C#窗口航空总结

public string con = "Data Source=.;Initial Catalog=ticket;Integrated Security=True";//连接数据库语句
private void Form1_Load(object sender, EventArgs e)
{
SqlConnection conn = new SqlConnection(con);//连接数据库

string sql = "select * from CityInfo";//sql语句

SqlCommand cmd = new SqlCommand(sql, conn);

SqlDataAdapter da = new SqlDataAdapter();//卡车对象
da.SelectCommand = cmd;
DataSet ds = new DataSet();//建立两个临时数据表
da.Fill(ds, "CityInfo");
da.Fill(ds, "CityInfo2");

//向数据集第一行添加数据"请选择"
DataRow row = ds.Tables["CityInfo"].NewRow();
row["Id"] = -1;
row["CityName"] = "请选择";
ds.Tables["CityInfo"].Rows.InsertAt(row, 0);

DataRow row1 = ds.Tables["CityInfo2"].NewRow();
row1["Id"] = -1;
row1["CityName"] = "请选择";
ds.Tables["CityInfo2"].Rows.InsertAt(row1, 0);

//向下拉框填充数据
this.comboBox1.DataSource = ds.Tables["CityInfo"];
this.comboBox1.ValueMember = "Id";
this.comboBox1.DisplayMember = "CityName";

this.comboBox2.DataSource = ds.Tables["CityInfo2"];
this.comboBox2.ValueMember = "Id";
this.comboBox2.DisplayMember = "CityName";

}

private void but1_Click(object sender, EventArgs e)
{

int go = Convert.ToInt32(comboBox1.SelectedValue);//接受下拉框的值
int qu = Convert.ToInt32(comboBox2.SelectedValue);
string str = "Data Source=.;Initial Catalog=Ticket;Integrated Security=True";//连接数据库语句
string sql = " select f.FlightNo,a.Airways ,f.LeaveTime,f.LandTime,f.Price from AirwaysInfo as a,FlightInfo as f where a.Id=f.AirwaysId and LeaveCity=‘" + go + "‘ and Destination=‘" + qu + "‘";//连表查询语句
SqlConnection conn = new SqlConnection(str);
SqlDataAdapter da = new SqlDataAdapter(sql, conn);
DataSet ds = new DataSet();
da.Fill(ds, "aa");//保存在临时数据表
dgv1.DataSource = ds.Tables["aa"];

}

private void dgv1_CellMouseClick(object sender, DataGridViewCellMouseEventArgs e)
{

//获取数据库中的值，赋给变量
string no = dgv1.SelectedRows[0].Cells[0].Value.ToString();
string hangban = dgv1.SelectedRows[0].Cells[1].Value.ToString();
string chu = Convert.ToString(dgv1.SelectedRows[0].Cells[2].Value);
string mudidi = dgv1.SelectedRows[0].Cells[3].Value.ToString();
int piaojia = Convert.ToInt32(dgv1.SelectedRows[0].Cells[4].Value);
txt1.Text = no;//航班号
txt5.Text = hangban;//航班公司
txt2.Text = comboBox1.Text;//出发地
txt6.Text = comboBox2.Text;//目的地
txt3.Text = Convert.ToString(chu);//出发时间
txt7.Text = mudidi;//到达时间
txt4.Text = piaojia.ToString();//成人票价

}

private void but2_Click(object sender, EventArgs e)
{
SqlConnection conn = new SqlConnection(con);
string date = dtp1.Value.ToString();//时间控件转字符串
conn.Open();
Random rd = new Random();
int num1 = rd.Next(10000, 10000000);//随机数
string sql =@"insert into OrderInfo ([OrderId],[FlightNo],
[LeaveDate],[Number])values(‘" + num1 + "‘,‘" + txt1.Text + "‘,‘" + date + "‘,‘" + nup1.Text + "‘)";
try
{

if (txt1.Text==string.Empty)//判断是否有航班
{
MessageBox.Show("请选择一个航班！");
}
else
{

if (DateTime.Now {
SqlCommand cmd = new SqlCommand(sql, conn);
int num = cmd.ExecuteNonQuery();
if (num > 0)
{
MessageBox.Show("增加‘" + nup1.Text + "‘张成功!");
}
else
{
MessageBox.Show("增加失败！");
}
}
else {
MessageBox.Show("时间格式不对！");
}

}
}
catch (Exception ex)
{

MessageBox.Show("异常！"+ex, "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
finally
{
conn.Close();
}

}

private void but3_Click(object sender, EventArgs e)
{
DialogResult result = MessageBox.Show("确定退出吗！！", "提示", MessageBoxButtons.YesNo, MessageBoxIcon.Information);
if (result == DialogResult.Yes)
{
this.Close();
}
}

做项目啊，还是应该熟悉所有的知识！书到用时方恨少！

好好学习，天天向上！