C#之ArcGIS二次开发

全栈程序员-站长 • 2022年6月26日下午11:36 • 未分类 • 阅读 23

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根据图层名称获取图层

public IFeatureLayer getLayer(AxMapControl axMapControl, string layerName)
{
    if (axMapControl.LayerCount > 0)
    {
        for (int i = 0; i < axMapControl.LayerCount; i++)
        {
            ILayer pLayer = axMapControl.get_Layer(i);
            if (pLayer.Name == layerName)
                return pLayer as FeatureLayer;
        }
    }
    return null;
}

按条件查询图层要素，并闪烁

public void searchFeatures(AxMapControl mapControl,string sqlfilter,IFeatureLayer pFeatureLayer)
{
    IFeatureLayer pFeatLyr = pFeatureLayer;
    IQueryFilter pFilter = new QueryFilterClass();
    pFilter.WhereClause = sqlfilter;
    IFeatureCursor pFeatCursor = pFeatLyr.Search(pFilter,true);
    IFeature pFeat = pFeatCursor.NextFeature();
    while (pFeat != null)
    {
        if (pFeat != null)
        {
            ISimpleFillSymbol pFillsyl = new SimpleFillSymbolClass();
            RgbColor pRgbColor=new RgbColor();
            pRgbColor.Red=255;
            pRgbColor.Green=0;
            pRgbColor.Blue=0;
            pFillsyl.Color = pRgbColor;
            object oFillsyl = pFillsyl;
            IPolygon pPolygon = pFeat.Shape as IPolygon;
            mapControl.FlashShape(pPolygon, 15, 20, pFillsyl);
            mapControl.DrawShape(pPolygon, ref oFillsyl);
        }
        pFeat = pFeatCursor.NextFeature();
    }
}

sqlfilter为查询条件，如查询layer图层中，属性字段ID<10的要素：searchFeatures(axMapControl1, “ID < 10”, layer);

建立缓冲区，并添加到图层

public void SetBuffer(AxMapControl m_map, string LayerName, double bufferDistance，string OutputPath)
{
    try
    {
        IFeatureLayer layer = getLayer(m_map,LayerName);
        if (layer == null)
        {
            LogHelper.Debug("图层不存在");  #这里是自己写的日志记录方法
            return;
        }
        Geoprocessor gp = new Geoprocessor();
        gp.OverwriteOutput = true;
     
        ESRI.ArcGIS.AnalysisTools.Buffer buffer = new ESRI.ArcGIS.AnalysisTools.Buffer(layer, OutputPath, bufferDistance.ToString() + " Meters");
        IGeoProcessorResult results = (IGeoProcessorResult)gp.Execute(buffer, null);
        if (results.Status != esriJobStatus.esriJobSucceeded)
        {
            LogHelper.Debug("为图层" + layer.Name + "建立缓冲区失败\r\n");
        }

        int k = OutputPath.LastIndexOf('\\');
        string pOutFeatclsName = OutputPath.Substring((k + 1)).Trim();
        string strFolder = OutputPath.Substring(0, k);
        m_map.AddShapeFile(strFolder, pOutFeatclsName);   #添加到图层
    }
    catch (Exception ex)
    {
        LogHelper.Error(ex.Message);
    }
}



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