通過在新建的窗體中的RadioButton來實現在MapControl上畫出向量圖形，用到介面有ICommand,ITool。
用到的方法有TrackPolyLine(),TrackPolygon(),MapToPoint(),三個方法建立向量要素，通過IElement介面建立的物件的Geometry屬性接收IGeometry介面定義的，通過IElement介面的element型別物件，AddElement方法新增到MapControl的屬性GraphicsContainer中並且通過axMapControl物件重新整理MapControl視窗。
最後通過ISimpleMarkerSymbol介面設定物件的RGB值，將該物件給予IElement物件，實現向量要素的symbol更改。

建立步驟及程式碼如下

1、新建createfeature類
新增引用

using ESRI.ArcGIS.Carto;
using ESRI.ArcGIS.SystemUI;
using ESRI.ArcGIS.esriSystem;
using ESRI.ArcGIS.Controls;
using ESRI.ArcGIS.Geometry;
using ESRI.ArcGIS.Geodatabase;
using ESRI.ArcGIS.DataSourcesFile;
using ESRI.ArcGIS.Display;
using ESRI.ArcGIS.ADF;

定義全域性變數

IMapControlDefault mapp;

例項窗體

createfeatureform fr = new createfeatureform();

實現ICommand介面，ITool介面，在如下位置新增對應程式碼

public void OnClick()
        {
            fr.Show();
        }
        public void OnCreate(object Hook)
        {
            mapp = Hook as IMapControlDefault;
        }
        public void OnMouseDown(int button, int shift, int x
 
, int y)
        {
            //GraphicsContainer新增資料須新增IElement型別的Object
            if(fr.radioButton1.Checked)
            {
            IGeometry point = mapp.ToMapPoint(x, y);
            IElement pelement = new MarkerElementClass();
            pelement.Geometry = point;
            ISimpleMarkerSymbol psims = new SimpleMarkerSymbolClass();
            psims.Style = esriSimpleMarkerStyle.esriSMSCircle;
            psims.Size = 5;
            IRgbColor prgb = new RgbColorClass();
            prgb.Blue = 255;
            prgb.Red = 0;
            prgb.Green = 0;
            psims.Color = prgb;
            (pelement as IMarkerElement).Symbol = psims;
            mapp.ActiveView.GraphicsContainer.AddElement(pelement,0);
            }
            if (fr.radioButton2.Checked)
            {
                IGeometry line = mapp.TrackLine();
                IElement pelement = new LineElementClass();
                pelement.Geometry = line;
                mapp.ActiveView.GraphicsContainer.AddElement(pelement, 0);
            }
            if (fr.radioButton3.Checked)
            {
                IGeometry polygon = mapp.TrackPolygon();
                IElement pelement = new PolygonElementClass();
                pelement.Geometry = polygon;
                mapp.ActiveView.GraphicsContainer.AddElement(pelement, 0);
            }
            if (fr.radioButton4.Checked)
            {
                IGeometry ptext = mapp.ToMapPoint(x, y);
                IElement pelement = new TextElementClass();
                (pelement as ITextElement).Text = fr.textBox1.Text;
                pelement.Geometry = ptext;
                mapp.ActiveView.GraphicsContainer.AddElement(pelement, 0);
            }
            mapp.ActiveView.Refresh();
        }

2、新建窗體，佈局如圖所示：

3、主視窗TooltripButton事件程式碼如下

 private void toolStripButton1_Click(object sender, EventArgs e)
        {
            ICommand createfeature = new createfeature();
            createfeature.OnCreate(axMapControl1.Object);
            createfeature.OnClick();
            ITool ptool = createfeature as ITool;
            axMapControl1.CurrentTool = ptool;
        }