1.在GeoDatabase中创建要素类,GeoDatabase包括Personal GeoDatabase(Microsoft Office Access数据库)和File GeoDatabase
(ESRI基于文件存放的空间数据库)。
1 ///<summary>Simple helper to create a featureclass in a geodatabase.在GeoDatabase中创建要素类</summary>
2 ///
3 ///<param name="workspace">An IWorkspace2 interface</param>
4 ///<param name="featureDataset">An IFeatureDataset interface or Nothing.要素集,在该要素集下面创建要素类,没有则在GeoDatabase根目录下面创建要素类</param>
5 ///<param name="featureClassName">A System.String that contains the name of the feature class to open or create. Example: "states"</param>
6 ///<param name="fields">An IFields interface.创建的要素类的字段</param>
7 ///<param name="CLSID">A UID value or Nothing. Example "esriGeoDatabase.Feature" or Nothing</param>
8 ///<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>
9 ///<param name="strConfigKeyword">An empty System.String or RDBMS table string for ArcSDE. Example: "myTable" or ""</param>
10 ///
11 ///<returns>An IFeatureClass interface or a Nothing</returns>
12 ///
13 ///<remarks>
14 /// (1) If a 'featureClassName' already exists in the workspace a reference to that feature class
15 /// object will be returned.
16 /// (2) If an IFeatureDataset is passed in for the 'featureDataset' argument the feature class
17 /// will be created in the dataset. If a Nothing is passed in for the 'featureDataset'
18 /// argument the feature class will be created in the workspace.
19 /// (3) When creating a feature class in a dataset the spatial reference is inherited
20 /// from the dataset object.
21 /// (4) If an IFields interface is supplied for the 'fields' collection it will be used to create the
22 /// table. If a Nothing value is supplied for the 'fields' collection, a table will be created using
23 /// default values in the method.
24 /// (5) The 'strConfigurationKeyword' parameter allows the application to control the physical layout
25 /// for this table in the underlying RDBMSfor example, in the case of an Oracle database, the
26 /// configuration keyword controls the tablespace in which the table is created, the initial and
27 /// next extents, and other properties. The 'strConfigurationKeywords' for an ArcSDE instance are
28 /// set up by the ArcSDE data administrator, the list of available keywords supported by a workspace
29 /// may be obtained using the IWorkspaceConfiguration interface. For more information on configuration
30 /// keywords, refer to the ArcSDE documentation. When not using an ArcSDE table use an empty
31 /// string (ex: "").
32 ///</remarks>
33 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)
34 {
35 if (featureClassName == "") return null; // name was not passed in
36
37 ESRI.ArcGIS.Geodatabase.IFeatureClass featureClass;
38 ESRI.ArcGIS.Geodatabase.IFeatureWorkspace featureWorkspace = (ESRI.ArcGIS.Geodatabase.IFeatureWorkspace)workspace; // Explicit Cast
39
40 if (workspace.get_NameExists(ESRI.ArcGIS.Geodatabase.esriDatasetType.esriDTFeatureClass, featureClassName)) //feature class with that name already exists
41 {
42 featureClass = featureWorkspace.OpenFeatureClass(featureClassName);
43 return featureClass;
44 }
45
46 // assign the class id value if not assigned
47 if (CLSID == null)
48 {
49 CLSID = new ESRI.ArcGIS.esriSystem.UIDClass();
50 CLSID.Value = "esriGeoDatabase.Feature";
51 }
52
53 ESRI.ArcGIS.Geodatabase.IObjectClassDescription objectClassDescription = new ESRI.ArcGIS.Geodatabase.FeatureClassDescriptionClass();
54
55 // if a fields collection is not passed in then supply our own
56 if (fields == null)
57 {
58 // create the fields using the required fields method
59 fields = objectClassDescription.RequiredFields;
60 ESRI.ArcGIS.Geodatabase.IFieldsEdit fieldsEdit = (ESRI.ArcGIS.Geodatabase.IFieldsEdit)fields; // Explicit Cast
61 ESRI.ArcGIS.Geodatabase.IField field = new ESRI.ArcGIS.Geodatabase.FieldClass();
62
63 // create a user defined text field
64 ESRI.ArcGIS.Geodatabase.IFieldEdit fieldEdit = (ESRI.ArcGIS.Geodatabase.IFieldEdit)field; // Explicit Cast
65
66 // setup field properties
67 fieldEdit.Name_2 = "SampleField";
68 fieldEdit.Type_2 = ESRI.ArcGIS.Geodatabase.esriFieldType.esriFieldTypeString;
69 fieldEdit.IsNullable_2 = true;
70 fieldEdit.AliasName_2 = "Sample Field Column";
71 fieldEdit.DefaultValue_2 = "test";
72 fieldEdit.Editable_2 = true;
73 fieldEdit.Length_2 = 100;
74
75 // add field to field collection
76 fieldsEdit.AddField(field);
77 fields = (ESRI.ArcGIS.Geodatabase.IFields)fieldsEdit; // Explicit Cast
78 }
79
80 System.String strShapeField = "";
81
82 // locate the shape field
83 for (int j = 0; j < fields.FieldCount; j++)
84 {
85 if (fields.get_Field(j).Type == ESRI.ArcGIS.Geodatabase.esriFieldType.esriFieldTypeGeometry)
86 {
87 strShapeField = fields.get_Field(j).Name;
88 }
89 }
90
91 // Use IFieldChecker to create a validated fields collection.
92 ESRI.ArcGIS.Geodatabase.IFieldChecker fieldChecker = new ESRI.ArcGIS.Geodatabase.FieldCheckerClass();
93 ESRI.ArcGIS.Geodatabase.IEnumFieldError enumFieldError = null;
94 ESRI.ArcGIS.Geodatabase.IFields validatedFields = null;
95 fieldChecker.ValidateWorkspace = (ESRI.ArcGIS.Geodatabase.IWorkspace)workspace;
96 fieldChecker.Validate(fields, out enumFieldError, out validatedFields);
97
98 // The enumFieldError enumerator can be inspected at this point to determine
99 // which fields were modified during validation.
100 // finally create and return the feature class
101 if (featureDataset == null)// if no feature dataset passed in, create at the workspace level
102 {
103 featureClass = featureWorkspace.CreateFeatureClass(featureClassName, validatedFields, CLSID, CLSEXT, ESRI.ArcGIS.Geodatabase.esriFeatureType.esriFTSimple, strShapeField, strConfigKeyword);
104 }
105 else
106 {
107 featureClass = featureDataset.CreateFeatureClass(featureClassName, validatedFields, CLSID, CLSEXT, ESRI.ArcGIS.Geodatabase.esriFeatureType.esriFTSimple, strShapeField, strConfigKeyword);
108 }
109 return featureClass;
110 }
源：http://help.arcgis.com/en/sdk/10.0/arcobjects_net/componenthelp/index.html#/Create_FeatureClass_Snippet/0049000000pz000000/