总结：GIS数据的查找，插入，删除，更新

1、查找数据

1）、利用FeaturCursor进行空间查询

//利用构造的Envelope（矩形框），查找和Envelope相交的FeatureClass的要素集

//结果数据利用循环FeatureCursor.nextFeature获得

IEnvelope envelope = new EnvelopeClass();

envelope.PutCoords(508786, 681196, 513033, 684341);

//空间查询

ISpatialFilter spatialFilter = new SpatialFilterClass();

spatialFilter.Geometry = envelope;

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

public static void LoadOnlyModeInsert(IFeatureClass featureClass, List<IGeometry> geometryList)
{
// Cast the feature class to the IFeatureClassLoad interface.
IFeatureClassLoad featureClassLoad = (IFeatureClassLoad)featureClass;

// Acquire an exclusive schema lock for the class.
ISchemaLock schemaLock = (ISchemaLock)featureClass;
try
{
schemaLock.ChangeSchemaLock(esriSchemaLock.esriExclusiveSchemaLock);

// Enable load-only mode on the feature class.
featureClassLoad.LoadOnlyMode = true;
using (ComReleaser comReleaser = new ComReleaser())
{
// Create the feature buffer.
IFeatureBuffer featureBuffer = featureClass.CreateFeatureBuffer();
comReleaser.ManageLifetime(featureBuffer);

// Create an insert cursor.
IFeatureCursor insertCursor = featureClass.Insert(true);
comReleaser.ManageLifetime(insertCursor);

// All of the features to be created are classified as Primary Highways.
int typeFieldIndex = featureClass.FindField("TYPE");
featureBuffer.set_Value(typeFieldIndex, "Primary Highway");

foreach (IGeometry geometry in geometryList)
{
// Set the feature buffer's shape and insert it.
featureBuffer.Shape = geometry;
insertCursor.InsertFeature(featureBuffer);
}

// Flush the buffer to the geodatabase.
insertCursor.Flush();
}
}
catch (Exception)
{
// Handle the failure in a way appropriate to the application.
}
finally
{
// Disable load-only mode on the feature class.
featureClassLoad.LoadOnlyMode = false;

// Demote the exclusive schema lock to a shared lock.
schemaLock.ChangeSchemaLock(esriSchemaLock.esriSharedSchemaLock);
}
}

[/code]

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();

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();

}