/// <summary>
/// 获取字段的唯一值个数
/// </summary>
/// <param name="fieldName"></param>
/// <returns></returns>
public int GetUniqueCountOfField(string fieldName)
{
int uniqueCount;
//有属性表
uniqueCount = RasterTableFunction.IsRasterLayerHaveTable(rasterLayer.Raster)
? GetUniqueCountByTable(rasterLayer, fieldName) : GetFloatValueUniqueCount(rasterLayer);
return(uniqueCount);
}
/// <summary>
/// 判断是否是字符串类型字段
/// </summary>
/// <param name="fieldName">字段名</param>
/// <returns></returns>
public bool IsStringField(string fieldName)
{
//没有属性表则为浮点型，不是字符串类型
if (!RasterTableFunction.IsRasterLayerHaveTable(rasterLayer.Raster))
{
return(false);
}
ITable iTable = (ITable)rasterLayer;
IFields fields = iTable.Fields;
IField field = fields.Field[fields.FindField(fieldName)];
return(field.Type == esriFieldType.esriFieldTypeString);
}
/// <summary>
/// 根据图层获取空间表格
/// </summary>
/// <param name="layer">图层</param>
/// <returns>空间表格</returns>
public static ITable GetITableByLayer(ILayer layer)
{
if (layer == null)
{
return(null);
}
ITable iTable = null;
if (layer is IFeatureLayer)
{
iTable = (ITable)layer;
}
else
{
IRasterLayer rasLayer = layer as IRasterLayer;
//判断是否存在属性表
if (rasLayer != null && RasterTableFunction.IsRasterLayerHaveTable(rasLayer.Raster))
{
iTable = (ITable)layer;
}
}
return(iTable);
}
/// <summary>
/// 是否是浮点数据栅格图层
/// </summary>
/// <returns></returns>
public bool IsFloatRasterLayer()
{
return(!RasterTableFunction.IsRasterLayerHaveTable(rasterLayer.Raster));
}