ASP.NET 前端html代码中会经常出现的<%%>的代码,里面的文本其实就是不能直接输出到客户端浏览器的文本,是需要服务器解释的。

在ASP中,<%%>里面的文本是vbscript或者javascript代码,在ASP.NET中,<%%>里面的文本就是.net平台下支持的语言。

具体有三种:<%%>,<%#%>,<%=%>,后两种主要是用于asp.net前端数据绑定的。

一 、<%=%>

在.aspx页面,<%= %>标签可以调用后台.CS的变量/属性或者方法,不过被调用的变量或方法必须是public的。
例:Default.cs文件里面有:

public string str = "test";

public string ReturnStr()
{
return "test";
}

那么前端Default.aspx文件里面就可以这样写:

<asp:Label ID="Label2" runat="server" Text='<%=str%>'></asp:Label>
<asp:Label ID="Label1" runat="server" Text='<%= ReturnStr() %>'></asp:Label>

二、<%#%>
前端aspx页面中,一帮服务器控件数据绑定的语法,结合Eval()方法绑定数据源(ASP.NET 提供了一个名为 DataBinder.Eval 的静态方法,该方法计算后期绑定的数据绑定表达式,并将结果格式化为字符串(可选)。利用此方法,可以避免许多在将值强制为所需数据类型时必须执行的显式强制转换操作,DataBinder.Eval需要使用参数来指定容器)

例:Repeater控件,在Page_Load()方法中,加载数据:

后台:

    protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
intopage(DropDownListMgrDate.SelectedValue.ToString());
//不会每次刷新页面都重新绑定数据
} }
    private void intopage(string Batchid)
{
this.Repeater1.DataSource = dmgr.GetCBProduct_MgrList(this.AspPage.CurrentPageIndex, AspPage.PageSize,Batchid);//CurrentPageIndex:当前页索引值;PageSize:分页每页所能容纳值
this.Repeater1.DataBind();
}

这里,Repeater1.DataSource的数据源既可以是DataSet,也可以是List,这里是List,对应前端DataBinder.Eval方法的参数是:ColumnName/属性名称

前端:

                        <td>
<%#DataBinder.Eval(Container.DataItem, "include_in_quantity")%>
</td>
<td title="<%#DataBinder.Eval(Container.DataItem, "part_description")%>">
<%#DataBinder.Eval(Container.DataItem, "part_description").ToString().Length>20?DataBinder.Eval(Container.DataItem, "part_description").ToString().Substring(0,20)+"...":DataBinder.Eval(Container.DataItem, "part_description").ToString()%>
</td>

