Gets a string representation of the mappings in a dictionary. - CSharp System.Collections

CSharp examples for System.Collections:IDictionary

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Description

Gets a string representation of the mappings in a dictionary.

Demo Code


using System.Collections.Generic;
using System.Collections;
using System;/*from   w  w w . j a v a 2s.c  o m*/

public class Main{
        /// <summary>
        /// Gets a string representation of the mappings in a dictionary.
        /// The string representation starts with "{", has a list of mappings separated
        /// by commas (", "), and ends with "}". Each mapping is represented
        /// by "key->value". Each key and value in the dictionary is 
        /// converted to a string by calling its ToString method (null is represented by "null").
        /// Contained collections (except strings) are recursively converted to strings by this method.
        /// </summary>
        /// <param name="dictionary">A dictionary to get the string representation of.</param>
        /// <returns>The string representation of the collection, or "null" 
        /// if <paramref name="dictionary"/> is null.</returns>
        internal static string ToString<TKey, TValue>(IDictionary<TKey, TValue> dictionary)
        {
            bool firstItem = true;

            if (dictionary == null)
                return "null";

            System.Text.StringBuilder builder = new System.Text.StringBuilder();

            builder.Append("{");

            // Call ToString on each item and put it in.
            foreach (KeyValuePair<TKey, TValue> pair in dictionary) {
                if (!firstItem)
                    builder.Append(", ");

                if (pair.Key == null)
                    builder.Append("null");
               
                else
                    builder.Append(pair.Key.ToString());

                builder.Append("->");

                if (pair.Value == null)
                    builder.Append("null");
               
                else
                    builder.Append(pair.Value.ToString());


                firstItem = false;
            }

            builder.Append("}");
            return builder.ToString();
        }
        #region String representations

        /// <summary>
        /// Gets a string representation of the elements in the collection.
        /// The string representation starts with "{", has a list of items separated
        /// by commas (","), and ends with "}". Each item in the collection is 
        /// converted to a string by calling its ToString method (null is represented by "null").
        /// Contained collections (except strings) are recursively converted to strings by this method.
        /// </summary>
        /// <param name="collection">A collection to get the string representation of.</param>
        /// <returns>The string representation of the collection. If <paramref name="collection"/> is null, then the string "null" is returned.</returns>
        internal static string ToString<T>(IEnumerable<T> collection)
        {
            return collection.GetType().Name;// ToString(collection);
        }
}

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