实例介绍
/* ======================================================================== * Copyright (c) 2005-2013 The OPC Foundation, Inc. All rights reserved. * * OPC Foundation MIT License 1.00 * * Permission is hereby granted, free of charge, to any person * obtaining a copy of this software and associated documentation * files (the "Software"), to deal in the Software without * restriction, including without limitation the rights to use, * copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following * conditions: * * The above copyright notice and this permission notice shall be * included in all copies or substantial portions of the Software. * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. * * The complete license agreement can be found here: * http://opcfoundation.org/License/MIT/1.00/ * ======================================================================*/ using System; using System.Collections.Generic; using System.ComponentModel; using System.Drawing; using System.Data; using System.Text; using System.Windows.Forms; using System.Reflection; using Opc.Ua.Configuration; namespace Opc.Ua.Client.Controls { /// <summary> /// Displays a drop down list of hosts. /// </summary> public partial class SelectHostCtrl : UserControl { #region Constructors /// <summary> /// Initializes the control. /// </summary> public SelectHostCtrl() { InitializeComponent(); } #endregion #region Private Fields private int m_selectedIndex; private bool m_selectDomains; private event EventHandler<SelectHostCtrlEventArgs> m_HostSelected; private event EventHandler<SelectHostCtrlEventArgs> m_HostConnected; #endregion #region Public Interface /// <summary> /// Whether the control is used to select domains instead of hosts. /// </summary> [System.ComponentModel.DefaultValue(false)] public bool SelectDomains { get { return m_selectDomains; } set { m_selectDomains = value; } } /// <summary> /// The text displayed on the connect button. /// </summary> [System.ComponentModel.DefaultValue("Connect")] public string CommandText { get { return ConnectBTN.Text; } set { ConnectBTN.Text = value; } } /// <summary> /// Displays a set of hostnames in the control. /// </summary> public void Initialize(string defaultHost, IList<string> hostnames) { HostsCB.Items.Clear(); // add option to browse for hosts. HostsCB.Items.Add("<Browse...>"); // add any existing hosts. if (hostnames != null) { foreach (string hostname in hostnames) { HostsCB.Items.Add(hostname); } } // set a suitable default hostname. if (String.IsNullOrEmpty(defaultHost)) { defaultHost = System.Net.Dns.GetHostName(); if (hostnames != null && hostnames.Count > 0) { defaultHost = hostnames[0]; } } // set the current selection. m_selectedIndex = HostsCB.FindString(defaultHost); if (m_selectedIndex == -1) { m_selectedIndex = HostsCB.Items.Add(defaultHost); } HostsCB.SelectedIndex = m_selectedIndex; } /// <summary> /// Raised when a host is selected in the control. /// </summary> public event EventHandler<SelectHostCtrlEventArgs> HostSelected { add { m_HostSelected = value; } remove { m_HostSelected -= value; } } /// <summary> /// Raised when the connect button is clicked. /// </summary> public event EventHandler<SelectHostCtrlEventArgs> HostConnected { add { m_HostConnected = value; } remove { m_HostConnected -= value; } } #endregion #region Event Handlers private void HostsCB_SelectedIndexChanged(object sender, EventArgs e) { try { if (HostsCB.SelectedIndex != 0) { if (m_HostSelected != null) { m_HostSelected(this, new SelectHostCtrlEventArgs((string)HostsCB.SelectedItem)); } m_selectedIndex = HostsCB.SelectedIndex; return; } if (!m_selectDomains) { // prompt user to select a host. string hostname = new HostListDlg().ShowDialog(null); if (hostname == null) { HostsCB.SelectedIndex = m_selectedIndex; return; } // set the current selection. m_selectedIndex = HostsCB.FindString(hostname); if (m_selectedIndex == -1) { m_selectedIndex = HostsCB.Items.Add(hostname); } } HostsCB.SelectedIndex = m_selectedIndex; } catch (Exception exception) { GuiUtils.HandleException(this.Text, MethodBase.GetCurrentMethod(), exception); } } private void ConnectBTN_Click(object sender, EventArgs e) { try { int index = HostsCB.SelectedIndex; if (index == 0) { return; } if (m_HostConnected != null) { if (index == -1) { if (!String.IsNullOrEmpty(HostsCB.Text)) { m_HostConnected(this, new SelectHostCtrlEventArgs(HostsCB.Text)); } // add host to list. m_selectedIndex = HostsCB.FindString(HostsCB.Text); if (m_selectedIndex == -1) { m_selectedIndex = HostsCB.Items.Add(HostsCB.Text); } return; } m_HostConnected(this, new SelectHostCtrlEventArgs((string)HostsCB.SelectedItem)); } } catch (Exception exception) { GuiUtils.HandleException(this.Text, MethodBase.GetCurrentMethod(), exception); } } #endregion } #region SelectHostCtrlEventArgs Class /// <summary> /// The event arguments passed when the SelectHostCtrlEventArgs raises events. /// </summary> public class SelectHostCtrlEventArgs : EventArgs { /// <summary> /// Initilizes the object with the current hostname. /// </summary> public SelectHostCtrlEventArgs(string hostname) { m_hostname = hostname; } /// <summary> /// The current hostname. /// </summary> public string Hostname { get { return m_hostname; } } private string m_hostname; } #endregion }
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