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利顺业毕求

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应助: 1 (幼儿园)
金币: 26
帖子: 13
在线: 2小时
虫号: 3138432
注册: 2014-04-15
专业: 地理信息系统

[求助] AE求距离函数返回值为0

很简单的一个功能代码如下
IFeatureLayer aFL = axMapControl1.Map.get_Layer(0) as IFeatureLayer;
         IFeatureLayer bFL = axMapControl1.Map.get_Layer(1) as IFeatureLayer;
         IFeatureClass aFClass = aFL.FeatureClass;
         IFeatureCursor aFC = aFClass.Search(null, true);
         IFeature aF = aFC.NextFeature();
         int num = 0;
         while (aF!= null)
         {
            if (Convert.ToInt32(aF.get_Value(aF.Fields.FindField("price"

)) == 0)
            {
                  textBox1.Text = "现在跑" + num + "个栅格";
                  textBox1.Refresh();
                  num++;
                  aF = aFC.NextFeature();
                  continue;
            }
            else
            {
                  IFeatureClass bFClass = bFL.FeatureClass;
                  IQueryFilter bQF = new QueryFilterClass();
                  bQF.WhereClause = "类型 = " + "4";
                  IFeatureCursor bFC = bFClass.Search(bQF, true);
                  IFeature bF = bFC.NextFeature();
                  double minDist = 99999.9;
                  while (bF != null)
                  {
                     IIdentify aI = aFL as IIdentify;
                     IArray aA = aI.Identify(bF.Shape);
                     int idCount = 0;
                     double featureMinDist = 99999.9;
                     while (idCount < aA.Count)
                     {
                        IFeatureIdentifyObj aFIO = aA.get_Element(idCount) as IFeatureIdentifyObj;
                        IRowIdentifyObject aRIO = aFIO as IRowIdentifyObject;
                        IFeature aaF = aRIO.Row as IFeature;
                        IGeometry aG = aF.Shape as IGeometry;
                        IProximityOperator aPO = aG as IProximityOperator;
                        double dist = aPO.ReturnDistance(aaF.Shape as IGeometry);
                        if (dist < featureMinDist)
                        {
                              featureMinDist = dist;
                        }
                        idCount++;
                     }
                     if (featureMinDist < minDist)
                     {
                        minDist = featureMinDist;
                     }
                     bF = bFC.NextFeature();

                  }
                  aF.set_Value(aF.Fields.FindField("ggdist"

, minDist);
                  aF.Store();
                  aF = aFC.NextFeature();
                  textBox1.Text = "现在跑" + num + "个栅格";
                  textBox1.Refresh();
                  num++;
            }
         }
运行的时候报错报错成这样我也不知道怎么调试了求大家懂的帮帮忙啊奇怪的是报错的时候dist变成了0.0 不知道为什么