显示动态下拉值
本文关键字：动态 显示 | 更新日期: 2023-09-27 18:01:36
我正在制作一个表单来插入关于文章的数据。我有一个名为"文章"和其他"类别"的表。在表articles中，有一个名为categores_id的行，其中包含特定类别的id。在我的表单中，我有一个名为"类别"的字段，这是下拉。我正在使用数据列表。我想要的是显示所有类别从表"类别"下拉，当用户选择其中一个，在表"文章"保存相应的id类别。在php中，我用关联数组来做这个，但在这里我真的不知道怎么做，因为我是这个语言的新手。
<fieldset>
<asp:DropDownList ID="DrpdKategoria" runat="server"> </asp:DropDownList>
</fieldset>
<asp:Button ID="btnInsert" runat="server" CommandName="Insert" Text="Shto" />
public partial class AddArticle : System.Web.UI.Page
{
string connection = n System.Configuration.ConfigurationManager.ConnectionStrings["ConnectionStringDatabase"].ConnectionString;
protected void Page_Load(object sender, EventArgs e)
{
Page.Form.Attributes.Add("enctype", "multipart/form-data");
try
{
if (!IsPostBack)
{
Bind();
}
}
catch (Exception ex)
{
Response.Write("Error:" + ex.ToString());
}
}
public void Bind()
{
SqlConnection con = new SqlConnection(connection);
SqlDataAdapter da = new SqlDataAdapter("select * from artikulli", con);
DataSet ds = new DataSet();
con.Open();
da.Fill(ds);
con.Close();
datalist2.DataSource = ds.Tables[0];
datalist2.DataBind();
}
protected void datalist2_ItemCommand(object source, DataListCommandEventArgs e)
{
if (e.CommandName.Equals("Insert"))
{
TextBox txtTema = e.Item.FindControl("txtTema") as TextBox;
TextBox txtAbstrakti = e.Item.FindControl("txtAbstrakti") as TextBox;
TextBox txtKeywords = e.Item.FindControl("txtKeywords") as TextBox;
TextBox txtKategoria = e.Item.FindControl("txtKategoria") as TextBox;
SqlConnection conn = new SqlConnection(connection);
SqlCommand command = new SqlCommand();
command.Connection = conn;
command.CommandText = "Insert into artikulli(tema,abstrakti,path,keywords,kategoria_id) values (@tema,@abstrakti,@filename,@keywords,@kategoria)";
command.Parameters.Add(new SqlParameter("@tema", txtTema.Text));
command.Parameters.Add(new SqlParameter("@abstrakti", txtAbstrakti.Text));
command.Parameters.Add(new SqlParameter("@keywords", txtKeywords.Text));
command.Parameters.Add(new SqlParameter("@kategoria", txtKategoria.Text));
FileUpload FileUploadArtikull = (FileUpload)e.Item.FindControl("FileUploadArtikull");
if (FileUploadArtikull.HasFile)
{
int filesize = FileUploadArtikull.PostedFile.ContentLength;
if (filesize > 4194304)
{
ScriptManager.RegisterStartupScript(this, this.GetType(), "popup", "alert('Maximumi i madhesise se file qe lejohet eshte 4MB');", true);
}
else
{
string filename = "artikuj/" + Path.GetFileName(FileUploadArtikull.PostedFile.FileName);
//add parameters
command.Parameters.AddWithValue("@filename", filename);
conn.Open();
command.ExecuteNonQuery();
conn.Close();
Bind();
FileUploadArtikull.SaveAs(Server.MapPath("~/artikuj''" + FileUploadArtikull.FileName));
Response.Redirect("dashboard.aspx");
}
}
else
{
ScriptManager.RegisterStartupScript(this, this.GetType(), "popup", "alert('ERROR');", true);
}
}
}
}
我的表artikulli有以下字段:
id int Unchecked
tema varchar(250) Checked
abstrakti text Checked
data_publikimit date Checked
path varchar(350) Checked
keywords varchar(350) Checked
kategoria_id int Checked
departamenti_id int Checked
表类别有以下字段:
id int Unchecked
emertimi varchar(350) Checked
我想从字段"emertimi"中获得类别的名称并在下拉列表中显示，但是对于每个名称都有id的索引，并且当选择其中一个时，将id保存在字段"categororia_id"
这只是一个示例程序，请自己照顾SQL注入。
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:DropDownList ID="drpdKategoria" runat="server" AutoPostBack="false"></asp:DropDownList>
<asp:Button ID="btnInsert" runat="server" Text="Insert"
onclick="btnInsert_Click" />
</div>
</form>
</body>
</html>
和。cs页面代码
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Data;
public partial class _Default : System.Web.UI.Page
{
SqlConnection con = new SqlConnection("Data Source=.''SQLEXPRESS;AttachDbFilename=E:''My Projects''practice''asp.net''drpdTest''App_Data''Database.mdf;Integrated Security=True;User Instance=True");
DataSet ds = new DataSet();
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
bindCategory();
}
}
private void ConnectionStatus() // Checking connection Status either it is open or not
{
if (ConnectionState.Closed == con.State)
{
try
{
con.Open();
}
catch (SqlException ex)
{
Response.Write("<script language= 'JavaScript'> alert('" + ex.Message + "')</script>");
}
}
}
private void bindCategory() // binding data to DropDownList
{
ConnectionStatus();
string Qry = "select * from category";
SqlDataAdapter da = new SqlDataAdapter(Qry, con);
da.Fill(ds);
drpdKategoria.DataSource = ds;
drpdKategoria.DataValueField = "category_id"; // Value of bided list in your dropdown in your case it will be CATEGORY_ID
drpdKategoria.DataTextField = "category_name"; // this will show Category name in your dropdown
drpdKategoria.DataBind();
con.Close();
con.Dispose();
ds.Dispose();
da.Dispose();
}
private void insertData()
{
ConnectionStatus(); // Checking connection state either it is open or not.
string Qry = "insert into article (categories_id) values('"+drpdKategoria.SelectedValue+"')";
SqlCommand cmd = new SqlCommand(Qry, con);
try
{
SqlDataReader dr = cmd.ExecuteReader();
Response.Write("<script language= 'JavaScript'> alert('Record Inserted Please Check Your table')</script>");
con.Close();
con.Dispose();
}
catch (SqlException ex)
{
Response.Write("<script language= 'JavaScript'> alert('" + ex.Message + "')</script>");
}
}
protected void btnInsert_Click(object sender, EventArgs e)
{
insertData();
}
}