///<summary>Simple helper to create a featureclass in a geodatabase.</summary>/// ///<param name="workspace">An IWorkspace2 interface</param>///<param name="featureDataset">An IFeatureDataset interface or Nothing</param>///<param name="featureClassName">A System.String that contains the name of the feature class to open or create. Example: "states"</param>///<param name="fields">An IFields interface</param>///<param name="CLSID">A UID value or Nothing. Example "esriGeoDatabase.Feature" or Nothing</param>///<param name="CLSEXT">A UID value or Nothing (this is the class extension if you want to reference a class extension when creating the feature class).</param>///<param name="strConfigKeyword">An empty System.String or RDBMS table string for ArcSDE. Example: "myTable" or ""</param>///  ///<returns>An IFeatureClass interface or a Nothing</returns>///  ///<remarks>///  (1) If a ‘featureClassName‘ already exists in the workspace a reference to that feature class ///      object will be returned.///  (2) If an IFeatureDataset is passed in for the ‘featureDataset‘ argument the feature class///      will be created in the dataset. If a Nothing is passed in for the ‘featureDataset‘///      argument the feature class will be created in the workspace.///  (3) When creating a feature class in a dataset the spatial reference is inherited ///      from the dataset object.///  (4) If an IFields interface is supplied for the ‘fields‘ collection it will be used to create the///      table. If a Nothing value is supplied for the ‘fields‘ collection, a table will be created using ///      default values in the method.///  (5) The ‘strConfigurationKeyword‘ parameter allows the application to control the physical layout ///      for this table in the underlying RDBMSfor example, in the case of an Oracle database, the ///      configuration keyword controls the tablespace in which the table is created, the initial and ///     next extents, and other properties. The ‘strConfigurationKeywords‘ for an ArcSDE instance are ///      set up by the ArcSDE data administrator, the list of available keywords supported by a workspace ///      may be obtained using the IWorkspaceConfiguration interface. For more information on configuration ///      keywords, refer to the ArcSDE documentation. When not using an ArcSDE table use an empty ///      string (ex: "").///</remarks>public ESRI.ArcGIS.Geodatabase.IFeatureClass CreateFeatureClass(ESRI.ArcGIS.Geodatabase.IWorkspace2 workspace, ESRI.ArcGIS.Geodatabase.IFeatureDataset featureDataset, System.String featureClassName, ESRI.ArcGIS.Geodatabase.IFields fields, ESRI.ArcGIS.esriSystem.UID CLSID, ESRI.ArcGIS.esriSystem.UID CLSEXT, System.String strConfigKeyword){  if (featureClassName == "") return null; // name was not passed in   ESRI.ArcGIS.Geodatabase.IFeatureClass featureClass;  ESRI.ArcGIS.Geodatabase.IFeatureWorkspace featureWorkspace = (ESRI.ArcGIS.Geodatabase.IFeatureWorkspace)workspace; // Explicit Cast  if (workspace.get_NameExists(ESRI.ArcGIS.Geodatabase.esriDatasetType.esriDTFeatureClass, featureClassName)) //feature class with that name already exists   {    featureClass = featureWorkspace.OpenFeatureClass(featureClassName);    return featureClass;  }  // assign the class id value if not assigned  if (CLSID == null)  {    CLSID = new ESRI.ArcGIS.esriSystem.UIDClass();    CLSID.Value = "http://www.mamicode.com/esriGeoDatabase.Feature";  }  ESRI.ArcGIS.Geodatabase.IObjectClassDescription objectClassDescription = new ESRI.ArcGIS.Geodatabase.FeatureClassDescriptionClass();  // if a fields collection is not passed in then supply our own  if (fields == null)  {    // create the fields using the required fields method    fields = objectClassDescription.RequiredFields;    ESRI.ArcGIS.Geodatabase.IFieldsEdit fieldsEdit = (ESRI.ArcGIS.Geodatabase.IFieldsEdit)fields; // Explicit Cast    ESRI.ArcGIS.Geodatabase.IField field = new ESRI.ArcGIS.Geodatabase.FieldClass();    // create a user defined text field    ESRI.ArcGIS.Geodatabase.IFieldEdit fieldEdit = (ESRI.ArcGIS.Geodatabase.IFieldEdit)field; // Explicit Cast    // setup field properties    fieldEdit.Name_2 = "SampleField";    fieldEdit.Type_2 = ESRI.ArcGIS.Geodatabase.esriFieldType.esriFieldTypeString;    fieldEdit.IsNullable_2 = true;    fieldEdit.AliasName_2 = "Sample Field Column";    fieldEdit.DefaultValue_2 = "test";    fieldEdit.Editable_2 = true;    fieldEdit.Length_2 = 100;    // add field to field collection    fieldsEdit.AddField(field);    fields = (ESRI.ArcGIS.Geodatabase.IFields)fieldsEdit; // Explicit Cast  }  System.String strShapeField = "";  // locate the shape field  for (int j = 0; j < fields.FieldCount; j++)  {    if (fields.get_Field(j).Type == ESRI.ArcGIS.Geodatabase.esriFieldType.esriFieldTypeGeometry)    {      strShapeField = fields.get_Field(j).Name;    }  }  // Use IFieldChecker to create a validated fields collection.  ESRI.ArcGIS.Geodatabase.IFieldChecker fieldChecker = new ESRI.ArcGIS.Geodatabase.FieldCheckerClass();  ESRI.ArcGIS.Geodatabase.IEnumFieldError enumFieldError = null;  ESRI.ArcGIS.Geodatabase.IFields validatedFields = null;  fieldChecker.ValidateWorkspace = (ESRI.ArcGIS.Geodatabase.IWorkspace)workspace;  fieldChecker.Validate(fields, out enumFieldError, out validatedFields);  // The enumFieldError enumerator can be inspected at this point to determine   // which fields were modified during validation.  // finally create and return the feature class  if (featureDataset == null)// if no feature dataset passed in, create at the workspace level  {      featureClass = featureWorkspace.CreateFeatureClass(featureClassName, validatedFields, CLSID, CLSEXT, ESRI.ArcGIS.Geodatabase.esriFeatureType.esriFTSimple, strShapeField, strConfigKeyword);  }  else  {      featureClass = featureDataset.CreateFeatureClass(featureClassName, validatedFields, CLSID, CLSEXT, ESRI.ArcGIS.Geodatabase.esriFeatureType.esriFTSimple, strShapeField, strConfigKeyword);  }  return featureClass;}

源：http://help.arcgis.com/en/sdk/10.0/arcobjects_net/componenthelp/index.html#/Create_FeatureClass_Snippet/0049000000pz000000/

创建FeatureClass