arcgis engine 基础代码

1.开始编辑，save feature property，停止编辑

IWorkspace workspace = ((IDataset)pFeatureClass).Workspace;
IWorkspaceEdit workspaceEdit = workspace as IWorkspaceEdit;

然后开启编辑状态：

bool startEdit = workspaceEdit.IsBeingEdited();
if (!startEdit)
{
    workspaceEdit.StartEditing(false);
}
workspaceEdit.StartEditOperation();

然后获取IFeatureCursor和IFeature：

pFeatureCursor = pFeatureClass.Search(pQueryFilter, false);

//注意这里一定要为false，因为http://forums.arcgis.com/threads/45879-Cannot-call-Store-on-a-recycled-row-while-editing

//如果为true可能会产生0x80040958的错误
pFeature = pFeatureCursor.NextFeature();

然后用IFeature.set_Value()方法对Feature进行属性表值的修改：

pFeature.set_Value(i, valueToSet);

修改完成，要用IFeature.store()方法保存：

pFeature.Store();

然后最好将Feature释放掉，再进行接下来的修改：

System.Runtime.InteropServices.Marshal.ReleaseComObject(pFeature);
pFeature = null;
pFeature = pFeatureCursor.NextFeature();

接下来用IFeatureCursor.Flush()：

pFeatureCursor.Flush();
System.Runtime.InteropServices.Marshal.ReleaseComObject(pFeatureCursor);

最后停止编辑状态：
workspaceEdit.StopEditOperation();
startEdit = workspaceEdit.IsBeingEdited();
if (!startEdit)
{
   workspaceEdit.StopEditing(true);
}

2.获取图层

 1         public IFeatureLayer GetFeatureLayerFromMap(string LayerName, IMap pMap)
 2         {
 3             IFeatureLayer rLayer = null;
 4             for (int i = 0; i < pMap.LayerCount; i++)
 5             {
 6                 ESRI.ArcGIS.Carto.ILayer lyr = pMap.get_Layer(i);
 7                 if (lyr is FeatureLayer)
 8                 {
 9                     if (lyr.Name.ToUpper() == LayerName.ToUpper())
10                     {
11                         rLayer = lyr as IFeatureLayer;
12                         break;
13                     }
14                     else
15                     {
16                         IFeatureClass tFeaCls = (lyr as IFeatureLayer).FeatureClass;
17                         if (tFeaCls != null && (tFeaCls as IDataset).Name.ToUpper() == LayerName.ToUpper())
18                         {
19                             rLayer = lyr as IFeatureLayer;
20                             return rLayer;
21                         }
22                         else if (tFeaCls != null && (tFeaCls as IDataset).Name.Contains("."))
23                         {
24                             if ((tFeaCls as IDataset).Name.Substring((tFeaCls as IDataset).Name.IndexOf(".") + 1).ToUpper() == LayerName.ToUpper())
25                             {
26                                 rLayer = lyr as IFeatureLayer;
27                                 return rLayer;
28                             }
29                         }
30                     }
31                 }
32                 else if (lyr is IGroupLayer)
33                 {
34                     rLayer = GetFeatureLayerFromGroupLayer(lyr, LayerName);
35                     if (rLayer != null)
36                         break;
37                 }
38             }
39             return rLayer;
40         }