这里Eval()绑定数据时结合使用了三元运算符,如果字符长度大于20,就截取+“...”,当鼠标滑到目标处,就会显示。

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5jfvSIfdf2zpxCNTub2RZ49e27ttXYup5AfSJUoyivqNoFa+nevrt05ixVszgU5hEq+/6///hBH+6r1+dWLV69Po9a9fbdpdoIEY/itY7SZqxxkWvVrPd/Pzqtev/xQ7GlOasUS1qk3C6m5lTNlkJStjmMNXx9e2czoBVyfXuntWprXmtgdjarpTw9EwqVfFXYJ+uEyj44hOqIKEZBW4a+frZ9KFO9ZofCnELVm6fpxKaoAe7R6yUNobq+vXv1+tw1pHj+5z++2IzJybF7tIZQSSeyaM4aQiV/1tq5012b7evbO1sWLbhNzer93plQqN6+uxStsl1qK1T2IwahOiJKm9CPaH3/o13rl78N4UimFSp9mlE8oqWWEa349BtC9f7jB/nJilxbXa6+fZdMRoO+Xo8qXqjZaAhV/ETT7NVuqm+NZltzKBrmHkcGJhQqqXn7yJxQ2ZFhhOqIKK+oDndYoYpWKdVrdiicXqiKEyobClW/PF2kScU5Kjsxozdyn0FCnTGyg5By39ihLwqVZc1mjRQql1oxqVp/SI/bE7Sw9l6p3qBsQmVtjlZaFCqZGqw92YOrT4RqFNVIff7ji3z60aPaLtP2qNSqRqEaHOPV3lWtR2UXGlgBixqglihqj015yh5VbXyvuF7DViw9qk3olrpIRUWh6v9+fPvu8u27S4TqiGhfURkAZI5qu0wrVOPnqBrJ1oTK9cnU9MfztaW5zyBZVaF/TilURTkpvhFv3126TOqFurDCVkWqT71UQmUXZ/ZmlLUoVPJ/V/l7J0K1Q8b1Tqz62y5zCpWVgTH9CbcUcHY2ayymkGUU9oj01/uFAbKX6NCfkwFdX6cpTNmjioUqKr07YnNVrPlUn3qphEqWUbjq/fzHl5pQSZc9lUVCqHbI+C1p33/2UW3OPEJVm9EZ3EUUT7O98DglJsMy7nLVtr60j8qt/RNKUvL/wTmqrrKmfI05quLonJugimOb2j11o502q/HjoDaBNwHzCJVd1m9rWHS9KFR9vk9nhAoeMPOYA1jkCXha2FdDQqjgAROhSs6Tk5P5vIdPg4cnVDt1eQsAeBpAqJ4ST04OzPLTo4IpOJ/To0pNESoZNVJj5xCPt22lPa2Y1MKkli8snhPTqaVcMd+j0hlTqFgh7SKMT7l9xD2mWmr7akjrvekIFUxBhCo5rTVc4z9tSWhc5VIYPEct9Ur5icZ9vXTGlGXMkVUTd/qEUB0p8Z6+a2YQqtnZrOgRfPql0q6ByZ/qx2uLKY/n7oSqYbWdzW2kVtOzRspjcjVGJkeKCkIlRKh2SLyn75pJhCp6ld3Lnh7bwFxEjy2mvBLbI06rClVNXRrdmlXlrZ3y2kK1XjqrSlejxtzJ7kEgVEdNvKfvmkmEym47lQ25zles3foj/RtxaaOOtewGI91FZN30iVsT90FTc3LhVEp7VNog7a4jdTMot1BvTHYnlv7pSiRllPRdMYXb7VEV7fJghyOK5XihWjUzjXQGk2qns2GPqnFyo0IQqqMg3tN3zSRCZb88xK+5CpVuxVW/NaJD+qv1xdcvOxHXPblWn9S7XdzGq/4muoorPxFIOah50P/IWPT17Z1uv3XKpxlolMjuI+53JlTtk13vrWij3TltgdmLUDX+XEOoGtlAqI6deE/fNfMIlXqpESGRg8V4UXbGyHpkEJEoul61Lk40wEf0i2PdNBSjtTrnk+JEx3XRJA+Nvlq7RG4+bLtCVZOcrfxnWwKzlXTG9K4QqkEiVKOI9/RdM49QSf9GHfGpUDlXQINC5ZwJRaHSW8RJI9uXqg39OaFyuqIDd26