收集.NET的常用函数代码!大家分享,共同学习!
看见“收集java的常用函数代码!大家分享,共同学习! ”帖子很火,我也来发一个.NET的,希望大家支持! --------------------编程问答-------------------- 我先发一个SQL Server 2000数据库操作类C#
using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Data.OleDb;
using System.Data.SqlClient;
namespace System
{
class Database
{
internal DataSet GetDataSet()
{
throw new Exception("The method or operation is not implemented.");
}
public DataSet GetDataSet_SQL(String sqlstring)
{
DataSet ds = new DataSet();
try
{
string ConStr = "server=(local);user id=sa;pwd=admin;database=Corporation";
System.Data.SqlClient.SqlConnection con = new System.Data.SqlClient.SqlConnection(ConStr);
System.Data.SqlClient.SqlDataAdapter ada = new System.Data.SqlClient.SqlDataAdapter(sqlstring, con);
ada.Fill(ds);
con.Close();
ada.Dispose();
}
catch (Exception e)
{
System.Windows.Forms.MessageBox.Show(e.Message);
}
return ds;
}
public int EditData_SQL(String sqlstring)
{
int num = 0;
try
{
string connstring = "data source=localhost;initial catalog=Corporation;integrated security=SSPI;";
SqlConnection conn = new SqlConnection(connstring);
StringBuilder strSQL = new StringBuilder();
strSQL.Append(sqlstring);
using (System.Data.SqlClient.SqlCommand cmd = new System.Data.SqlClient.SqlCommand(strSQL.ToString(), conn))
{
conn.Open();
num = cmd.ExecuteNonQuery();
conn.Close();
}
}
catch (Exception e)
{
System.Windows.Forms.MessageBox.Show(e.Message);
}
return num;
}
public DataTable Conn_Excel(String ConnStr, String SqlStr)
{
DataTable dt = new DataTable();
try
{
string strOdbcCon = @"Provider=Microsoft.Jet.OLEDB.4.0;Persist Security Info=False;Data Source='" + ConnStr + "';Extended Properties=Excel 8.0";
OleDbConnection OleDB = new OleDbConnection(strOdbcCon);
OleDbDataAdapter OleDat = new OleDbDataAdapter(SqlStr, OleDB);
OleDat.Fill(dt);
}
catch (Exception ey)
{
System.Windows.Forms.MessageBox.Show(ey.Message);
}
return dt;
}
public int RestoreDatabase(String path, String dbname)
{
int num = 0;
string pathstr = "Server=(local);database=master;Uid=sa;Pwd=admin";
string sqlstr = "use master restore database " + dbname + " from disk='" + path + "'";
using (SqlConnection con = new SqlConnection(pathstr))
{
con.Open();
try
{
SqlCommand cmd = new SqlCommand(sqlstr, con);
cmd.Connection = con;
num = cmd.ExecuteNonQuery();
System.Windows.Forms.MessageBox.Show("还原数据成功");
}
catch (Exception error)
{
System.Windows.Forms.MessageBox.Show("还原失败,请确保还原项与库对应");
}
finally
{
con.Close();
}
return num;
}
}
public int SaveDatabase(String path)
{
int num = 0;
try
{
SqlConnection con = new SqlConnection(); //利用代码实现连接数据库
con.ConnectionString = "server=(local);uid=sa;pwd=admin;database=Corporation";
con.Open();
SqlCommand com = new SqlCommand();
com.CommandText = "BACKUP DATABASE Corporation TO DISK = '" + path + "'";
com.Connection = con; //连接
num = com.ExecuteNonQuery(); //执行
con.Close();
con.Dispose();
}
catch (Exception k)
{
System.Windows.Forms.MessageBox.Show(k.Message);
}
return num;
}
public bool ExportDataGridview_Excel(System.Windows.Forms.DataGridView dgv, bool isShowExcle)
{
if (dgv.Rows.Count == 0)
return false;
//建立Excel对象
Excel.Application excel = new Excel.Application();
excel.Application.Workbooks.Add(true);
excel.Visible = isShowExcle;
//生成字段名称
for (int i = 0; i < dgv.ColumnCount; i++)
