ASP.NET学习小结

0.一些程式短语：
  string fdwmc=TextBox1.text.trim();

  ArrayList value=new ArrayList();
  value.Add("aaa");
  value.Add("bbb");

  Hashtable h=new Hashtable();
  h.Add("a1","a2");
  h.Add("b1","b2");
 
  StringBuilder s3 = new StringBuilder();
  s3.Append("hello");
  s3.Append(" world");
  s3.Append(" !!!");

00.HTML短语：
   <p> 则是代表段落标注
   <br>断行标注,，这个标注不需要再写一个对映的 </br>
   <font>标注：本标注用来设定文字的大小、颜色、字体
   <b> 粗体、<i> 斜体及 <u> 底线标注
   <h1>～<h6> 标题标注
   <blockquote>缩排标示
   <ol> 条列标注：(显数字)
   <ul>条列标注：(显。)
   <div> 段落对齐标注
   <!-- 这是批注, 给开发人员看的, 不会被解译 -->
   <table> 标注用来表示表格的开始及结束
   <tr> 则表示其中行的开始及结束
   <td> 则表示一行中的字段
   <img src="Train.jpg">显视图形
   <a href="H10.htm>...</a><br>超级联接

1.DataGrid自定义字段.
  <Column
    <asp:BoundColumn DataField="khbh" HeaderText="客户编号"></asp:BoundColumn>
    <asp:BoundColumn DataField="khjc" HeaderText="客户简称"><ItemStyle BackColor="#CCFFFF"></ItemStyle></asp:BoundColumn>
    <asp:BoundColumn DataField="dh" HeaderText="电话"></asp:BoundColumn>
    <asp:BoundColumn DataField="cjri" HeaderText="创建日期" DataFormatString="{0:yyyy-MM-dd}"></asp:BoundColumn>
    <asp:BoundColumn DataField="bycgl" HeaderText="月均出柜量"></asp:BoundColumn>
    <asp:EditCommandColumn ButtonType="LinkButton" UpdateText="更新" CancelText="取消" EditText="编辑">
 <ItemStyle Font-Names="楷体_GB2312" Wrap="False" ForeColor="#339966"></ItemStyle>
 </asp:EditCommandColumn>
    <asp:ButtonColumn Text="删除" CommandName="Delete"><ItemStyle Font-Names="楷体_GB2312" Wrap="False" ForeColor="#339966"></ItemStyle>
 </asp:ButtonColumn>
  </Columns>
  (DataGrid1.AutoGenerateColumns=False)

2.按一个控件后出一提示框选择是否执行.
  private void Page_Load(object sender, System.EventArgs e)
  {
 // 在此处放置用户代码以初始化页面
 Button1.Attributes["onClick"]="javascript:return confirm('确定吗?');";

  }

3.一般提示框.
  private void Button1_Click(object sender, System.EventArgs e)
  {
      Response.Write("<script language='javascript'>alert('hellow');</script>");
  }

4.一般的DataGrid显视数据过程:
  SqlConnection SqlConn;
  DataSet objDataSet=new DataSet();
  string Connstr="server=bserver;user=sa;database=SFA";
  string SQLstr="select * from khxx";
  SqlConn=new SqlConnection(Connstr);
  SqlDataAdapter objAdapter=new SqlDataAdapter(SQLstr,SqlConn);
  objAdapter.Fill(objDataSet,"khxx");
  DataGrid1.DataSource=objDataSet.Tables["khxx"].DefaultView;
  DataGrid1.DataBind();

5.在Web.config里设好连接数据库的字符串.
  //web.config
  </system.web>
   <appSettings>
     <add key="strConn" value="server=bserver;database=SFA;user=sa;"/>
   </appSettings>
  </configuration>
  //WebForm1.aspx
  using System.Configuration;
  string Connstr=ConfigurationSettings.AppSettings["strConn"];

6.分页显视数据:
  private void DataGrid1_PageIndexChanged(object source, System.Web.UI.WebControls.DataGridPageChangedEventArgs e)
  {
      DataGrid1.CurrentPageIndex=e.NewPageIndex;
      BindGrid();
  }

7.统一显视数据函数:
  public void BindGrid()
  {
      SqlConnection SqlConn;
      DataSet objDataSet=new DataSet();
      string Connstr=ConfigurationSettings.AppSettings["strConn"];
      string SQLstr="select * from khxx";
      SqlConn=new SqlConnection(Connstr);
      SqlDataAdapter objAdapter=new SqlDataAdapter(SQLstr,SqlConn);
      objAdapter.Fill(objDataSet,"khxx");
      DataGrid1.DataSource=objDataSet.Tables["khxx"].DefaultView;
      DataGrid1.DataBind();
  }

