<asp:Repeater ID="rep_allnews" runat="server">

    <ItemTemplate>

        <tr>

            <td class ="number">【<a href ="NewsList.aspx?id=<%#Eval("CategoryId")%>"><%#Eval("Name")%></a>】</td>

            <td><a href ="NewsContent.aspx?=<%#Eval("ID")%>"><%#Format(Eval("Title").ToString(), Convert.ToInt32(ConfigurationManager.AppSettings["StringLength"]))%></a></td>

            <td class ="time"><%#Convert.ToDateTime(Eval("CreateTime")).ToString("yyyy-MM-dd")%></td>

        </tr>

    </ItemTemplate>

</asp:Repeater>

<appSettings>

  <!--截断字符的长度-->

  <add key="StringLength" value="6"/>

</appSettings>

/// <summary>

/// 截断字符串

/// </summary>

/// <param name="s">要截断的字符串</param>

/// <param name="len">要保留的字符长度</param>

/// <returns>截断后的字符串</returns>

public static string Format(string s, int len)

{

    if (s.Length > len)

        s = s.Substring(0, len) + "...";

    return s;

}