EsDZqLf6cBoXKdlxOAuLxhqFsXFW718j/D6bczlLtyJhEilLUKGzj7o3s1Up0glAdOfGevmvmEap+EZ5DZKbYoxJu2KPqFy7D47eOHaCT4Tg7K9aP7lG50umoQL9Bjwo+ASJUT5N4T981UwmV9ELE0Mc5qn4xG9QWqtoclfNubJNVurV52sYaQtU356i0IINzVAjVMRCheprEe/qumUqoNNxGv9w/divo2kLVV1b9tYNa1Y7LYo22ULlVf3qha5lyxK0JtKv+5DSE6gkToYJwHWYQqum5o3U3xYHKDYlQPSUiVBCuwyMUKjvAuDld6Kmt5xahekpEqCBch0coVIfFE/C0sK+GtKZQTeOkHQAAAFgP9KhgCs7pUcGUpGVmqE+ECqYg5gDmJC0zQ30iVKNImI9dc6fm4O27y7i57dXrc/uwdBl3XIlgt9zqtc5RRb/cDKwziNpxpVsHoQ5ho68/XSXo0nQ7+Wo/2RvZ45ps7Y7RMUds6rX7xrqyNVl8d2KNdfsItjJBy9yEs7OZXTJql3pucZFOkvpEqEaRMB+75q6FysWakp22dueTdVPktEqeqb3cbYfSNItrzQfXoLd3U7lPIhUqm6YUp5g33WssYqPm3qqvE6riHfWqWvOu3TfuQbSbz9rvjnNDtRfmFCpxRGKfFEIFCfOxc+5aqKwp7xdfo2IEo5BY+yge+YpOad1ddiRU6rO/rwtVv+xWo+hwPTbLmFrjji61yNp9a3ucx7w7CFWN0s21dYtQQcJ87JwTCNWr1+fy9op7PTWCokO1a9XHubWhUwqV+uzvm0KlrS72bN5//FC8hbr7c0JVvKNwpR5VMT/aoxrz7iBUNTqXWj1CBXvCfOyeEwjV5z++yMMST+FqBNs9YLXv9rG6eRcxxHFmpX1cGeeonKdz7Q6OFKpiUrH7Er+3GncUtoWqOA9XnM/rx707CFWRtupUkxAqSJiPnXMCoVJjLf+O6VGpsz63EGDKHpX8XybJGkJV68E0blHrURXvqBUyskcVj9uOWq1a6FGNoV340y0iSiNUkDAfO+cEQtUvjK+Y2vYclS4EsI9Sl1RML1Tyf83Y+DmqeELMWFGo3B2FmwhVv7yCgzmq9ejiuajne4QKEuZj55xGqGQUTuPqNlb9yepw9yjVq/r0QqWZr636s0NtRcEYv+qveEe9ahOh6pdfEFb9rcEYD1rc6iNUkDAfO+c0QqWLBfpgBOMkikxluaQ01kZRqNw4oQ6sFY8ri/uoXOwovXtxH5W17zXBcDdq7KMq3lG4uVDJLYpbpuK7455RbYiyVt6tMJVQFeca5fvJCVVjTnS/RKjgATOVOYBQScvMUJ8IFUxBzAHMSVpmhvpEqGAKYg5gTtIyM9QnYT4AAACkBj0qmIJzvlthStIyM9QnQgVTEHMAc5KWmaE+EaoqdVevPaLbaNwCUF1Ea39Ku5UhIfdlDtxOA6H6UOgqUTaUbj+sugzQq6QVud1IxWXl/fKqYrekW1ce2/XcdhO6/N/G42iUWneJurvbX2NmtCzSttuxP9xeaVnWr386lx97efQjmVOo2jE+7Jr+xo6CQ6nPq2/fEaoWrRvpMVs37LaPoi2ANe7RHDgb2i87cnUb5px1sApkTbOYcmsjtM1YL0HqiMHtxu3DHmS5iwusFbfI6OdR2zyJoLoLi81V9zg7sRzcXBU3GlrxtpuBYlyVVEwoVIMxPuxX8qELlTQPhKpF653MeVEa46Vm11sRnxL3aA7UFivFBAzGvJCvWt2CGndiWlqnsdpIGg76VJz0krgbV81TvLyRHymF6z/V1ELbv82P834UTaE9WXLiPP65u7Qd2O+XCYVqMMaH9fFx6EIlRhWhGqA4p3EPu9GjwjnFetyvObBfGKoo7ZgXcpoekRaiA7/R7OotxKmxJiKXt7sU8qu1/o6xQdb