AjaxPro的回调函数不能被执行

 
 function tellPoint()              
 {   
     var flag=0; 
     Default2.displayRst(flag,callback);  
 } 
 function callback(response) 
 {　 
     if(response.error) alert('数据传输失败！')  
     else 
     { 
         document.getElementById('TextArea1').value+=response.value+"\n$"; 
     } 
 } 
 

[AjaxPro.AjaxMethod]
public string displayRst(int flag)
{
……
while(flag==0)
        {
            foreach (FileInfo fi in dir.GetFiles())
            {
                if (fi.Name.Substring(fi.Name.LastIndexOf(".") + 1) != "zip")
                {
                    flag = 1;
                    //显示文件内容
                    switch (method)
                    {
                        case 1: myResult = this.ReadIni(fi.FullName); break;
                        case 2: myResult = this.ReadSort(fi.FullName); break;
                        case 3: myResult = this.readWebSite(fi.FullName); break;
                        case 4: myResult = this.ReadFile(fi.FullName); break;
                        default: break;
                    }
                    break;
                }
            }
        }
        return myResult;
}