回复：
8.DataGrid数据编辑处理(一)_直接编辑
  private void DataGrid1_EditCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
  {
 DataGrid1.EditItemIndex=(int)e.Item.ItemIndex;
 BindGrid();
  }

  private void DataGrid1_CancelCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
  {
 DataGrid1.EditItemIndex=-1;
 BindGrid();
  }

  private void DataGrid1_UpdateCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
  {
     DataGrid1.EditItemIndex=-1; 
   
     SqlConnection SqlConn;
     DataSet objDataSet=new DataSet();
     string Connstr=ConfigurationSettings.AppSettings["strConn"];
     string SQLstr="select * from khxx";
     SqlConn=new SqlConnection(Connstr);
     SqlDataAdapter objAdapter=new SqlDataAdapter(SQLstr,SqlConn);
     objAdapter.Fill(objDataSet,"khxx");

     TextBox CurrentText;
     CurrentText = (TextBox)e.Item.Cells[1].Controls[0];//取得文本框
     objDataSet.Tables["khxx"].Rows[(int)e.Item.ItemIndex]["khjc"]=CurrentText.Text;

     SqlCommandBuilder cb=new SqlCommandBuilder(objAdapter);
     SqlConn.Open();
     objAdapter.Update(objDataSet,"khxx");
     SqlConn.Close();

     DataGrid1.DataSource=objDataSet.Tables["khxx"];
     DataGrid1.DataBind();

   }
   在PageLoad()里一定要if(Page.IsPostBack){....};
   DataGrid1.DataKeyField="khbh";

8.排序:
  private void DataGrid1_SortCommand(object source, System.Web.UI.WebControls.DataGridSortCommandEventArgs e)
  {
 DataGrid1.EditItemIndex=-1;
 SqlConnection SqlConn;
 DataSet objDataSet=new DataSet();
 string Connstr=ConfigurationSettings.AppSettings["strConn"];
 string SQLstr="select * from khxx";
 SqlConn=new SqlConnection(Connstr);
 SqlDataAdapter objAdapter=new SqlDataAdapter(SQLstr,SqlConn);
 objAdapter.Fill(objDataSet,"khxx");

 DataTable objDataTable=objDataSet.Tables["khxx"];
 DataView objDataView=new DataView(objDataTable);
 objDataView.Sort=e.SortExpression;

 DataGrid1.DataSource=objDataView;
 DataGrid1.DataBind();
  }
  DataGrid1.AllowSorting=True;
  <asp:BoundColumn DataField="khbh" ReadOnly="True" HeaderText="客户编号" SortExpression="khbh">
  <ItemStyle Wrap="False"></ItemStyle></asp:BoundColumn>

9.删除一条记录:
  private void DataGrid1_DeleteCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
  {
 SqlConnection SqlConn;
 DataSet objDataSet=new DataSet();
 string Connstr=ConfigurationSettings.AppSettings["strConn"];
 SqlConn=new SqlConnection(Connstr);

 string bh=DataGrid1.DataKeys[e.Item.ItemIndex].ToString();
 string SQLstr="delete from khxx where khbh='"+bh+"'";
        //int ProductID =(int)MyDataGrid.DataKeys[(int)E.Item.ItemIndex];
        //string SQLStatement="Delete Products WHERE ProductID="+ProductID;(当字段为整数时)
   
 SqlCommand myCommand = new SqlCommand(SQLstr,SqlConn);

 myCommand.Connection.Open();
 myCommand.ExecuteNonQuery();
 myCommand.Connection.Close();

 BindGrid();
  }

10.删除时提示是否删除:
  <HEAD>
 ..... 
 <script language="javascript">
 function delete_confirm(e) {
           if (event.srcElement.outerText=="删除")
    event.returnValue=confirm("确认删除否？");
               }
           document.onclick=delete_confirm;
 </script>
  </HEAD>

11.在DataGrid里加复选框.
  <Columns>
 <asp:TemplateColumn HeaderText="" ItemStyle-HorizontalAlign="Center">
  <ItemTemplate>
   <asp:CheckBox runat="server" ID="del" />
  </ItemTemplate>
 </asp:TemplateColumn>
        ......
  </Columns>

