从C＃中的另一个函数调用一个函数

Question

I have a button click event which insert comment text from textbox to database.Now i need to call a function that displays comment after the click event of insert comment button is clicked.Here's the code.

With this code I insert text to database

 protected void cmt_Click(object sender, EventArgs e)
{

    //DateTime.Now.ToString();
    Button btn = (Button)sender;
    DataListItem dli = (DataListItem)btn.NamingContainer;
    TextBox tx = (TextBox)dli.FindControl("tb_cmt");
    Label lb = (Label)dli.FindControl("lbl_sid");
    string userid = Session["userid"].ToString();

    sq.connection();
    SqlCommand cmd = new SqlCommand("insert into comment(ecomment,sid,my_date,reg_id) values(@myecomment,@mysid,@mydate,@reg_id)", sq.con);
    cmd.Parameters.AddWithValue("@myecomment", tx.Text);
    cmd.Parameters.AddWithValue("@mysid", lb.Text);
    cmd.Parameters.AddWithValue("@mydate", DateTime.Now.ToString("h:mm, MMM  dd, yyyy"));
    cmd.Parameters.AddWithValue("@reg_id", userid);
    cmd.ExecuteNonQuery();
    sq.con.Dispose();
    sq.con.Close();
    tx.Text = "";

    //bind_dlcmt( 1 );

}

Now here's the code to display comment from database.

 public void showdata()
{
    string str = gstr;
    sq.connection();
    SqlCommand cmd = new SqlCommand("select * from sub_catTbl where sid='" + str + "' ", sq.con);
    //SqlCommand cmd = new SqlCommand("select * from sub_catTbl", sq.con);
    SqlDataAdapter da = new SqlDataAdapter(cmd);
    DataTable dt = new DataTable();
    da.Fill(dt);

    mydatalist.DataSource = dt;
    mydatalist.DataBind();
    sq.con.Dispose();
    sq.con.Close();


    foreach (DataListItem dli in mydatalist.Items)
    {
        bind_dlcmt(dli.ItemIndex);
        //blin_dlcmt();

    }
}

 public void bind_dlcmt(int itm_indx)
{
    string str = gstr;
    //int sid = Convert.ToInt32(mydatalist.DataKeys[itm_indx]);
    sq.connection();
    SqlCommand cmd = new SqlCommand("select top 4 * from comment where sid='" + str + "' order by my_date desc", sq.con);
    //SqlCommand cmd = new SqlCommand("select * from comment where sid=@sid ", sq.con);
    //cmd.Parameters.AddWithValue("@sid", sid);
    SqlDataReader sdr = cmd.ExecuteReader();

    DataList dl = (DataList)mydatalist.Items[itm_indx].FindControl("dl_cmt");
    dl.DataSource = sdr;
    dl.DataBind();
}

I need to call the function binddlcmt() in the last line of the cmt_Click button click event.With the one argument inside the function, i am not sure how do i call the function.

Answer 1

So you want to know how to get the item-index in the button-click event handler?

Use DataListItem.ItemIndex :

protected void cmt_Click(object sender, EventArgs e)
{
    Button btn = (Button)sender;
    DataListItem dli = (DataListItem)btn.NamingContainer;
    // ...
    bind_dlcmt( dli.ItemIndex );
}