{
excel.Cells[1, i + 1] = dgv.Columns[i].HeaderText;
}
//填充数据
for (int i = 0; i < dgv.RowCount - 1; i++)
{
for (int j = 0; j < dgv.ColumnCount; j++)
{
if (dgv[j, i].ValueType == typeof(string))
{
excel.Cells[i + 2, j + 1] = "'" + dgv[j, i].Value.ToString();
}
else
{
excel.Cells[i + 2, j + 1] = dgv[j, i].Value.ToString();
}
}
}
return true;
}
}
}
--------------------编程问答--------------------
Console.WriteLine("hello world");--------------------编程问答-------------------- VB.NET
Imports System.Data
Imports System.Data.SqlClient
Imports System.ComponentModel
Public Class DataBase
'实现接口IDisposable
Implements IDisposable
'数据库连接对象
Private SqlConn As SqlConnection
Public Shared sConn As String = "Persist Security Info=False;Integrated Security=SSPI;database=libbook;server=localhost;Connect Timeout=30"
Public Sub Dispose() Implements System.IDisposable.Dispose
Dispose(True)
GC.SuppressFinalize(True)
End Sub
Protected Sub Dispose(ByVal disposing As Boolean)
If disposing <> True Then
Return
End If
If SqlConn Is Nothing = False Then
SqlConn.Dispose()
SqlConn = Nothing
End If
End Sub
Public Sub Open()
If SqlConn Is Nothing = True Then
'建立数据库连接对象
SqlConn = New SqlConnection(Me.sConn)
'打开数据库连接
SqlConn.Open()
End If
End Sub
Public Sub Close()
'如果数据库连接对象不为空则关闭数据库连接
If SqlConn Is Nothing = False Then
SqlConn.Close()
End If
End Sub
Public Function RunSelectSQL(ByVal sSQLString As System.String) As DataView
Me.Open()
Dim SqlDS As DataSet = New DataSet
Dim SqlDA As SqlDataAdapter = New SqlDataAdapter(sSQLString, Me.SqlConn)
SqlDA.Fill(SqlDS)
Return SqlDS.Tables(0).DefaultView
End Function
Public Function RunDelOrInsSQL(ByVal sSQLString As System.String)
Me.Open()
Dim SqlComm As SqlCommand = New SqlCommand(sSQLString, Me.SqlConn)
SqlComm.ExecuteNonQuery()
End Function
End Class
--------------------编程问答-------------------- 1. 打开新的窗口并传送参数:
传送参数:
response.write("<script>window.open(’*.aspx?id="+this.DropDownList1.SelectIndex+"&id1="+...+"’)</script>")
接收参数:
string a = Request.QueryString("id");
string b = Request.QueryString("id1");
2.为按钮添加对话框
Button1.Attributes.Add("onclick","return confirm(’确认?’)");
button.attributes.add("onclick","if(confirm(’are you sure...?’)){return true;}else{return false;}")
3.删除表格选定记录
int intEmpID = (int)MyDataGrid.DataKeys[e.Item.ItemIndex];
string deleteCmd = "DELETE from Employee where emp_id = " + intEmpID.ToString()
4.删除表格记录警告
private void DataGrid_ItemCreated(Object sender,DataGridItemEventArgs e)
{
switch(e.Item.ItemType)
{
case ListItemType.Item :
case ListItemType.AlternatingItem :
case ListItemType.EditItem:
TableCell myTableCell;
myTableCell = e.Item.Cells[14];
LinkButton myDeleteButton ;
myDeleteButton = (LinkButton)myTableCell.Controls[0];
myDeleteButton.Attributes.Add("onclick","return confirm(’您是否确定要删除这条信息’);");
break;
default:
break;
}
}
5.点击表格行链接另一页
private void grdCustomer_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
{
//点击表格打开
if (e.Item.ItemType == ListItemType.Item e.Item.ItemType == ListItemType.AlternatingItem)
e.Item.Attributes.Add("onclick","window.open(’Default.aspx?id=" + e.Item.Cells[0].Text + "’);");
}
双击表格连接到另一页
在itemDataBind事件中
if(e.Item.ItemType == ListItemType.Item e.Item.ItemType == ListItemType.AlternatingItem)
{
string OrderItemID =e.item.cells[1].Text;
...
e.item.Attributes.Add("ondblclick", "location.href=’../ShippedGrid.aspx?id=" + OrderItemID + "’");
}
双击表格打开新一页
if(e.Item.ItemType == ListItemType.Item e.Item.ItemType == ListItemType.AlternatingItem)
{
string OrderItemID =e.item.cells[1].Text;
...
e.item.Attributes.Add("ondblclick", "open(’../ShippedGrid.aspx?id=" + OrderItemID + "’)");
}
★特别注意:【?id=】 处不能为 【?id =】
6.表格超连接列传递参数
<asp:HyperLinkColumn Target="_blank" headertext="ID号" DataTextField="id" NavigateUrl="aaa.aspx?id=’
<%# DataBinder.Eval(Container.DataItem, "数据字段1")%>’ & name=’<%# DataBinder.Eval(Container.DataItem, "数据字段2")%>’ />
7.表格点击改变颜色
if (e.Item.ItemType == ListItemType.Item e.Item.ItemType == ListItemType.AlternatingItem)
{
e.Item.Attributes.Add("onclick","this.style.backgroundColor=’#99cc00’;
this.style.color=’buttontext’;this.style.cursor=’default’;");
}
写在DataGrid的_ItemDataBound里
if (e.Item.ItemType == ListItemType.Item e.Item.ItemType == ListItemType.AlternatingItem)
{
e.Item.Attributes.Add("onmouseover","this.style.backgroundColor=’#99cc00’;
this.style.color=’buttontext’;this.style.cursor=’default’;");
e.Item.Attributes.Add("onmouseout","this.style.backgroundColor=’’;this.style.color=’’;");
}
8.关于日期格式
日期格式设定
DataFormatString="{0:yyyy-MM-dd}"
我觉得应该在itembound事件中
e.items.cell["你的列"].text=DateTime.Parse(e.items.cell["你的列"].text.ToString("yyyy-MM-dd"))
9.获取错误信息并到指定页面
不要使用Response.Redirect,而应该使用Server.Transfer
e.g
// in global.asax
protected void Application_Error(Object sender, EventArgs e) {
if (Server.GetLastError() is HttpUnhandledException)
Server.Transfer("MyErrorPage.aspx");
//其余的非HttpUnhandledException异常交给ASP.NET自己处理就okay了 :)
}
Redirect会导致post-back的产生从而丢失了错误信息,所以页面导向应该直接在服务器端执行,这样就可以在错误处理页面得到出错信息并进行相应的处理
10.清空Cookie
Cookie.Expires=[DateTime];
Response.Cookies("UserName").Expires = 0
11.自定义异常处理
//自定义异常处理类
using System;
using System.Diagnostics;
namespace MyAppException
{
/// <summary>
/// 从系统异常类ApplicationException继承的应用程序异常处理类。
/// 自动将异常内容记录到Windows NT/2000的应用程序日志
/// </summary>
public class AppException:System.ApplicationException
{
public AppException()
{
if (ApplicationConfiguration.EventLogEnabled)LogEvent("出现一个未知错误。");
}
public AppException(string message)
{
LogEvent(message);
}
public AppException(string message,Exception innerException)
{
LogEvent(message);
if (innerException != null)
{
LogEvent(innerException.Message);
}
}
//日志记录类
using System;
using System.Configuration;
using System.Diagnostics;
using System.IO;
using System.Text;
using System.Threading;
namespace MyEventLog
{
/// <summary>
/// 事件日志记录类,提供事件日志记录支持
/// <remarks>
/// 定义了4个日志记录方法 (error, warning, info, trace)
/// </remarks>
/// </summary>
public class ApplicationLog
{
/// <summary>
/// 将错误信息记录到Win2000/NT事件日志中
/// <param name="message">需要记录的文本信息</param>
/// </summary>
public static void WriteError(String message)
{
WriteLog(TraceLevel.Error, message);
}
/// <summary>
/// 将警告信息记录到Win2000/NT事件日志中
/// <param name="message">需要记录的文本信息</param>
/// </summary>
public static void WriteWarning(String message)
{
WriteLog(TraceLevel.Warning, message);
}
/// <summary>
/// 将提示信息记录到Win2000/NT事件日志中
/// <param name="message">需要记录的文本信息</param>
/// </summary>
public static void WriteInfo(String message)
{
WriteLog(TraceLevel.Info, message);
}
/// <summary>
/// 将跟踪信息记录到Win2000/NT事件日志中
/// <param name="message">需要记录的文本信息</param>
/// </summary>
public static void WriteTrace(String message)
{
WriteLog(TraceLevel.Verbose, message);
}
/// <summary>
/// 格式化记录到事件日志的文本信息格式
/// <param name="ex">需要格式化的异常对象</param>
/// <param name="catchInfo">异常信息标题字符串.</param>
/// <retvalue>
/// <para>格式后的异常信息字符串,包括异常内容和跟踪堆栈.</para>
/// </retvalue>
/// </summary>
public static String FormatException(Exception ex, String catchInfo)
{
StringBuilder strBuilder = new StringBuilder();
if (catchInfo != String.Empty)
{
strBuilder.Append(catchInfo).Append("\r\n");
}
strBuilder.Append(ex.Message).Append("\r\n").Append(ex.StackTrace);
return strBuilder.ToString();
}
/// <summary>
/// 实际事件日志写入方法
/// <param name="level">要记录信息的级别(error,warning,info,trace).</param>
/// <param name="messageText">要记录的文本.</param>
/// </summary>
private static void WriteLog(TraceLevel level, String messageText)
{
try
{
EventLogEntryType LogEntryType;
switch (level)
{
case TraceLevel.Error:
LogEntryType = EventLogEntryType.Error;
break;
case TraceLevel.Warning:
LogEntryType = EventLogEntryType.Warning;
break;
case TraceLevel.Info:
LogEntryType = EventLogEntryType.Information;
break;
case TraceLevel.Verbose:
LogEntryType = EventLogEntryType.SuccessAudit;
break;
default:
LogEntryType = EventLogEntryType.SuccessAudit;
break;
}
EventLog eventLog = new EventLog("Application", ApplicationConfiguration.EventLogMachineName, ApplicationConfiguration.EventLogSourceName );
//写入事件日志
eventLog.WriteEntry(messageText, LogEntryType);
}
catch {} //忽略任何异常
}
} //class ApplicationLog
}
12.Panel 横向滚动,纵向自动扩展
<asp:panel style="overflow-x:scroll;overflow-y:auto;"></asp:panel>
13.回车转换成Tab
<script language="javascript" for="document" event="onkeydown">
if(event.keyCode==13 && event.srcElement.type!=’button’ && event.srcElement.type!=’submit’ && event.srcElement.type!=’reset’ && event.srcElement.type!=’’&& event.srcElement.type!=’textarea’);
event.keyCode=9;
</script>
onkeydown="if(event.keyCode==13) event.keyCode=9"
14.DataGrid超级连接列
DataNavigateUrlField="字段名" DataNavigateUrlFormatString="http://xx/inc/delete.aspx?ID={0}"
15.DataGrid行随鼠标变色
private void DGzf_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
{
