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ILayer layer = mapControl.get_Layer(1); //layer 1 is usa_base_map

ILayer があります。ストリート レイヤーや鉄道レイヤーなどのさまざまなサブレイヤーにアクセスして、オンとオフを切り替えたいと考えています。これらのレイヤーにアクセスする方法を教えてください。

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2 に答える 2

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ICompositeLayerグループレイヤーを（linky ）にキャストしたいと思うでしょう。

于 2010-08-26T07:28:31.903 に答える
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ベースマップ サブレイヤーへのアクセス 次のコード例は、ベースマップ サブレイヤーにアクセスし、内部レイヤーを取得し、内部レイヤーのプロパティを更新し、ベースマップ レイヤーに変更を通知する方法を示しています。通知によってレイヤーの内部キャッシュが無効になり、コンテンツが再描画されて更新が反映されます。この例では、更新によってフィーチャ レイヤーの定義式がクリアされます。[C#]

private void UpdateBasemapSublayerAndNotify(IBasemapLayer basemapLayer, IMap map)
{
    ICompositeLayer basemapCompositeLayer = basemapLayer as ICompositeLayer;
    IBasemapSubLayer basemapSubLayer = basemapCompositeLayer.get_Layer(0)as
        IBasemapSubLayer;
    ILayer innerLayer = basemapSubLayer.Layer;
    IFeatureLayer featureLayer = innerLayer as IFeatureLayer;
    if (featureLayer != null)
    {
        IFeatureLayerDefinition featureLayerDef = featureLayer as
            IFeatureLayerDefinition;
        featureLayerDef.DefinitionExpression = "";
    }
    //When performing operations against the wrapped layer that change properties, you must 
    //notify the basemaplayer so the display cache can be recreated if necessary.
    basemapLayer.NotifyLayerChanged(basemapSubLayer as ILayer,
        esriLayerEventHint.esriLayerEventHintProperties, null);
    IActiveView activeView = map as IActiveView;
    activeView.PartialRefresh(esriViewDrawPhase.esriViewGeography, basemapLayer as
        object, null);
}

[VB.NET]

Private Sub UpdateBasemapSublayerAndNotify(ByVal basemapLayer As IBasemapLayer, ByVal map As IMap)
    Dim basemapCompositeLayer As ICompositeLayer = TryCast(basemapLayer, ICompositeLayer)
    Dim basemapSubLayer As IBasemapSubLayer = TryCast(basemapCompositeLayer.get_Layer(0), IBasemapSubLayer)
    Dim innerLayer As ILayer = basemapSubLayer.Layer
    Dim featureLayer As IFeatureLayer = TryCast(innerLayer, IFeatureLayer)
    If featureLayer IsNot Nothing Then
        Dim featureLayerDef As IFeatureLayerDefinition = TryCast(featureLayer, IFeatureLayerDefinition)
        featureLayerDef.DefinitionExpression = ""
    End If

    'When performing operations against the wrapped layer that change properties, you must
    'notify the basemaplayer so the display cache can be recreated if necessary.
    basemapLayer.NotifyLayerChanged(TryCast(basemapSubLayer, ILayer), esriLayerEventHint.esriLayerEventHintProperties, Nothing)

    Dim activeView As IActiveView = TryCast(map, IActiveView)

    activeView.PartialRefresh(esriViewDrawPhase.esriViewGeography, TryCast(basemapLayer, Object), Nothing)
End Sub
于 2012-06-25T05:12:01.600 に答える