C#开发UG时出错了（不解）

liubo.focus · 发表于 2010-9-11 18:49:57

用C#做的一个EXE程序，重复调用的时候出错了：

不解啊！
一下是源代码：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using NXOpen;
using NXOpen.Utilities;
using NXOpen.UF;
using NXOpenUI;
namespace test1
{
public partial class Form毛坯创建工具 : Form
{
      public Form毛坯创建工具()
      {
         InitializeComponent();
      }
      private string x;
      private string y;
      private string z;

      private void button创建_Click(object sender, EventArgs e)
      {
         Session thesession = Session.GetSession();

         try
         {
            Part thepart = thesession.Parts.Work;
            NXOpen.Features.Feature block = null;
            NXOpen.Features.BlockFeatureBuilder thebuilder = thepart.Features.CreateBlockFeatureBuilder(block);
            x = textBoxX.Text;
            double x1 = Convert.ToDouble(x);
            y = textBoxY.Text;
            double y1 = Convert.ToDouble(y);
            z = textBoxZ.Text;
            double z1 = Convert.ToDouble(z);
            NXOpen.Point3d basepoint = new Point3d(x1, y1, z1);
            thebuilder.SetOriginAndLengths(basepoint ,textBoxΔX.Text ,textBoxΔY .Text ,textBoxΔZ.Text);
            thebuilder.Commit();
            MessageBox.Show("毛坯建造完毕！");
         }
         catch (NXException ex)
         {
            MessageBox.Show("ERROR！");
         }
      }
      private void button退出_Click(object sender, EventArgs e)
      {
         Close();
      }

}
}
请高手多多赐教！