常用代码 - 走看看

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常用代码
1、在数字统计中，经常会遇到类似67.666666%等的显示问题，其实我们想要得到的是67.67%就可以了，但是我们用

val.ToString("F2")的话，那么100%就会显示成100.00%,不是很好看，怎么办呢？

以下介绍一种方法：

Math.Round(参数列表)方法

//实际得分占标准分比例
    public string getPercent(string text1, string text2)
    {

         double t1,t2,result;

         try

        {
                t1 = double.Parse(text1.Trim().ToString());
                t2 = double.Parse(text2.Trim().ToString());
                result = double.Parse(((t1 / t2) * 100).ToString());
        }

         catch(Exception)

        {

             ClientScript.RegisterClientScriptBlock(GetType(), "", "<script>alert('字符格式不正确');</script>");

              return;

         }

         return Math.Round(result, 2, MidpointRounding.AwayFromZero).ToString()+"%";
    }

2、很简单的一个倒计时，进入某个页面的方法

其实重点的就是利用JavaScript里的一个setInterval函数，下面写下该简单的额js脚本

<script type="text/javascript">
        var time = 10;
        function count() {
            if (time > 0) {
                document.getElementById("dzsj").innerHTML = time;
                time--;
            }
            else if (time == 0) {
                window.location.href = "CompanyNews/gsxw.aspx";
                clearInterval(timer);
            }
        }
        timer = setInterval('count()', 1000); //第一个是函数，需用' '引起来,第二个参数是毫秒值(11000
    </script>

<div>

        系统将在<span id="dzsj" style="font-weight: bold; color: Red;"></span>秒内跳转到公司新闻页面！

</div>

3、定时页面跳转

ClientScript.RegisterClientScriptBlock(GetType(), "", "<script>alert(/'响应启动成功!/');setTimeout(function(){location.href='URFeedBack.aspx'},1000); </script>");

4、鼠标经过时弹出图片,移出后消失的简单效果代码：

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html xmlns="http://www.w3.org/1999/xhtml"><head runat="server">    <title>无标题页</title>    <mce:script type="text/javascript"></mce:script></head><body>    <form id="form1" runat="server">    <div id="Image" style="position:absolute;100px;height:100px;border:1px solid red;display:none;"></div>    <div>        <asp:DataList ID="DataList1" runat="server">        <HeaderTemplate><table></HeaderTemplate>        <ItemTemplate>            <tr>            <td><span onmouseover="showImage(this)" onmouseout="hideImage()"><%#Eval("Path")%></span></td>            <td><img src='<%#Eval("Path") %>' /></td>            </tr>        </ItemTemplate>        <HeaderTemplate></table></HeaderTemplate>        </asp:DataList>    </div>    </form></body></html>后台cs代码protected void Page_Load(object sender, EventArgs e)    {        if (!IsPostBack)        {            DataList1.DataSource = getDataTable();            DataList1.DataBind();        }    }    public DataTable getDataTable()    {        string[] name = { "images/p002.jpg", "images/p003.jpg", "images/p004.jpg" };        DataTable dt = new DataTable();        dt.Columns.Add("ID", typeof(System.Int32));        dt.Columns.Add("Path", typeof(System.String));        for (int i = 0; i < name.Length; i++)        {            DataRow row = dt.NewRow();            row[0] = i + 1;            row[1] = name[i];            dt.Rows.Add(row);        }        return dt;    }

html xmlns="http://www.w3.org/1999/xhtml"><head runat="server"> <title>无标题页</title> <mce:script type="text/javascript"></mce:script></head><body> <form id="form1" runat="server"> <div id="Image" style="position:absolute;100px;height:100px;border:1px solid red;display:none;"></div> <div> <asp:DataList ID="DataList1" runat="server"> <HeaderTemplate><table></HeaderTemplate> <ItemTemplate> <tr> <td><span onmouseover="showImage(this)" onmouseout="hideImage()"><%#Eval("Path")%></span></td> <td><img src='<%#Eval("Path") %>' /></td> </tr> </ItemTemplate> <HeaderTemplate></table></HeaderTemplate> </asp:DataList> </div> </form></body></html>后台cs代码protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { DataList1.DataSource = getDataTable(); DataList1.DataBind(); } } public DataTable getDataTable() { string[] name = { "images/p002.jpg", "images/p003.jpg", "images/p004.jpg" }; DataTable dt = new DataTable(); dt.Columns.Add("ID", typeof(System.Int32)); dt.Columns.Add("Path", typeof(System.String)); for (int i = 0; i < name.Length; i++) { DataRow row = dt.NewRow(); row[0] = i + 1; row[1] = name[i]; dt.Rows.Add(row); } return dt; }

5、地址栏中传递int类型参数，为防止用户非法修改参数的一个解决办法：

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int type = 0;if(!int.TryParse(Request.QueryString["type"], out type){    Response.Write("不合法");    return;}

int type = 0;if(!int.TryParse(Request.QueryString["type"], out type){ Response.Write("不合法"); return;}

6、限时抢购代码

团购倒计时抢购功能（JS代码） JS代码如下：
<SCRIPT LANGUAGE="JavaScript">
function _fresh()
{
var endtime=new Date("2010/11/05,12:20:12");
var nowtime = new Date();
var leftsecond=parseInt((endtime.getTime()-nowtime.getTime())/1000);
__d=parseInt(leftsecond/3600/24);
__h=parseInt((leftsecond/3600)%24);
__m=parseInt((leftsecond/60)%60);
__s=parseInt(leftsecond%60);
document.getElementById("times").innerHTML=__d+"天 "+__h+"小时"+__m+"分"+__s+"秒";
if(leftsecond<=0){
document.getElementById("times").innerHTML="抢购已结束";
clearInterval(sh);
}
}
_fresh()
var sh;
sh=setInterval(_fresh,1000);
</SCRIPT>
Html代码如下：
<div id="content">
<h1>限时抢购啦！</h1>
<p>还剩<span id="times"></span></p>

</div>

7、字符串中中英文字符区分方法：

方法一：

string str = " 放不开放不下taken in and fetch off " ; string str1 = new string (str.ToList().Where(x => ((x >= ' A ' && x <= ' Z ' ) || (x >= ' a ' && x <= ' z ' ))).ToArray()); string str2 = str.Replace(str1, "" ); 方法二：

string rule ="[/u4e00-/u9fa5]+[a-zA-Z//s]+";

System.Text.RegularExpressions.Regex reg =new System.Text.RegularExpressions.Regex(rule );

string str="放不开放不下taken in and fetch off";

foreach (Match m in reg.Matches(str))

{

    Console.WriteLine(m.Value);

}

8、WPF中定义TabControl的样式： < Window x:Class = " CaseAnalysis_WPF_.Window1 " xmlns = " http://schemas.microsoft.com/winfx/2006/xaml/presentation " xmlns:x = " http://schemas.microsoft.com/winfx/2006/xaml " Title = " Window1 " Height = " 300 " Width = " 300 " > < Window.Resources > < Style TargetType = " {x:Type TabItem} " > < Setter Property = " Template " > < Setter.Value > < ControlTemplate TargetType = " {x:Type TabItem} " > < Grid > < Border Name = " Border " Background = " LightBlue " BorderBrush = " Black " BorderThickness = " 1,1,1,1 " CornerRadius = " 6,6,0,0 " > < ContentPresenter x:Name = " ContentSite " VerticalAlignment = " Center " HorizontalAlignment = " Center " ContentSource = " Header " Margin = " 12,2,12,2 " /> </ Border > </ Grid > < ControlTemplate.Triggers > < Trigger Property = " IsSelected " Value = " True " > < Setter TargetName = " Border " Property = " Background " Value = " Red " /> </ Trigger > < Trigger Property = " IsSelected " Value = " False " > < Setter TargetName = " Border " Property = " Background " Value = " LightGray " /> </ Trigger > </ ControlTemplate.Triggers > </ ControlTemplate > </ Setter.Value > </ Setter > </ Style > </ Window.Resources > < Grid > < TabControl HorizontalAlignment = " Left " Name = " tabControl1 " VerticalAlignment = " Top " Height = " 311 " Width = " 491 " TabStripPlacement = " Left " IsTextSearchEnabled = " False " IsManipulationEnabled = " False " Margin = " -2,0,0,0 " > < TabItem Name = " tab1 " UseLayoutRounding = " False " Background = " #FF41DBF7 " Width = " 25 " Height = " 60 " BorderBrush = " Black " Margin = " 0 " > </ TabItem > </ TabControl > </ Grid > </ Window >9、后台找前台html控件： System.Web.UI.HtmlControls.HtmlInputCheckBox cb = row.FindControl("checkboxItem") as System.Web.UI.HtmlControls.HtmlInputCheckBox; 10、数据绑定类型

（1）将HashTable数据源输出成一个数组，将该数组绑定；

（2）直接绑定，但是要指定DropDownList的Text和Value分别为HashTable的Key和Value。

   例如：

  Hashtable    ht    =    new    Hashtable();       for(int    i=0;    i<10;    i++)       {       ht.Add(i+1,"Item"+1);       }       this.DropDownList1.DataSource    =    ht;       this.DropDownList1.DataTextField    =    "key";       this.DropDownList1.DataValueField    =    "value";            this.DropDownList1.DataBind();

关于DataList与HashTable数据绑定其实也挺简单，只需将HashTable的Key或者Value与控件绑定即可，例如：

  Hashtable ht = new Hashtable();          //对ht赋值    this.DataList1.DataSource = ht.Values;    this.DataList1.DataBind();
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原文地址：https://www.cnblogs.com/xuexian/p/2250603.html