asp.net用的一些技巧

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转载最新推荐文章于 2026-05-11 16:32:03 发布 849 阅读 AI 写同款· GEO 优化 ›

ASP.NET实现动态图片轮播技巧 JavaScript是一种轻量级的编程语言，它使得网页能够具有交互式功能。作为一个解释执行的脚本语言，JavaScript不依赖于任何特定的浏览器，但是它运行在浏览器所提供的JavaScript引擎中。在图片切换中，JavaScript扮演了执行逻辑判断和动态内容更新的角色。通过DOM操作，JavaScript能够实时修改网页内容，包括改变图片的显示、处理用户的点击事件等。// 一个简单的JavaScript示例在上述代码中，函数接受一个参数src，这个参数代表图片的地址。阅读详情

1.为按钮添加确认对话框
Button.Attributes.Add("onclick","return confirm('确认?')");
Button.Attributes.Add("onclick","if(confirm('确定?')){return true;}else{return false;}")

2.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")%>'/>

3.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';");
}

4.清空Cookie
Cookie.Expires=[DateTime];
Response.Cookies("UserName").Expires = 0;

5.Panel 横向滚动，纵向自动扩展
<asp:panel style="overflow-x:scroll;overflow-y:auto;"></asp:panel>

6.数字格式化
<%#Container.DataItem("price")%> 结果:500.0000格式化:500.00
<%#Container.DataItem("price","{0:￥#,##0.00}")%>
int i=123456;
string s=i.ToString("###,###.00");

7.日期格式化
<%# DataBinder.Eval(Container.DataItem,"Date")%> 结果:2004-8-11 19:44:28 格式化:2004-8-11
<%# DataBinder.Eval(Container.DataItem,"Date","{0:yyyy-M-d}")%>

8.时间格式化
string aa=DateTime.Now.ToString("yyyy年MM月dd日");
当前年月日时分秒 currentTime=System.DateTime.Now;
当前年 int 年= DateTime.Now.Year;
当前毫秒 int 毫秒= DateTime.Now.Millisecond;

9.自定义分页代码
public static int pageCount; //总页面数
public static int curPageIndex=1; //当前页面　　
if(ccDataGrid.CurrentPageIndex<(ccDataGrid.PageCount - 1))
{//下一页
　 ccDataGrid.CurrentPageIndex += 1;
　 curPageIndex+=1;
}
bind(); // ccDataGrid数据绑定函数
if(ccDataGrid.CurrentPageIndex>0)
{ //上一页
　 ccDataGrid.CurrentPageIndex += 1;
　 curPageIndex-=1;
}
bind(); // ccDataGrid数据绑定函数
int a=int.Parse(JumpPage.Value.Trim());//JumpPage.Value.Trim()为跳转值
if(a<DataGrid1.PageCount)
{ //直接页面跳转
　 this.ccDataGrid.CurrentPageIndex=a;
}
bind(); // ccDataGrid数据绑定函数

10.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%

11.客户端验证控件
//验证空值
<asp:requiredfieldvalidator id="valUsername" runat="server" controltovalidate="txtUsername" display="None" errormessage="请输入用户名 !!"></asp:requiredfieldvalidator>
//验证网址
<asp:regularexpressionvalidator id="rev" runat="server" ErrorMessage="公司网址不合法[要有http://] ！" Display="None" ControlToValidate="txtCPWebsite" ValidationExpression="http://([/w-]+/.)+[/w-]+(/[/w- ./?%&=]*)?"></asp:regularexpressionvalidator>
//验证邮箱
<asp:RequiredFieldValidator id="rfv" runat="server" ControlToValidate="txtCPEmail" Display="None" ErrorMessage="请输入电子邮箱 !!"></asp:RequiredFieldValidator>
//验证邮编
<asp:regularexpressionvalidator id="rev5" runat="server" ErrorMessage="邮政编码不合法！" Display="None" ControlToValidate="txtCPPostCode" ValidationExpression="/d{6}"></asp:regularexpressionvalidator>
//显示错误信息
<asp:validationsummary id="vs" runat="server" ShowSummary="False" ShowMessageBox="True"></asp:validationsummary>