if (e.Item.ItemType!=ListItemType.Header)
{
e.Item.Attributes.Add( "onmouseout","this.style.backgroundColor=\""+e.Item.Style["BACKGROUND-COLOR"]+"\"");
e.Item.Attributes.Add( "onmouseover","this.style.backgroundColor=\""+ "#EFF3F7"+"\"");
}
}
16.模板列
<ASP:TEMPLATECOLUMN visible="False" sortexpression="demo" headertext="ID">
<ITEMTEMPLATE>
<ASP:LABEL text=’<%# DataBinder.Eval(Container.DataItem, "ArticleID")%>’ runat="server" width="80%" id="lblColumn" />
</ITEMTEMPLATE>
</ASP:TEMPLATECOLUMN>
<ASP:TEMPLATECOLUMN headertext="选中">
<HEADERSTYLE wrap="False" horizontalalign="Center"></HEADERSTYLE>
<ITEMTEMPLATE>
<ASP:CHECKBOX id="chkExport" runat="server" />
</ITEMTEMPLATE>
<EDITITEMTEMPLATE>
<ASP:CHECKBOX id="chkExportON" runat="server" enabled="true" />
</EDITITEMTEMPLATE>
</ASP:TEMPLATECOLUMN>
后台代码
protected void CheckAll_CheckedChanged(object sender, System.EventArgs e)
{
//改变列的选定,实现全选或全不选。
CheckBox chkExport ;
if( CheckAll.Checked)
{
foreach(DataGridItem oDataGridItem in MyDataGrid.Items)
{
chkExport = (CheckBox)oDataGridItem.FindControl("chkExport");
chkExport.Checked = true;
}
}
else
{
foreach(DataGridItem oDataGridItem in MyDataGrid.Items)
{
chkExport = (CheckBox)oDataGridItem.FindControl("chkExport");
chkExport.Checked = false;
}
}
}
17.数字格式化
【<%#Container.DataItem("price")%>的结果是500.0000,怎样格式化为500.00?】
<%#Container.DataItem("price","{0:¥#,##0.00}")%>
int i=123456;
string s=i.ToString("###,###.00");
--------------------编程问答-------------------- 18.日期格式化
【aspx页面内:<%# DataBinder.Eval(Container.DataItem,"Company_Ureg_Date")%>
显示为: 2004-8-11 19:44:28
我只想要:2004-8-11 】
<%# DataBinder.Eval(Container.DataItem,"Company_Ureg_Date","{0:yyyy-M-d}")%>
应该如何改?
【格式化日期】
取出来,一般是object((DateTime)objectFromDB).ToString("yyyy-MM-dd");
【日期的验证表达式】
A.以下正确的输入格式: [2004-2-29], [2004-02-29 10:29:39 pm], [2004/12/31]
^((\d{2}(([02468][048]) ([13579][26]))[\-\/\s]?((((0?[13578]) (1[02]))[\-\/\s]?((0?[1-9]) ([1-2][0-9]) (3[01]))) (((0?[469]) (11))[\-\/\s]?((0?[1-9]) ([1-2][0-9]) (30))) (0?2[\-\/\s]?((0?[1-9]) ([1-2][0-9]))))) (\d{2}(([02468][1235679]) ([13579][01345789]))[\-\/\s]?((((0?[13578]) (1[02]))[\-\/\s]?((0?[1-9]) ([1-2][0-9]) (3[01]))) (((0?[469]) (11))[\-\/\s]?((0?[1-9]) ([1-2][0-9]) (30))) (0?2[\-\/\s]?((0?[1-9]) (1[0-9]) (2[0-8]))))))(\s(((0?[1-9]) (1[0-2]))\:([0-5][0-9])((\s) (\:([0-5][0-9])\s))([AM PM am pm]{2,2})))?$
B.以下正确的输入格式:[0001-12-31], [9999 09 30], [2002/03/03]
^\d{4}[\-\/\s]?((((0[13578]) (1[02]))[\-\/\s]?(([0-2][0-9]) (3[01]))) (((0[469]) (11))[\-\/\s]?(([0-2][0-9]) (30))) (02[\-\/\s]?[0-2][0-9]))$
【大小写转换】
HttpUtility.HtmlEncode(string);
HttpUtility.HtmlDecode(string)
19.如何设定全局变量
Global.asax中
Application_Start()事件中
添加Application[属性名] = xxx;
就是你的全局变量
20.怎样作到HyperLinkColumn生成的连接后,点击连接,打开新窗口?
