转自原文
控制台应用程序相比其他应用程序，更加简单，简化了许多冗余，可以让我们更加关注于本质的东西。
现在让我们看一看ArcGIS Engine的控制台应用程序吧！一、首先是许可绑定：
1、运行时环境的绑定ESRI.ArcGIS.RuntimeManager.Bind(ESRI.ArcGIS.ProductCode.EngineOrDesktop);
2、AO的许可级别
IAoInitialize aoInitialize = new AoInitializeClass(); esriLicenseStatus licenseStatus = aoInitialize.Initialize(esriLicenseProductCode.esriLicenseProductCodeStandard); if (licenseStatus != esriLicenseStatus.esriLicenseCheckedOut) { Console.WriteLine("Unable to check-out an ArcInfo license, error code is {0}", licenseStatus); return; }
二、接下来就可以写我们的程序啦。
using System; using System.IO; using System.Runtime.InteropServices; using ESRI.ArcGIS.ADF; using ESRI.ArcGIS.DataSourcesGDB; using ESRI.ArcGIS.esriSystem; using ESRI.ArcGIS.Geodatabase; using ESRI.ArcGIS.Geometry; namespace CursorDemo { public class CursorDemo { public static void Main(string[] args) { #region Licensing ESRI.ArcGIS.RuntimeManager.Bind(ESRI.ArcGIS.ProductCode.EngineOrDesktop); // Set up the licencing. NOTE: This sample assumes that you are using ArcInfo Desktop. // You will need to adjust this code if using ArcEngine or ArcEditor. IAoInitialize aoInitialize = new AoInitializeClass(); esriLicenseStatus licenseStatus = aoInitialize.Initialize(esriLicenseProductCode.esriLicenseProductCodeStandard); if (licenseStatus != esriLicenseStatus.esriLicenseCheckedOut) { Console.WriteLine("Unable to check-out an ArcInfo license, error code is {0}", licenseStatus); return; } #endregion // If test data exists from a previous run, delete it. if (Directory.Exists("CursorDemo.gdb")) { Directory.Delete("CursorDemo.gdb", true); } // Copy the test data from this section's Data directory. Type factoryType = Type.GetTypeFromProgID("esriDataSourcesGDB.FileGDBWorkspaceFactory"); IWorkspaceFactory workspaceFactory = (IWorkspaceFactory)Activator.CreateInstance(factoryType); IWorkspaceName sourceWorkspaceName = new WorkspaceNameClass { PathName = @"..\..\..\Data\CursorDemo.gdb", WorkspaceFactoryProgID = "esriDataSourcesGDB.FileGDBWorkspaceFactory" }; IWorkspaceName copiedWorkspaceName = null; workspaceFactory.Copy(sourceWorkspaceName, Environment.CurrentDirectory, out copiedWorkspaceName); // Open the copied data. IName copiedName = (IName)copiedWorkspaceName; IWorkspace workspace = (IWorkspace)copiedName.Open(); IFeatureWorkspace featureWorkspace = (IFeatureWorkspace)workspace; // Open the two feature classes used in this demo. IFeatureClass parcelsFeatureClass = featureWorkspace.OpenFeatureClass("Parcels"); IFeatureClass pipesFeatureClass = featureWorkspace.OpenFeatureClass("Pipes"); // The first demo, SearchCursorDemo, will display the Parcel IDs of all residential // parcels within a certain extent. SearchCursorDemo(parcelsFeatureClass); // The second demo, UpdateCursorDemo, will change the all parcels zoned as "Manufacturing" // to "Commercial". UpdateCursorDemo(workspace, parcelsFeatureClass); // The third demo, InsertCursorDemo, will create one hundred new pipe features using // an insert cursor. InsertCursorDemo(workspace, pipesFeatureClass); // Shutdown the licensing. aoInitialize.Shutdown(); } /// /// This sample queries a feature class of parcels, finding the Parcel IDs of all residential /// features that are within a given extent. /// /// The feature class to query. private static void SearchCursorDemo(IFeatureClass featureClass) { // Create an envelope that will define the spatial extent of the query. IEnvelope envelope = new EnvelopeClass(); envelope.PutCoords(506000, 684500, 506500, 685000); // Create a new spatial filter. ISpatialFilter spatialFilter = new SpatialFilterClass { Geometry = envelope, GeometryField = featureClass.ShapeFieldName, SpatialRel = esriSpatialRelEnum.esriSpatialRelIntersects, SubFields = "Parcel_ID", WhereClause = "ZONING_S = 'R'" }; // Find the index of the