asp.net DataBinder.Eval限制显示的字数

前台：

 

<%#getString((string)(DataBinder.Eval(Container.DataItem, "title ")),20)%>

后台：

protected string getString(string StringInput,int StringLength) { if(StringInput== " "||StringInput==null) return " "; string tempTitle= " "; if(StringInput.Length> StringLength) tempTitle = StringInput.Substring(0,StringLength)+ "... "; else if(StringInput.Length==StringLength) tempTitle = StringInput; else { for(int i=0;i <StringLength-StringInput.Length;i++) { StringInput = StringInput+ "  "; tempTitle=StringInput; } } return tempTitle; }