C#+AE 创建几何网络

 几何网络必须存在数据集中,Engine创建的时候要有geodatabase updata 许可,我的数据库是个人数据库。

先看一下ArcMap是怎么创建的
在catalog中打开创建几个网络的向导


几何网络的名称


选中参与网络的要素


是否启用enable字段


数据集的角色



创建权重字段

权重字段和相应的字段关联




结果如下：

1. ///
   
   
2. /// 打开个人数据库
   
3. ///
   
4. ///
   
5. ///
   
6. public IWorkspace GetWorkspace(String _pGDBName)
   
7. {
   
8. IWorkspaceFactory pWsFac = new AccessWorkspaceFactoryClass();
   
9. 
   
10. IWorkspace pWs = pWsFac.OpenFromFile(_pGDBName,0);
    
11. 
    
12. return pWs;
    
13. }
    
14. 
    
15. public void CreateGeometricNetwork(IWorkspace _pWorkspace, IFeatureDatasetName
    
16. _pFeatureDatasetName,String _pGeometricName)
    
17. {
    
18. 
    
19. INetworkLoader2 pNetworkLoader = new NetworkLoaderClass();
    
20. 
    
21. // 网络的名称
    
22. pNetworkLoader.NetworkName = _pGeometricName;
    
23. 
    
24. // 网络的类型
    
25. pNetworkLoader.NetworkType = esriNetworkType.esriNTUtilityNetwork;
    
26. 
    
27. // Set the containing feature dataset.
    
28. pNetworkLoader.FeatureDatasetName = (IDatasetName)_pFeatureDatasetName;
    
29. 
    
30. 
    
31. // 检查要建立几何网络的数据，每一个要素只能参与一个网络
    
32. if (pNetworkLoader.CanUseFeatureClass("PrimaryLine") ==
    
33. esriNetworkLoaderFeatureClassCheck.esriNLFCCValid)
    
34. {
    
35. pNetworkLoader.AddFeatureClass("PrimaryLine",
    
36. esriFeatureType.esriFTComplexEdge, null, false);
    
37. }
    
38. 
    
39. if (pNetworkLoader.CanUseFeatureClass("Feeder") ==
    
40. esriNetworkLoaderFeatureClassCheck.esriNLFCCValid)
    
41. {
    
42. pNetworkLoader.AddFeatureClass("Feeder", esriFeatureType.esriFTSimpleJunction,
    
43. null, false);
    
44. }
    
45. 
    
46. // 我的数据中没有enable字段，所以，用了false，如果用true的话，就要进行相关的设置
    
47. 
    
48. INetworkLoaderProps pNetworkLoaderProps = (INetworkLoaderProps)pNetworkLoader;
    
49. 
    
50. pNetworkLoader.PreserveEnabledValues = false;
    
51. 
    
52. 
    
53. // Set the ancillary role field for the Feeder class.
    
54. String defaultAncillaryRoleFieldName =
    
55. pNetworkLoaderProps.DefaultAncillaryRoleField;
    
56. esriNetworkLoaderFieldCheck ancillaryRoleFieldCheck =
    
57. pNetworkLoader.CheckAncillaryRoleField("Feeder",
    
58. defaultAncillaryRoleFieldName);
    
59. switch (ancillaryRoleFieldCheck)
    
60. {
    
61. case esriNetworkLoaderFieldCheck.esriNLFCValid:
    
62. case esriNetworkLoaderFieldCheck.esriNLFCNotFound:
    
63. pNetworkLoader.PutAncillaryRole("Feeder",
    
64. esriNetworkClassAncillaryRole.esriNCARSourceSink,
    
65. defaultAncillaryRoleFieldName);
    
66. break;
    
67. default:
    
68. Console.WriteLine(
    
69. "The field {0} could not be used as an ancillary role field.",
    
70. defaultAncillaryRoleFieldName);
    
71. break;
    
72. }
    
73. 
    
74. 
    
75. 
    
76. pNetworkLoader.SnapTolerance = 0.02;
    
77. 
    
78. // 给几何网络添加权重
    
79. pNetworkLoader.AddWeight("Weight", esriWeightType.esriWTDouble, 0);
    
80. 
    
81. 
    
82. 
    
83. // 将权重和PrimaryLine数据中的SHAPE_Length字段关联
    
84. pNetworkLoader.AddWeightAssociation("Weight", "PrimaryLine", "SHAPE_Length");
    
85. 
    
86. // 构建网络
    
87. pNetworkLoader.LoadNetwork();
    
88. 
    
89. 
    
90. }
    
91. 
    
92. 
    
93. IWorkspace pWs = GetWorkspace(@"E:\arcgis\Engine\Geometric.mdb");
    
94. 
    
95. IFeatureWorkspace pFtWs = pWs as IFeatureWorkspace;
    
96. 
    
97. IFeatureDataset pFtDataset = pFtWs.OpenFeatureDataset("work");
    
98. 
    
99. IDataset pDataset = pFtDataset as IDataset;
    
100. 
     
101. IFeatureDatasetName pFtDatasetName = pDataset.FullName as IFeatureDatasetName;
     
102. 
     
103. CreateGeometricNetwork(pWs, pFtDatasetName, "TestGeometric");

复制代码

效果如下：