IFeatureClass Select

最新推荐文章于 2020-08-31 23:59:51 发布

mydriverc

最新推荐文章于 2020-08-31 23:59:51 发布

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本文链接：https://blog.youkuaiyun.com/mydriverc/article/details/1698801

本文解析了ArcGIS中选择集API的使用方法，包括三种选择类型：基于OID集合的选择(esriSelectionTypeIDSet)、基于内存行对象的选择(esriSelectionTypeSnapshot)以及混合型选择(esriSelectionTypeHybrid)。此外还介绍了三种选择选项及其应用场景。

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[C#]
public ISelectionSet Select (
    IQueryFilter QueryFilter,
    esriSelectionType selType,
    esriSelectionOption selOption,
    IWorkspace selectionContainer
);

Selection Type.

Constant	Value	Description
esriSelectionTypeIDSet	1	IDSet.
esriSelectionTypeSnapshot	2	Snapshot.
esriSelectionTypeHybrid	3	Snapshot if small, else an ID Set.

esriSelectionTypeIDSet
The selection is always based on a persistent set of OIDs (e.g. logfiles for ArcSDE)

代表选择集使用的使用的是一个OID集合，这些OID可能保存再一个物理表中，也可能保存在内存中，这取决于数据源的类型。

esriSelectionTypeSnapshot
The selection is always based on a set of in-memory rows (e.g. no logfile just in-memory IRow(s))

表明选择集使用的是保存在内存中的行对象

esriSelectionTypeHybrid
The selection itself decides how to manage its representation (e.g. it may morph between IDSet and Snapshot)

当选择集数量少的时候，选择集使用的是在内存中的行对象，当数量多的时候是使用OID对象。

esriSelectionOption Constants

Selection Option.

Constant	Value	Description
esriSelectionOptionNormal	1	Normal - the selection is created based on the input query filter, all rows are selected if the query filter is null.
esriSelectionOptionOnlyOne	2	Only One - the selection is created based on the input query filter, only the first row is selected.
esriSelectionOptionEmpty	3	Empty - an empty selection is created.