ArcGIS Engine常用开发代码整理（1）

1. 创建工作空间工厂——EDN

public void IWorkspaceFactory_Create_Example_Access()    {

// create a new Access workspace factory       
IWorkspaceFactory workspaceFactory = new ESRI.ArcGIS.DataSourcesGDB.AccessWorkspaceFactoryClass();       

// Create a workspacename with the workspace factory 

IWorkspaceName workspaceName = workspaceFactory.Create("C:\\temp\\", "MyNewpGDB.mdb", null, 0);       
// Cast for IName      
ESRI.ArcGIS.esriSystem.IName name = (ESRI.ArcGIS.esriSystem.IName)workspaceName;       

//Open a reference to the access workspace through the name object        
IWorkspace pGDB_workspace = (IWorkspace)name.Open();

Console.WriteLine("Current path of the {0} is {1}", pGDB_workspace.Type, pGDB_workspace.PathName);    

} 

 2. 遍历所有图层

 注意帮助文档中“Loop Through Layers of Specific UID Snippet”主题中详细列出了不同的UIDClass过滤选项，替换get_layers()中的null：

/// The different layer GUID's and Interface's are:
/// "{AD88322D-533D-4E36-A5C9-1B109AF7A346}" = IACFeatureLayer
/// "{74E45211-DFE6-11D3-9FF7-00C04F6BC6A5}" = IACLayer
/// "{495C0E2C-D51D-4ED4-9FC1-FA04AB93568D}" = IACImageLayer
/// "{65BD02AC-1CAD-462A-A524-3F17E9D85432}" = IACAcetateLayer
/// "{4AEDC069-B599-424B-A374-49602ABAD308}" = IAnnotationLayer
/// "{DBCA59AC-6771-4408-8F48-C7D53389440C}" = IAnnotationSublayer
/// "{E299ADBC-A5C3-11D2-9B10-00C04FA33299}" = ICadLayer
/// "{7F1AB670-5CA9-44D1-B42D-12AA868FC757}" = ICadastralFabricLayer
/// "{BA119BC4-939A-11D2-A2F4-080009B6F22B}" = ICompositeLayer
/// "{9646BB82-9512-11D2-A2F6-080009B6F22B}" = ICompositeGraphicsLayer
/// "{0C22A4C7-DAFD-11D2-9F46-00C04F6BC78E}" = ICoverageAnnotationLayer
/// "{6CA416B1-E160-11D2-9F4E-00C04F6BC78E}" = IDataLayer
/// "{0737082E-958E-11D4-80ED-00C04F601565}" = IDimensionLayer
/// "{48E56B3F-EC3A-11D2-9F5C-00C04F6BC6A5}" = IFDOGraphicsLayer
/// "{40A9E885-5533-11D0-98BE-00805F7CED21}" = IFeatureLayer
/// "{605BC37A-15E9-40A0-90FB-DE4CC376838C}" = IGdbRasterCatalogLayer
/// "{E156D7E5-22AF-11D3-9F99-00C04F6BC78E}" = IGeoFeatureLayer
/// "{34B2EF81-F4AC-11D1-A245-080009B6F22B}" = IGraphicsLayer
/// "{EDAD6644-1810-11D1-86AE-0000F8751720}" = IGroupLayer
/// "{D090AA89-C2F1-11D3-9FEF-00C04F6BC6A5}" = IIMSSubLayer
/// "{DC8505FF-D521-11D3-9FF4-00C04F6BC6A5}" = IIMAMapLayer
/// "{34C20002-4D3C-11D0-92D8-00805F7C28B0}" = ILayer
/// "{E9B56157-7EB7-4DB3-9958-AFBF3B5E1470}" = IMapServerLayer
/// "{B059B902-5C7A-4287-982E-EF0BC77C6AAB}" = IMapServerSublayer
/// "{82870538-E09E-42C0-9228-CBCB244B91BA}" = INetworkLayer
/// "{D02371C7-35F7-11D2-B1F2-00C04F8EDEFF}" = IRasterLayer
/// "{AF9930F0-F61E-11D3-8D6C-00C04F5B87B2}" = IRasterCatalogLayer
/// "{FCEFF094-8E6A-4972-9BB4-429C71B07289}" = ITemporaryLayer
/// "{5A0F220D-614F-4C72-AFF2-7EA0BE2C8513}" = ITerrainLayer
/// "{FE308F36-BDCA-11D1-A523-0000F8774F0F}" = ITinLayer
/// "{FB6337E3-610A-4BC2-9142-760D954C22EB}" = ITopologyLayer
/// "{005F592A-327B-44A4-AEEB-409D2F866F47}" = IWMSLayer
/// "{D43D9A73-FF6C-4A19-B36A-D7ECBE61962A}" = IWMSGroupLayer
/// "{8C19B114-1168-41A3-9E14-FC30CA5A4E9D}" = IWMSMapLayer

示例：

    IMap pMap = axMapControl1.Map;


     IEnumLayer pEnumLayer = pMap.get_Layers(null, true);


     pEnumLayer.Reset();


     ILayer pLayer = pEnumLayer.Next();


     while (pLayer != null)


     {


        // Console.WriteLine(pLayer.Name);             


         pLayer = pEnumLayer.Next();


     }

3. 判断图层类型

http://bbs.esrichina-bj.cn/ESRI/thread-59674-1-1.html

4. 【转】根据图层名称找到当前的图层的两种方法

http://www.gisempire.com/blog/user1/1/58.html

'功能：根据图层名称找到当前的图层
'返回：当前图层对象
Private Function GetCurLayer() As ILayer

    Dim i As Integer

    Set GetCurLayer = Nothing

    For i = 0 To ff_m_Map.LayerCount - 1

        If UCase$(ff_m_Map.Layer(i).Name) = UCase$(ff_m_strCurLayername) Then

            Set GetCurLayer = ff_m_Map.Layer(i)

            Exit For

       End If

    Next i

End Function


'功能：找到当前的图层
'返回：当前图层对象
'修改时间：
Private Function GetCurLayer() As ILayer

   Set ff_m_ActiveView = ff_m_Map

   Dim pEnumLayer As IEnumLayer

   Dim pId As IFeatureLayer

   Dim pLayer As ILayer

   Set ff_m_Map = ff_m_ActiveView.FocusMap

   Set pEnumLayer = ff_m_Map.Layers(pId, True)

   Set GetCurLayer = Nothing

    pEnumLayer.Reset

    Set pLayer = pEnumLayer.Next

    Do While Not pLayer Is Nothing

    If UCase$(pLayer.Name) = UCase$(ff_m_strCurLayername) Then

      Set GetCurLayer = pLayer

    End If

    Set pLayer = pEnumLayer.Next

    Loop

End Function

5. 打开TIN数据集

public ILayer openTinLayer(string fullPath)


    {


        ITinWorkspace pTinWorkspace;


        IWorkspace pWS;


        IWorkspaceFactory pWSFact = new TinWorkspaceFactoryClass();


       // ITinLayer pTinLayer = new TinLayerClass();


        string pathToWorkspace = System.IO.Path.GetDirectoryName(fullPath);


        string tinName = System.IO.Path.GetFileName(fullPath);


        pWS = pWSFact.OpenFromFile(pathToWorkspace, 0);


        pTinWorkspace = pWS as ITinWorkspace;


        if (pTinWorkspace.get_IsTin(tinName))


        {


            pTin = pTinWorkspace.OpenTin(tinName);


            pTinLayer.Dataset = pTin;


            pTinLayer.ClearRenderers();


            return pTinLayer as ILayer;


        }


        else


        {


            MessageBox.Show("该目录不包含Tin文件");


            return null;


        }


    }

6. 读取选中的IElement对象

http://bbs.esrichina-bj.cn/ESRI/thread-101968-1-1.html

7. 通过点的集合IPointCollection构建线IPolyline或面要素IPolygon

IPolyline m_ProfilePolyline =new PolylineClass();


IPointCollection m_PtCol = m_ProfilePolyline as IPointCollection;


IPoint pPoint1 = new PointClass();


pPoint1.X = x ;


pPoint1.Y = y;


m_PtCol.AddPoint(pPoint1, ref missing, ref missing);