12.选中删除多条记录:
  private void Button1_Click(object sender, System.EventArgs e)
  {
 SqlConnection SqlConn;
 string Connstr=ConfigurationSettings.AppSettings["strConn"];
 SqlConn=new SqlConnection(Connstr);

 string DelString,SIDString="";
 for(int i=0;i<DataGrid1.Items.Count;i++)
 {
  CheckBox h;
  h=(CheckBox)DataGrid1.Items[i].Cells[0].Controls[1];
  if(h.Checked == true)
  { //取得已选取的主键
   SIDString +=" or (khbh ='" + DataGrid1.Items[i].Cells[1].Text + "')";
  }
 }
 if(SIDString.Length>0)
 {
  SIDString=SIDString.Remove(0,4);
  DelString = "Delete from khxx where " + SIDString;
  SqlCommand DelRec = new SqlCommand(DelString,SqlConn);
  DelRec.Connection.Open();
  DelRec.ExecuteNonQuery();
  DelRec.Connection.Close();
  BindGrid();
 }
  }

13.不同WEB页传递参数(前一个向后一个传)：
  (WebForm1.aspx)
  private void Button2_Click(object sender, System.EventArgs e)
  {
 Response.Redirect("WebForm2.aspx@ID="+TextBox1.Text+"&NAME="+TextBox2.Text);
  }
  (WebForm2.aspx)
  private void Page_Load(object sender, System.EventArgs e)
  {
 string s;
 s=Request.QueryString["ID"];
 Label1.Text=s;
 s=Request.QueryString["NAME"];
 Label2.Text=s;  
  }

回复：
14.增加一条记录(一)：
        SqlConnection SqlConn;
        DataSet objDataSet=new DataSet();
 string Connstr=ConfigurationSettings.AppSettings["strConn"];
 string SQLstr="select * from khxx";
 SqlConn=new SqlConnection(Connstr);
 SqlDataAdapter objAdapter=new SqlDataAdapter(SQLstr,SqlConn);
 objAdapter.Fill(objDataSet,"khxx");

 DataRow row=objDataSet.Tables[0].NewRow();
 row["khbh"]=TextBox3.Text;
 row["khjc"]=TextBox4.Text;
 row["dh"]=TextBox5.Text;
 row["cjri"]=TextBox6.Text;
 row["bycgl"]=TextBox7.Text;

 objDataSet.Tables[0].Rows.Add(row);
 SqlCommandBuilder cb=new SqlCommandBuilder(objAdapter);
 objAdapter.Update(objDataSet,objDataSet.Tables[0].ToString());
 BindGrid();
15.代码色之用：
   LinkButton1.ForeColor=ColorTranslator.FromHtml("#FF8000");

16.关于加载执行：
  protected void Page_Load(Object sender, EventArgs e)
  {
  // 网页每次加载时，执行的一些操作
    if (!IsPostBack)
    {
       // 网页第一次加载时执行的操作
    }
    else
    {
      // 回送时执行的操作
    }

      // 网页每次加载时执行的操作
  }

17.打开网页时全屏显视：
   （另加default.aspx,加入：)
  <script language="javascript">
  window.open('loadfile.aspx.html','_blank','menubar=no,location=no,toolbar=no,
  scrollbars=no,status=no,top=0,left=0,width=' + screen.width + ',height=' + screen.height);
  window.opener = null;
  window.close();
  </script>

18.打开新的浏览器窗口:
  Response.Write("<SCRIPT language='javascript'> window.open('YOURURL')</SCRIPT>");

19.网页启动的时候弹出一个小窗体：
   在Page_Lod事件中加入：
   Response.Write("<script>window.open('newyear.htm','_blank','toolbar=no,location=no,directories=no,status=no,
   menubar=no,scrollbars=no,revisable=no,left=100,top=0,width=600,height=50')</" + "script>");
   弹出文件名：newyear.htm

20.Session的用法：
  //传递参数
  Session["markid"] = webform1.Text1.Value;
  Application["markid"] = webform1.Text1.Value;
  WebForm2.Text1.Value = Session["markid"].ToString();
  WebForm2.Text1.Value = Application["markid"].ToString();

  //清除
  Session.Remove("markid"); (session可以定义在webform1的任何地方。)

21.html控件：
   button光标移上移开的不同效果：
  <INPUT id="Button3" style="Z-INDEX: 111; LEFT: 248px; POSITION: absolute;
  TOP: 456px" onmouseover="this.style.color='red';"
  onmouseout="this.style.color='black';" type="button"
  value="text" name="Button3" runat="server">

22.cookie的用法：
  HttpCookie cookie = new HttpCookie("aspcn");
  cookie.Values.Add("webmaster","飞刀");
  cookie.Values.Add("writer","beige");
  cookie.Values.Add("LinkColor","blue");
  Response.AppendCookie(cookie);
  取出信息也一样简单
  HttpCookie cookie = Request.Cookies["aspcn"];
  value1 = cookies.Values["webmaster"];
  value2 = cookies.Values["writer"];

