Question

FindControl("DataList" + i).DataSource

this.FindControl("DataList" + i).DataSource = data.Tables["aj_llautotype3"];
this.FindControl("DataList" + i).DataBind();
错误 找不到DataSource 怎么办？

Answer 1

FindControl返回的是Control类型，你需要强制转换DataList，如下
DataList dataList = this.FindControl("DataList" + i) as DataList;
dataList.DataSource = data.Tables["aj_llautotype3"];
dataList.DataBind();

Answer 2

DataList data1=(DataList)this.FindControl("DataList" + i);
data1.DataSource = data.Tables["aj_llautotype3"];
data1.DataBind();

this.FindControl("DataList" + i) 这句返回的是Control不是DataList 所以要强制转换后才能有属性 DataSource