ArcGis featureLayer中添加字段

featureLayer中添加字段

这是我2010年11月份写的东东，现在拿出来给大家分享一下，这几个方法都是抽象出来的，可以拿过来直接使用。

说明一下：这些都是.net平台，VS2008+ArcGis9.3调试通过的

//检查fields是否有效

public IFields ValidateFieldsForWorkspace(IFields fields, IWorkspace workspace)
{
// Create a new field checker.
IFieldChecker fieldChecker = new FieldCheckerClass();
fieldChecker.ValidateWorkspace = workspace;

// Validate the fields.
IEnumFieldError enumFieldError = null;
IFields validatedFields = null;
fieldChecker.Validate(fields, out enumFieldError, out validatedFields);

// Display the field errors.
IFieldError fieldError = null;
enumFieldError.Reset();
while ((fieldError = enumFieldError.Next()) != null)
{
IField errorField = fields.get_Field(fieldError.FieldIndex);
Console.WriteLine("Field '{0}': Error '{1}'", errorField.Name,
fieldError.FieldError);
}

// Return the validated fields.
return validatedFields;
}





//为要素类创建fields



public IFields CreateFieldsCollectionForFeatureClass(ISpatialReference
spatialReference)
{
// Use the feature class description to return the required fields in a fields collection.
IFeatureClassDescription fcDesc = new FeatureClassDescriptionClass();
IObjectClassDescription cDesc = (IObjectClassDescription)fcDesc;

// Create the fields using the required fields method.
IFields fields = ocDesc.RequiredFields;

// Locate the shape field with the name from the feature class description.
int shapeFieldIndex = fields.FindField(fcDesc.ShapeFieldName);
IField shapeField = fields.get_Field(shapeFieldIndex);

// Modify the GeometryDef object before using the fields collection to create a new feature class.
IGeometryDef geometryDef = shapeField.GeometryDef;
IGeometryDefEdit geometryDefEdit = (IGeometryDefEdit)geometryDef;

// Alter the feature class geometry type to lines (default is polygons).
geometryDefEdit.GeometryType_2 = esriGeometryType.esriGeometryPolyline;
geometryDefEdit.HasM_2 = true;
geometryDefEdit.GridCount_2 = 1;

// Set the first grid size to zero and allow ArcGIS to determine a valid grid size.
geometryDefEdit.set_GridSize(0, 0);
geometryDefEdit.SpatialReference_2 = spatialReference;

// Because the fields collection already exists, the AddField method on the IFieldsEdit interface
// will be used to add a field that is not required to the fields collection.
IFieldsEdit fieldsEdit = (IFieldsEdit)fields;
IField incomeField = new FieldClass();
IFieldEdit incomeFieldEdit = (IFieldEdit)incomeField;

// Create a user-defined double field.
incomeFieldEdit.AliasName_2 = "Average income for 1999-2000";
incomeFieldEdit.Editable_2 = true;
incomeFieldEdit.IsNullable_2 = false;
incomeFieldEdit.Name_2 = "average_income";
incomeFieldEdit.Precision_2 = 2;
incomeFieldEdit.Scale_2 = 5;
incomeFieldEdit.Type_2 = esriFieldType.esriFieldTypeDouble;
fieldsEdit.AddField(incomeField);

return fields;
}





//为table创建fields



public IFields CreateFieldsCollectionForTable()
{
// Create a new fields collection.
IFields fields = new FieldsClass();

// Cast to IFieldsEdit to modify the properties of the fields collection.
IFieldsEdit fieldsEdit = (IFieldsEdit)fields;

// Set the number of fields the collection will contain.
fieldsEdit.FieldCount_2 = 2;

// Create the ObjectID field.
IField idField = new FieldClass();

// Cast to IFieldEdit to modify the properties of the new field.
IFieldEdit idFieldEdit = (IFieldEdit)oidField;
oidFieldEdit.Name_2 = "ObjectID";
oidFieldEdit.AliasName_2 = "FID";
oidFieldEdit.Type_2 = esriFieldType.esriFieldTypeOID;

// Add the new field to the fields collection.
fieldsEdit.set_Field(0, oidField);

// Create the text field.
IField textField = new FieldClass();
IFieldEdit textFieldEdit = (IFieldEdit)textField;
textFieldEdit.Length_2 = 30;
// Only string fields require that you set the length.
textFieldEdit.Name_2 = "Owner";
textFieldEdit.Type_2 = esriFieldType.esriFieldTypeString;

// Add the new field to the fields collection.
fieldsEdit.set_Field(1, textField);

return fields;
}






//向要素类添加fields字段


public void AddFieldToFeatureClass(IFeatureClass featureClass, IField field)
{
ISchemaLock schemaLock = (ISchemaLock)featureClass;

try
{
// A try block is necessary, as an exclusive lock may not be available.
schemaLock.ChangeSchemaLock(esriSchemaLock.esriExclusiveSchemaLock);

// Add the field.
featureClass.AddField(field);
}
catch (Exception exc)
{
// Handle this in a way appropriate to your application.
Console.WriteLine(exc.Message);
}
finally
{
// Set the lock to shared, whether or not an error occurred.
schemaLock.ChangeSchemaLock(esriSchemaLock.esriSharedSchemaLock);
}
}