1. arcengine拓扑：叠加分析实现(c#)

直接上demo

using ESRI.ArcGIS.Geoprocessor;
using ESRI.ArcGIS.Geoprocessing;
using ESRI.ArcGIS.DataManagementTools;
using ESRI.ArcGIS.AnalysisTools;
  /// <summary>
        /// 计算fc1叠加fc2分析，并将两个图层间有压盖的两个要素合并为一条记录，存储到outputName，图层间求合并 ---GPToolAPI
        /// </summary>
        /// <param name="fc1"></param>
        /// <param name="fc2"></param>
        /// <param name="outputName"></param>
        /// <param name="tolerance"></param>
        /// <returns></returns>
        public static bool UnionFeatureClass(string fc1, string fc2, string outputName, double tolerance)
        {
            Geoprocessor GP = new Geoprocessor();
            Union pUnion = new Union();
            IGeoProcessorResult result = null;
            try
            {
                pUnion.in_features = fc1 + ";" + fc2;
                pUnion.out_feature_class = outputName;
                pUnion.join_attributes = "ALL";
                if (tolerance != 0)
                    pUnion.cluster_tolerance = tolerance.ToString() + " Meters";

                GP.OverwriteOutput = true;
                GP.TemporaryMapLayers = false;
                result = (IGeoProcessorResult)GP.Execute(pUnion, null);
                object sev = 2;
                string messages = GP.GetMessages(ref sev);
                if (result != null)
                    return true;
                else
                    return false;
            }
            catch
            {
                string str = ReturnMessages(GP);
                return false;
            }
            finally
            {
                if (pUnion != null)
                {

                    pUnion = null;

                }
                if (result != null)
                {

                    result = null;

                }
                if (GP != null)
                {

                    GP = null;

                }
                GC.Collect();
                GC.WaitForFullGCComplete();
            }

            //return GP.Execute(pUnion, null) as IGeoProcessorResult;
        }

2. 处理错误信息

 /// <summary>
        /// 处理错误信息
        /// </summary>
        /// <param name="gp"></param>
        /// <returns></returns>
        private static string ReturnMessages(Geoprocessor gp)
        {
            string ms = "";
            if (gp.MessageCount > 0)
            {
                for (int Count = 0; Count <= gp.MessageCount - 1; Count++)
                {
                    ms += "$" + gp.GetMessage(Count) + "\n\n";
                }
            }

            if (ms.Contains("Succeeded") || ms.Contains("成功"))
            {
                //MarkConfig(true);
                return "";
            }
            return ms;
        }