Question

ASP.NET 在日期控件上选择日期在gridview控件上选择出对应的日期列

在Label控件上显示条数为什么有1条的时候显示0 有一条的时候显示1 就慢了一拍
代码如下就大神改改
protected void Page_Load(object sender, EventArgs e)
{
//SqlConnection con = new SqlConnection(@"Data Source=long-pc\sqlexpress;Initial Catalog=sqxt;Integrated Security=True");
//con.Open();
////建立命令

//SqlCommand cmd = new SqlCommand("select count (*) from sq", con);
////SqlDataReader 显示数据
//SqlDataReader dr = cmd.ExecuteReader();
//if (dr.Read())
//{

//Label1.Text = (this.GridView1.Rows.Count).ToString();
//dr[""].ToString();
//}

}
protected void Button_Click(object sender, EventArgs e)
{
this.Calendar.Visible = true;
}
protected void Calendar_SelectionChanged(object sender, EventArgs e)
{
this.TextBox.Text = this.Calendar.SelectedDate.ToString("yyyy/MM/dd");
Label1.Text = (this.GridView1.Rows.Count).ToString();
this.Calendar.Visible = false;

// this.Label1.Text = (this.GridView1.Rows.Count).ToString();

//SqlConnection con = new SqlConnection(@"Data Source=long-pc\sqlexpress;Initial Catalog=sqxt;Integrated Security=True");
//con.Open();
////建立命令

//SqlCommand cmd = new SqlCommand("select time from sq", con);
////SqlDataReader 显示数据
//SqlDataReader dr = cmd.ExecuteReader();
//if (dr.Read() == this.Calendar.SelectedDate)
//{

// Label1.Text = dr[""].ToString();

//}

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Answer 1

asp.net中C#事件触发是这样的流程，事件触发>刷新页面运行页面加载>运行pageload>运行事件里面内容，所以你慢半拍。这种情况最好用ajax或者用隐藏控件先存储参数，在pageload里面写相应代码，要不然一直会要慢一步