/// <summary>
/// 删除图层
/// </summary>
/// <param name="host">数据库对象</param>
/// <param name="layerNmaes">图层名称</param>
public static void DelectLayer(this TransactionHost host, params string[] layerNmaes)
{
using (var layerTable = host.GetObject <LayerTable>(host.Database.LayerTableId))
{
foreach (var name in layerNmaes)
{
if (layerTable.Has(name))
{
var layerID = layerTable[name];
if (layerID != host.Database.Clayer)
{
layerTable.GenerateUsageData();
var layer = host.GetObject <LayerTableRecord>(layerID);
if (!layer.IsUsed)
{
if (!layer.IsWriteEnabled)
{
layer.UpgradeOpen();
}
layer.Erase(true);
}
}
}
}
host.Commit();
}
}
/// <summary>
/// 将图层设置为当前图像
/// </summary>
/// <param name="host">封装事务对象</param>
/// <param name="layerName">图层名称</param>
public static void SetCurrentLayer(this TransactionHost host, string layerName)
{
using (var layerTable = host.GetObject <LayerTable>(host.Database.LayerTableId))
{
if (layerTable.Has(layerName))
{
var layer = host.GetObject <LayerTableRecord>(layerTable[layerName]);
if (layer.IsWriteEnabled)
{
layer.DowngradeOpen();
host.Database.Clayer = layer.ObjectId;
}
else
{
host.Database.Clayer = layerTable[layerName];
}
}
host.Commit();
}
}
/// <summary>
/// 添加图层
/// </summary>
/// <param name="host">封住事务对象</param>
/// <param name="layers">图层</param>
/// <returns>返回添加图层的ID集合</returns>
public static List <ObjectId> AddLayer(this TransactionHost host, IDictionary <string, short> layers)
{
var objectIds = new List <ObjectId>();
using (var layerTable = host.GetObject <LayerTable>(host.Database.LayerTableId))
{
foreach (KeyValuePair <string, short> layer in layers)
{
if (!layerTable.Has(layer.Key))
{
var newLayer = new LayerTableRecord()
{
Name = layer.Key,
Color = Color.FromColorIndex(ColorMethod.ByAci, layer.Value)
};
var a1 = layerTable.IsReadEnabled;
if (!layerTable.IsWriteEnabled)
{
layerTable.UpgradeOpen();
var c1 = layerTable.IsWriteEnabled;
}
objectIds.Add(layerTable.Add(newLayer));
host.UpdateDBObject(newLayer);
}
}
host.Commit();
}
return(objectIds);
}