12.DataBinding绑定表达式
1) 普通的绑定表达式
<%# DataBinder.Eval(Container.DataItem, "ContactName") %>
2) 文本+绑定表达式
<asp:Label id=lblDate runat="server" Text='<%# "[" + DataBinder.Eval(Container, "DataItem.NewsCreatedate") + "]" %>' ForeColor="Red"></asp:Label>
3) 同时带有显示格式的绑定表达式
<%# DataBinder.Eval(Container,"DataItem.USActiveDate","{0:yyyy-MM-dd}") %>
4) 结合绑定表达式和模态框
<A href='<%# ShowModalWin(Convert.ToString(DataBinder.Eval(Container.DataItem, "PictureImage")),Convert.ToString(DataBinder.Eval(Container.DataItem, "DetailID")),Convert.ToString(DataBinder.Eval(Container.DataItem, "PictureID")))%>'>
其中：后台代码文件中ShowModalWin()方法的定义如下：
protected string ShowModalWin(string PictureImage,string DetailID,string PictureID)
{
return " window.showModalDialog(/"Customers/ShowPictureInfo.aspx?pid="+PictureImage+"&did="+DetailID+"&id="+PictureID+"/",/"/",/"dialogHeight:320px;dialogWidth:480px;center:yes;help:no; status:no;scroll:no/");";
}
或者将参数提取出来单独定义成一变量：
const string WINDOWPARAMSTRING="dialogWidth:540px;dialogHeight:420px;help:0;status:0;resizeable:1;scroll:no";
Page.RegisterStartupScript("functionscript","<script language='javascript'>window.showModalDialog('EditUserService.aspx?URID="+iURID+"','','"+WINDOWPARAMSTRING+"')</script>");

13.html字符转换的两个函数
public string Encode(string str)
{
str=str.Replace("&","&");
str=str.Replace("'","''");
str=str.Replace("/"",""");
str=str.Replace(" "," ");
str=str.Replace("<","<");
str=str.Replace(">",">");
str=str.Replace("/n","<br>");
return str;
}
public string Decode(string str)
{
str=str.Replace("/n","<br>");
str=str.Replace(">",">");
str=str.Replace("<","<");
str=str.Replace(" "," ");
str=str.Replace(""","/"");
return str;
}

14.产生62位内任意数字大小写字母的随机数
private static char[] constant=
{
'0','1','2','3','4','5','6','7','8','9',
'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u' ,'v','w','x','y','z',
'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'
};
public static string GenerateRandom(int Length)
{
System.Text.StringBuilder newRandom = new System.Text.StringBuilder(62);
Random rd= new Random();
for(int i=0;i<Length;i++)
{
newRandom.Append(constant[rd.Next(62)]);
}
return newRandom.ToString();
}
//调用
string str=GenerateRandom(6);//参数表示需要产生随机数的数目

15.图像加入版权信息
using System.Drawing;
using System.IO;
using System.Drawing.Imaging;

private void AddTextToImg(string fileName,string text)
{
if(!File.Exists(MapPath(fileName)))
{
throw new FileNotFoundException("The file don't exist!");
}
if( text == string.Empty )
{
return;
}
//还需要判断文件类型是否为图像类型
System.Drawing.Image image = System.Drawing.Image.FromFile(MapPath(fileName));
Bitmap bitmap = new Bitmap(image,image.Width,image.Height);
Graphics g = Graphics.FromImage(bitmap);
float fontSize = 12.0f; //字体大小
float textWidth = text.Length*fontSize; //文本的长度
//下面定义一个矩形区域，以后在这个矩形里画上白底黑字
float rectX = 0;
float rectY = 0;
float rectWidth = text.Length*(fontSize+8);
float rectHeight = fontSize+8;
//声明矩形域
RectangleF textArea = new RectangleF(rectX,rectY,rectWidth,rectHeight);
Font font = new Font("宋体",fontSize); //定义字体
Brush whiteBrush = new SolidBrush(Color.White); //白笔刷，画文字用
Brush blackBrush = new SolidBrush(Color.Black); //黑笔刷，画背景用
g.FillRectangle(blackBrush,rectX,rectY,rectWidth,rectHeight);

