Question

我有2个组合框和数据网格视图我可以根据表分别过滤2个组合框但我想根据第一个组合框过滤它们。我尝试了不同的方法，但我的第二个组合框是空的..没有任何反应..请帮助我。

{
    String Query = " SELECT  distinct [t_street_name] FROM  [ICPS].[dbo].[tickets]  ";
    SqlConnection conDataBase = new SqlConnection(conString);
    SqlCommand cmdDataBase = new SqlCommand(Query, conDataBase);
    SqlDataAdapter sda = new SqlDataAdapter(cmdDataBase);
    SqlDataReader myReader;
    try
    {
        conDataBase.Open();
        myReader = cmdDataBase.ExecuteReader();

        while (myReader.Read())
        {
            string t_street_name = myReader["t_street_name"].ToString();
            comboBox1.Items.Add(t_street_name);
        }
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
}

void fillcombo1()
{

    String Query =  ("SELECT  distinct [t_zone_name] FROM  [ICPS].[dbo].[tickets] where  [t_street_name] ='" + comboBox1.SelectedItem + "'conString ") ;
    SqlConnection conDataBase = new SqlConnection(conString);
    SqlCommand cmdDataBase = new SqlCommand(Query, conDataBase);
    SqlDataReader myReader;
    try
    {
        conDataBase.Open();
        myReader = cmdDataBase.ExecuteReader();

        while (myReader.Read())
        {
            string t_zone_name = myReader["t_zone_name"].ToString();
            comboBox2.Items.Add(t_zone_name);
        }
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
}

private void Form1_Load(object sender, EventArgs e)
{
}

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
}

private void button2_Click(object sender, EventArgs e)
{
    SqlConnection conDatabase = new SqlConnection(constring);

    conDatabase.Open();

    DataTable db = new DataTable();
    SqlDataAdapter sda = new SqlDataAdapter(String.Format("select  distinct *  from" + " [ICPS].[dbo].[tickets] " +
    "where   [ICPS].[dbo].[tickets].[t_street_name]  = '" + comboBox1.Text + "'" +
    "and ([ICPS].[dbo].[tickets].[t_date_time_issued]) BETWEEN Convert(DATETIME, '{0}', 103) AND Convert(DATETIME, '{1}', 103)", StartDate.Value.ToString("dd/MM/yyyy"), EndDate.Value.ToString("dd/MM/yyyy")), constring);

    sda.Fill(db);

    dataGridView1.DataSource = db;
}

Answer 1

您正在寻找状态/城市过滤（例如），对吗？因此，如果有人在第一个组合框中选择一个状态，那么您希望该状态中的城市列表填充在第二个组合框中。正确的吗？

Answer 2

除了有关使用参数化查询和Using SQL连接的明显注释之外，您是否直接在数据库管理程序中检查了SQL语句？对我来说，似乎

之间的陈述文本中没有空格

... comboBox1.Text +“'”+ “和（[ICPS]。[dbo] ......

除此之外，您显然需要在第一个组合中从所选索引事件加载第二个组合。

Answer 3

我已经尝试过一切正常的工作..

private void comboBox1_SelectedIndexChanged（object sender，EventArgs e） {

         SqlConnection conDatabase = new SqlConnection(constring);

        comboBox2.SelectedIndex = -1;
        comboBox2.Items.Clear();
        if ( conDatabase.State == ConnectionState.Closed)
        {
            conDatabase.Open();
        }
        SqlCommand cmd = new SqlCommand(" select distinct  sz_zone_name from  [ICPS].[dbo].[spid_zones] " + 
            "inner join [ICPS].[dbo].[spid_street]" +
             " on [ICPS].[dbo].[spid_street].ss_number = [ICPS].[dbo].[spid_zones].[sz_street_number]"  +
         " where [ICPS].[dbo].[spid_street].ss_name  ='" + comboBox1.SelectedItem + "'", conDatabase);
        SqlDataReader rd = cmd.ExecuteReader();
        while (rd.Read())
        {
            comboBox2.Items.Add(rd[0]);
        }

基于c＃中具有相同表格数据的另一个组合框对组合框进行过滤

3 个答案: