#region 激活或创建用户管理层面bool isExit = false;foreach (Form childFrm in this.MdiParent.MdiChildren){//用子窗体的Name进行判断，如果已经存在则将他激活if (childFrm.Name == "Form_UserManage"){if (childFrm.WindowState == FormWindowState.Minimized)childFrm.WindowState = FormWindowState.Normal;childFrm.Activate();isExit = true;}}if (isExit == false){// 如果该窗体不存在则新生成一个库存查询窗体Form_UserManage newFrm = new Form_UserManage();newFrm.MdiParent = this.MdiParent;newFrm.Show();}this.Close();#endregion

DialogResult RSS = MessageBox.Show(this,"确定要删除选中行数据码？","提示",MessageBoxButtons.YesNo,MessageBoxIcon.Warning);
switch(RSS)
{
case DialogResult.Yes:
for (int i = this.dataGridView1.SelectedRows.Count; i > 0; i--)
{
int ID = Convert.ToInt32(dataGridView1.SelectedRows[i - 1].Cells[0].Value);
dataGridView1.Rows.RemoveAt(dataGridView1.SelectedRows[i - 1].Index);
//使用获得的ID删除数据库的数据
string SQL = "delete from UserInfo where UserId='"+ID.ToString()+"'";
int s =Convert.ToInt32(cl.Execute(SQL)); //cl是操作类的一个对像，Execute()是类中的一个方法
if (s!=0)
{
MessageBox.Show("成功删除选中行数据！");
}
}
break;
case DialogResult.No:
break;
}

  #region 删除选中的行string buttonText = this.dgv_AllUsers.Rows[e.RowIndex].Cells[e.ColumnIndex].Value.ToString();//int CIndex = e.ColumnIndex;//按钮所在列为第五列，列下标从0开始的  if (buttonText == "删除"){//获取在同一行第一列的单元格中的字段值  string _UID =this.dgv_AllUsers[0, e.RowIndex].Value.ToString();string _Uname = this.dgv_AllUsers[1, e.RowIndex].Value.ToString();//MessageBox.Show(_UID.ToString());DialogResult RSS = MessageBox.Show(this, "确定要删除选中行( ID为" + _UID + "：,名称为：" + _Uname + " )的数据码？", "提示", MessageBoxButtons.YesNo, MessageBoxIcon.Warning);switch (RSS){case DialogResult.Yes:jinlongDLL.DBHelper db = new DBHelper();string SQL = "delete from users where id='" + _UID + "';";int s = db.ExecuteSql(SQL);if (s != 0){MessageBox.Show("成功删除选中行数据！");}dgv_AllUsers_Init();//载入用户数据break;case DialogResult.No:break;}}#endregion