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WqlEventQuery.HavingCondition Property

Gets or sets the condition to be applied to the aggregation of events, based on the number of events received.

Namespace:  System.Management
Assembly:  System.Management (in System.Management.dll)

public string HavingCondition { get; set; }

Property Value

Type: System.String
Returns a String value containing the condition applied to the aggregation of events, based on the number of events received.

Setting this property value overrides any previous value stored in the object. The query string is rebuilt to reflect the new grouping condition.

Property Value

Null, if no aggregation or no condition should be applied; otherwise, a condition of the form "NumberOfEvents <operator> <value>".

.NET Framework Security

Full trust for the immediate caller. This member cannot be used by partially trusted code. For more information, see Using Libraries from Partially Trusted Code.

The following example initializes a new WqlEventQuery and displays the event query string.

using System;
using System.Management;

public class EventSample 
{
    public static void Main(string[] args) 
    {
        WqlEventQuery query = new WqlEventQuery();
        query.EventClassName = "__InstanceCreationEvent";
        query.Condition = "TargetInstance ISA 'Win32_NTLogEvent'";
        query.GroupWithinInterval = new TimeSpan(0, 0, 10);
        System.Collections.Specialized.StringCollection collection =
            new System.Collections.Specialized.StringCollection();
        collection.Add("TargetInstance.SourceName");
        query.GroupByPropertyList = collection;
        query.HavingCondition = "NumberOfEvents > 25";

        Console.WriteLine(query.QueryString);
        return;
    }
}

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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