C# System.Collections.Specialized.NameValueCollection.GetKey方法代码示例

        private static void Member(JsonTextWriter writer, string name, NameValueCollection collection)
        {
            Debug.Assert(writer != null);
            Debug.AssertStringNotEmpty(name);

            //
            // Bail out early if the collection is null or empty.
            //

            if (collection == null || collection.Count == 0) 
                return;

            //
            // Save the depth, which we'll use to lazily emit the collection.
            // That is, if we find that there is nothing useful in it, then
            // we could simply avoid emitting anything.
            //

            var depth = writer.Depth;

            //
            // For each key, we get all associated values and loop through
            // twice. The first time round, we count strings that are 
            // neither null nor empty. If none are found then the key is 
            // skipped. Otherwise, second time round, we encode
            // strings that are neither null nor empty. If only such string
            // exists for a key then it is written directly, otherwise
            // multiple strings are naturally wrapped in an array.
            //

            var items = from i in Enumerable.Range(0, collection.Count)
                        let values = collection.GetValues(i)
                        where values != null && values.Length > 0
                        let some = // Neither null nor empty
                            from v in values
                            where !string.IsNullOrEmpty(v)
                            select v
                        let nom = some.Take(2).Count()
                        where nom > 0
                        select new
                        {
                            Key = collection.GetKey(i), 
                            IsArray = nom > 1, 
                            Values = some,
                        };
            
            foreach (var item in items)
            {
                //
                // There is at least one value so now we emit the key.
                // Before doing that, we check if the collection member
                // was ever started. If not, this would be a good time.
                //

                if (depth == writer.Depth)
                {
                    writer.Member(name);
                    writer.Object();
                }

                writer.Member(item.Key ?? string.Empty);

                if (item.IsArray)
                    writer.Array(); // Wrap multiples in an array

                foreach (var value in item.Values)
                    writer.String(value);

                if (item.IsArray) 
                    writer.Pop();   // Close multiples array
            }

            //
            // If we are deeper than when we began then the collection was
            // started so we terminate it here.
            //

            if (writer.Depth > depth)
                writer.Pop();
        }

        /// <summary>
        /// load collection with saved options from the xml config file
        /// </summary>
        private void InitSavedOptionsCollection(ref string ErrorMessage)
        {
            IEnumerable<System.Xml.Linq.XElement> SavedOptions;

            m_SaveOptionCollection = new System.Collections.Specialized.NameValueCollection();
            m_SaveOptionCollection.Add("RememberLastSurveyID", "");
            m_SaveOptionCollection.Add("TransectTotal", "");
            m_SaveOptionCollection.Add("StartX", "");
            m_SaveOptionCollection.Add("StartY", "");
            m_SaveOptionCollection.Add("MaxTransLineLength", "");
            m_SaveOptionCollection.Add("BlindAreaBuffer", "");
            m_SaveOptionCollection.Add("BufferDistance", "");
            m_SaveOptionCollection.Add("BufferFCName", "");
            m_SaveOptionCollection.Add("MinTransLineLength", "");
            m_SaveOptionCollection.Add("MaxElevation", "");
            m_SaveOptionCollection.Add("MaxSlope", "");
            m_SaveOptionCollection.Add("MinSlope", "");
            m_SaveOptionCollection.Add("ImportDataPath", "");
            m_SaveOptionCollection.Add("ExportDataPath", "");
            m_SaveOptionCollection.Add("GridPointSpacing", "");
            m_SaveOptionCollection.Add("TotalRandomPoints", "");
            m_SaveOptionCollection.Add("SurveyID", "");
            m_SaveOptionCollection.Add("DemFileLocation", "");

            SavedOptions = m_XMLConfig.Descendants("NPSConfig");
            foreach (System.Xml.Linq.XElement ThisOption in SavedOptions)
            {
                for (int Index = 0; Index < m_SaveOptionCollection.Keys.Count; Index++)
                {
                    if (m_SaveOptionCollection.GetKey(Index).ToLower() == ThisOption.Name.LocalName.ToLower())
                        m_SaveOptionCollection[m_SaveOptionCollection.GetKey(Index)] = ThisOption.Value;
                }
            }

            SavedOptions = m_XMLConfig.Descendants("StoredOptions");
            foreach (System.Xml.Linq.XElement ThisOption in SavedOptions)
            {
                for (int Index = 0; Index < m_SaveOptionCollection.Keys.Count; Index++)
                {
                    if (m_SaveOptionCollection.GetKey(Index).ToLower() == ThisOption.Name.LocalName.ToLower())
                        m_SaveOptionCollection[m_SaveOptionCollection.GetKey(Index)] = ThisOption.Value;
                }
            }
        }