C# Dictionary.GetValueOrDefault方法代码示例

        public void throws_formatexception_when_value_cannot_be_parsed()
        {
            var dictionary = new Dictionary<string, string> { { "ID", "abc123" } };

            Expect(() => dictionary.GetValueOrDefault<int>("ID"), Throws.TypeOf<FormatException>());
        }

        public void throws_invalidcastexception_when_value_is_null_for_value_type()
        {
            var dictionary = new Dictionary<string, string> { { "length", null } };

            Expect(() => dictionary.GetValueOrDefault<int>("length"), Throws.TypeOf<InvalidCastException>());
        }

        public void does_not_throw_invalidcastexception_when_value_is_null_for_reference_type()
        {
            var dictionary = new Dictionary<string, string> { { "length", null } };

            var value = dictionary.GetValueOrDefault<ApplicationException>("length");

            Expect(value, Is.Null);
        }

        public void get_datetime_from_other_culture()
        {
            var collection = new Dictionary<string, string> { { "startDate", "05/04/2012 00:00:00" } };

            var value = collection.GetValueOrDefault<DateTime>("startDate");

            Expect(value, Is.EqualTo(new DateTime(2012, 5, 4)));
        }

        public void throws_invalidcastexception_when_type_is_not_supported()
        {
            var dictionary = new Dictionary<string, string> { { "length", "1:10:10" } };

            Expect(() => dictionary.GetValueOrDefault<TimeSpan>("length"), Throws.TypeOf<InvalidCastException>());
        }

        public void get_int()
        {
            var collection = new Dictionary<string, string> { { "appId", "123" } };

            var value = collection.GetValueOrDefault<int>("appId");

            Expect(value, Is.EqualTo(123));
        }

        public void get_decimal_from_other_culture()
        {
            var collection = new Dictionary<string, string> { { "appId", "1.23" } };

            var value = collection.GetValueOrDefault<decimal>("appId");

            Expect(value, Is.EqualTo(1.23m));
        }

        private static Dictionary<string, string> InitializeNameMappings(ConfigNode nameMappingNode)
        {
            Contract.Assert(nameMappingNode != null, "No name mappings");
            Contract.Assert(String.Compare(nameMappingNode.Name, "cryptoNameMapping", StringComparison.Ordinal) == 0, "Invalid name mapping root");

            Dictionary<string, string> nameMappings = new Dictionary<string, string>();
            Dictionary<string, string> typeAliases = new Dictionary<string, string>();

            // find the cryptoClases element
            foreach (ConfigNode node in nameMappingNode.Children)
            {
                if (String.Compare(node.Name, "cryptoClasses", StringComparison.Ordinal) == 0)
                {
                    foreach(ConfigNode cryptoClass in node.Children)
                    {
                        if (String.Compare(cryptoClass.Name, "cryptoClass", StringComparison.Ordinal) == 0)
                        {
                            if (cryptoClass.Attributes.Count > 0)
                            {
                                DictionaryEntry attribute = (DictionaryEntry)cryptoClass.Attributes[0];
                                typeAliases.Add((string)attribute.Key, (string)attribute.Value);
                            }
                        }
                    }
                }
                else if(String.Compare(node.Name, "nameEntry", StringComparison.Ordinal) == 0)
                {
                    string friendlyName = null;
                    string className = null;

                    foreach(DictionaryEntry attribute in node.Attributes)
                    {
                        if(String.Compare((string)attribute.Key, "name", StringComparison.Ordinal) == 0)
                            friendlyName = (string)attribute.Value;
                        else if(String.Compare((string)attribute.Key, "class", StringComparison.Ordinal) == 0)
                            className = (string)attribute.Value;
                    }

                    if (friendlyName != null && className != null)
                    {
                        string typeName = typeAliases.GetValueOrDefault(className);
                        if (typeName != null)
                            nameMappings.Add(friendlyName, typeName);
                    }
                }
            }

            return nameMappings;
        }

        public DisplayPreferences(string id, Folder folder)
        {
            this.Id = new Guid(id);
            Folder = folder;

            ArrayList list = new ArrayList();
            foreach (ViewType v in Enum.GetValues(typeof(ViewType)))
                list.Add(ViewTypeNames.GetName(v));
            viewType.Options = list;

            try
            {
                this.viewType.Chosen = folder.DisplayPreferences != null ? folder.DisplayPreferences.ViewType ?? Config.Instance.DefaultViewType.ToString() : Config.Instance.DefaultViewType.ToString();
            }
            catch (ArgumentException)
            {
                Logging.Logger.ReportError("Invalid view type stored for {0}.  Setting to Poster.", folder.Name ?? folder.GetType().Name);
                viewType.Chosen = Localization.LocalizedStrings.Instance.GetString("PosterDispPref");
            }

