ASP.NET程序中常用代码汇总（四）

31. 当文件在不同目录下，需要获取数据库连接字符串（如果连接字符串放在Web.config，然后在Global.asax中初始化）
在Application_Start中添加以下代码：

Application[ " ConnStr " ] = this .Context.Request.PhysicalApplicationPath + ConfigurationSettings.
AppSettings[ " ConnStr " ].ToString();

32.变量.ToString()
字符型转换转为字符串

12345 .ToString( " n " ); // 生成 12,345.00
12345 .ToString( " C " ); // 生成￥12,345.00
12345 .ToString( " e " ); // 生成 1.234500e+004
12345 .ToString( " f4 " ); // 生成 12345.0000
12345 .ToString( " x " ); // 生成 3039 (16进制)
12345 .ToString( " p " ); // 生成 1,234,500.00%

33.变量.Substring(参数1,参数2);
截取字串的一部分，参数1为左起始位数，参数2为截取几位。如：string s1 = str.Substring(0,2);
34.在自己的网站上登陆其他网站：(如果你的页面是通过嵌套方式的话，因为一个页面只能有一个FORM，这时可以导向另外一个页面再提交登陆信息)

＜SCRIPT language="javascript"＞
＜!--
function gook(pws)
{
frm.submit();
}
//--＞

＜/SCRIPT＞＜body leftMargin="0" topMargin="0" onload="javascript:gook()" marginwidth="0" marginheight="0"＞
＜form name="frm" action=" http://220.194.55.68:6080/login.php?retid=7259 " method="post"＞
＜tr＞
＜td＞
＜input id="f_user" type="hidden" size="1" name="f_user" runat="server"＞
＜input id="f_domain" type="hidden" size="1" name="f_domain" runat="server"＞
＜input class="box" id="f_pass" type="hidden" size="1" name="pwshow" runat="server"＞

＜INPUT id="lng" type="hidden" maxLength="20" size="1" value="5" name="lng"＞
＜INPUT id="tem" type="hidden" size="1" value="2" name="tem"＞

＜/td＞

＜/tr＞

＜/form＞

文本框的名称必须是你要登陆的网页上的名称，如果源码不行可以用vsniffer 看看。
下面是获取用户输入的登陆信息的代码：

string name;
name=Request.QueryString["EmailName"];

try
{
int a=name.IndexOf("@",0,name.Length);
f_user.Value=name.Substring(0,a);
f_domain.Value=name.Substring(a+1,name.Length-(a+1));
f_pass.Value=Request.QueryString["Psw"];
}

catch
{
Script.Alert("错误的邮箱!");
Server.Transfer("index.aspx");
}

35.警告窗口

/**/ ///

1<summary>   
2![](http://ghd258.cnblogs.com/Images/OutliningIndicators/InBlock.gif) ///  服务器端弹出alert对话框   
3![](http://ghd258.cnblogs.com/Images/OutliningIndicators/InBlock.gif) ///  </summary>

///

1<param name="str_Message"/>

提示信息,例子："不能为空!"
///

1<param name="page"/>

Page类
public void Alert( string str_Message,Page page)
{
page.RegisterStartupScript( "" , "

1<script>alert('  "  \+  str_Message  \+  "  ');</script>

" );
}

36.重载此警告窗口,使某控件获得焦点

/**/ ///

1<summary>   
2![](http://ghd258.cnblogs.com/Images/OutliningIndicators/InBlock.gif) ///  服务器端弹出alert对话框，并使控件获得焦点   
3![](http://ghd258.cnblogs.com/Images/OutliningIndicators/InBlock.gif) ///  </summary>

///

1<param name="str_Ctl_Name"/>

获得焦点控件Id值,比如：txt_Name
///

1<param name="str_Message"/>

提示信息,例子："请输入您姓名!"
///

1<param name="page"/>

Page类
public void Alert( string str_Ctl_Name, string str_Message,Page page)
{
page.RegisterStartupScript( "" , "

