Arcgis Engine栅格渲染（唯一值）IRasterUniqueValueRenderer

参照官方代码后改造而成，有没有属性表都支持。

 

public static bool UniqueValueRenderer(IColorRamp colorRamp, IRasterLayer rasterLayer, string renderfiled="Value")        {            try            {                IRasterUniqueValueRenderer uniqueValueRenderer = new RasterUniqueValueRendererClass();                                IRasterRenderer pRasterRenderer = uniqueValueRenderer as IRasterRenderer;                pRasterRenderer.Raster = rasterLayer.Raster;                pRasterRenderer.Update();                IUniqueValues uniqueValues = new UniqueValuesClass();                IRasterCalcUniqueValues calcUniqueValues = new RasterCalcUniqueValuesClass();                calcUniqueValues.AddFromRaster(rasterLayer.Raster, 0, uniqueValues);//iBand=0                IRasterRendererUniqueValues renderUniqueValues = uniqueValueRenderer as IRasterRendererUniqueValues;                renderUniqueValues.UniqueValues = uniqueValues;                uniqueValueRenderer.Field = renderfiled;                colorRamp.Size = uniqueValues.Count;                uniqueValueRenderer.HeadingCount = 1;                uniqueValueRenderer.set_Heading(0, "All Data Value");                uniqueValueRenderer.set_ClassCount(0, uniqueValues.Count);                bool pOk;                colorRamp.CreateRamp(out pOk);                IRasterRendererColorRamp pRasterRendererColorRamp = uniqueValueRenderer as IRasterRendererColorRamp;                pRasterRendererColorRamp.ColorRamp = colorRamp;                for (int i = 0; i < uniqueValues.Count; i++)                {                    uniqueValueRenderer.AddValue(0, i, uniqueValues.get_UniqueValue(i));                    uniqueValueRenderer.set_Label(0, i, uniqueValues.get_UniqueValue(i).ToString());                    IFillSymbol fs=new SimpleFillSymbol();                    fs.Color = colorRamp.get_Color(i);                    uniqueValueRenderer.set_Symbol(0, i, fs as ISymbol);                }                pRasterRenderer.Update();                rasterLayer.Renderer = pRasterRenderer;            }            catch(Exception ex)            {                return false;            }            return true;        }

官方代码如下：

http://resources.esri.com/help/9.3/arcgisengine/dotnet/77da7a38-c696-407d-b73c-ddb36def6032.htm

public IRasterRenderer UnqueValueRenderer  (ESRI.ArcGIS.Geodatabase.IRasterDataset rasterDataset){  try  {    //Get the raster attribute table and the size of the table.    IRaster2 raster = (IRaster2)rasterDataset.CreateDefaultRaster();    ITable rasterTable = raster.AttributeTable;    if (rasterTable == null)    {      return null;    }    int tableRows = rasterTable.RowCount(null);    //Create colors for each unique value.    IRandomColorRamp colorRamp = new RandomColorRampClass();    colorRamp.Size = tableRows;    colorRamp.Seed = 100;    bool createColorRamp;    colorRamp.CreateRamp(out createColorRamp);    if (createColorRamp == false)    {      return null;    }    //Create a unique value renderer.    IRasterUniqueValueRenderer uvRenderer = new RasterUniqueValueRendererClass()      ;    IRasterRenderer rasterRenderer = (IRasterRenderer)uvRenderer;    rasterRenderer.Raster = rasterDataset.CreateDefaultRaster();    rasterRenderer.Update();    //Set the renderer properties.    uvRenderer.HeadingCount = 1;    uvRenderer.set_Heading(0, "All Data Value");    uvRenderer.set_ClassCount(0, tableRows);    uvRenderer.Field = "Value"; //Or any other field in the table.    IRow row;    ISimpleFillSymbol fillSymbol;    for (int i = 0; i < tableRows; i++)    {      row = rasterTable.GetRow(i);      uvRenderer.AddValue(0, i, Convert.ToByte(row.get_Value(1)));         // Assuming the raster is 8-bit.      uvRenderer.set_Label(0, i, Convert.ToString(row.get_Value(1)));      fillSymbol = new SimpleFillSymbolClass();      fillSymbol.Color = colorRamp.get_Color(i);      uvRenderer.set_Symbol(0, i, (ISymbol)fillSymbol);    }    return rasterRenderer;  }  catch (Exception ex)  {    System.Diagnostics.Debug.WriteLine(ex.Message);    return null;  }}