122 lines
3.2 KiB
C#
122 lines
3.2 KiB
C#
using System;
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using System.IO;
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using System.Text;
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using System.Xml.Serialization;
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namespace DeviceTest
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{
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/// <summary>
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/// Class to be serialized to an XML file...
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/// </summary>
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[XmlRootAttribute("DeviceTest")]
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public class LocalSettings
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{
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public string ParentClassName;
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public string ParentName;
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public string ParentSettings;
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public string ComponentClassName;
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public string ComponentName;
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public string ComponentParentName;
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public string ComponentSettings;
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public string Component2ClassName;
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public string Component2Name;
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public string Component2ParentName;
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public string Component2Settings;
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public LocalSettings()
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{
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}
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/// <summary>
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/// Load public fields of this class from the XML file.
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/// </summary>
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/// <returns>LocalSettings object or null when Load() fails</returns>
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public static LocalSettings Load(string fileName)
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{
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try
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{
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using (TextReader reader = new StreamReader(fileName))
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{
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LocalSettings ls = (new XmlSerializer(typeof(LocalSettings))).Deserialize(reader) as LocalSettings;
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// Copy the settings just in case De-serialize() completes OK
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return ls;
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}
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}
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catch (Exception e)
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{
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string msg = e.Message;
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return null;
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}
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}
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/// <summary>
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/// Save public fields of this class to the XML file.
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/// </summary>
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public void Save()
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{
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try
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{
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using (TextWriter writer = new StreamWriter(Program.LocalSettingsFileName))
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{
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(new XmlSerializer(typeof(LocalSettings))).Serialize(writer, this);
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}
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}
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catch (Exception e)
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{
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string msg = e.Message;
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}
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}
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/// <summary>
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/// Updates history stored in a string array by a new latest string.
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/// </summary>
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/// <param name="lastStrValue">Last entered string</param>
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/// <returns>true = updated and saved</returns>
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public bool UpdateHistory(string lastStrValue, ref string[] history)
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{
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const int MaxHistoryLen = 10;
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if (string.IsNullOrEmpty(lastStrValue)) return false;
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int currentHistoryLength = (history != null) ? history.Length : 0;
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int match = -1;
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for (int i = 0; i < currentHistoryLength; i++)
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{
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if (history[i] == lastStrValue)
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{
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match = i;
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break;
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}
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}
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if (match >= 0 || currentHistoryLength >= MaxHistoryLen)
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{
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/// History does not have to be extended (because of a match) or should not be extended (because of the lenght)
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if (match < 0) match = currentHistoryLength - 1;
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for (int j = match; j > 0; j--)
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{
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history[j] = history[j - 1];
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}
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history[0] = lastStrValue;
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}
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else
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{
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/// History will be extended, new item inserted at the beginning
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string[] newHistory = new string[currentHistoryLength + 1];
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newHistory[0] = lastStrValue;
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for (int j = 1; j <= currentHistoryLength; j++)
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{
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newHistory[j] = history[j - 1];
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}
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history = newHistory;
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}
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Save();
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return true;
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}
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}
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}
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