Programmatically get a count of features in a layer

Summary

This article shows how to use IFeatureClass::FeatureCount to return a count of features in the layer or the number of features that satisfy a query.

Procedure

• Use Nothing in place of the Query Filter argument to return a count of all the features.
  
  

  Code:
  Sub FeatureCount()
  Dim pDoc As IMxDocument
  Set pDoc = ThisDocument
  
  'Get the first layer in the map
  Dim pLayer As IFeatureLayer
  Set pLayer = pDoc.FocusMap.Layer(0)
  Dim pFc As IFeatureClass
  Set pFc = pLayer.FeatureClass
  
  'Get a count of all the features
  MsgBox pFc.FeatureCount(Nothing)
  
  End Sub

  
  
• Use a Query Filter to return the features that satisfy the where clause.
  
  

  Code:
  Sub FeatureCount()
  Dim pDoc As IMxDocument
  Set pDoc = ThisDocument
  
  'Get the first layer in the map
  Dim pLayer As IFeatureLayer
  Set pLayer = pDoc.FocusMap.Layer(0)
  Dim pFc As IFeatureClass
  Set pFc = pLayer.FeatureClass
  
  'Create a Query Filter
  Dim pQF As IQueryFilter
  Set pQF = New QueryFilter
  pQF.WhereClause = "STATE_NAME = 'California'"
  
  'Get a count of all the features
  MsgBox pFc.FeatureCount(pQF)
  
  End Sub