8NolsRLUo6of1zGQ7gu7kaAqtUw8RIevW+bBiCyQUqjExPrQLe9BCpd9bCNUwZZykHYlcf7UD94f1Qu6X+zUH1qzrC9+IeRH9jkuPxA39yf/lp6IfNrnc2X2d6JJL1Alpw2egE6qaWPb1zllRqKx+v10OJtkWKhVjlSU78ml7Zg3/SUmYTahGxvjQLvJBC5WWC6EaZnzSI8f0Mr9+2bh3c6ALBIrm2MW80KEq16PS1IpDeRpkZEyPSl9RNUwr9aj6xaidflRJRK6aT7/GuKJmdaRQ2VHHOK1bLEUG57M17r1lOo6P8SHj0gctVPSoVuBIoYqv+qDbbKjcuzkQQ6xRgPtmzAvXn9Y5A02tOGkkqdn5mPeVsLz98vyTZKmoJZpmbJDxoF2251ZPDLbeOO1kf7Jl1wCVxdWDxa4bQjWSq8b4kMZ5uELVM0c1nuN7VHbivS8tJ4M1ZjAHbrR2MOZFH8YM7dBfvzzHUxzBc6v+3PCd9L2sJMRVf1bnrG/4frnr5jimR1X0eh5L3Zd6k3HU0abmNn7IIBVCNYarxviQuj1ooWLV3wo1FYUqflPHn1Cp8cxgDmRJuv45GPOiDyZbH72d2rETTppsN24fVRwos72i9j6qxjq6MUIVAy3W9gi6F6S4MMTJXm0fVZzKqgXrmowZWqY+o5ExPtyE+kELlZQRoYIpmMccQGhJy8xQnwgVTEHMAcxJWmaG+kSoYApiDmBO0jIz1CdhPgAAAKQGPSqYgnO+W2FK0jIz1CdCBVMQcwBzkpaZoT4RqioJ8zEl92sOGsE+ZCG1e5TRj61zll+M7iG0u+tc4Aw9x7Yil4LuUiouc7crxW37LC5Vj0FJimWJd6m5PpK82aXnet/r27uiQ4r8O+JzCtVRhfnoEao2CfMxGfduDmrBPsQEWFmS7SxOqGzgDOttyDUVG/CiFjgjWn+3VatftC7Vtuh9wLkwiIxBSQbLojurnFjavNkj+gpI9kR9nVdMhGoNHlWYDyFC1SJhPibj3s1BLdiHmADrEUBExfnBs/3vmksIF/CiGDgjut2yehZ9vCql7alVajspHx8EpBiUxJpIbfPFO1rvtFHa6VGtx6MK8yFEqAZImI9pmMEcFIN9iAlQ/3V6mvU0YQNnyH80Dm8cGStGUCx6AozU8Bm1zro2VPH4HvNgT4tBSWIQkOhC14mcFseG9lCq2GvZbfUehDPMDC3T8XjCfCgRqmES5mMCZjAHxWAfagJs0A1rF1zgDBUq/dX1n6xlj0LlImu4Biay0fAqpFZJ3L1ruaIr964UlCQGAelCUBLnVV2LE/uRNVezMUhKZmZomZZHFeZDiVANkzAfEzCJOehCsA/rxVyOWx+gMXBGdGXrAnms0aOSXBXDZzgWrZLkQdc4SAcxjhAUg4CM7FHFscR29KwYiDItk7RM5VGF+VAiVMMkzMcETGIOYrAPp0liuPVgMXBGFKpiwIti4Ixim9Fv5NoajX6xGKQhVPZIMShJsSzFoCS2gLrSz36TtUNLuLskf0eStMzigzuGMB9ChGqYhPmYgHnMgTOdagLkQ0Raghv+6pc/U+yQV+whaeOpBc5wGdDFcjapuOrPzVu4IcTYS4tBSYplKQYliUWweYs+5ms8iC+5PC2zP8owH0KEapiE+ZiAecyBC/bhpqPsCgt7letPvzJxdV36bvlonOZ0x62A2XRsL629j6rWDvUEZ/tixMh4Fz3o+lgufkdM3FW1fXGyBfjok7XMow3z0SNUMAnzmAMILWmZGeoToYIpiDmAOUnLzFCfCBVMQcwBzElaZob6JMwHAACA1KBHBVNwzncrTElaZob6RKhgCmIOYE7SMjPUJ0JVJWE+puTE5kB98bm118Xdkboq3a7VtuvOa/EynPu7uM67X+wjjvmRxuOOF9fExzT7sExcj9tF7baAMf