Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Designer / Monitoring / System / Diagnostics / Design / LogConverter.cs / 1 / LogConverter.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- /* */ namespace System.Diagnostics.Design { using System.Runtime.Serialization.Formatters; using System.ComponentModel; using System.Diagnostics; using System; using System.Collections; using System.Windows.Forms; using Microsoft.Win32; using System.ComponentModel.Design; using System.Globalization; ////// /// LogConverter is the TypeConverter for the Log property on EventLog. It returns /// a list of all event logs on the system. /// [System.Security.Permissions.SecurityPermission(System.Security.Permissions.SecurityAction.Demand, Flags=System.Security.Permissions.SecurityPermissionFlag.UnmanagedCode)] public class LogConverter : TypeConverter { ////// /// private StandardValuesCollection values; private string oldMachineName; ////// Provides a ///that specifies the /// possible values for the enumeration. /// /// /// public LogConverter() { } ////// Initializes a new instance of the LogConverter class for the given /// type. /// ///public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType) { if (sourceType == typeof(string)) { return true; } return base.CanConvertFrom(context, sourceType); } /// public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value) { if (value is string) { string text = ((string)value).Trim(); return text; } return base.ConvertFrom(context, culture, value); } /// /// /// /// public override StandardValuesCollection GetStandardValues(ITypeDescriptorContext context) { EventLog component = (context == null) ? null : context.Instance as EventLog; string machineName = "."; if (component != null) machineName = component.MachineName; if (values == null || machineName != oldMachineName) { try { EventLog[] eventLogs = EventLog.GetEventLogs(machineName); object[] names = new object[eventLogs.Length]; for (int i = 0; i < names.Length; i++) names[i] = eventLogs[i].Log; values = new StandardValuesCollection(names); oldMachineName = machineName; } catch(Exception) { //Do Nothing } } return values; } ///Gets a collection of standard values for the data type this validator is /// designed for. ////// /// /// public override bool GetStandardValuesSupported(ITypeDescriptorContext context) { return true; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.Gets a value indicating /// whether this object /// supports a standard set of values that can be picked /// from a list using the specified context. ///
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