            //set our dynamic choice options
            this.sortDict = folder.SortOrderOptions;
            this.sortOrders.Options = sortDict.Keys.ToArray();
            this.indexDict = folder.IndexByOptions;
            this.indexBy.Options = folder.IndexByOptions.Keys.ToArray();
 
            verticalScroll = new BooleanChoice {Value = folder.DisplayPreferences != null && folder.DisplayPreferences.ScrollDirection == ScrollDirection.Vertical};

            useBanner = new BooleanChoice();

            showLabels = new BooleanChoice();

            useCoverflow = new BooleanChoice {Value = false};

            useBackdrop = new BooleanChoice {Value = folder.DisplayPreferences != null ? folder.DisplayPreferences.ShowBackdrop : Config.Instance.ShowBackdrop};

            if (folder.DisplayPreferences != null)
            {
                var width = folder.DisplayPreferences.PrimaryImageWidth > 0 ? folder.DisplayPreferences.PrimaryImageWidth : Config.Instance.DefaultPosterSize.Width;
                var height = folder.DisplayPreferences.PrimaryImageHeight > 0 ? folder.DisplayPreferences.PrimaryImageHeight : Config.Instance.DefaultPosterSize.Height;
            
                customParms = folder.DisplayPreferences.CustomPrefs ?? new Dictionary<string, string>();
                thumbConstraint = new SizeRef(new Size(width, height));
                useBanner.Value = (customParms.GetValueOrDefault("MBCUseBanner", "false") == "true");
                showLabels.Value = (customParms.GetValueOrDefault("MBCShowLabels", "false") == "true");
                try
                {
                    if (Config.Instance.RememberIndexing) indexBy.Chosen = folder.DisplayPreferences.IndexBy;
                }
                catch
                {
                    indexBy.Chosen = Localization.LocalizedStrings.Instance.GetString("NoneDispPref");
                }
            }

            try
            {
                sortOrders.Chosen = folder.DisplayPreferences != null ? folder.DisplayPreferences.SortBy ?? "Name" : "Name";
            }
            catch (ArgumentException)
            {
                Logging.Logger.ReportError("Invalid sort by stored for {0}.  Setting to Name.", folder.Name ?? folder.GetType().Name);
                sortOrders.Chosen = Localization.LocalizedStrings.Instance.GetString("NameDispPref");
            }

            ListenForChanges();
        }

 private static Dictionary<string, string> InitializeNameMappings(ConfigNode nameMappingNode)
 {
     Dictionary<string, string> dictionary = new Dictionary<string, string>();
     Dictionary<string, string> dictionary2 = new Dictionary<string, string>();
     foreach (ConfigNode node in nameMappingNode.Children)
     {
         if (string.Compare(node.Name, "cryptoClasses", StringComparison.Ordinal) == 0)
         {
             foreach (ConfigNode node2 in node.Children)
             {
                 if ((string.Compare(node2.Name, "cryptoClass", StringComparison.Ordinal) == 0) && (node2.Attributes.Count > 0))
                 {
                     DictionaryEntry entry = node2.Attributes[0];
                     dictionary2.Add((string) entry.Key, (string) entry.Value);
                 }
             }
         }
         else if (string.Compare(node.Name, "nameEntry", StringComparison.Ordinal) == 0)
         {
             string key = null;
             string str2 = null;
             foreach (DictionaryEntry entry2 in node.Attributes)
             {
                 if (string.Compare((string) entry2.Key, "name", StringComparison.Ordinal) == 0)
                 {
                     key = (string) entry2.Value;
                 }
                 else if (string.Compare((string) entry2.Key, "class", StringComparison.Ordinal) == 0)
                 {
                     str2 = (string) entry2.Value;
                 }
             }
             if ((key != null) && (str2 != null))
             {
                 string valueOrDefault = dictionary2.GetValueOrDefault(str2);
                 if (valueOrDefault != null)
                 {
                     dictionary.Add(key, valueOrDefault);
                 }
             }
         }
     }
     return dictionary;
 }

        public async Task<IList<Game.AiCar>> GenerateGameEntries(CancellationToken cancellation = default(CancellationToken)) {
            if (IsBusy) {
                await RebuildGridAsync();
                if (cancellation.IsCancellationRequested) return null;
            }

