密碼輸入三次錯誤後鎖定用戶功能C#源代碼
#region 密碼輸入三次錯誤後鎖定用戶功能
#region 增加錯誤次數的方法
///<summary>
///增加錯誤次數的方法
///</summary>
private void IncErrorTime()
{
string ConnStr = ConfigurationManager.ConnectionStrings["ConnStr"].ConnectionString;
using (SqlConnection conn = new SqlConnection(ConnStr))
{
using (SqlCommand updateCmd = conn.CreateCommand())
{
updateCmd.CommandText = "update T_Admin set errortime=errortime+1 whereUsername=@username";
updateCmd.Parameters.Add(new SqlParameter("username", cmbuserName.Text));
conn.Open();
updateCmd.ExecuteNonQuery();
}
}
}
#endregion
#region 錯誤次數清0
///<summary>
///錯誤次數清0
///</summary>
private void NotErrorTime()
{
string ConnStr = ConfigurationManager.ConnectionStrings["ConnStr"].ConnectionString;
using (SqlConnection conn = new SqlConnection(ConnStr))
{
using (SqlCommand updateCmd = conn.CreateCommand())
{
updateCmd.CommandText = "update T_Admin set errortime=0 whereUsername=@username";
updateCmd.Parameters.Add(new SqlParameter("username", cmbuserName.Text));
conn.Open();
updateCmd.ExecuteNonQuery();
}
}
}
#endregion
#region 密碼錯誤3次,記錄當前時間加30分鐘
///<summary>
///密碼錯誤3次,記錄當前時間加30分鐘
///</summary>
private void IncLoginTime()
{
string ConnStr = ConfigurationManager.ConnectionStrings["ConnStr"].ConnectionString;
using (SqlConnection conn = new SqlConnection(ConnStr))
{
using (SqlCommand updateCmd = conn.CreateCommand())
{
updateCmd.CommandText = "update T_Admin set logintime=@logintime whereUsername=@username";
DateTime logintime = DateTime.Now.AddMinutes(30);
updateCmd.Parameters.Add(new SqlParameter("username", cmbuserName.Text));
updateCmd.Parameters.Add(new SqlParameter("logintime", logintime.ToString()));
conn.Open();
updateCmd.ExecuteNonQuery();
}
}
}
#endregion
#region 按鈕事件判斷用戶登錄3次失效後鎖定用戶30分鐘
private void BtnClike()
{
string username = cmbuserName.Text;
string password = txtPwd.Text;
string ConnStr = ConfigurationManager.ConnectionStrings["ConnStr"].ConnectionString;
using (SqlConnection conn = new SqlConnection(ConnStr))
{
using (SqlCommand cmd = conn.CreateCommand())
{
cmd.CommandText = "select * from T_Admin whereusername=@username";
cmd.Parameters.Add(new SqlParameter("username", username));
conn.Open();
using (SqlDataReader reader = cmd.ExecuteReader())
{
if (reader.Read())
{
//用戶存在
string dbpassword = reader.GetString(reader.GetOrdinal("password"));
DateTime logintime = reader.GetDateTime(reader.GetOrdinal("logintime"));
//判斷當前時間是是服務器允許登錄時間
if (logintime > DateTime.Now)
{
MessageBox.Show("一定時間內禁止登錄");
return;
}
//如果密碼正確
if (dbpassword == txtPwd.Text)
{
NotErrorTime();
MessageBox.Show("登錄成功!");
}
//如果密碼錯誤
else
{
int errortime = reader.GetInt32(reader.GetOrdinal("errortime"));
if (errortime >= 2)
{
MessageBox.Show("密碼錯誤次數太多!");
IncLoginTime();
NotErrorTime();
return;
}
MessageBox.Show("密碼錯誤!");
IncErrorTime();//密碼錯誤,次數加1
}
}
else//用戶名不存在
{
MessageBox.Show("用戶名不存在!");
return;
}
}
}
}
}
#endregion
#endregion
