ArcEngine查询、添加、删除要数的方法

1、查找数据

1）、利用FeaturCursor进行空间查询

 

//空间查询

ISpatialFilter spatialFilter = new SpatialFilterClass();

spatialFilter.Geometry = envelope;//指定几何体

String shpFld = featureClass.ShapeFieldName;

spatialFilter.GeometryField = shpFld;

spatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelIntersects;//相交

IQueryFilter queryFilter = new QueryFilterClass();

queryFilter = (IQueryFilter)spatialFilter;

IFeatureCursor searchCursor = featureClass.Search(queryFilter, true);

IFeature feature = searchCursor.NextFeature();

int n = 0;

while (feature != null){

    n++;

    feature = baseCursor.NextFeature();

}

2）、利用FeatureCursor在选择集中进行查询

IFeatureSelection pFeatureSelectio = pFeatureLayer as IFeatureSelection; 

ICursor ppCursor;
pFeatureSelectio.SelectionSet.Search(null, false, out ppCursor);

IFeatureCursor pFeatureCursor = ppCursor as IFeatureCursor; 

IFeature pFeature = pFeatureCursor.NextFeature();

3）、利用FeatureCursor进行属性查询

IQueryFilter pQueryFilter = new QueryFilterClass();                           

pQueryFilter.WhereClause = "PROJECTCODE = '" + this.ProjectNumTextBox.Text.Trim() + "'";

IFeatureCursor pFeatureCursor = LineFeaClass.Search(pQueryFilter, false);                           

IFeature pFeatureIfExit = pFeatureCursor.NextFeature();

 

 

2、 插入数据

1）、利用Insert Cursors和featureBuffer

IFeatureBuffer featureBuffer = featureClass.CreateFeatureBuffer();
IFeatureCursor featureCursor = featureClass.Insert(true);
object featureOID;        
featureBuffer.set_Value(featureBuffer.Fields.FindField("InstBy"), "B Pierce");
for (int ic = 0; ic < 99; ic++)
 {
  featureBuffer.Shape = geometry;   
   featureOID = featureCursor.InsertFeature(featureBuffer);
}
featureBuffer.set_Value(featureBuffer.Fields.FindField("InstBy"), "K Johnston");
for (int ic = 0; ic < 99; ic++)
{
     featureBuffer.Shape = geometry
     featureOID = featureCursor.InsertFeature(featureBuffer);
}
featureCursor.Flush();

2）、直接进行数据插入（Feature.Store方法）

 IFeature newLineFeature = LineFeaClass.CreateFeature();                           

newLineFeature.Shape = pFeature.Shape;
int ii = newLineFeature.Fields.FindField(AreaZonalName); 

 if (ii > 0)                           

{                               

newLineFeature.set_Value(ii, this.AnalysAreaComboBox.Text.Trim());
}

newLineFeature.Store();

注：最好将编辑操作对象中，如下：

IDataset dataset = (IDataset)featureClass;

  IWorkspace workspace = dataset.Workspace;

  // Cast the workspace to the IWorkspaceEdit interface.

  IWorkspaceEdit workspaceEdit = (IWorkspaceEdit)workspace;

  // Start an edit session and edit operation.

  workspaceEdit.StartEditing(true);

  workspaceEdit.StartEditOperation();

//在这里编写添加要素的代码。。。。。。。。。。。

// Stop editing.

  workspaceEdit.StopEditOperation();

  workspaceEdit.StopEditing(true);

 

 

3、数据删除 delete 

IFeatureClass featureClass = featureWorkspace.OpenFeatureClass("Parcels");

IQueryFilter queryFilter = new QueryFilterClass();

queryFilter.WhereClause = "ZONING_S = 'R'";

IFeatureCursor updateCursor = featureClass.Update(queryFilter, false);

IFeature feature = updateCursor.NextFeature();

int m = 0;

while (feature != null)

{

    m++;

    updateCursor.DeleteFeature(feature);

    feature = updateCursor.NextFeature();

}

 

 

 

4、 数据更新 update 

IFeatureClass featureClass = featureWorkspace.OpenFeatureClass("Parcels");

// 属性查询

IQueryFilter queryFilter = new QueryFilterClass();

queryFilter.WhereClause = "ZONING_S = 'U'";

//利用FeatureCursor进行数据更新

IFeatureCursor updateCursor = featureClass.Update(queryFilter, false);

int fieldindex = featureClass.FindField("ZONING_S");

IFeature feature = updateCursor.NextFeature();

int m = 0;

while (feature != null)

{

    m++;

    feature.set_Value(fieldindex, "X");

    updateCursor.UpdateFeature(feature);

    feature = updateCursor.NextFeature();

}