对于在单个Shp图层上进行要素的选择，并进行闪烁，我想做过AE的同学并不陌生了，这里也不再赘述，
但是当我们想在几个图层间进行选择要素的对比的时候（就看一下空间位置就OK），那么怎么保存这些选择集呢，很简单在每个图层进行选择后，不清空上次的查询结果就OK了，只要不运行IMap::ClearSelection()就OK了，在这同时每个矢量图层离得IselectionSet也都存储了各个图层的被选择要素。
所以这里要是进行整个Map的选择集闪烁的话，就有两种方式了：（1）遍历Map的选择集，（2）遍历每个矢量图层的选择集
我做一个第一种方式的例子：
string ThePath = System.IO.Path.GetDirectoryName(Application.ExecutablePath);
string filename = @"\SpatialAnalyst\小鹿.bmp";
filename = ThePath + filename;
IPictureMarkerSymbol pPicsymbol.CreateMarkerSymbolFromFile(esriIPictureType.esriIPictureBitmap, filename);
pPicsymbol.Size = 16;
ISelection pselection = map_control.Map.FeatureSelection;
IEnumFeature pEnumfeature = pselection as IEnumFeature;
pEnumfeature.Reset();
IFeature pfeature = pEnumfeature.Next();
while (pfeature != null)
{
map_control.FlashShape(pfeature.Shape, 3, 300, pPicsymbol as ISymbol);
pfeature = pEnumfeature.Next();
}
好的，选择集闪烁后，我们要导出所有要素了，一般情况下，我们可能就按照上面同样的方法进行遍历，然后把每个IMap里的选中要素的属性和几何信息进行导出，然后呢，我也这么做到，可是我发现错了，IMap::ClearSelection里的要素是不包含属性的，也就是说他只负责选中与不选中，里面并不包含属性，那怎么办呢，只能遍历每个矢量图层的选择集喽。
代码如下
public void ExportFeature()
{
SaveFileDialog saveDia = new SaveFileDialog();
saveDia.Title = "Export Shp.......";
saveDia.CreatePrompt = false;
saveDia.OverwritePrompt = false;//提示用户是否覆盖
saveDia.Filter = "ShapeFile (*.shp)|*.shp";
saveDia.RestoreDirectory = true;
saveDia.AddExtension = true;//若用户没有添加扩展名，将自行添加
if (saveDia.ShowDialog() == DialogResult.OK)
{
strFullPath = saveDia.FileName;
int Index = strFullPath.LastIndexOf("\\");
filePath = strFullPath.Substring(0, Index);
fileName = strFullPath.Substring(Index + 1);
shapeName = fileName.Remove(fileName.ToLower().LastIndexOf(".shp"), 4);
foreach (FileInfo file in new DirectoryInfo(filePath).GetFiles())
{
if (file.Name == fileName)
{
file.Delete();//如果该Shp文件已经存在，则删除它以及与它相关的文件
FileInfo fileshx = new FileInfo(filePath + "\\" + shapeName + ".shx");
if (fileshx.Exists) fileshx.Delete();
FileInfo fileprj = new FileInfo(filePath + "\\" + shapeName + ".prj");
if (fileprj.Exists) fileprj.Delete();
FileInfo filedbf = new FileInfo(filePath + "\\" + shapeName + ".dbf"); if (filedbf.Exists) filedbf.Delete();
}
}
try
{
IFeatureClass pfeatureClass = ShapeFileClass.CreatNewShapeFile(filePath, fileName);
ITable ptable = pfeatureClass as ITable;
custumeQuetySource custumeQuety = (custumeQuetySource)mapcontrol.CustomProperty;
List<IFeatureLayer> plistLy = custumeQuety.listLyName; //这是我自己写的一个记录曾经参与查询的图层的类
for (int p = 0; p < plistLy.Count; p++)
{
IFeatureLayer pfeatureLy = (IFeatureLayer)plistLy[p];
ISelectionSet pselectionset = ((IFeatureSelection)pfeatureLy).SelectionSet;
if (pselectionset != null)
{
ICursor pCursor = null;
pselectionset.Search(null, false, out pCursor);
IFeatureCursor pfeaturecursor = pCursor as IFeatureCursor;
IFeature pfeature = pfeaturecursor.NextFeature();
while (pfeature != null)
{
IFeatureBuffer pfeaturebuffer = pfeatureClass.CreateFeatureBuffer();
IFeatureCursor pfeatureCursor = pfeatureClass.Insert(true);
pfeaturebuffer.Shape = pfeature.Shape;
for (int i = 2; i < pfeature.Fields.FieldCount; i++)
{ try
{ object shuxing = pfeature.get_Value(i);
pfeaturebuffer.set_Value(i, shuxing);
object shuxin2g = pfeaturebuffer.get_Value(i);
}
catch
{
}
}
pfeatureCursor.InsertFeature(pfeaturebuffer);
pfeatureCursor.Flush();
pfeature = pfeaturecursor.NextFeature();
}
}
}
MessageBox.Show("ShapeFile导出完成");
}
catch (Exception ex)
{
MessageBox.Show("ShapeFile导出失败\n" + ex.Message);
}
}
}
作者： 风云
出处： http://www.cnblogs.com/fengyunlishi/
本文版权归风云和博客园共有，欢迎转载，但未经作者同意必须保留此段声明，且在文章页面明显位置给出原文连接，否则保留追究法律责任的权利.