/// <summary>
/// 将线要素切割
/// </summary>
/// <param name="pFeature">被切割的线要素</param>
/// <param name="pPoint">切割点</param>
/// <returns>切割后的线要素</returns>
public static IFeature SplitPolyLine(IFeature pFeature, IPoint pPoint)
{
IGeometry pGeometry = pFeature.Shape;
if (((IPolyline)pGeometry).FromPoint.X == pPoint.X && ((IPolyline)pGeometry).FromPoint.Y == pPoint.Y)
{
return(pFeature);
}
if (((IPolyline)pGeometry).ToPoint.X == pPoint.X && ((IPolyline)pGeometry).ToPoint.Y == pPoint.Y)
{
return(pFeature);
}
try
{
IWorkspaceEdit pEditor = GeoDbUtils.InitWorkspace() as IWorkspaceEdit;
pEditor.StartEditOperation();
IFeatureEdit pEditFeature = pFeature as IFeatureEdit;
ISet pSet = pEditFeature.Split(pPoint);
pSet.Reset();
IFeature pRetFeature = pSet.Next() as IFeature;
pGeometry = pRetFeature.Shape;
if (((IPointCollection)(IPolyline)pGeometry).PointCount == 2)
{
pRetFeature = pSet.Next() as IFeature;
}
pEditor.StopEditOperation();
return(pRetFeature);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
return(null);
}
}
/// <summary>
/// 根据指定要素获取要素对应的图层的全部标志字段和标志值
/// </summary>
/// <param name="pFeature">要素</param>
/// <param name="sArrField">全部标志字段</param>
/// <param name="nArrValue">全部标志值</param>
/// <returns>是否存在分层字段</returns>
public static bool GetUniqueFieldValue(IFeature pFeature, out string[] sArrField, out string[] nArrValue)
{
IFeatureLayer pfLayer = GeoDbUtils.GetFeatureLayer(pFeature);
if (pfLayer != null && GetUniqueFields(pfLayer, out sArrField) == true)
{
if (sArrField != null && sArrField.Length > 0)
{
nArrValue = new string[sArrField.Length];
for (int i = 0; i < sArrField.Length; i++)
{
object o = GeoDbUtils.GetFieldValue(pFeature, sArrField[i]);
if (o == null)
{
nArrValue[i] = "0";
}
else
{
nArrValue[i] = o.ToString();
}
}
return(true);
}
}
sArrField = null;
nArrValue = null;
return(false);
}
/// <summary>
/// 设置指定要素的标志值
/// </summary>
/// <param name="pFeature">要素</param>
/// <param name="arrsField">标志字段</param>
/// <param name="sValue">标志值（分隔符为','）</param>
public static void SetUniqueValue(IFeature pFeature, string[] arrsField, string sValue)
{
int nField = arrsField.Length;
if (nField > 0)
{
string[] arrsValue = sValue.Split(',');
for (int i = 0; i < nField; i++)
{
GeoDbUtils.SetFieldValue(pFeature, arrsField[i], arrsValue[i]);
}
pFeature.Store();
}
}
/// <summary>
/// 判断给定标志值(e.g. 1,0)是否属于要素对应图层的标志值
/// </summary>
/// <param name="pFeature">要素</param>
/// <param name="sValue">标志值</param>
/// <returns>是否属于</returns>
public static bool UniueValueEqual(IFeature pFeature, string sValue)
{
IFeatureLayer pfLayer = GeoDbUtils.GetFeatureLayer(pFeature);
IGeoFeatureLayer pGeoFLayer = pfLayer as IGeoFeatureLayer;
IFeatureRenderer pfRenderer = pGeoFLayer.Renderer;
string[] arrsField = null;
if (GetUniqueFields(pfLayer, out arrsField) && arrsField != null)
{
string[] arrsValue = sValue.Split(',');
int nField = arrsField.Length;
string sFieldValue = null;
for (int i = 0; i < nField; i++)
{
GeoDbUtils.GetFieldValue(pFeature, arrsField[i], ref sFieldValue);
if (sFieldValue != arrsValue[i])
{
return(false);
}
}
}
return(true);
}