Different between IField and IFields

JustinZHOU — Tue, 21 Aug 2018 07:26:29 GMT

As a beginner, I am just so confused with IField, IFieldEdit, IFields, IFieldsEdit.

Grateful that someone can help this so I can understand it in a logical way.

Sub Question 1: What are the relations among them? And what can be the easier way to understand their purpose after their instance creation?

Sub Question 2: How to understand the following coding?

// I guess both pFields and pField use FieldsClass() to create an instance

IFields pFields = new FieldsClass();

IField pField = new FieldClass();

// Can I comprehend in this way that pFieldsEdit and pFieldEdit are created to "inherit" members and methods of pFields and pField, respectively?

IFieldsEdit pFieldsEdit = (IFieldsEdit)pFields;
IFieldEdit pFieldEdit = (IFieldEdit)pField;

// Some value assignment on pFieldEdit

pFieldEdit.Name_2 = "Shape";
pFieldEdit.Type_2 = esriFieldType.esriFieldTypeGeometry;

// .... some code here ....code related to IField or IFields are shown here....

pFieldEdit.GeometryDef_2 = pGeometryDef;

// The above code shows nothing to do with pField, but what happened to pField after operations on pFieldEdit ?
pFieldsEdit.AddField(pField);

IFeatureClass pFeatureClass;
pFeatureClass = pFWS.CreateFeatureClass(shapeName, pFields, null, null, esriFeatureType.esriFTSimple, "Shape", "");

Re: Different between IField and IFields

nicogis — Tue, 21 Aug 2018 09:03:02 GMT

In general for understand the relation among them you can see Reading OMDs

You can access OMDs from the Help system's table of contents (TOC) by clicking the Namespace reference node, expanding the node for the applicable assembly, expanding the node for the proper namespace named node, then clicking the applicable <Namespace> Object Model Diagram node

for example for geodatabase : GeoDatabaseObjectModel

topic Re: Different between IField and IFields in ArcObjects SDK Questions

Different between IField and IFields

Re: Different between IField and IFields