hashtable的应用

Code

public enum InstrumentType
    {
        Guitar,
        Mandolin,
        BanJo
    }
    public enum Builder
    {
        me,
        you,
        he
    }
    public enum Strings
    {
        five,
        seven,
        eight,
        eleven
    }

    public class InstrumentSpec
    {
        private Hashtable properties;
        public InstrumentSpec(Hashtable _properties)
        {
            if (_properties == null)
            {
                this.properties = new Hashtable();
            }
            else
            {
                properties = new Hashtable(_properties);
            }
        }
        //注意这里返回值是object说明字典在存储过程中将value装箱了
        public object Getproperty(string name)
        {
            return properties[name];
        }
        public Hashtable GetPorperties()
        {
            return properties;
        }
        public bool match(InstrumentSpec otherSpec)
        {
            Hashtable otherproperties = otherSpec.GetPorperties();
            foreach (DictionaryEntry de in otherproperties)
            {
                //因此这里比较的时候要tostring()
                if (properties[de.Key].ToString() != otherproperties[de.Key].ToString())
                {
                    return false;
                }
            }
            return true;
        }
    }
    public class Invention
    {
        public List<InstrumentSpec> collections=new List<InstrumentSpec>();
        public void addInstrument(InstrumentSpec spec)
        {
            collections.Add(spec);
        }
        public void initial(Invention invention)
        {
            Hashtable properties = new Hashtable();
            properties.Add("instrumentType", InstrumentType.BanJo);
            properties.Add("builder",Builder.he);
            properties.Add("strings",Strings.eight);
            invention.addInstrument(new InstrumentSpec(properties));
            Hashtable properties1 = new Hashtable();
            properties1.Add("instrumentType",InstrumentType.Guitar);
            properties1.Add("builder",Builder.me);
            properties1.Add("strings",Strings.eight);
            invention.addInstrument(new InstrumentSpec(properties1));
            Hashtable properties2 = new Hashtable();
            properties2.Add("instrumentType",InstrumentType.BanJo);
            properties2.Add("builder",Builder.he);
            properties2.Add("strings",Strings.eleven);
            invention.addInstrument(new InstrumentSpec(properties2));
        }
    }
    

    class Program
    {
        static void Main(string[] args)
        {
            Invention invention = new Invention();
            Hashtable properties = new Hashtable();
            properties.Add("instrumentType", InstrumentType.BanJo);
            properties.Add("builder", Builder.he);
            properties.Add("strings", Strings.eight);
            invention.addInstrument(new InstrumentSpec(properties));
            Hashtable properties1 = new Hashtable();
            properties1.Add("instrumentType", InstrumentType.Guitar);
            properties1.Add("builder", Builder.me);
            properties1.Add("strings", Strings.eight);
            invention.addInstrument(new InstrumentSpec(properties1));
            Hashtable properties2 = new Hashtable();
            properties2.Add("instrumentType", InstrumentType.BanJo);
            properties2.Add("builder", Builder.he);
            properties2.Add("strings", Strings.eleven);
            invention.addInstrument(new InstrumentSpec(properties2));
            Hashtable otherpro = new Hashtable();
            otherpro.Add("instrumentType", InstrumentType.BanJo);
            
            
            foreach (DictionaryEntry de in otherpro)
            {
                Console.WriteLine(otherpro[de.Key]);
                
                
            }
            Console.WriteLine("");
            InstrumentSpec otherSpec = new InstrumentSpec(otherpro);
            foreach (InstrumentSpec i in invention.collections)
            {

                if (i.match(otherSpec))
                {
                    Console.WriteLine("i can found this for you:");
                    Hashtable properties3 = i.GetPorperties();
                    foreach (DictionaryEntry de in properties3)
                    {
                        Console.WriteLine("{0}:{1}",de.Key,i.Getproperty(de.Key.ToString()));

                    }
                    Console.WriteLine("");
                }
            }
        }
    }

 

Code
using System;
using System.Collections;

class Example
{
    public static void Main()
    {
        // Create a new hash table.
        //
        Hashtable openWith = new Hashtable();

        // Add some elements to the hash table. There are no 
        // duplicate keys, but some of the values are duplicates.
        openWith.Add("txt", "notepad.exe");
        openWith.Add("bmp", "paint.exe");
        openWith.Add("dib", "paint.exe");
        openWith.Add("rtf", "wordpad.exe");

        // The Add method throws an exception if the new key is 
        // already in the hash table.
        try
        {
            openWith.Add("txt", "winword.exe");
        }
        catch
        {
            Console.WriteLine("An element with Key = \"txt\" already exists.");
        }

        // The Item property is the default property, so you 
        // can omit its name when accessing elements. 
        Console.WriteLine("For key = \"rtf\", value = {0}.", openWith["rtf"]);

        // The default Item property can be used to change the value
        // associated with a key.
        openWith["rtf"] = "winword.exe";
        Console.WriteLine("For key = \"rtf\", value = {0}.", openWith["rtf"]);

        // If a key does not exist, setting the default Item property
        // for that key adds a new key/value pair.
        openWith["doc"] = "winword.exe";

        // ContainsKey can be used to test keys before inserting 
        // them.
        if (!openWith.ContainsKey("ht"))
        {
            openWith.Add("ht", "hypertrm.exe");
            Console.WriteLine("Value added for key = \"ht\": {0}", openWith["ht"]);
        }

        // When you use foreach to enumerate hash table elements,
        // the elements are retrieved as KeyValuePair objects.
        Console.WriteLine();
        foreach( DictionaryEntry de in openWith )
        {
            Console.WriteLine("Key = {0}, Value = {1}", de.Key, de.Value);
        }

        // To get the values alone, use the Values property.
        ICollection valueColl = openWith.Values;

        // The elements of the ValueCollection are strongly typed
        // with the type that was specified for hash table values.
        Console.WriteLine();
        foreach( string s in valueColl )
        {
            Console.WriteLine("Value = {0}", s);
        }

        // To get the keys alone, use the Keys property.
        ICollection keyColl = openWith.Keys;

        // The elements of the KeyCollection are strongly typed
        // with the type that was specified for hash table keys.
        Console.WriteLine();
        foreach( string s in keyColl )
        {
            Console.WriteLine("Key = {0}", s);
        }

        // Use the Remove method to remove a key/value pair.
        Console.WriteLine("\nRemove(\"doc\")");
        openWith.Remove("doc");

        if (!openWith.ContainsKey("doc"))
        {
            Console.WriteLine("Key \"doc\" is not found.");
        }
    }
}

/* This code example produces the following output:

An element with Key = "txt" already exists.
For key = "rtf", value = wordpad.exe.
For key = "rtf", value = winword.exe.
Value added for key = "ht": hypertrm.exe

Key = dib, Value = paint.exe
Key = txt, Value = notepad.exe
Key = ht, Value = hypertrm.exe
Key = bmp, Value = paint.exe
Key = rtf, Value = winword.exe
Key = doc, Value = winword.exe

Value = paint.exe
Value = notepad.exe
Value = hypertrm.exe
Value = paint.exe
Value = winword.exe
Value = winword.exe

Key = dib
Key = txt
Key = ht
Key = bmp
Key = rtf
Key = doc

Remove("doc")
Key "doc" is not found.
 */