0YqWTD6B612uuXtwBn29SRU6iefJgPt/0coWqRMB+TcXqhKm41lW8R+56Ld1c54jbJupgX/fIWFnnTtJ0U42X0CzFz+VFf4+64ZEb+34j04Zy7q9s3m0PrvlZvoe7Mi5FKNozuUaw9OdnutcqmVQmF6hjCfDhHkQhVi4T5mIx5hMqKQb/4dI37dkVgavEy5CrXZmK8jH6xVdblR+1+zGd0D+F+Ku6TjQ4yijlXDz3FSCU22bWje9jaK5aiHaBkeiYUqmMI84FQrUbCfEzDVEKlvv6uvn2XTkbRwYTGf4rxMvQcbSfRu2tvhCH2qIrH+4rDPcuRhr5YAw3ZfZ0AAAmgSURBVHJtMVLJVqJ7uNprlCIPEwrVMYT5QKhWJmE+JuDe56hs6A11sSpWOAqVjU/YleJlCK1QdSFeRm9UJ+bHnWlzLk6eaibeXlKbVSrKqmayGKlk8+gesfZcKXSqrxbUcS/MJlRHEuaDOaqVSZiPCZiqR6W9B3WRbp+jNQrtrvZgj2ow4EU8Xgyza1nsURXFw2mVjuYVI5VsHt0j1l6xFNGP4n6ZTaiOJMwHPaqVSZiPCZhKqPrFSj9dCqjvjF2Y0FfiZRT/LMbLUOMyXqjac1QiHtH610YvbYfPLVCMeXALBVeN7hFrr1gKhKrB4wnzgVCtTMJ8TMBsQiVjcS4Ur1tNJ2zEy7DtJMbLsF2fkUKl2tnXI330YWeFyIMOGOolGlsrDgMWI5VsGN2jWHtyd6eRCFWjDo8kzAdCtTIJ8zEB9z5H5Ub5rE3X8UB3iZ0qGFxMEfc82WUIDaGyd3TtsBjpQzhmH5XKT6wHe9z1Ju1BTXkwukej9mwFdssL+mO8j+lX0uYRqqMK84FQwYzMYw4gtKRlZqhPhAqmIOYA5iQtM0N94j0dAABAatCjgik457sVpiQtM0N9IlQwBTEHMCdpmRnqE6GqEu/pUzKnOZDFbKs+xzW2WNa8ubufas6KIu3qPrtkzi3tG0ynePcNNwge1quRqmUW9xL0ZtlkfLLFXQEHV58IVYt4T5+MqcyBUpb2TuBepGb6neZ1wdF4Q2Bctote0tvp1O6OUO2Lsns3+i+2e8mdLM3OZs5Z9iHWJ0LVIt7TJ2MqcyC8vr2TDa3FKE1qwWUXne1zqH0Xm6Idbu3QxFYxuAHZnab7ZGtCVfQVq1QHB+10infXLVOSE+uTTeTHeunVWtJ9VHI+QrUeZY+2fVjR54g1O+I6JJWLHIRqJ8R7+jRMZQ6E4p22N98fVrS0Dag51j3CVqhsjCg1FnH0ptGjipt5lQ3XtK9en6tTuPg17fwB1tKp3V1za98LddUjt3Yl1TqUsUSEag2qw6qaD8lIiQPQaCeHUp8I1TDxnj4B85gDpb7bzkWC+0axSiAdDitUbe/pypo3d722OAPRMEA2Vxq1xP5qj7QNWbx7LURILHXR8zpCtR5tlC/boa9VpnUMmGd0B6HaFfGePgHzmANh9AmkNsId6ZYd7kk/rChUllGoxnzWOHc4VmA0Y3Hm3DXXOGMx8otb725zG11DRaFyb1C7E5CNSVqmWx1ju6q1ynSRMpIsqUCodkW8p0/AJOZA+Wo5JG5cUqH+YdfoUUXWmooTFdc1GS8wNS/p7XRqd7fxtKxS0qPaHd2ko44kF+eoioFgioPAh1KfCNUw8Z4+AZOYA6Eso7BHoutPG/zCDgy6OSptAHaOqih7Nae0binHmLmlGJCwr69sbqRTu7vm1lrJRo+qN+8Cc1Tr0fWHdFFxXPXXLeIlujbmGs9h1SdCNUy8p0/AJOZAWFwyJ6ZWJ5PsegEdYxF7URSq3rSNaC9q3tzdT+7CRo/KjhTpYrzaQFA7XnC8uyQuU1+2tXeL2B9RqOKqv+J+j4SDEBlaZtxs0JvPHfsU9LHGIUEX5OWw6hOhgimYwRysxwwvP9