Finding how many features inside drawn Polygon using ArcObjects?

Question

I have drawn a polygon. Using SpatialFilter I found and processed all the features in it. But I wanted to get the feature count before working with the features.

Is there any method that I can use to determine that the count of features in a drawn Polygon Geometry beforehand?

I have drawn a polygon. The intersecting features inside the Polygon. Also, I wanted myself to count of all the features inside that drawn boundary. For example, if 1 transmedia and 1 structure are there in the drawn boundary. I am supposed to have the feature count 2. I am anyhow getting the count at the time of processing. But I have to find the count before hand. Why I am doing it beforehand since I want to find what is the percentage of processing done at a certain time and display it in progress bar.

Here is a snippet.

while ((esriLayer = esriEnumLayer.Next()) != null)
 {
 if (esriLayer.Valid) // Checking if the layer is a valid layer
 {
 esriFeatureLayer = esriLayer as IFeatureLayer;
 IFeatureCursor esriFeatureCursor = esriFeatureLayer.FeatureClass.Search(spatialFilter, true);
 if (esriFeatureLayer.FeatureClass.ShapeType == esriGeometryType.esriGeometryPolygon)
 {
 continue;
 }
 while ((esriFeature = esriFeatureCursor.NextFeature()) != null)
 {
 int count = 0;
 totalNumberOfFeatures++;
 _progressStatus = 5;
 string message = "Validating " + esriFeature.Class.AliasName.ToString() + ":" + esriFeature.OID.ToString();
 ShowProgressBar(_progressStatus, message);
 lstFeature.Add(esriFeature.Class.AliasName.ToString());
 esriInvalidFeature = ReadConfigAndValidateFeature(esriFeature, message);
 _progressStatus = _progressStatus + 60;
 ShowProgressBar(_progressStatus, message);
 if ( esriInvalidFeature != null )
 {
 string Key = esriInvalidFeature.Class.AliasName.ToString() + ":" + esriInvalidFeature.OID.ToString();
 if (!diction.ContainsKey(Key))
 {
 diction.Add(Key, esriInvalidFeature);
 }
 else
 {
 continue;
 }
 }
 }
 }
 }

I am processing the features using the method # ReadConfigAndValidateFeature I am hardcoding the stuff for now. But I want to showcase the percentage.

Update : After seeing the useful hint I have written a full method to count the features. Here is the code #

private int FeatureCount(IMap mapInstance, ISpatialFilter spatialFilter)
 {
 int featureCount = 0;
 IEnumLayer esriEnumLayer = mapInstance.get_Layers(null, true);
 ILayer esriLayer = null;
 IFeatureLayer esriFeatureLayer = null;
 while ((esriLayer = esriEnumLayer.Next()) != null)
 {
 esriFeatureLayer = (IFeatureLayer) esriLayer;
 if (esriFeatureLayer.FeatureClass.ShapeType == 
 esriGeometryType.esriGeometryPolygon)
 {
 continue;
 }
 if (esriLayer.Valid) // Checking if the layer is a valid layer
 {
 if ( 
 esriFeatureLayer.FeatureClass.FeatureCount(spatialFilter) > 0)
 {
 featureCount += 
 esriFeatureLayer.FeatureClass.FeatureCount(spatialFilter);
 }
 }
 }
 return featureCount;
 }

• Shiuli Pervin: Do you want to count feature of another shapefile inside your drwan polygon? This part is not cleare.
• royan: Update: I am trying to clear things up. I have drawn a polygon. The intersecting features inside the Polygon I need. Also, I need the count of all the features inside that drawn boundary. For example, if 1 transmedia and 1 structure are there in the drawn boundary. I need to have the feature count 2. I am anyhow getting the count at the time of processing. But I need the count before hand. Why I need it beforehand since I need to find what is the percentage of processing done at a certain time and display it in progress bar.
• royan: I have updated the code even. I think now I can make it clear.
• Vince: Please Edit the question in response to requests for clarification. It's not fair to those who would answer to need to mine the comments for critical information.
• royan: Hello Vince, I am sorry for writing the word "need" . I tried to remove that. You are correct.

Answer 1

Use the IFeatureClass.FeatureCount() method. It's right here in the documentation.

• royan: Thanks Berend for Adding your valuable comments and showed me the path for solution. But for this I am not getting the feature count directly. I was thinking that there might be some ESRI spatial function to count the features as we do count(*) in a Oracle. But it is working with little time. I am updating with the full code after seeing your comment.