using System.Collections; using System.Windows.Forms; using ESRI.ArcGIS.Display; using ESRI.ArcGIS.Carto; using ESRI.ArcGIS.esriSystem; using ESRI.ArcGIS.Geodatabase;

private ISymbol GetSymbol(IColor pColor)         {             ISymbol pSymbol;             ISimpleFillSymbol pSymbolFillSymbol = new SimpleFillSymbolClass();             pSymbolFillSymbol.Color = pColor;             pSymbolFillSymbol.Outline.Width = 0.4;             pSymbol = pSymbolFillSymbol as ISymbol;             return pSymbol;         }  private void uniqueValueRendererToolStripMenuItem_Click(object sender, EventArgs e)         {             IMap pMap = this.axMapControl1.ActiveView.FocusMap;             if (pMap.LayerCount== 0)             {                 MessageBox.Show("地图为空，请加载地图！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);                 return;             }             IGeoFeatureLayer pGeoLayer = this.axMapControl1.get_Layer(0) as IGeoFeatureLayer ;             ITable pTable = pGeoLayer.FeatureClass as ITable;             ICursor pCursor;             IQueryFilter pQueryFilter = new QueryFilter();             pQueryFilter.AddField("PERIMETER");             pCursor = pTable.Search(pQueryFilter, true);//获取字段             IEnumerator pEnumreator;             //获取字段中各要素属性唯一值             IDataStatistics pDataStatistics = new DataStatisticsClass();             pDataStatistics.Field = "PERIMETER";//获取统计字段             pDataStatistics.Cursor = pCursor;             pEnumreator = pDataStatistics.UniqueValues;             int fieldcount = pDataStatistics.UniqueValueCount;//唯一值个数，以此确定颜色带范围             IUniqueValueRenderer pUniqueValueR = new UniqueValueRendererClass();             pUniqueValueR.FieldCount = 1;//单值渲染             pUniqueValueR.set_Field(0, "PERIMETER");//渲染字段             IEnumColors pEnumColor = GetColorRamp(fieldcount).Colors;             pEnumColor.Reset();             while (pEnumreator.MoveNext())             {                 string value = pEnumreator.Current.ToString();                 if (value != null)                 {                     IColor pColor = pEnumColor.Next();                     ISymbol pSymbol = GetSymbol(pColor);                     pUniqueValueR.AddValue(value, "PERIMETER", pSymbol);                     //pUniqueValueR.set_Symbol(value, pSymbol);                 }             }             pGeoLayer.Renderer = pUniqueValueR as IFeatureRenderer;             this.axMapControl1.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeography, null, null);             this.axTOCControl1.Update();         }         private IRandomColorRamp GetColorRamp(int size)         {             IRandomColorRamp pRandomColorRamp = new RandomColorRampClass();             pRandomColorRamp.StartHue = 10;             pRandomColorRamp.EndHue = 300;             pRandomColorRamp.MaxSaturation =100;             pRandomColorRamp.MinSaturation = 0;             pRandomColorRamp.MaxValue = 100;             pRandomColorRamp.MinValue = 0;             pRandomColorRamp.Size = size;             bool ok = true;             pRandomColorRamp.CreateRamp(out ok);             return pRandomColorRamp;         }