IPoint pPoint2 = new PointClass();


pPoint2.X = x ;


pPoint2.Y = y;


m_PtCol.AddPoint(pPoint2, ref missing, ref missing);

8. 【转】平头缓冲

http://www.cnblogs.com/zuiyirenjian/archive/2011/01/13/1934267.html（AE中应该提供了其他的接口，这里主要学习点的操作）思路就是将线向左右两边移动相同的距离，然后将一条线的方向反向，加入另外一条，构造矩形或者矩形面

private IPolygon FlatBuffer(IPolyline myLine, double bufferDis)


{


    object o = System.Type.Missing;


    //分别对输入的线平移两次（正方向和负方向）


    IConstructCurve mycurve = new PolylineClass();


    mycurve.ConstructOffset(myLine, bufferDis, ref o, ref o);


    IPointCollection pCol = mycurve as IPointCollection;


    IConstructCurve mycurve2 = new PolylineClass();


    mycurve2.ConstructOffset(myLine, -1 * bufferDis, ref o, ref o);


    //把第二次平移的线的所有节点翻转


    IPolyline addline = mycurve2 as IPolyline;


    addline.ReverseOrientation();


    //把第二条的所有节点放到第一条线的IPointCollection里面


    IPointCollection pCol2 = addline as IPointCollection;


    pCol.AddPointCollection(pCol2);


    //用面去初始化一个IPointCollection


    IPointCollection myPCol = new PolygonClass();


    myPCol.AddPointCollection(pCol);


    //把IPointCollection转换为面


    IPolygon myPolygon = myPCol as IPolygon;


    //简化节点次序


    myPolygon.SimplifyPreserveFromTo();


    return myPolygon;


}

9. 遍历要素类中的所有字段

IField pField = null;


    IFields pFields = pFeatureClass.Fields;


    for (int i = 0; i < pFields.FieldCount - 1;i++ )


    {


         pField = pFields.get_Field(i);


         if (pField.Type!=esriFieldType.esriFieldTypeGeometry)


         {


           dgvCombo.Items.Add(pField.Name);


         }


}

10. 获取图层的3DProperties

/// <summary>

/// 获取图层三维属性

/// </summary>

/// <param name="pTinLayer">pFeatLayer图层</param>

/// <returns></returns>


public I3DProperties get3DProps(IFeatureLayer pFeatLayer)


{


      I3DProperties p3DProps = null;


      ILayer pLayer = pFeatLayer as ILayer;


      ILayerExtensions lyrExt = pLayer as ILayerExtensions;


      for (int i = 0; i < lyrExt.ExtensionCount; i++)


      {


           if (lyrExt.get_Extension(i) is I3DProperties)


           {


             p3DProps = lyrExt.get_Extension(i) as I3DProperties;


           }


       }


       return p3DProps;


}


pSceneControl.Scene.AddLayer(pLyr,false);


//必须先添加图层到Scene中


I3DProperties p3DProps = get3DProps(pFeatLyr);


p3DProps.ExtrusionType = esriExtrusionType.esriExtrusionAbsolute;


p3DProps.ExtrusionExpressionString = "["+combHeight.Text+"]";


p3DProps.Apply3DProperties(pFeatLyr);

 11.符号化的基本过程

 

ISimpleLineSymbol pSimpleLineSymbol = new SimpleLineSymbolClass();
        pSimpleLineSymbol.Width = 1;
        pSimpleLineSymbol.Style = esriSimpleLineStyle.esriSLSSolid;
        pSimpleLineSymbol.Color = ColorAndIcolor.ConvertColorToIColor(pColor);
　  　 IElement plyrLineEle = null;
        ILineElement pLine = new LineElementClass();
        pLine.Symbol = pSimpleLineSymbol as ILineSymbol;
        plyrLineEle = pLine as IElement;
        plyrLineEle.Geometry = pol;
        _graphicContainer.AddElement(plyrLineEle, 0);


    static class ColorAndIcolor
    {
        public static IColor ConvertColorToIColor(Color color)
        {
            IColor pColor = new RgbColorClass();
            pColor.RGB = color.B * 65536 + color.G * 256 + color.R;
            return pColor;
        }
        //转换颜色 
       //Color color = ColorTranslator.FromOle(IColor.RGB);
    }