QiFeng.ZWY.MagWeb/Areas/HelpPage/SampleGeneration/ObjectGenerator.cs

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using System;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Globalization;
using System.Linq;
using System.Reflection;

namespace QiFeng.LMSD.MagWeb.Areas.HelpPage
{
    /// <summary>
    /// This class will create an object of a given type and populate it with sample data.
    /// </summary>
    public class ObjectGenerator
    {
        internal const int DefaultCollectionSize = 2;
        private readonly SimpleTypeObjectGenerator SimpleObjectGenerator = new SimpleTypeObjectGenerator();

        /// <summary>
        /// Generates an object for a given type. The type needs to be public, have a public default constructor and settable public properties/fields. Currently it supports the following types:
        /// Simple types: <see cref="int"/>, <see cref="string"/>, <see cref="Enum"/>, <see cref="DateTime"/>, <see cref="Uri"/>, etc.
        /// Complex types: POCO types.
        /// Nullables: <see cref="Nullable{T}"/>.
        /// Arrays: arrays of simple types or complex types.
        /// Key value pairs: <see cref="KeyValuePair{TKey,TValue}"/>
        /// Tuples: <see cref="Tuple{T1}"/>, <see cref="Tuple{T1,T2}"/>, etc
        /// Dictionaries: <see cref="IDictionary{TKey,TValue}"/> or anything deriving from <see cref="IDictionary{TKey,TValue}"/>.
        /// Collections: <see cref="IList{T}"/>, <see cref="IEnumerable{T}"/>, <see cref="ICollection{T}"/>, <see cref="IList"/>, <see cref="IEnumerable"/>, <see cref="ICollection"/> or anything deriving from <see cref="ICollection{T}"/> or <see cref="IList"/>.
        /// Queryables: <see cref="IQueryable"/>, <see cref="IQueryable{T}"/>.
        /// </summary>
        /// <param name="type">The type.</param>
        /// <returns>An object of the given type.</returns>
        public object GenerateObject(Type type)
        {
            return GenerateObject(type, new Dictionary<Type, object>());
        }

        [SuppressMessage("Microsoft.Design", "CA1031:DoNotCatchGeneralExceptionTypes", Justification = "Here we just want to return null if anything goes wrong.")]
        private object GenerateObject(Type type, Dictionary<Type, object> createdObjectReferences)
        {
            try
            {
                if (SimpleTypeObjectGenerator.CanGenerateObject(type))
                {
                    return SimpleObjectGenerator.GenerateObject(type);
                }

                if (type.IsArray)
                {
                    return GenerateArray(type, DefaultCollectionSize, createdObjectReferences);
                }

                if (type.IsGenericType)
                {
                    return GenerateGenericType(type, DefaultCollectionSize, createdObjectReferences);
                }

                if (type == typeof(IDictionary))
                {
                    return GenerateDictionary(typeof(Hashtable), DefaultCollectionSize, createdObjectReferences);