HyperLinkColumn有个属性Target,将器值设置成"_blank"即可.(Target="_blank")
【ASPNETMENU】点击菜单项弹出新窗口
在你的menuData.xml文件的菜单项中加入URLTarget="_blank",如:
<?xml version="1.0" encoding="GB2312"?>
<MenuData ImagesBaseURL="images/">
<MenuGroup>
<MenuItem Label="内参信息" URL="Infomation.aspx" >
<MenuGroup ID="BBC">
<MenuItem Label="公告信息" URL="Infomation.aspx" URLTarget="_blank" LeftIcon="file.gif"/>
<MenuItem Label="编制信息简报" URL="NewInfo.aspx" LeftIcon="file.gif" />
......
最好将你的aspnetmenu升级到1.2版
21.读取DataGrid控件TextBox值
foreach(DataGrid dgi in yourDataGrid.Items)
{
TextBox tb = (TextBox)dgi.FindControl("yourTextBoxId");
tb.Text....
}
23.在DataGrid中有3个模板列包含Textbox分别为 DG_ShuLiang (数量) DG_DanJian(单价) DG_JinE(金额)分别在5.6.7列,要求在录入数量及单价的时候自动算出金额即:数量*单价=金额还要求录入时限制为 数值型.我如何用客户端脚本实现这个功能?
〖思归〗
<asp:TemplateColumn HeaderText="数量">
<ItemTemplate>
<asp:TextBox id="ShuLiang" runat=’server’ Text=’<%# DataBinder.Eval(Container.DataItem,"DG_ShuLiang")%>’
onkeyup="javascript:DoCal()"
/>
<asp:RegularExpressionValidator id="revS" runat="server" ControlToValidate="ShuLiang" ErrorMessage="must be integer" ValidationExpression="^\d+$" />
</ItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn HeaderText="单价">
<ItemTemplate>
<asp:TextBox id="DanJian" runat=’server’ Text=’<%# DataBinder.Eval(Container.DataItem,"DG_DanJian")%>’
onkeyup="javascript:DoCal()"
/>
<asp:RegularExpressionValidator id="revS2" runat="server" ControlToValidate="DanJian" ErrorMessage="must be numeric" ValidationExpression="^\d+(\.\d*)?$" />
</ItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn HeaderText="金额">
<ItemTemplate>
<asp:TextBox id="JinE" runat=’server’ Text=’<%# DataBinder.Eval(Container.DataItem,"DG_JinE")%>’ />
</ItemTemplate>
</asp:TemplateColumn><script language="javascript">
function DoCal()
{
var e = event.srcElement;
var row = e.parentNode.parentNode;
var txts = row.all.tags("INPUT");
if (!txts.length txts.length < 3)
return;
var q = txts[txts.length-3].value;
var p = txts[txts.length-2].value;
if (isNaN(q) isNaN(p))
return;
q = parseInt(q);
p = parseFloat(p);
txts[txts.length-1].value = (q * p).toFixed(2);
}
</script>
24.datagrid选定比较底下的行时,为什么总是刷新一下,然后就滚动到了最上面,刚才选定的行因屏幕的关系就看不到了。
page_load
page.smartNavigation=true
25.在Datagrid中修改数据,当点击编辑键时,数据出现在文本框中,怎么控制文本框的大小 ?
