从数据库中填充 DropDownList答案

【问题标题】：Fill DropDownList from database从数据库中填充 DropDownList
【发布时间】：2011-04-23 08:34:00
【问题描述】：

我是 C# 新手，并试图根据数据库值填充 DropDownList。我尝试如下所示连接到数据库 - 使用该语句进行测试，它说已连接。我可以假设这是正确的吗？我在正确的轨道上吗？另外，如何从表中选择值并用字段填充 DropDownList？

protected void Page_Load(object sender, EventArgs e)
{
    SqlConnection connection = new SqlConnection (
    "Data Source=.\\SQLEXPRESS;AttachDbFilename=C:customers.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True");

     try
     {
         connection.Open();
         TextBox1.Text = "connected";
     }
     catch (Exception)
     {
         TextBox1.Text = " not connected";
     }
 }

【问题讨论】：

我现在明白了，很抱歉浪费了任何人的时间 :)
你在正确的轨道上。要将项目添加到组合框，只需 comboBox1.Items.Add(object)
@Ken：您可以在这个问题上点击删除吗，因为您不需要答案，因此如果没有相关答案，它将以低质量结束。
由于您将 SQL 硬编码到您的代码中，您不妨使用 SqlDataSource 控件。 msdn.microsoft.com/en-us/library/dz12d98w(v=VS.100).aspx

标签： c# asp.net sql-server ado.net drop-down-menu

【解决方案1】：

protected void Page_Load(object sender, EventArgs e)
{
    SqlConnection connection = new SqlConnection (
    "Data Source=.\\SQLEXPRESS;AttachDbFilename=C:customers.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True");

     try
     {
          SqlDataReader dReader;
          SqlCommand cmd = new SqlCommand();
          cmd.Connection = connection;
          cmd.CommandType = CommandType.Text;
          cmd.CommandText ="Select distinct [Name] from [Names]" +
          " order by [Name] asc";
         connection.Open();

         dReader = cmd.ExecuteReader();
         if (dReader.HasRows == true)
         {
              while (dReader.Read())
              //Names collection is a combo box.
              namesCollection.Add(dReader["Name"].ToString());

         }
         else
         {
              MessageBox.Show("Data not found");
         }
           dReader.Close()
         TextBox1.Text = "connected";
     }
     catch (Exception)
     {
         TextBox1.Text = " not connected";
     }
 }

Hope that helps................

【讨论】：

【解决方案2】：

非常简单：----

SqlConnection con = new SqlConnection(); 
DataSet ds = new DataSet(); 
con.ConnectionString = @"Data Source=TOP7\SQLEXPRESS;Initial Catalog=t1;Persist Security Info=True;User ID=Test;Password=t123";
string query = "Select * from tbl_User"; 
SqlCommand cmd = new SqlCommand(query, con); 
cmd.CommandText = query;
con.Open(); 
SqlDataAdapter adpt = new SqlDataAdapter(cmd);
adpt.Fill(ds);
comboBox1.Items.Clear();
comboBox1.DisplayMember = "UserName";
comboBox1.ValueMember = "UserId";
comboBox1.DataSource = ds.Tables[0];

------------------------------------------------------------------------

【讨论】：

【解决方案3】：

            using (SqlConnection con = new SqlConnection("Data Source = NIPOON; Initial Catalog = CustomerOrders; Integrated Security = true"))
            {
                SqlCommand cmd = new SqlCommand("SELECT Name FROM Customer", con);
                con.Open();

                dropDownList.DataSource = cmd.ExecuteReader();
                dropDownList.DataTextField = "Name";
                dropDownList.DataValueField = "Name";
                dropDownList.DataBind();
            }

【讨论】：