ESRI.ArcGIS.ADF.IMS
QueryParameters Class
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ESRI.ArcGIS.ADF.IMS.Carto.Layer Namespace : QueryParameters Class




Parameters used for Querying on a FeatureLayer.

Object Model

QueryParameters Class

Syntax

Visual Basic (Declaration) 
<SerializableAttribute()>
Public Class QueryParameters
Visual Basic (Usage)Copy Code
Dim instance As QueryParameters
C# 
[SerializableAttribute()]
public class QueryParameters

Example

For an example of using QueryParameters to select features without buffering, see FeatureLayer.Query . For an example of using QueryParameters with buffering to a target layer, see SelectionBuffer.

The following example sets many of the properties for a new QueryParameters object.

C#Copy Code
ESRI.ArcGIS.ADF.IMS.Carto.Layer.Filter queryFilter =
    new ESRI.ArcGIS.ADF.IMS.Carto.Layer.Filter("NAME = 'Mekong'");
 
ESRI.ArcGIS.ADF.IMS.Carto.Layer.QueryParameters qParams;
qParams = new ESRI.ArcGIS.ADF.IMS.Carto.Layer.QueryParameters(queryFilter);
 
qParams.EscapeResults = true;
qParams.FeatureLimit = 100;
qParams.OutputSpatialReference = 
    new ESRI.ArcGIS.ADF.IMS.SpatialReference.SpatialReference(26911);
qParams.ReturnEnvelopes = false;
qParams.ReturnGeometries = true;
qParams.ReturnGlobalEnvelope = true;
Visual BasicCopy Code
Dim queryFilter As New _
    ESRI.ArcGIS.ADF.IMS.Carto.Layer.Filter("NAME = 'Mekong'")
 
Dim qParams As New _
    ESRI.ArcGIS.ADF.IMS.Carto.Layer.QueryParameters(queryFilter)
 
qParams.EscapeResults = True
qParams.FeatureLimit = 100
qParams.OutputSpatialReference = _
    New ESRI.ArcGIS.ADF.IMS.SpatialReference.SpatialReference(26911)
qParams.ReturnEnvelopes = False
qParams.ReturnGeometries = True
qParams.ReturnGlobalEnvelope = True

Remarks

QueryParameters is used to find features in a feature layer by calling the Query method in the FeatureLayer. The query must include a valid QueryFilter, which specifies the attribute or spatial parameters of the query.

The query may also select features within a specified distance of another set of features in the same or different layer. For details, see SelectionBuffer.

Other properties of QueryParameters determine what information is returned with the query results: feature envelopes (ReturnEnvelopes), feature geometry (ReturnGeometries), and the envelope of all selected features (ReturnGlobalEnvelope). FeatureLimit limits the number of features returned in a given query operation. EscapeResults enables escaping of returned data. And OutputSpatialReference sets the projection and datum of the returned data.

Requirements

Target Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family, Windows Vista, Windows Server 2008 family

See Also

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