C# ListBox.Update方法代码示例

        /// <summary>
        /// Scans each of the communication ports listed in the registry to determine if it is connected to target hardware and generates a list
        /// of the target configuration information and the communication settings for each target that is located. 
        /// </summary>
        /// <param name="targetConfigurationList">The list containing the target configuration information for any targets connected to the PTU.</param>
        /// <param name="communicationSettingList">The communication settings associated with each target that was found.</param>
        /// <param name="listBoxTargetsFound">The <c>ListBox</c> control on which the target names are to be displayed.</param>
        /// <param name="statusInformation">The control on which the status information is to be displayed.</param>
        /// <returns>A flag to indicate whether one or more targets were found; true, if  targets were found, otherwise, false.</returns>
        public bool GetTargets(ListBox listBoxTargetsFound, Control statusInformation,  out List<TargetConfiguration_t> targetConfigurationList,
                               out List<CommunicationSetting_t> communicationSettingList)
        {
            // Instantiate to output parameters.
            communicationSettingList = new List<CommunicationSetting_t>();
            targetConfigurationList = new List<TargetConfiguration_t>();

            CommunicationApplication communicationInterface;

            // Flag to indicate whether target hardware was found; true, if one or more targets were found, otherwise, false.
            bool targetFound = false;

			if (Parameter.CommunicationType == Parameter.CommunicationTypeEnum.Both || Parameter.CommunicationType == Parameter.CommunicationTypeEnum.RS232)
			{

				// -----------------------------------------------------------------
				// Scan each serial communication (COM) port listed in the Registry.
				// -----------------------------------------------------------------

				// Get the list of available serial COM ports from the registry.
				RegistryKey root = Registry.LocalMachine;
				CommunicationSetting_t communicationSetting = new CommunicationSetting_t();

				// Set the protocol to serial communication.
				communicationSetting.Protocol = Protocol.RS232;

				// Initialize the serial communication parameters.
				communicationSetting.SerialCommunicationParameters.SetToDefault();

				TargetConfiguration_t targetConfiguration;
				using (RegistryKey serialCommunication = root.OpenSubKey(RegistryKeySerialCommunication))
				{
					// Scan each port in the Registry.
					foreach (string valueName in serialCommunication.GetValueNames())
					{
						// Filter out those '\HKEY_LOCAL_MACHINE\HARDWARE\DEVICEMAP\SERIALCOMM' keys that are not to be included in the search.
						switch (valueName)
						{
							// Skip those registry keys defined here.
							case SerialCommRegistryKeyWinachsf0:
								continue;
							default:
								// Process the key.
								break;
						}

						string value = serialCommunication.GetValue(valueName).ToString();

						communicationSetting.Port.Name = value;
						communicationSetting.Port.FullSpecification = value.PadRight(ComDeviceTotalCharacters) + " - " + valueName;
						communicationSetting.Port.Type = (communicationSetting.Port.FullSpecification.Contains(VirtualComPort)) ? PortType.VCP : PortType.COM;

						// Determine the port identifier, this is a 16 bit Unicode string representation of the serial port number e.g. for physical and virtual
                        // COM ports this takes the form: 1, 2, 3 ... etc.
						switch (communicationSetting.Port.Type)
						{
							case PortType.COM:
							case PortType.VCP:
								communicationSetting.PortIdentifier = communicationSetting.Port.Name.Remove(0, communicationSetting.Port.Type.ToString().Length);
								break;
							default:
								throw new ArgumentException("FormSelectTargetLogic.LocateTargetHardware()", "communicationSetting.Port.Type");
						}

						statusInformation.Text = Resources.TextSearchingForTargetOn + CommonConstants.Space + communicationSetting.Port.FullSpecification;
						statusInformation.Update();

						// Instantiate the appropriate type of communication interface.
						communicationInterface = new CommunicationApplication();
						try
						{
							if (communicationInterface.ScanPort(communicationSetting, out targetConfiguration) == true)
							{
								targetConfigurationList.Add(targetConfiguration);
                                listBoxTargetsFound.Items.Add(targetConfiguration.SubSystemName + " - (COM" + communicationSetting.PortIdentifier + ")" );
								listBoxTargetsFound.Update();
								statusInformation.Text = Resources.TextTargetFoundOn + CommonConstants.Space + communicationSetting.Port.FullSpecification;
                                statusInformation.Update();
								communicationSettingList.Add(communicationSetting);
								targetFound = true;
							}
						}
						catch (Exception)
						{
							statusInformation.Text = Resources.TextNoTargetFoundOn + CommonConstants.Space + communicationSetting.Port.FullSpecification;
							statusInformation.Update();
							continue;
						}
					}
				}
			}
//.........这里部分代码省略.........