GridView表格列数据字符截取

<asp:TemplateField HeaderText="工作内容" HeaderStyle-CssClass="Style_Css" ItemStyle-HorizontalAlign="Center">
       <ItemTemplate>
          <span style="padding-left:5px;" title='<%#Eval("ProjectPlan_WorkContent") %>'>
               <%# (DataBinder.Eval(Container.DataItem, "ProjectPlan_WorkContent").ToString().Length > 30) ? DataBinder.Eval(Container.DataItem, "ProjectPlan_WorkContent").ToString().Substring(0, 30) + "……" : DataBinder.Eval(Container.DataItem, "ProjectPlan_WorkContent")%>
          </span>
        </ItemTemplate>
        <ItemStyle HorizontalAlign="Left"/>

</asp:TemplateField>