SomeClass();
                SomeClass.Name = "Fred";
                someclassobjinst.Description = "Something to describe now";
    
                Console.WriteLine(dline + nline + "Get info of a object instantiation of the class" + nline + dline);
                // reflect
                ReflectionsInfo.GetInfoForClassObjectInstance<SomeClass>(someclassobjinst);
                Console.WriteLine(dline+ nline + "press a key to exit");
                Console.ReadLine();
            }
    
            // the utility class
            public static class ReflectionsInfo
            {
                public static void GetInfoForClassTypeViaConstruction(Type T)
                {
                    Object t = Activator.CreateInstance(T);
                    GetInfoForClassObjectInstance<Object>(t);
                }
    
                public static void GetInfoForClassObjectInstance<T>(T t)
                {
                    FieldInfo[] fields = t.GetType().GetFields
                        ( BindingFlags.Public 
                        | BindingFlags.NonPublic 
                        | BindingFlags.Static 
                        | BindingFlags.Instance
                        );
                    foreach (var field in fields)
                    {
                        string name = field.Name; 
                        object temp = field.GetValue(t);
                        ToConsole(temp,field, name);
                    }
                }
                
                public static void GetInfoForClassType(Type T)
                {
                    FieldInfo[] fields = T.GetFields
                        ( BindingFlags.Public
                        | BindingFlags.NonPublic
                        | BindingFlags.Static
                        );
                    foreach (var field in fields)
                    {
                        string name = field.Name;
                        object temp;
                        if (field.IsStatic)
                            temp = field.GetValue(name); // Get value
                        else
                            temp = null; // we never really get here, just in case set to null
                        ToConsole(temp,field, name);
                    }
                }
    
                public static void ToConsole(object temp,FieldInfo field, string name)
                {
                    // print out the data
                    if (field.IsPrivate)
                        Console.Write("private ");
                    if (field.IsPublic)
                        Console.Write("public ");
                    if (field.IsStatic)
                        Console.Write("static ");
                    if (temp != null)
                    {
                        // we cast according to temps type
                        if (temp is bool)
                        {
                            bool value = (bool)temp;
                            Console.WriteLine("bool " + name + " = " + value);
                        }
                        else if (temp is int)
                        {
                            int value = (int)temp;
                            Console.WriteLine("int " + name + " = " + value);
                        }
                        else if (temp is float)
                        {
                            float value = (float)temp;
                            Console.WriteLine("float " + name + " = " + value);
                        }
                        else if (temp is string)
                        {
                            string value = temp as string;
                            Console.WriteLine("string " + name + " = " + value);
                        }
                        else
                            Console.WriteLine(name + " = unspecified type of value to cast");
                    }
                    else
                    {
                        Console.WriteLine(name + " Failed to get value , dont think its possible this way ");
                    }
                    //_______
                }
            }
        }
    }
    Resulting console output from running the program
    Code:
    //_________________________________________________
    //Get info of the class type
    //_________________________________________________
    //public static (string) Name = bob
    //public static (int) Height = 100
    //private static (int) Width = 50
    //_________________________________________________
    //press a key to continue
    
    //_________________________________________________
    //Get info of a instatiatable class itself via passing a constructable type
    //_________________________________________________
    //public (string) Description = Not much to describe maybe
    //private (int) Weight = 300
    //public static (string) Name = bob
    //public static (int) Height = 100
    //private static (int) Width = 50
    //_________________________________________________
    //press a key to continue
    
    //_________________________________________________
    //Get info of a object instantiation of the class
    //_________________________________________________
    //public (string) Description = Something to describe now
    //private (int) Weight = 300
    //public static (string) Name = Fred
    //public static (int) Height = 100
    //private static (int) Width = 50
    //_________________________________________________
    //press a key to exit
    Amendment
    you can also get a basic Type description like so
    Code:
                /// <summary>
                /// Writes to console basic information about a Type
                /// usage MemberInfoToConsole( typeof(class_name) )
                /// class name refers to SomeClass not its string represention
                /// </summary>
                public static void MemberInfoToConsole(Type T)
                {
                    // get more info
                    var members = T.GetMembers();
                    Console.WriteLine("_____class_members_____");
                    foreach (var member in members)
                    {
                        var name = member.Name;
                        var val = member.MemberType;
                        Console.WriteLine("  " + val.ToString() + " " + name);
                    }
                    Console.WriteLine("_______________________");
                }
    Last edited by willmotil; June 23rd, 2014 at 03:00 AM. Reason: amendments

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