            var opponentsNumber = OpponentsNumberLimited;
            if (FilteredView.Count == 0 || opponentsNumber == 0) {
                return new Game.AiCar[0];
            }

            var skins = new Dictionary<string, GoodShuffle<CarSkinObject>>();
            foreach (var car in FilteredView.OfType<RaceGridEntry>().Where(x => x.CarSkin == null).Select(x => x.Car).Distinct()) {
                await car.SkinsManager.EnsureLoadedAsync();
                if (cancellation.IsCancellationRequested) return null;

                skins[car.Id] = GoodShuffle.Get(car.EnabledOnlySkins);
            }

            NameNationality[] nameNationalities;
            if (opponentsNumber == 7 && OptionNfsPorscheNames) {
                nameNationalities = new[] {
                        new NameNationality { Name = "Dylan", Nationality = "Wales" },
                        new NameNationality { Name = "Parise", Nationality = "Italy" },
                        new NameNationality { Name = "Steele", Nationality = "United States" },
                        new NameNationality { Name = "Wingnut", Nationality = "England" },
                        new NameNationality { Name = "Leadfoot", Nationality = "Australia" },
                        new NameNationality { Name = "Amazon", Nationality = "United States" },
                        new NameNationality { Name = "Backlash", Nationality = "United States" }
                    };
            } else if (DataProvider.Instance.NationalitiesAndNames.Any()) {
                nameNationalities = GoodShuffle.Get(DataProvider.Instance.NationalitiesAndNamesList).Take(opponentsNumber).ToArray();
            } else {
                nameNationalities = null;
            }

            List<int> aiLevels;
            if (AiLevelFixed) {
                aiLevels = null;
            } else {
                var aiLevelsInner = from i in Enumerable.Range(0, opponentsNumber)
                                    select AiLevelMin + (int)((opponentsNumber < 2 ? 1f : 1f - (float)i / (opponentsNumber - 1)) * (AiLevel - AiLevelMin));
                if (AiLevelArrangeReverse) {
                    aiLevelsInner = aiLevelsInner.Reverse();
                }

                if (Equals(AiLevelArrangeRandom, 1d)) {
                    aiLevelsInner = GoodShuffle.Get(aiLevelsInner);
                } else if (AiLevelArrangeRandom > 0d) {
                    aiLevelsInner = LimitedShuffle.Get(aiLevelsInner, AiLevelArrangeRandom);
                }
                
                aiLevels = aiLevelsInner.Take(opponentsNumber).ToList();
                Logging.Debug("AI levels: " + aiLevels.Select(x => [email protected]"{x}%").JoinToString(@", "));
            }

            IEnumerable<RaceGridEntry> final;
            if (Mode.CandidatesMode) {
                var list = FilteredView.OfType<RaceGridEntry>().SelectMany(x => new[] { x }.Repeat(x.CandidatePriority)).ToList();

                if (ShuffleCandidates) {
                    var shuffled = GoodShuffle.Get(list);

                    if (_playerCar != null) {
                        var same = list.FirstOrDefault(x => x.Car == _playerCar);
                        if (same != null) {
                            shuffled.IgnoreOnce(same);
                        }
                    }

                    final = shuffled.Take(OpponentsNumberLimited);
                } else {
                    var skip = _playerCar;
                    final = LinqExtension.RangeFrom().Select(x => list.RandomElement()).Where(x => {
                        if (x.Car == skip) {
                            skip = null;
                            return false;
                        }

                        return true;
                    }).Take(OpponentsNumberLimited);
                }
            } else {
                final = NonfilteredList.Where(x => !x.SpecialEntry);
            }

            if (_playerCar != null) {
                skins.GetValueOrDefault(_playerCar.Id)?.IgnoreOnce(_playerCar.SelectedSkin);
            }

            var takenNames = new List<string>(OpponentsNumberLimited);

            return final.Take(OpponentsNumberLimited).Select((entry, i) => {
                var level = entry.AiLevel ?? aiLevels?[i] ?? 100;

                var skin = entry.CarSkin;
                if (skin == null) {
                    skin = skins.GetValueOrDefault(entry.Car.Id)?.Next;
                }

//.........这里部分代码省略.........

        public void get_null_string_with_default()
        {
            var collection = new Dictionary<string, string> { { "app id", null } };

            var value = collection.GetValueOrDefault("app id", "a default value");

            Expect(value, Is.Null);
        }