我的代码出现问题。
我已经看到了一些答案，但我无法让它在我的代码中工作，希望有人可以请求帮助我一直试图解决一段时间。以下是我的代码。
我尝试了回发语句但仍然无效，droptopico总是返回0;我需要这个值，所以我可以从dropsub选择一些东西。
基本上这段代码是为了实现一个用户选择主题的论坛，它将从该主题生成子主题，并显示用户是否有权限，有人可以帮助我......提前感谢。
我在mysql管理上使用Storedprocedure - 它工作得很好所以问题可能就在我认为的绑定中，只是不知道如何解决它...
using System;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Web.UI.WebControls;
using System.Configuration;
using System.Drawing;
using System.Windows.Forms;
using System.Collections.Generic;
using System.ComponentModel;
using System.Text;
public partial class About : System.Web.UI.Page
{
SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["forumConnectionString2"].ToString());
public void Page_Load(object sender, EventArgs e)
{
if (Page.IsPostBack == false)
{ login();
topico1();
subtopico1();
BindRepeaterData();
BindRepeaterDataPost();
}
}
public void login()
{string loginid = "";
SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["forumConnectionString2"].ToString()); //definição do comando sql
conn.Open();
SqlCommand comm = conn.CreateCommand();
comm.CommandType = CommandType.StoredProcedure;
comm.CommandText = "SP_veruseraposlogin";
comm.Parameters.AddWithValue("@nome", Page.User.Identity.Name);
SqlDataReader rdr = comm.ExecuteReader();
if (rdr.HasRows)
{
while (rdr.Read())
{
loginid = rdr["Id"].ToString();
}
Lblidlog.Text = loginid;
conn.Close();
}
}
protected void subtopico1()
{
SqlConnection conn3 = new SqlConnection(ConfigurationManager.ConnectionStrings["forumConnectionString2"].ToString()); //definição do comando sql
conn3.Open();
SqlCommand comm3 = conn3.CreateCommand();
comm3.CommandType = CommandType.StoredProcedure;
comm3.CommandText = "SP_verutilizadorsubtopicoforum";
comm3.Parameters.AddWithValue("@id_user", Lblidlog.Text);
comm3.Parameters.AddWithValue("@id_top", droptopico.SelectedValue.ToString());
SqlDataReader rdrsub = comm3.ExecuteReader();
dropsub.DataSource = rdrsub;
dropsub.DataValueField = "Id_subtopico";
dropsub.DataTextField = "nome";
dropsub.DataBind();
rdrsub.Close();
conn3.Close();
}
protected void topico1()
{
SqlConnection conn2 = new SqlConnection(ConfigurationManager.ConnectionStrings["forumConnectionString2"].ToString()); //definição do comando sql
conn2.Open();
SqlCommand comm2 = conn2.CreateCommand();
comm2.CommandType = CommandType.StoredProcedure;
comm2.CommandText = "SP_verutilizadorTopico";
comm2.Parameters.AddWithValue("@id_user", Lblidlog.Text);
SqlDataReader rdrtop = comm2.ExecuteReader();
droptopico.DataSource = rdrtop;
droptopico.DataValueField = "Id_Topico";
droptopico.DataTextField = "nome";
droptopico.DataBind();
rdrtop.Close();
conn2.Close();
}
protected void BindRepeaterData()
{
conn.Open();
SqlCommand cmd = new SqlCommand("select * from Mensagem where id_subtopico = @id_sub Order By data desc", conn);
DataSet ds = new DataSet();
if (dropsub.SelectedValue != "")
{
cmd.Parameters.AddWithValue("@id_sub", this.dropsub.SelectedValue);
}
else
{
cmd.Parameters.AddWithValue("@id_sub", 1);
}
SqlDataAdapter dab = new SqlDataAdapter(cmd);
dab.Fill(ds);
RepDetails.DataSource = ds;
RepDetails.DataBind();
conn.Close();
}
protected void DropsubSelectedIndexChanged(object sender, EventArgs e)
{
login();
topico1();
BindRepeaterData();
BindRepeaterDataPost();
}
protected void BindRepeaterDataPost()
{
conn.Open();
SqlCommand cmd = new SqlCommand("SELECT Post.*, Ficheiro.Nome FROM Ficheiro INNER JOIN Post ON Ficheiro.IdFicheiro = Post.IdFicheiro where Post.id_subtopico = @Id_sub Order By data desc", conn);
DataSet das = new DataSet();
if (dropsub.SelectedValue != "")
{
cmd.Parameters.AddWithValue("@id_sub", this.dropsub.SelectedValue);
}
else
{
cmd.Parameters.AddWithValue("@id_sub", 1);
}
SqlDataAdapter daa = new SqlDataAdapter(cmd);
daa.Fill(das);
RepDetailsPost.DataSource = das;
RepDetailsPost.DataBind();
conn.Close();
}
//Bind Data to Repeater Control
protected void Button1_Click(object sender, EventArgs e)
{
//definição da string de conexão
SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["forumConnectionString2"].ToString()); //definição do comando sql
conn.Open();
//Cria uma objeto do tipo comando passando como parametro a string sql e a string de conexão
//Adicionando o valor das textBox nos parametros do comando
SqlCommand sqlCommand = conn.CreateCommand();
sqlCommand.CommandType = CommandType.StoredProcedure;
sqlCommand.CommandText = "usp_inserirmsg";
sqlCommand.Parameters.AddWithValue("@id_sub", this.dropsub.SelectedValue);
sqlCommand.Parameters.AddWithValue("@nome_user", Page.User.Identity.Name);
sqlCommand.Parameters.AddWithValue("@msg", this.txtmsg.Text);
//executa o comando com os parametros que foram adicionados acima
sqlCommand.ExecuteNonQuery();
this.lblstatusmsg.ForeColor = Color.FromArgb(255, 6, 255, 196);
lblstatusmsg.Text = "Mensagem enviada";
conn.Close();
}
protected void novocomentario_Click(object sender, System.Web.UI.ImageClickEventArgs e)
{
Panel1.Visible = true;
}
protected void droptopico_SelectedIndexChanged(object sender, EventArgs e)
{
login();
topico1();
subtopico1();
}
protected void Button3_Click(object sender, EventArgs e)
{
login();
topico1();
}
}
答案 0 :(得分：1)
您已在此代码中调用了topico1（）函数，此函数再次绑定了下拉列表。下拉值再次刷新。请删除对topico1（）函数的调用。
protected void droptopico_SelectedIndexChanged(object sender, EventArgs e)
{
login();
//topico1();
subtopico1();
}