MVVM (Part 2) - Commanding


#region using

using System;
using System.Collections.Generic;
using System.Globalization;
using System.Xml;

#endregion using

namespace VvmScaffolding
{
	public class AppSetting
	{
		const string ConfigFile = "ServiceReferences.ClientConfig";

		#region 'base' GetAppSetting

		/// <summary>
		/// using an XML Reader enumerates the <add ..../> elements till it finds the one
		/// with the right 'key'
		/// </summary>
		/// <param name="strKey">the key</param>
		/// <returns>the value for that key</returns>
		static public string GetAppSetting(string strKey)
		{
			string strValue = string.Empty;
			var settings = new XmlReaderSettings();
			settings.XmlResolver = new XmlXapResolver();
			var reader = XmlReader.Create(ConfigFile);
			reader.MoveToContent();
			while (reader.Read())
			{
				if (reader.NodeType == XmlNodeType.Element)
				{
					if (reader.Name == "add")
					{
						if (reader.HasAttributes)
						{
							string fileKey = reader.GetAttribute("key");
							if ((string.IsNullOrEmpty(fileKey) == false) && (fileKey == strKey))
							{
								strValue = reader.GetAttribute("value");
								break;
							}
						}
					}
				}
			}
			return strValue;
		}

		#endregion 'base' GetAppSetting

		#region type specific GetAppSetting

		/// <summary>
		/// get the value for the specified key. if the key is not there returns the specified default value
		/// </summary>
		/// <param name="key">the specified key</param>
		/// <param name="defaultVal">the default value</param>
		/// <returns>the value found or the passed-in default value</returns>
		static public T GetAppSetting<T>(string key, T defaultVal)
		{
			T result = defaultVal;
			try
			{
				string sVal = GetAppSetting(key);
				if (string.IsNullOrEmpty(sVal) == false)
				{
					result = (T)Convert.ChangeType(sVal, typeof(T), new CultureInfo("en-US"));
				}
			}
			catch
			{
				result = defaultVal;
			}
			return result;
		}


		#endregion type specific GetAppSetting

		#region GetMenuItems

		/// <summary>
		/// using an XML Reader enumerates all the <MenuItem ..../> elements
		/// for each one it create and populate a class that contains the 
		/// Name View and ViewModel and adds it to a list.
		/// </summary>
		/// <returns>a list that contains all the triplets</returns>
		static public List<ThreeSringHolder> GetMenuItems()
		{
			var list = new List<ThreeSringHolder>();
			var settings = new XmlReaderSettings();
			settings.XmlResolver = new XmlXapResolver();
			var reader = XmlReader.Create(ConfigFile);
			reader.MoveToContent();
			while (reader.Read())
			{
				if (reader.NodeType == XmlNodeType.Element)
				{
					if (reader.Name == "MenuItem")
					{
						string d = reader.GetAttribute("Name");
						string v = reader.GetAttribute("View");
						string vm = reader.GetAttribute("ViewModel");
						var item = new ThreeSringHolder(d, v, vm);
						list.Add(item);
					}
					else
					{
						if (list.Count > 0)
						{
							break;
						}
					}
				}
			}
			return list;
		}

		#endregion GetMenuItems
	}

	#region ThreeSringHolder class

	public class ThreeSringHolder
	{
		public string Name { get; set; }
		public string View { get; set; }
		public string ViewModel { get; set; }

		public ThreeSringHolder()
		{
			Name = string.Empty;
			View = string.Empty;
			ViewModel = string.Empty;
		}

		public ThreeSringHolder(string d, string v, string vm)
		{
			Name = d;
			View = v;
			ViewModel = vm;
		}
	}

	#endregion ThreeSringHolder class
}