ArcEngine效率探索--添加要素

版本

ArcGis 10.1，C#

ArcEngine中添加要素的方式有两种

一种使用IFeatureClass.CreateFeature和IFeature.Store方法实现
一种使用IFeatureClass.CreateFeatureBuffer的insert cursor来实现
插入大量数据时用insert cursor的效率高于CreateFeature和Store方法。

使用CreateFeature和Store创建要素

public static CreateFeature(IFeatureClass featureClass, IPolyline polyline)
{
    // Build the feature.
    IFeature feature = featureClass.CreateFeature();
    feature.Shape = polyline;
 
    // Apply the appropriate subtype to the feature.
    ISubtypes subtypes = (ISubtypes)featureClass;
    IRowSubtypes rowSubtypes = (IRowSubtypes)feature;
    if (subtypes.HasSubtype)
    {
        // In this example, the value of 3 represents the polymer vinyl chloride (PVC) subtype.
        rowSubtypes.SubtypeCode = 3;
    }
 
    // Initialize any default values the feature has.
    rowSubtypes.InitDefaultValues();
 
    // Update the value on a string field that indicates who installed the feature.
    int contractorFieldIndex = featureClass.FindField("CONTRACTOR");
    feature.set_Value(contractorFieldIndex, "K Johnston");
 
    // Commit the new feature to the geodatabase.
    feature.Store();
}

使用insert cursor创建要素

public static void InsertFeaturesUsingCursor(IFeatureClass featureClass, List <
    IGeometry > geometryList)
{
    using(ComReleaser comReleaser = new ComReleaser())
    {
        // Create a 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();
    }
}