Arcengine效率探究之一

Arcengine的函数读取属性值的问题。

ITable pTable = pLayer.FeatureClass as ITable;

clsFldValue = pTable.GetRow(i).get_Value(3);

IFeatureCursor FCursor = pLayer.FeatureClass.Search(new QueryFilterClass(), false);

IFeature feature = FCursor.NextFeature();

if (feature == null) return null;

clsFldValue = feature.get_Value(clsFldIndex);

feature = FCursor.NextFeature();

用Environment.TickCount 4984ms,而方法二读取同一个属性给的时间仅为32 ms156

一、FeatureCursor方法

IFeatureLayer pLayer = Utilities.GetLayerByName((string)cmbRegLayers.SelectedItem, m_mapControl) as IFeatureLayer;

IFeatureCursor FCursor = pLayer.FeatureClass.Search(new QueryFilterClass(), false);

IFeature feature = FCursor.NextFeature(); int t = Environment.TickCount;

object clsFldValue=null;

for (int i = 0; i < pLayer.FeatureClass.FeatureCount(null); i++)

{

clsFldValue = feature.get_Value(3);

feature = FCursor.NextFeature();

}

t = Environment.TickCount - t;

MessageBox.Show(t.ToString());

二、 ITable 方法读取

ITable pTable = pLayer.FeatureClass as ITable;

t = Environment.TickCount;

for (int i = 0; i < pTable.RowCount(null); i++)

clsFldValue = pTable.GetRow(i).get_Value(3);

t = Environment.TickCount - t;

MessageBox.Show(t.ToString());

至于为什么使用ITable

ESRI

此

目标是想将原数据库中的点信息(x,y经纬度坐标,度格式),添加到FeatureClass中大概有10000条数据,全部添加到FeatureClass中大概需要半小时以上

DataSet ds = loadExcel(\"d://aaa.xls\");

IFeature feature = featureClass.CreateFeature();

IFields fields = featureClass.Fields;

for(int i=0;iDataRow row = ds.Tables[0].Rows[i];

string xl = Convert.ToString(row[0]);

string x = Convert.ToDouble(row[1]);

string y = Convert.ToDouble(row[2]);

//....其它数据库中字段

//创建点对象

IPoint point = new PointClass();

point.X = x;

point.Y = y;

//设置Fields域

feature.set_Value(fields.FindField(\"线路\"),xl);

feature.set_Value(fields.FindField(\"经度\"),x);

feature.set_Value(fields.FindField(\"纬度\"),y); //保存点对象

feature.Shape = point;

feature.Store();

}

DataSet ds = loadExcel(\"d://aaa.xls\");

IFeatureBuffer featureBuffer;

IFeatureCursor cur = featureClass.Insert(true);

IPoint point;

IFields fields = featureClass.Fields;

for(int i=0;iDataRow row = ds.Tables[0].Rows[i];

string xl = Convert.ToString(row[0]);

string x = Convert.ToDouble(row[1]);

string y = Convert.ToDouble(row[2]);

//....其它数据库中字段

//创建点对象

point = new PointClass(); point.X = x;

point.Y = y;

featureBuffer = featureClass.CreateFeatureBuffer();

//设置Fields域

featureBuffer.set_Value(fields.FindField(\"线路\"),xl);

featureBuffer.set_Value(fields.FindField(\"经度\"),x);

featureBuffer.set_Value(fields.FindField(\"纬度\"),y);

//保存点对象

featureBuffer.Shape = point;

cur.InsertFeature(featureBuffer); }

可以看出改进后使用了eatureClass.CreateFeatureBuffer