AE构建获取栅格图层属性表（ITable）

/// <summary>
/// 构建栅格图层属性表
/// </summary>
/// <param name="pLayer">图层</param>
/// <returns>属性表ITable</returns>
public static ITable BuildRasterTable(ILayer pLayer)
{
if (!(pLayer is IRasterLayer)) return null;
IRasterLayer rasterLayer = pLayer as IRasterLayer;
IRaster pRaster = rasterLayer.Raster;
IRasterProps rProp = pRaster as IRasterProps;
if (rProp == null)
{
return null;
}
if (rProp.PixelType == rstPixelType.PT_FLOAT || rProp.PixelType == rstPixelType.PT_DOUBLE) //判断栅格像元值是否是整型
{
return null;
}
IRasterBandCollection pRasterbandCollection = (IRasterBandCollection)pRaster;
IRasterBand rasterBand = pRasterbandCollection.Item(0);
ITable rTable = rasterBand.AttributeTable;
if (rTable != null) return rasterBand.AttributeTable; //直接获取属性表

string strPath = rasterLayer.FilePath;
string strDirName = System.IO.Path.GetDirectoryName(strPath);
string strRasterName = System.IO.Path.GetFileName(strPath);
//创建工作空间
IWorkspaceFactory pWork = new RasterWorkspaceFactoryClass();
//打开工作空间路径 ，工作空间的参数是目录，不是具体的文件名
IRasterWorkspace pRasterWs = (IRasterWorkspace)pWork.OpenFromFile(strDirName, 0);
//打开工作空间下的文件，
IRasterDataset rasterDataset = pRasterWs.OpenRasterDataset(strRasterName);
IRasterDatasetEdit2 rasterDatasetEdit = (IRasterDatasetEdit2)rasterDataset;
if (rasterDatasetEdit == null)
{
return null;
}
//Build default raster attribute table with VALUE and COUNT
rasterDatasetEdit.BuildAttributeTable();  //建立属性表
//更新属性表
pRasterbandCollection = (IRasterBandCollection)rasterDataset;
rasterBand = pRasterbandCollection.Item(0);
return rasterBand.AttributeTable;    //重新获取属性表
}

/// <summary>
/// 获取栅格图层的属性表
/// </summary>
/// <param name="layer">栅格图层</param>
/// <returns></returns>
public static DataTable GetRasterTableByLayer(ILayer layer)
{
ITable iTable = BuildRasterTable(layer);
//ITable iTable = (ITable)layer; //若已存在属性表，直接用该行代码
if (iTable == null)
{
return null;
}
DataTable dataTable = new DataTable();
IFields fields = iTable.Fields;
for (int i = 0; i < fields.FieldCount; i++)
{
dataTable.Columns.Add(fields.Field[i].Name);
}
ICursor pCursor = iTable.Search(null, false);
IRow pRrow = pCursor.NextRow();
while (pRrow != null)
{
DataRow pRow = dataTable.NewRow();
for (int i = 0; i < pRrow.Fields.FieldCount; i++)
{
pRow[i] = pRrow.Value[i].ToString();
}
dataTable.Rows.Add(pRow);
pRrow = pCursor.NextRow();
}
return dataTable;
}