g.DrawString(text,font,whiteBrush,textArea);
MemoryStream ms = new MemoryStream( );
//保存为Jpg类型
bitmap.Save(ms,ImageFormat.Jpeg);
//输出处理后的图像，这里为了演示方便，我将图片显示在页面中了
Response.Clear();
Response.ContentType = "image/jpeg";
Response.BinaryWrite( ms.ToArray() );
g.Dispose();
bitmap.Dispose();
image.Dispose();
}
//调用
AddTextToImg("me.jpg","Family.Man");

16.常用正则表达式集锦
"^//d+$"　　//非负整数（正整数 + 0）
"^[0-9]*[1-9][0-9]*$"　　//正整数
"^((-//d+)|(0+))$"　　//非正整数（负整数 + 0）
"^-[0-9]*[1-9][0-9]*$"　　//负整数
"^-?//d+$"　　　　//整数
"^//d+(//.//d+)?$"　　//非负浮点数（正浮点数 + 0）
"^(([0-9]+//.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*//.[0-9]+)|([0-9]*[1-9][0-9]*))$"　　//正浮点数
"^((-//d+(//.//d+)?)|(0+(//.0+)?))$"　　//非正浮点数（负浮点数 + 0）
"^(-(([0-9]+//.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*//.[0-9]+)|([0-9]*[1-9][0-9]*)))$"　　//负浮点数
"^(-?//d+)(//.//d+)?$"　　//浮点数
"^[A-Za-z]+$"　　//由26个英文字母组成的字符串
"^[A-Z]+$"　　//由26个英文字母的大写组成的字符串
"^[a-z]+$"　　//由26个英文字母的小写组成的字符串
"^[A-Za-z0-9]+$"　　//由数字和26个英文字母组成的字符串
"^//w+$"　　//由数字、26个英文字母或者下划线组成的字符串
"^[//w-]+(//.[//w-]+)*@[//w-]+(//.[//w-]+)+$"　　　　//email地址
"^[a-zA-z]+://(//w+(-//w+)*)(//.(//w+(-//w+)*))*(//?//S*)?$"　　//url

17.绑定在DataList中的DropDownList
private void dlistOrder_EditCommand(object source, System.Web.UI.WebControls.DataListCommandEventArgs e)
{
//绑定订单状态
for(int i=0;i<((DropDownList)dlistOrder.Items[e.Item.ItemIndex].FindControl("ddlFlag")).Items.Count;i++)
{
if(((DropDownList)dlistOrder.Items[e.Item.ItemIndex].FindControl("ddlFlag")).Items[i].Value == dv.Table.Rows[0]["OrStatus"].ToString())
{
((DropDownList)dlistOrder.Items[e.Item.ItemIndex].FindControl("ddlFlag")).Items[i].Selected = true;
}
}
}

//另一种绑定方式，绑定送货方式
DataView shipType = OrderSO.GetShipTypeList();
DropDownList ddlShipType = (DropDownList)dlistOrder.Items[e.Item.ItemIndex].FindControl("ddlShipType");
ddlShipType.DataSource = shipType;
ddlShipType.DataTextField = "StName";
ddlShipType.DataValueField = "StId";
ddlShipType.DataBind();
ddlShipType.SelectedIndex = ddlShipType.Items.IndexOf(ddlShipType.Items.FindByValue(dv.Table.Rows[0]["OrShipType"].ToString()));

