"未将对象引用设置到对象的实例"是什么原因?

来源：互联网发布：网络小电视浴室电视机编辑：程序博客网时间：2024/06/11 06:56

            if (dataGridView1.Rows.Count != 0)
            {
                saveFileDialog1.Filter = "Execl files (*.xls)|*.xls";
                saveFileDialog1.FilterIndex = 0;
                saveFileDialog1.RestoreDirectory = true;
                saveFileDialog1.CreatePrompt = true;
                saveFileDialog1.Title = "U09D";
                if (saveFileDialog1.ShowDialog() == DialogResult.OK)
                {
                        try
                        {
                          Stream mystream = saveFileDialog1.OpenFile();

                          StreamWriter sw = new StreamWriter(mystream, System.Text.Encoding.GetEncoding(-0));
                          try
                          {
                              string str = "";
                              for (int i = 0; i < dataGridView1.ColumnCount; i++)
                              {
                                  if (i > 0)
                                  {
                                      str += "/t";
                                  }
                                  str += dataGridView1.Columns[i].HeaderText;
                              }
                              sw.WriteLine(str);
                              for (int j = 0; j < dataGridView1.Rows.Count; j++)
                              {
                                  string tempstr = "";
                                  for (int K = 0; K < dataGridView1.Columns.Count; K++)
                                  {
                                      if (K > 0)
                                      {
                                          tempstr += "/t";
                                      }
                                      tempstr += dataGridView1.Rows[j].Cells[K].Value.ToString();
                                  }
                                  sw.WriteLine(tempstr);
                              }
                              sw.Flush();
                              sw.Close();
                              mystream.Close();
                          }
                          catch (Exception ee)
                          {
                              MessageBox.Show(ee.ToString(), "警告");
                          }
                          finally
                          {
                              sw.Flush();
                              sw.Close();
                              mystream.Close();
                          }
                        }
                        catch (Exception ee)
                        {
                            MessageBox.Show(ee.ToString());
                        }
                }

小弟实在看不出以上代码中哪里没实例化T-T