XmlConnection

答案：using System;
using System.ComponentModel;
using System.Data;
using System.Xml;

namespace System.Data.XmlClient
{

  public class XmlConnection : Component, IDbConnection, ICloneable
    {
    // Constructors
        public XmlConnection()
        {
        }

    public XmlConnection(string connectionString)
    {
      _connString = connectionString;
    }

    ////////////////////
    // IDbConnection
    ////////////////////

    // Public Properties
    public string ConnectionString
    {
      get { return _connString;  }
      set { _connString = value; }
    }
    
    public int ConnectionTimeout
    {
      get 
      {
        throw new InvalidOperationException("XmlClient Provider does not support this function");
      }
    }
    public string Database 
    {
      get 
      {
        throw new InvalidOperationException("XmlClient Provider does not support this function");
      }
    }
    public ConnectionState State 
    {
      get { return _connState; }
    }

    // Public Methods
    public IDbTransaction BeginTransaction()
    {
      throw new InvalidOperationException("XmlClient Provider does not support this function");
    }

    public IDbTransaction BeginTransaction(IsolationLevel lvl)
    {
      throw new InvalidOperationException("XmlClient Provider does not support this function");
    }

    public void ChangeDatabase(string databaseName)
    {
      throw new InvalidOperationException("XmlClient Provider does not support this function");
    }

    public void Close()
    {
      _doc.RemoveAll();
      _connState = ConnectionState.Closed;
    }

    public IDbCommand CreateCommand()
    {
      return new XmlCommand("", this);
    }

    public void Open()
    {
      _doc.Load(_connString);
      _connState = ConnectionState.Open;
    }

    ////////////////////
    // ICloneable
    ////////////////////
    public object Clone()
    {
      return null;
    }

    ////////////////////
    // Internal Data Members
    ////////////////////
    internal ConnectionState  _connState = ConnectionState.Closed;
    internal string           _connString = "";
    internal XmlDocument      _doc = new XmlDocument();

  }
}

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