wdD7dl5iRCBQ+Yh2sOEKqnzcNtmTmJUMEDJuYA5iQtM0N9EuYDAABAatCjgik457sVpiQtM0N9IlQwBTEHMCdpmRnqE6GqkjAfU3JKc2CX87qHZTfzN9ZJ65aU6C9AlllrOi4R2zxq6cdrx+yF0MbW8F7RLzYyt8/pS9tL9dZFP1L98uawWCG9cQZYvMo+lFT+XHIK1exsZtuP3eHnKnCNoDMJ6xOhapEwH5NxeqEq/jTGu4882aKzOzEW1jQ4rxDWgrjt4ZpIwz+b3QpTa2yiXnqhK6xudWqcI7Jko0/Z7zDZTOZsnxrKuK3YivfsbObcsesR6wUjiQ+FfvKWOZLyqWEfmRMq++HyBITq+vYOoRqooI4wH5MwiVCN+baQj9moMUXzqlY+bmW9vr1ru1+L2zxtr6XW2DTKRiysOk1vnCOlG/TP7QqrPbDY5vWmoqy2yHKv2H9qxyiZmAmF6u27S9EqrSUnVLbH/ASE6u27S4RqgIT5mIYZhEqUIzpusBTxKLo/L5oDlRPnPHAMo6u92O8pOiyQ5modO+klVk6K59hE9Cf1T6G3c35prZWsFUc0SV25X337LnpfLAI9qgZjx90JlR2efQJCNTubIVSjqqkjzMeOud85KnmTdeyuL7n7641FjkIVXZKLSyHr0sb6rm1PZLpr9Spn04uNTTRGBwNcb0ndKdXOsYn0RqiKx+WgBu6KPgat6qtreUlNVDMW6gkY1p3S9rO1/UShUo9WT6A+u2cdQjVMwnxMwAw9qniOlTQN+NsHoXLewS1V/Iq9BE22uIjACmc/5AKjM3GE9VPaBoS1/Z7aOcqiILmCq8bYtyNWrFaOnK/ZsAfH1OS+mE2oVP7tB0oUqn6x5OcJCBU9qlEkzMcEzClU7mBt9V3jQWs6xXPa2mPzMBjgQ9N3k6m6eNW6066do3RrQOJd+oXyOS/d8dVwQtUvZtrknbJCpZ2AVEwlVDYWYm9Gg4tC1S88Jh+6UDFHNYqE+ZiAGYTKWmGZQaml4FTHtQc7X2UtixsNlo6UE6ratVHnao3NZkZ7hP1yl652TrFEVktcvzAqnJhOF57YCZXMeOlSQB0JzNaX6idvmYOUZRT2iDz3mlCJ9h+6ULHqbxQJ8zEB976PSt5/nT1qv9tONuIElabjjO9K+6hcLKjiooPY2KJqipZYRamdUzuhNjh5fXtXHNy2FRsFLy6yj0/EDWNqhY+MFblF5hGq4jLRGCmtCxPqhy5UPfuoYBLmMQcQWtIyM9QnQgVTEHMAc5KWmaE+ESqYgpgDmJO0zAz1SZgPAAAAqXEy/787CCGEMC0RKgghhKmJUEEIIUxNhApCCGFqIlQQQghTE6GCEEKYmggVhBDC1ESoIIQQpiZCBSGEMDURKgghhKmJUEEIIUxNhApCCGFqIlQQQghTE6GCEEKYmggVhBDC1ESoIIQQpiZCBSGEMDURKgghhKmJUEEIIUxNhApCCGFqIlQQQghTE6GCEEKYmggVhBDC1ESoIIQQpiZCBSGEMDURKgghhKmJUEEIIUxNhApCCGFqntz86xxCCCFMy5M5AAAAkBgIFQAAgNRAqAAAAKQGQgUAACA1ECoAAACpgVABAABIDYQKAABAaiBUAAAAUgOhAgAAkBoIFQAAgNRAqAAAAKQGQgUAACA1ECoAAACpgVABAABIDYQKAABAaiBUAAAAUuP/ATLNyJbcdyRxAAAAAElFTkSuQmCC" alt="" />

其他优秀博客链接推荐:

http://blog.csdn.net/lai123wei/article/details/7261701

http://www.cnblogs.com/luckeryin/archive/2012/12/13/2815823.html

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