Parcel_ID field. This is required to display the query results. int parcelIdIndex = featureClass.FindField("Parcel_ID"); using (ComReleaser comReleaser = new ComReleaser()) { // Query the feature class to get a feature cursor. We can use a recycling // cursor because we're only going to be reading the data. IFeatureCursor featureCursor = featureClass.Search(spatialFilter, true); comReleaser.ManageLifetime(featureCursor); // Iterate through the query results. IFeature feature = null; while ((feature = featureCursor.NextFeature()) != null) { // Display the current feature's Parcel ID. Console.WriteLine("Parcel found: {0}", feature.get_Value(parcelIdIndex)); } // Display the number of feature matching the query. Console.WriteLine("Parcels found: {0}", featureClass.FeatureCount(spatialFilter)); } } /// /// This sample re-zones all "Manufacturing" parcels as "Commercial". /// /// The workspace containing the feature class. /// The feature class to update. private static void UpdateCursorDemo(IWorkspace workspace, IFeatureClass featureClass) { // Create a new query filter for the update. IQueryFilter queryFilter = new QueryFilterClass { WhereClause = "ZONING_S = 'M'" }; // Display the feature's zoned as Manufacturing. Console.WriteLine("Parcel found zoned as Manufacturing: {0}", featureClass.FeatureCount(queryFilter)); // Find the index of the Zoning_S field. This is required for the update. int zoningIndex = featureClass.FindField("ZONING_S"); // Start a new edit session and edit operation. IWorkspaceEdit workspaceEdit = (IWorkspaceEdit)workspace; workspaceEdit.StartEditing(true); workspaceEdit.StartEditOperation(); using (ComReleaser comReleaser = new ComReleaser()) { // Query the feature class to get a feature cursor. Since we are performing // updates, we should use a non-recycling cursor. IFeatureCursor featureCursor = featureClass.Update(queryFilter, false); comReleaser.ManageLifetime(featureCursor); try { // Iterate through the query results. IFeature feature = null; while ((feature = featureCursor.NextFeature()) != null) { // Change the feature's ZONING_S value to "B" (the code for Business/Commercial). feature.set_Value(zoningIndex, "B"); // Update the feature. featureCursor.UpdateFeature(feature); } // All of the features were successfully updated; stop the edit operation // and stop the edit session, saving the changes made in edit operations. workspaceEdit.StopEditOperation(); workspaceEdit.StopEditing(true); } catch (COMException) { // An error occurred while editing. Abort the edit operation and stop the // edit session, discarding any changes made in edit operations. workspaceEdit.AbortEditOperation(); workspaceEdit.StopEditing(false); } // Display the feature's zoned as Manufacturing after update. Console.WriteLine("Parcel found zoned as Manufacturing after update: {0}", featureClass.FeatureCount(queryFilter)); } } /// /// This sample uses an insert cursor to create one hundred new pipe features. /// /// The workspace containing the feature class. /// The feature class to insert new features into. private static void InsertCursorDemo(IWorkspace workspace, IFeatureClass featureClass) { // Find the index of the "Contractor" field. This will be edited in the new features. int contractorIndex = featureClass.FindField("CONTRACTOR"); // Put the feature class into "load-only" mode. In a File GDB, this will disable spatial // and attribute indexing, improving performance for data loading. IFeatureClassLoad featureClassLoad = (IFeatureClassLoad)featureClass; featureClassLoad.LoadOnlyMode = true; // Start an edit session and edit operation. IWorkspaceEdit workspaceEdit = (IWorkspaceEdit)workspace; workspaceEdit.StartEditing(true); workspaceEdit.StartEditOperation(); // Open the two text files containing the contractor's