#region 增加錯誤次數的方法
///<summary>
///增加錯誤次數的方法
///</summary>
private void IncErrorTime()
{
string ConnStr = ConfigurationManager.ConnectionStrings["ConnStr"].ConnectionString;
using (SqlConnection conn = new SqlConnection(ConnStr))
{
using (SqlCommand updateCmd = conn.CreateCommand())
{
updateCmd.CommandText = "update T_Admin set errortime=errortime+1 whereUsername=@username";
updateCmd.Parameters.Add(new SqlParameter("username", cmbuserName.Text));
conn.Open();
updateCmd.ExecuteNonQuery();
}
}
}
#endregion
#region 錯誤次數清0
///<summary>
///錯誤次數清0
///</summary>
private void NotErrorTime()
{
string ConnStr = ConfigurationManager.ConnectionStrings["ConnStr"].ConnectionString;
using (SqlConnection conn = new SqlConnection(ConnStr))
{
using (SqlCommand updateCmd = conn.CreateCommand())
{
updateCmd.CommandText = "update T_Admin set errortime=0 whereUsername=@username";
updateCmd.Parameters.Add(new SqlParameter("username", cmbuserName.Text));
conn.Open();
updateCmd.ExecuteNonQuery();
}
}
}
#endregion
#region 密碼錯誤3次,記錄當前時間加30分鐘
///<summary>
///密碼錯誤3次,記錄當前時間加30分鐘
///</summary>
private void IncLoginTime()
{
string ConnStr = ConfigurationManager.ConnectionStrings["ConnStr"].ConnectionString;
using (SqlConnection conn = new SqlConnection(ConnStr))
{
using (SqlCommand updateCmd = conn.CreateCommand())
{
updateCmd.CommandText = "update T_Admin set logintime=@logintime whereUsername=@username";
DateTime logintime = DateTime.Now.AddMinutes(30);
updateCmd.Parameters.Add(new SqlParameter("username", cmbuserName.Text));
updateCmd.Parameters.Add(new SqlParameter("logintime", logintime.ToString()));
conn.Open();
updateCmd.ExecuteNonQuery();
}
}
}
#endregion
#region 按鈕事件判斷用戶登錄3次失效後鎖定用戶30分鐘
private void BtnClike()
{
string username = cmbuserName.Text;
string password = txtPwd.Text;
string ConnStr = ConfigurationManager.ConnectionStrings["ConnStr"].ConnectionString;
using (SqlConnection conn = new SqlConnection(ConnStr))
{
using (SqlCommand cmd = conn.CreateCommand())
{
cmd.CommandText = "select * from T_Admin whereusername=@username";
cmd.Parameters.Add(new SqlParameter("username", username));
conn.Open();
using (SqlDataReader reader = cmd.ExecuteReader())
{
if (reader.Read())
{
//用戶存在
string dbpassword = reader.GetString(reader.GetOrdinal("password"));
DateTime logintime = reader.GetDateTime(reader.GetOrdinal("logintime"));
//判斷當前時間是是服務器允許登錄時間
if (logintime > DateTime.Now)
{
MessageBox.Show("一定時間內禁止登錄");
return;
}
//如果密碼正確
if (dbpassword == txtPwd.Text)
{
NotErrorTime();
MessageBox.Show("登錄成功!");
}
//如果密碼錯誤
else
{
int errortime = reader.GetInt32(reader.GetOrdinal("errortime"));
if (errortime >= 2)
{
MessageBox.Show("密碼錯誤次數太多!");
IncLoginTime();
NotErrorTime();
return;
}
MessageBox.Show("密碼錯誤!");
IncErrorTime();//密碼錯誤,次數加1
}
}
else//用戶名不存在
{
MessageBox.Show("用戶名不存在!");
return;
}
}
}
}
}
#endregion
#endregion
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