LogConverter.cs source code in C# .NET

Source code for the .NET framework in C#

                        
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 { 
        /// 
        ///  
        ///    
        ///       Provides a  that specifies the
        ///       possible values for the enumeration.
        ///     
        /// 
        private StandardValuesCollection values; 
        private string oldMachineName; 

        ///  
        /// 
        ///    
        ///       Initializes a new instance of the LogConverter class for the given
        ///       type. 
        ///    
        ///  
        public LogConverter() { 
        }
 
        /// 
        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); 
        } 

        ///  
        /// 
        /// 
        ///    Gets a collection of standard values for the data type this validator is
        ///       designed for. 
        /// 
        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 value indicating
        ///       whether this object 
        ///       supports a standard set of values that can be picked 
        ///       from a list using the specified context.
        ///  
        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.

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