C＃Web应用程序入门经典 学习笔记之一

《Beginning C# Web Applications Wtith Visual Studio .Net 》。

   当前日期：

Lbll.Text = DateTime.Now.ToLongDataString();
This.controls.Add(lbl);

URL:

HyperLink reg = new HyperLink();
Reg.Text = “Register;
Reg.NavigateUrl = Context.Request.ApplicationPath + “Myfirst.aspx”;

判断用户授权:

Context.User.Identity.IsAuthenticated;

表格相关：

1.       新建一图片img
2.       img添加到cell
3.       cell添加到row
4.       row添加到Table
5.       Table添加到PlaceHolder

Table tb = new Table();
TableRow row = new TableRow();
Image img = new Image();
img.ImageUrl = "Images/winbook.gif";
img.ImageAlign = ImageAlign.Middle;
img.Width = new Unit(24, UnitType.Pixel);
img.Height = new Unit(24, UnitType.Pixel);
cell = new TableCell();
cell.Controls.Add(img);
row.Cells.Add(cell);

HyperLink lnk = new HyperLink();
lnk.Text = "News";
lnk.NavigateUrl = "News.aspx";

row.Cells.Add(cell);
tb.Rows.Add(row);
phNav.Controls.Add(tb);

将已验证身份的用户重定向回最初请求的URL

public static void RedirectFromLoginPage(string userName,bool createPersistentCookie);

参数
userName
用于 Cookie 身份验证的用户名称。这不需要映射到帐户名称，并将由 URL 身份验证使用。
createPersistentCookie
指定是否应当发出持久性 Cookie（跨浏览器会话保存的 Cookie）。

标准数据库操作1

String sql;
SqlCommand cmd;
SqlConnection conn;
Sql = “insert into …”;
conn = new SqlConnection (“data source = (local); initial catalog = caoxicao;userid = sa”);
cmd = new SqlCommand (sql,conn);
conn.open();
cmd.ExecuteNonQuery();

标准数据库操作2

SqlConnection conn;
SqlCommand cmd;
SqlDataReader reader;
string sql;
sql = “select * from TableName”;
conn = new SqlConnection (“data source = (local); initial catalog = caoxicao;userid = sa”)
cmd = new SqlCommand(sql,conn);
conn.open();
reader = cmd.ExecuteReader();

可以用reader的Read()方法判断是否真的返回了值

If (reader.Read())
...{
     This.Email.Text = reader[“Email”].ToString();
}

DataSet 基本操作
DataSet dsCaoxicao;
String sql;
SqlConnection conn;
SqlDataAdapter adPlaces;
conn = new SqlConnection (“data source = (local); initial catalog = caoxicao;userid = sa”)
adPlaces = new SqlDataAdapter(sql,conn);
dsCaoxiCao = new DataSet();
conn.Open();
adPlaces.Fill(dsCaoxiCao,”Places”);