public void supportUndo()
{
    UID editorUID= new UIDClass();
    editorUID.Value = "esriEditor.Editor";
    IMxApplication mxApplication = new ArcMap.ThisApplication;
    IApplication application = mxApplication as IApplication;
    IEidtor pEditor = application.FindExtensionByCLSID(editorID) as IEidtor;
    IEditorLayers pEditorLayer = pEditor as IEditorLayers;
    if(pEditor.EditState != esriEditState.esriStateEditing)
    {
        MessageBox("先打开编辑器");
        return;
    }
    IActiveView pActiveView = ArcMap.Document.FocusMap as IActiveView;
    pEditor.StartOperation();
    //-------------------------------------------------------
    // 绘制街区，标记删除点房，道路GB修改等操作
    //-------------------------------------------------------
    pEditor.StopOperation("Edit Finshed");
}

public void ExplodeMultipart(IFeatureClass ExFeature)
        {
            IFeatureCursor mFeatureCursor = ExFeature.Update(null, false);
            IFeature mFeature = mFeatureCursor.NextFeature();
            IWorkspace del_workspace = (ExFeature as IDataset).Workspace;
            IWorkspaceEdit del_workspaceedit = del_workspace as IWorkspaceEdit;
            if (del_workspaceedit.IsBeingEdited() == true)
                del_workspaceedit.StopEditing(true);
            del_workspaceedit.StartEditing(false);
            del_workspaceedit.StartEditOperation();
            while (mFeature != null)
            {
                IGeometryCollection mGeometryCol = mFeature.ShapeCopy as IGeometryCollection;
                int mGeoCount = mGeometryCol.GeometryCount;
                int idRemark = -1;
                if (mGeoCount > 1)
                {
                    idRemark = int.Parse(mFeature.get_Value(0).ToString());
                    for (int index = 0; index < mGeoCount; index++)
                    {
                        IFeature mNewFeature =
                            (mFeature.Class as IFeatureClass).CreateFeature();
                        IFeatureEdit mFeatureEdit = mFeature as IFeatureEdit;
                        mFeatureEdit.SplitAttributes(mNewFeature);
                        IGeometry mGeoNew = mGeometryCol.get_Geometry(index);
                        mGeoNew.SpatialReference = mFeature.Shape.SpatialReference;
                        IGeometryCollection mGCollection = new PolygonClass();
                        mGCollection.AddGeometry(mGeoNew);
                        mNewFeature.Shape = mGCollection as IGeometry;
                        mNewFeature.Store();
                    }
                }
                if (idRemark != -1)
                {
                    mFeatureCursor.DeleteFeature();
                    idRemark = -1;
                }
                mFeature = mFeatureCursor.NextFeature();
            }
            del_workspaceedit.StopEditOperation();
            del_workspaceedit.StopEditing(true);
        }

# Name: MultipartToSinglepart_Example2.py
# Description: Break all multipart features into singlepart features,
#              and report which features were separated.
# Import system modules
import arcpy
# Create variables for the input and output feature classes
inFeatureClass = "c:/data/gdb.gdb/vegetation"
outFeatureClass = "c:/data/gdb.gdb/vegetation_singlepart"
try:
    # Create list of all fields in inFeatureClass
    fieldNameList = [field.name for field in arcpy.ListFields(inFeatureClass)]
    # Add a field to the input this will be used as a unique identifier
    arcpy.AddField_management(inFeatureClass, "tmpUID", "double")
    # Determine what the name of the Object ID is 
    OIDFieldName = arcpy.Describe(inFeatureClass).OIDFieldName
    # Calculate the tmpUID to the OID
    arcpy.CalculateField_management(inFeatureClass, "tmpUID",
                                    "!" + OIDFieldName + "!", "PYTHON")
    # Run the tool to create a new fc with only singlepart features
    arcpy.MultipartToSinglepart_management(inFeatureClass, outFeatureClass)
    # Check if there is a different number of features in the output
    #   than there was in the input
    inCount = int(arcpy.GetCount_management(inFeatureClass).getOutput(0))
    outCount = int(arcpy.GetCount_management(outFeatureClass).getOutput(0))
    if inCount != outCount:
        # If there is a difference, print out the FID of the input 
        #   features which were multipart
        arcpy.Frequency_analysis(outFeatureClass,
                                 outFeatureClass + "_freq", "tmpUID")
        # Use a search cursor to go through the table, and print the tmpUID 
        print("Multipart features from {0}".format(inFeatureClass))
        for row in arcpy.da.SearchCursor(outFeatureClass + "_freq",
                                         ["tmpUID"], "FREQUENCY > 1"):
            print(int(row[0]))
    else:
        print("No multipart features were found")
except arcpy.ExecuteError:
    print(arcpy.GetMessages())
except Exception as err:
    print(err.args[0])