1<script>alert('  "  \+  str_Message  \+  "  ');document.forms(0).  "  \+  str_Ctl_Name  \+  "  .focus(); document.forms(0).  "  \+  str_Ctl_Name  \+  "  .select();</script>

" );
}

37.确认对话框

/**/ ///

1<summary>   
2![](http://ghd258.cnblogs.com/Images/OutliningIndicators/InBlock.gif) ///  服务器端弹出confirm对话框   
3![](http://ghd258.cnblogs.com/Images/OutliningIndicators/InBlock.gif) ///  </summary>

///

1<param name="str_Message"/>

提示信息,例子："您是否确认删除!"
///

1<param name="btn"/>

隐藏Botton按钮Id值,比如：btn_Flow
///

1<param name="page"/>

Page类
public void Confirm( string str_Message, string btn,Page page)
{
page.RegisterStartupScript( "" , "

1<script> if (confirm('  "  \+  str_Message  \+  "  ')==true){document.forms(0).  "  \+  btn  \+  "  .click();}</script>

" );
}

38.重载确认对话框，点击确定触发一个隐藏按钮事件，点击取消触发一个隐藏按钮事件

/**/ ///

1<summary>   
2![](http://ghd258.cnblogs.com/Images/OutliningIndicators/InBlock.gif) ///  服务器端弹出confirm对话框,询问用户准备转向那些操作，包括“确定”和“取消”时的操作   
3![](http://ghd258.cnblogs.com/Images/OutliningIndicators/InBlock.gif) ///  </summary>

///

1<param name="str_Message"/>

提示信息，比如："成功增加数据,单击"确定"按钮填写流程,单击"取消"修改数据"
///

1<param name="btn_Redirect_Flow"/>

"确定"按钮id值
///

1<param name="btn_Redirect_Self"/>

"取消"按钮id值
///

1<param name="page"/>

Page类
public void Confirm( string str_Message, string btn_Redirect_Flow, string btn_Redirect_Self,Page page)
{
page.RegisterStartupScript( "" , "

1<script> if (confirm('  "  \+  str_Message  \+  "  ')==true){document.forms(0).  "  \+  btn_Redirect_Flow  \+  "  .click();}else{document.forms(0).  "  \+  btn_Redirect_Self  \+  "  .click();}</script>

" );
}

39.获得焦点

/**/ ///

1<summary>   
2![](http://ghd258.cnblogs.com/Images/OutliningIndicators/InBlock.gif) ///  使控件获得焦点   
3![](http://ghd258.cnblogs.com/Images/OutliningIndicators/InBlock.gif) ///  </summary>

///

1<param name="str_Ctl_Name"/>

获得焦点控件Id值,比如：txt_Name
///

1<param name="page"/>

Page类
public void GetFocus( string str_Ctl_Name,Page page)
{
page.RegisterStartupScript( "" , "

1<script>document.forms(0).  "  \+  str_Ctl_Name  \+  "  .focus(); document.forms(0).  "  \+  str_Ctl_Name  \+  "  .select();</script>

" );
}

40.子窗体返回主窗体

/**/ ///

1<summary>   
2![](http://ghd258.cnblogs.com/Images/OutliningIndicators/InBlock.gif) ///  名称：redirect   
3![](http://ghd258.cnblogs.com/Images/OutliningIndicators/InBlock.gif) ///  功能：子窗体返回主窗体   
4![](http://ghd258.cnblogs.com/Images/OutliningIndicators/InBlock.gif) ///  参数：url   
5![](http://ghd258.cnblogs.com/Images/OutliningIndicators/InBlock.gif) ///  返回值：空   
6![](http://ghd258.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif) ///  </summary>

public void redirect( string url,Page page)
{
if ( Session[ " IfDefault " ] != ( object ) " Default " )
{
page.RegisterStartupScript( "" , "

1<script>window.top.document.location.href='  "  \+  url  \+  "  ';</script>

" );
}
}