23.ASP.NET中文显示之种几种解决方法:
  (1)configuration>
      <globalization
        requestencoding="utf-8"
        responseencoding="utf-8"
      />
    </configuration>  或"gb2312" 或"big5"
  (2)添加<%@ CODEPAGE = "936" %>到每一页的开头;

24.在线用户统计:
  private void Page_Load(object sender, System.EventArgs e)
  {  
     Visitors.Text = Application["user_sessions"].ToString();
  }
  global.asax文件:
  protected void Application_Start(Object sender, EventArgs e)
  {
   Application["user_sessions"] = 0;
  }
  protected void Session_Start(Object sender, EventArgs e)
  {
   Application.Lock();
   Application["user_sessions"] = (int)Application["user_sessions"] + 1;
   Application.Unlock();
  }
  protected void Session_End(Object sender, EventArgs e)
  {
    Application.Lock();
    Application["user_sessions"] = (int)Application["user_sessions"] - 1;
    Application.Unlock();
  }

25.DataSet的一种遍历修改方法：
  SqlDataAdapter myCmd=new SqlDataAdapter(strSql,myConn);
  DataSet ds=new DataSet();
  myCmd.Fill(ds,"操作员");
  for(int i=0;i<ds.Tables[0].Rows.Count;i++)
  {
   if(ds.Tables[0].Rows[i]["Oper_state"].ToString()=="1")
    ds.Tables[0].Rows[i]["Oper_state"]="有效";
   else if(ds.Tables[0].Rows[i]["Oper_state"].ToString()=="0")
    ds.Tables[0].Rows[i]["Oper_state"]="冻结";
  }

26.自动刷新：
  <head>
  <!--每10秒自动刷新-->
  <meta http-equiv="refresh" content="10">
  </head>

27.ViewState的读取：
  // 保存在 ViewState 中
  ViewState["SortOrder"] = "DESC";
  // 从 ViewState 中读取
  string sortOrder = (string)ViewState["SortOrder"];

28.用Session传递DataSet:
  DataTable Dt=new DataTable();
  Dt=yourDataSet.Tables[yourtable].DefaultView;
  DataGrid1.DataSource=Dt;//yourDataSet是一个DataSet对象
  DataGrid1.DataBind();//假如你的“当前页”的DataGrid是这样邦定的
  Session["MyTable"]=Dt;
  另一页(打印页)：
  DataTable Dt2=new DataTable();
  Dt2=(DataTable)Session["MyTable"];
  DataGrid2.DataSource=Dt2;
  DataGrid2.DataBind();

29.超链接传递中文参数的问题:"list.aspx?name=" + Server.UrlEncode("中国");

30.Calendar的日期取出：
  private void Calendar1_SelectionChanged(object sender, System.EventArgs e)
  {
 TextBox1.Text=Calendar1.SelectedDate.ToShortDateString();
  }
  private void Calendar1_DayRender(object sender, System.Web.UI.WebControls.DayRenderEventArgs e)
  {
        ......  
  }

31.用DataTable在内存建表和加入数据方式一：
        DataTable dt=new DataTable();
 dt.Columns.Add(new DataColumn("编号",typeof(Int32)));
 dt.Columns.Add(new DataColumn("客户",typeof(string)));
 DataRow dr;
 dr=dt.NewRow();
 dr[0]=9;
 dr[1]="custom";
 dt.Rows.Add(dr);
 DataGrid1.DataSource=new DataView(dt);

32.Hashtable表的用法：
  Hashtable h = new Hashtable();
  h.Add ("键 1", "值 1");
  h.Add ("键 2", "值 2");
  h.Add ("键 3", "值 3");
  MyDataList.DataSource = h;

33.通常的DataList模板应用：
  <ItemTemplate>
        编号：<%# DataBinder.Eval(Container.DataItem,"ID","{0:N2}") %><br>
 项：<%# DataBinder.Eval(Container.DataItem,"STRING") %><br>
 日期：<%# DataBinder.Eval(Container.DataItem,"DATETIME","{0:d}") %><br>
 是否：
 <asp:CheckBox ID="checkbox1" Checked='<%# DataBinder.Eval(Container.DataItem,"BOOL") %>' Runat=server /><br>
  </ItemTemplate>

34.使用 SqlDataReader的一般方法:
  SqlConnection myConnection = new SqlConnection(".......");
  SqlCommand myCommand = new SqlCommand("select * from Authors", myConnection);
  myConnection.Open();
  SqlDataReader dr = myCommand.ExecuteReader();
  MyDataGrid.DataSource = dr;
  MyDataGrid.DataBind();
  myConnection.Close();