18.验证用户名必须以字母打头且不能含有中文
String sUsername = txtUsername.Text.Trim();
if(!Regex.IsMatch(sUsername, "^[A-Za-z].*"))
{
Utility.MessageBox(this,"nameFormatError","用户名要以字母开头, 且不要用中文名称 !!");
return;
}

operate.cs

   //获取数据表类，常用于绑定datalist等等调用参数如"select * from news"
    public static DataTable GetDataTable(string sqlstr)
    {
        SqlConnection con = newscon.creatcon();
        con.Open();
        SqlDataAdapter sda = new SqlDataAdapter(sqlstr, con);
        DataSet ds=new DataSet();
        sda.Fill(ds,"news");
        con.Close();
        return ds.Tables["news"];
    }

    //获得符合条件的元组总数，调用参数如"select count(*) from user where uname='changcan'"
    public static int GetCount(string sqlstr)
    {
        SqlConnection con = newscon.creatcon();
        con.Open();
        SqlCommand cmd = new SqlCommand(sqlstr, con);
        int result = Convert.ToInt32(cmd.ExecuteScalar());
        con.Close();
        return result;
    }

    //获得符合条件的某个数值（string)，调用参数如"select upwd from user where uname='changcan'"
    public static string   GetStr(string sqlstr)
    {
        SqlConnection con = newscon.creatcon();
        con.Open();
        SqlCommand cmd = new SqlCommand(sqlstr,con);
        string result = Convert.ToString(cmd.ExecuteScalar());
        con.Close();
        return result;
    }

    //获取客户机IP，
    public static string GetIp()
    {
        string clientip;
        clientip=System.Web.HttpContext.Current.Request.ServerVariables["http-x-forwarded-for"];
        if (clientip.Length == 0)
        {clientip=System.Web.HttpContext.Current.Request.ServerVariables["remote_addr"]; }
        if (clientip.Length == 0)
        { clientip = System.Web.HttpContext.Current.Request.UserHostAddress; }
        return clientip;
    }

    //获取日期时间编码+三位随机数ID
    public static string GetId()
    {
        string idstr = System.DateTime.Now.ToString();
        idstr = idstr.Replace("-", "");
        idstr = idstr.Replace(":", "");
        idstr = idstr.Replace(" ", "");
        idstr = idstr.Trim();
        Random rm = new Random();
        idstr=idstr+rm.Next(1,999);
        return idstr;
    }

    //检查符合条件的元组是否存在调用参数如"select count(*) from user where uname='changcan'"
    public static bool CheckExit(string sqlstr)
    {
        SqlConnection con = newscon.creatcon();
        con.Open();
        SqlCommand cmd = new SqlCommand(sqlstr,con);
        int result = Convert.ToInt32(cmd.ExecuteScalar());
        con.Close();
        if (result > 0)
        { return true; }
        else
        { return false; }
    }

    //执行sql语句，执行成功返回true 否则false
    public static bool ExecSql(string sqlstr)
    {
        SqlConnection con = newscon.creatcon();
        con.Open();
        SqlCommand cmd = new SqlCommand(sqlstr,con);
        int result =Convert.ToInt32(cmd.ExecuteNonQuery());
        if (result > 0)
        { return true; }
        else
        { return false; }

}

    //字符串去掉前面和后面的空格
    public static string DeleSpace(string str)
    {
        return str.Trim();
    }
    //截取指定长度的字符串
    public static string   TrimStr(string str,int len)
    {
        str = str.Trim();
        if (str.Length > len)
        { str = str.Substring(0, len) + "..."; }
        return str;
    }

//md5加密数据
public static string encrypt(string pwd)
    {
        MD5 mh = MD5.Create();
        byte[] data = mh.ComputeHash(Encoding.Default.GetBytes(pwd));
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < data.Length; i++)
        {
            sb.Append(data[i].ToString("x2"));
        }
        return sb.ToString();
    }

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