基本控件：
ｌａｂｅｌ（標簽控件）
主要屬性：Image（在標簽上顯示的圖像）
Text（在標簽上顯示的文本）
TextBox（文本框控件）
主要屬性：PasswordChar(指示在作為密碼框時，文本框中顯示的字符，而不是實際輸入的文本)
Button（按鈕控件）
ComboBox（下拉框）屬性：SelectedItem：獲取當前選定的項
事件：Click（單擊控件時發生）
private void butStyle_Click(object sender, EventArgs e)
{
string str = "Data source=.;Initial catalog=Myschool;uid=sa";
SqlConnection con = new SqlConnection(str);
string sql = "select count(1) from student where studentName='" + txtUserName.Text + "' and LoginPwd='" + txtPwd.Text + "'";
SqlCommand cmd = new SqlCommand(sql, con);
try
{
con.Open();
int count = Convert.ToInt32(cmd.ExecuteScalar());
if (count > 0)
{
MessageBox.Show("登陸成功");
this.Hide();
FormMain frm = new FormMain();
frm.Show();
}
}
catch (Exception)
{
MessageBox.Show("退出");
}
finally
{
con.Close();
}
Sender是事件源，表示發生了這個事件的對象，事件發生中，事件源就是按鈕。
e是事件參數（EventArgs）對象，不同的事件會有不同的參數。
Close（）方法是窗體類Form的一個方法，作用是關閉窗體。
01.給菜單欄中的“新增學生”菜單項添加事件處理程序，代碼如下
private void 新增學生ToolStripMenuItem_Click(object sender, EventArgs e)
{
FormStudent formStudent = new FormStudent();
formStudent.Show();
}
02.添加學生信息
public void Save()
{
//添加學生
string pwd = txtpwd.Text;
string stuname = textname.Text;
//性別
string stugender = string.Empty;
if (radioman.Checked)
{
stugender = "1";
}
else
{
stugender = "0";
}
//下拉框綁定數據
int gid = GeadIdName();
//聯系電話
string StuPhone = textphone.Text;
//地址
string StuAddress = textAddress.Text;
//日期
DateTime dt = dateBirthday.Value;
//郵箱
string StuEmail = textEmail.Text;
//LoginPwd, StudentName, Gender, GradeId, Phone, Address, Birthday, Email
string sql = "insert into Student values('" + pwd + "','" + stuname + "','" + stugender + "'," + gid + ",'" + StuPhone + "','" + StuAddress + "','" + dt + "','" + StuEmail + "')";
string str = "Data source=.;Initial catalog=Myschool;uid=sa;";
SqlConnection con = new SqlConnection(str);
SqlCommand cmd = new SqlCommand(sql, con);
con.Open();
int count = cmd.ExecuteNonQuery();
if (count > 0)
{
MessageBox.Show("添加成功");
}
con.Close();
}
//查詢學生信息
public void LodaDataListView(string sql)
{
string str = "data source=.;initial catalog=Myschool;uid=sa;";
SqlConnection con = new SqlConnection(str);
SqlCommand cmd = new SqlCommand(sql, con);
try
{
con.Open();
SqlDataReader dr = cmd.ExecuteReader();
if (dr != null)
{
if (dr.HasRows)
{
while (dr.Read())
{
int stuNo = Convert.ToInt32(dr["studentNo"]);
//姓名
string stuname = Convert.ToString(dr["studentName"]);
//性別
string stuGender = Convert.ToString(dr["Gender"]);
//年級名次
string stuGname = Convert.ToString(dr["Gradename"]);
ListViewItem LvItem = new ListViewItem(stuNo.ToString());
LvItem.SubItems.Add(stuname);
LvItem.SubItems.Add(stuGender);
LvItem.SubItems.Add(stuGname);
//讓lvItem和ListView關聯
lvlist.Items.Add(LvItem);
}
dr.Close();
}
}
}
catch (Exception)
{
throw;
}
finally
{
con.Close();
}
//窗體Load的事件中調用
private void Formselect_Load(object sender, EventArgs e)
{
string sql = "select StudentNO,StudentName,Gender,GradeName from Student,Grade where Student.GradeId=Grade.GradeId";
LodaDataListView(sql);
}
修改學生信息
public void upatae()
{
//添加學生
string pwd = txtpwd.Text;
string stuname = textname.Text;
//性別
string stugender = string.Empty;
if (radioman.Checked)
{
stugender = "1";
}
else
{
stugender = "0";
}
//下拉框綁定數據
int gid = GeadIdName();
//聯系電話
string StuPhone = textphone.Text;
//地址
string StuAddress = textAddress.Text;
//日期
DateTime dt = dateBirthday.Value;
//郵箱
string StuEmail = textEmail.Text;
//LoginPwd, StudentName, Gender, GradeId, Phone, Address, Birthday, Email
string sql = @"update Student set StudentName='" + stuname + "',Gender=" + stugender + ",GradeId='" + gid + "',phone='" + StuPhone + "',Address='" + StuAddress + "',Birthday='" + dt + "',Email='" + StuEmail
+ "' where studentNo='" + textNo.Text + "'";
string str = "Data source=.;Initial catalog=Myschool;uid=sa;";
SqlConnection con = new SqlConnection(str);
SqlCommand cmd = new SqlCommand(sql, con);
con.Open();
int count = cmd.ExecuteNonQuery();
if (count > 0)
{
frmselect.selectData();
MessageBox.Show("修改成功");
}
con.Close();
}
//性別if判定:性別男為1 為女0.
