void initContracts()
{
//如果存在Student.xml查询所有学生信息，如果不存在，则创建后在查询
if (File.Exists(AppDomain.CurrentDomain.SetupInformation.ApplicationBase + @"/xml/Student.xml"))
{
dataGridView1.DataSource = StudentInfoBLL.GetAllStudentInfo();
}
else
{
StudentInfoBLL.CreateStudentXml();
dataGridView1.DataSource = StudentInfoBLL.GetAllStudentInfo();
}
//初始化数据表格dataGitlView的列标题
dataGridView1.Columns[0].HeaderText = "学生编号";
dataGridView1.Columns[1].HeaderText = "学生姓名";
dataGridView1.Columns[2].HeaderText = "学生性别";
dataGridView1.Columns[3].HeaderText = "学生年龄";
dataGridView1.Columns[4].HeaderText = "出生日期";
dataGridView1.Columns[5].HeaderText = "手机号码";
dataGridView1.Columns[6].HeaderText = "家庭住址";
dataGridView1.Columns[7].HeaderText = "电子邮箱";
dataGridView1.Columns[8].HeaderText = "专 业";
}