private void DataGrid1_ItemDataBound(obj sender,DataGridItemEventArgs e)
{
for(int i=0;i<e.Item.Cells.Count-1;i++)
if(e.Item.ItemType==ListItemType.EditType)
{
e.Item.Cells[i].Attributes.Add("Width", "80px")
}
}
26.对话框
private static string ScriptBegin = "<script language=\"JavaScript\">";
private static string ScriptEnd = "</script>";
public static void ConfirmMessageBox(string PageTarget,string Content)
{
string ConfirmContent="var retValue=window.confirm(’"+Content+"’);"+"if(retValue){window.location=’"+PageTarget+"’;}";
ConfirmContent=ScriptBegin + ConfirmContent + ScriptEnd;
Page ParameterPage = (Page)System.Web.HttpContext.Current.Handler;
ParameterPage.RegisterStartupScript("confirm",ConfirmContent);
//Response.Write(strScript);
}
27. 将时间格式化:string aa=DateTime.Now.ToString("yyyy年MM月dd日");
1.1 取当前年月日时分秒
currentTime=System.DateTime.Now;
1.2 取当前年
int 年= DateTime.Now.Year;
1.3 取当前月
int 月= DateTime.Now.Month;
1.4 取当前日
int 日= DateTime.Now.Day;
1.5 取当前时
int 时= DateTime.Now.Hour;
1.6 取当前分
int 分= DateTime.Now.Minute;
1.7 取当前秒
int 秒= DateTime.Now.Second;
1.8 取当前毫秒
int 毫秒= DateTime.Now.Millisecond;
28.自定义分页代码:
先定义变量 :
public static int pageCount; //总页面数
public static int curPageIndex=1; //当前页面
下一页:
if(DataGrid1.CurrentPageIndex < (DataGrid1.PageCount - 1))
{
DataGrid1.CurrentPageIndex += 1;
curPageIndex+=1;
}
bind(); // DataGrid1数据绑定函数
上一页:
if(DataGrid1.CurrentPageIndex >0)
{
DataGrid1.CurrentPageIndex += 1;
curPageIndex-=1;
}
bind(); // DataGrid1数据绑定函数
直接页面跳转:
int a=int.Parse(JumpPage.Value.Trim());//JumpPage.Value.Trim()为跳转值
if(a<DataGrid1.PageCount)
{
this.DataGrid1.CurrentPageIndex=a;
}
bind();
29.DataGrid使用:
添加删除确认:
private void DataGrid1_ItemCreated(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
{
foreach(DataGridItem di in this.DataGrid1.Items)
{
if(di.ItemType==ListItemType.Item di.ItemType==ListItemType.AlternatingItem)
{
((LinkButton)di.Cells[8].Controls[0]).Attributes.Add("onclick","return confirm(’确认删除此项吗?’);");
}
}
}
样式交替:
ListItemType itemType = e.Item.ItemType;
if (itemType == ListItemType.Item )
{
e.Item.Attributes["onmouseout"] = "javascript:this.style.backgroundColor=’#FFFFFF’;";
e.Item.Attributes["onmouseover"] = "javascript:this.style.backgroundColor=’#d9ece1’;cursor=’hand’;" ;
}
else if( itemType == ListItemType.AlternatingItem)
{
e.Item.Attributes["onmouseout"] = "javascript:this.style.backgroundColor=’#a0d7c4’;";
e.Item.Attributes["onmouseover"] = "javascript:this.style.backgroundColor=’#d9ece1’;cursor=’hand’;" ;
}
添加一个编号列:
DataTable dt= c.ExecuteRtnTableForAccess(sqltxt); //执行sql返回的DataTable
DataColumn dc=dt.Columns.Add("number",System.Type.GetType("System.String"));
for(int i=0;i<dt.Rows.Count;i++)
{
dt.Rows[i]["number"]=(i+1).ToString();
}
DataGrid1.DataSource=dt;
DataGrid1.DataBind();
DataGrid1中添加一个CheckBox,页面中添加一个全选框
private void CheckBox2_CheckedChanged(object sender, System.EventArgs e)
{
foreach(DataGridItem thisitem in DataGrid1.Items)
{
((CheckBox)thisitem.Cells[0].Controls[1]).Checked=CheckBox2.Checked;
}
}
将当前页面中DataGrid1显示的数据全部删除
foreach(DataGridItem thisitem in DataGrid1.Items)
{
if(((CheckBox)thisitem.Cells[0].Controls[1]).Checked)
{
string strloginid= DataGrid1.DataKeys[thisitem.ItemIndex].ToString();
Del (strloginid); //删除函数
}
}
