创建FeatureClass

Posted 2020-08-06

///<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 = "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/