IPoilygon转IPoint

 1  private void 河流面转点ToolStripMenuItem_Click(object sender, EventArgs e)
 2         {
 3             ESRI.ArcGIS.Geodatabase.IWorkspaceFactory wsf = new ESRI.ArcGIS.DataSourcesFile.ShapefileWorkspaceFactory();
 4             IWorkspace ws = wsf.OpenFromFile(@"F:1-水利项目安徽水利826处理", 0);
 5 
 6             IFeatureClass autoStation = (ws as IFeatureWorkspace).OpenFeatureClass("淮河干流面");
 7             IFeatureClass f1 = (ws as IFeatureWorkspace).OpenFeatureClass("河道范围点");
 8 
 9             int num = autoStation.FeatureCount(null);            
10             int k = 0;
11             string file = @"F:1-水利项目安徽水利ANSL20120808ANSLOutPut淮河干流hedaopolygon.txt";
12             if (File.Exists(file))
13             {
14                 File.Delete(file);
15             }
16             StreamWriter writer = new StreamWriter(file, true);
17             string strpt = "";
18             for (int i = 0; i < num; i++) 
19             {
20                 IPolygon pg = autoStation.GetFeature(i).Shape as IPolygon;
21                                   
22                 IPointCollection ptc = pg as IPointCollection;
23                 for (int j = 0; j < ptc.PointCount; j++)
24                 {
25                     IPoint pt = ptc.get_Point(j);
26                     k++;
27                     IFeature fea = f1.CreateFeature();
28                     fea.Shape = pt;
29                     fea.set_Value(fea.Fields.FindField("Id"), k);
30                     fea.set_Value(fea.Fields.FindField("longi"), pt.X);
31                     fea.set_Value(fea.Fields.FindField("latit"), pt.Y);
32                     fea.Store();
33 
34                     strpt=strpt+pt.X+","+pt.Y+","+"0,";
35                 }
36                 strpt = strpt + ptc.get_Point(0).X + "，" + ptc.get_Point(0).Y + "," + "0,";        
37             }
38             writer.Write(strpt);
39             writer.Close();
40         }
IPolygon转换为IPoint，且点的坐标值写入txt中。