30.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();
31. 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%
32、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);
33.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");
} --------------------编程问答-------------------- 谢谢楼主分享!俺收藏了 --------------------编程问答-------------------- http://topic.csdn.net/u/20090702/13/b786959f-f51b-458a-b82d-00f38113ab3a.html --------------------编程问答-------------------- 不错 帮顶个 --------------------编程问答-------------------- C#中如何判断字符串是全角还是半角
全角是指用二个字节来表示的一个字符
半角是用一个字节来表示的一个字符
这样的话我们就可以用string.length 和System.text.Encoding.Default.GetByteCount来判断
其中string.length表示字符串的字符数,
System.text.Encoding.Default.GetByteCount表示字符串的字节数。
判断半角如下:
if (checkString.Length == Encoding.Default.GetByteCount(checkString))
{
return true;
}
else
{
return false;
}
全角如下:
if (2 * checkString.Length == Encoding.Default.GetByteCount(checkString))
{
return true;
}
else
{
return false;
} --------------------编程问答-------------------- 先收藏了 --------------------编程问答-------------------- 以下是VB.NET读取XML文件的代码
XML文件内容
<?xml version="1.0" encoding="gb2312"?>
<SystemIP>
<IP>
<num>localhost</num>
</IP>
<Userid>
<name>sa</name>
</Userid>
<Userpass>
<pass>admin</pass>
</Userpass>
</SystemIP>
代码
Public Class editxml
Dim mXmlDoc As New System.Xml.XmlDocument
Public XmlFile As String
Public Sub New(ByVal File As String)
MyClass.XmlFile = File
MyClass.mXmlDoc.Load(MyClass.XmlFile) '加载配置文件
End Sub
'功能:取得元素值
'参数:node--节点 element--元素名
'返回:元素值 字符型
' $--表示出错误
Public Function GetElement(ByVal node As String, ByVal element As String) As String
On Error GoTo Err
Dim mXmlNode As System.Xml.XmlNode = mXmlDoc.SelectSingleNode("//" + node)
'读数据
Dim xmlNode As System.Xml.XmlNode = mXmlNode.SelectSingleNode(element)
Return xmlNode.InnerText.ToString
Err:
Return "$"
End Function
'
'功能:保存元素值
'参数:node--节点名称 element--元素名 val--值
'返回:True--保存成功 False--保存失败
Public Function SaveElement(ByVal node As String, ByVal element As String, ByVal val As String) As Boolean
On Error GoTo err
Dim mXmlNode As System.Xml.XmlNode = mXmlDoc.SelectSingleNode("//" + node)
Dim xmlNodeNew As System.Xml.XmlNode
xmlNodeNew = mXmlNode.SelectSingleNode(element)
xmlNodeNew.InnerText = val
mXmlDoc.Save(MyClass.XmlFile)
Return True
err:
Return False
End Function
End Class
调用方法
Dim rxml As New editxml("IP.xml")
Dim setip As String = rxml.GetElement("IP", "num")
Dim uname As String = rxml.GetElement("Userid", "name")
Dim upass As String = rxml.GetElement("Userpass", "pass") --------------------编程问答-------------------- 判断今天是星期几(VB.NET)
Module funModule
Public Function nowweekday()
Dim str As String
Dim w As Integer = Weekday(Now)
If w = 1 Then
str = "星期日"
ElseIf w = 2 Then
str = "星期一"
ElseIf w = 3 Then
str = "星期二"
ElseIf w = 4 Then
str = "星期三"
ElseIf w = 5 Then
str = "星期四"
ElseIf w = 6 Then
str = "星期五"
ElseIf w = 7 Then
str = "星期六"
End If
Return str
End Function
End Module --------------------编程问答-------------------- 以下是VB.NET读取XML文件的代码
XML文件内容
<?xml version="1.0" encoding="gb2312"?>
<SystemIP>
<IP>
<num>localhost</num>
</IP>
<Userid>
<name>sa</name>
</Userid>
<Userpass>
<pass>admin</pass>
……
[/Quote] --------------------编程问答-------------------- 楼主同志,为什么不写成围脖?
补充:.NET技术 , .NET Framework