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();
}