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();

}