Question

我正在使用C＃，我从数据库中获取数据：

da.SelectCommand = new SqlCommand("SELECT name,company,startdate,enddate,DATEDIFF(day,GETDATE(),enddate) AS days FROM Person", cn);
ds.Clear();
da.Fill(ds);
dgvViolation.DataSource = ds.Tables[0];

并且数据将在datagridview中显示如下：

name   company startdate enddate   days
---------------------------------------
john   IBM     12/2/2012 20/2/2012 5    
steven IBM     1/2/2012  12/2/2012 -3

我需要datagridview才能显示仅在days列中显示的正值。我该怎么做？

Answer 1

将查询更改为

"SELECT name,company,startdate,enddate,DATEDIFF(day,GETDATE(),enddate) AS days FROM Person WHERE days > 0"

Answer 2

为什么不直接更改SQL命令以返回0以上的值？

但是如果你想要返回所有返回的数据，你可以使用gridview的RowDataBound事件，如下所示：

protected void gridview_RowDataBound(object sender, System.Web.UI.WebControls.GridViewRowEventArgs e)
    {
        if (e.Row.RowType == System.Web.UI.WebControls.DataControlRowType.DataRow)
        {
            //look at the value of the days column and use e.Row.Style["Display"] = "none"; to hide it.
        }
    }

只获得大于零的值

2 个答案: