configfile.cs

一个通用的数据库访问层

using System;
using System.IO;
using System.Windows.Forms;
using System.Runtime.Serialization.Formatters.Soap;

namespace YariSoft.Utils
{
	public class ConfigFile
	{
		#region Local variables
		private string _fileName		= "";
		protected object _configObject	= null;
		#endregion

		#region Properties
		public object ConfigObject
		{
			get{ return _configObject; }
			set{ this._configObject = value; }
		}

		public string FileName
		{
			get{ return this._fileName; }
			set{ this._fileName = value; }
		}
		#endregion

		#region Constructor/Destructor
		public ConfigFile()
		{
		}
		#endregion

		#region Public functions
		public static bool SaveToFile( ref string FileName, object ObjectToSave, bool ShowDialog )
		{
			bool status = false;
			try{
				YariSoft.Utils.ConfigFile info = new YariSoft.Utils.ConfigFile();
				info.ConfigObject = ObjectToSave;
				info.FileName = FileName;
				if( ShowDialog ){
					status = info.SaveAs();
					FileName = info.FileName;
				} else {
					status = info.Save();
				}
			}catch( Exception Exp ){
				YariSoft.Utils.YMessages.Show( Exp.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error );
				return false;
			}
			return status;
		}

		public static object LoadFromFile( ref string FileName, bool ShowDialog )
		{
			object result = null;
			try{
				YariSoft.Utils.ConfigFile info = new YariSoft.Utils.ConfigFile();
				info.FileName = FileName;
				bool status;
				if( ShowDialog ){
					status = info.OpenAs();
				}else{
					status = info.Open();
				}
				if( status ){
					result = info.ConfigObject;
					FileName = info.FileName;
				}
			}catch( Exception Exp ){
				YariSoft.Utils.YMessages.Show( Exp.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error );
				return null;
			}
			return result;
		}


		virtual public bool SaveAs ()
		{
			SaveFileDialog Dialog = new SaveFileDialog();
			
			bool status		= false;
			Dialog.FileName = this._fileName;

			if( Dialog.ShowDialog() == DialogResult.OK ){
				this._fileName = Dialog.FileName;
				status = this.Save();
			}

			Dialog.Dispose();
			return status;
		}

		virtual public bool Save ()
		{
			if( this._configObject == null ){
				YariSoft.Utils.YMessages.Show( "Object for save operation was not initialized!", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error );
				return false;
			}
			if( this._fileName == "" ){
				return this.SaveAs();	
			}
			Stream stream = null;
			try {
				stream = (Stream)File.Open( this._fileName, FileMode.Create, FileAccess.Write );
				SoapFormatter formatter = new SoapFormatter();
				formatter.Serialize( stream, this._configObject );
				stream.Close();
			}catch( Exception Exp ){
				YariSoft.Utils.YMessages.Show( Exp.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error );
				if( stream != null ){
					stream.Close();
				}
				return false;
			}
			return true;
		}

		virtual public bool OpenAs()
		{
			return this.OpenAs("");
		}

		virtual public bool OpenAs( string FileExtFilter )
		{
			OpenFileDialog Dialog = new OpenFileDialog();
			if( FileExtFilter != "" ){
				Dialog.Filter = FileExtFilter;
			}
			bool status = false;

			if( Dialog.ShowDialog() == DialogResult.OK ){
				this._fileName = Dialog.FileName;
				status = this.Open();
			}

			Dialog.Dispose();
			return status;
		}

		virtual public bool Open()
		{
			if( this._fileName == "" ){
				return false;
			}

			FileInfo info = new FileInfo( this._fileName );
			if( ! info.Exists ){
				return false;
			}

			Stream stream = null;
			try{
				stream = (Stream)File.Open( this._fileName, FileMode.Open, FileAccess.Read );
				SoapFormatter formatter = new SoapFormatter ();
				this._configObject = formatter.Deserialize( stream );
				stream.Close();
			}catch( Exception Exp ){
				YariSoft.Utils.YMessages.Show( Exp.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error );
				if( stream != null ){
					stream.Close();
				}
				return false;
			}

			return true;
		}
		#endregion
	}
}