data. using (StreamReader geometryReader = new StreamReader(@"PipeGeo.csv")) using (StreamReader attributeReader = new StreamReader(@"PipeAttr.csv")) using (ComReleaser comReleaser = new ComReleaser()) { // Create a new insert cursor with buffering. IFeatureCursor featureCursor = featureClass.Insert(true); comReleaser.ManageLifetime(featureCursor); // Create a feature buffer. This will store the values common to every // feature to be installed. IFeatureBuffer featureBuffer = featureClass.CreateFeatureBuffer(); comReleaser.ManageLifetime(featureBuffer); featureBuffer.set_Value(contractorIndex, "B Pierce"); try { while (!geometryReader.EndOfStream && !attributeReader.EndOfStream) { // Read the next line from each text file. String geometryData = geometryReader.ReadLine(); String attributeData = attributeReader.ReadLine(); // Set the geometry and attribute values of the feature buffer. featureBuffer.Shape = ConstructGeometryFromString(geometryData); PopulateAttributeValues(featureBuffer, attributeData); // Insert a new feature using the feature buffer. featureCursor.InsertFeature(featureBuffer); } // Flush the cursor. featureCursor.Flush(); // All of the features were successfully inserted; stop the edit operation // and stop the edit session, saving the changes made in edit operations. workspaceEdit.StopEditOperation(); workspaceEdit.StopEditing(true); } catch (COMException) { // An error occurred while editing. Abort the edit operation and stop the // edit session, discarding any changes made in edit operations. workspaceEdit.AbortEditOperation(); workspaceEdit.StopEditing(false); } } // Take the class out of load-only mode. featureClassLoad.LoadOnlyMode = false; } /// /// This method converts a comma-delimited set of numeric values into a polyline. /// /// A string of comma-delimited numeric values. /// A polyline. private static IGeometry ConstructGeometryFromString(String input) { // Split the input string into individual values. String[] inputValues = input.Split(new char[] { ',' }); // Create a new polyline. IPolyline polyline = new PolylineClass(); IGeometryCollection geometryCollection = (IGeometryCollection)polyline; // Each set of four values represents one segment of a polyline. int segmentCount = inputValues.Length / 4; int inputValuePosition = 0; for (int i = 0; i < segmentCount; i++) { // This value is required for geometry construction. object missingType = Type.Missing; // Construct the segment. IPoint fromPoint = new PointClass { X = Double.Parse(inputValues[inputValuePosition++]), Y = Double.Parse(inputValues[inputValuePosition++]) }; IPoint toPoint = new PointClass { X = Double.Parse(inputValues[inputValuePosition++]), Y = Double.Parse(inputValues[inputValuePosition++]) }; IPath path = new PathClass(); IPointCollection pointCollection = (IPointCollection)path; pointCollection.AddPoint(fromPoint, ref missingType, ref missingType); pointCollection.AddPoint(toPoint, ref missingType, ref missingType); // Add the segment to the collection. geometryCollection.AddGeometry(path, ref missingType, ref missingType); } // Return the constructed polyline. return polyline; } /// /// Populates the inbound feature buffer with the comma-delimited values /// in the input string. /// /// The feature buffer to populate. /// A string containing attribute values. private static void PopulateAttributeValues(IFeatureBuffer featureBuffer, String input) { // Split the input string into individual values. String[] inputValues = input.Split(new char[] { ',' }); // Set the values of the Date_Installed, material and diameter fields. // For the sake of simplicity, we'll hard-code the values here. featureBuffer.set_Value(2, inputValues[0]); featureBuffer.set_Value(4, inputValues[1]); featureBuffer.set_Value(5, inputValues[2]); } } }