/// <summary>
/// 删除栅格图层字段（字符串字段）
/// </summary>
/// <param name="rasterLayer">栅格图层</param>
/// <returns></returns>
public static IRasterLayer DeleteRasterStringField(IRasterLayer rasterLayer)
{
if (!IsRasterLayerHaveTable(rasterLayer.Raster))
{
return(rasterLayer);
}
ITable oldTable = (ITable)rasterLayer;
//判断是否存在字符串字段
bool hasString = LayerFieldInfo.IsTableHasFieldType(oldTable, esriFieldType.esriFieldTypeString);
//不需要删除，则返回原始图层
if (!hasString)
{
return(rasterLayer);
}
ILayer copyLayer = RasterLayerCopy.CopyAsTempRasterLayer(rasterLayer.FilePath);
if (copyLayer == null)
{
return(null);
}
//删除字符串类型字段
ILayer layer = DeleteFieldClass.DeleteFieldType(copyLayer, esriFieldType.esriFieldTypeString);
return((IRasterLayer)layer);
}
/// <summary>
/// 添加新字段
/// </summary>
/// <param name="fieldName">字段名称</param>
/// <param name="fieldType">字段类型</param>
public void AddNewFiled(string fieldName, esriFieldType fieldType)
{
ITable iTable = AttributeTableClass.GetITableByLayer(newFieldLayer);
//先删除
DeleteFieldClass.DeleteField(iTable, fieldName);
//再添加
iTable.AddField(NewFieldClass.GetNewFieldEdit(fieldName, fieldType));
AddTableColumn(fieldName, fieldName);
}
/// <summary>
/// 添加多个新字段
/// </summary>
/// <param name="fieldNames"></param>
/// <param name="fieldType">字段类型</param>
public void AddNewFields(List <string> fieldNames, esriFieldType fieldType)
{
ITable iTable = AttributeTableClass.GetITableByLayer(newFieldLayer);
foreach (string fieldName in fieldNames)
{
//先删除
DeleteFieldClass.DeleteField(iTable, fieldName);
//再添加
iTable.AddField(NewFieldClass.GetNewFieldEdit(fieldName, fieldType));
}
AddTableColumns(fieldNames);
}
