[英]Silverlight C#: How to filter a combobox based on another combobox?
[英]Filter on combobox based on another combobox with same table data in c#
我有2个组合框和数据网格视图,我可以基于表格分别过滤2个组合框,但是我想根据第1个组合框进行过滤。 我尝试了不同的方法,但是我的第二个组合框是空的..什么都没有发生..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;
}
您正在寻找州/城市之类的过滤器(例如),对吗? 因此,如果有人在第一个组合框中选择了一个州,则您希望在第二个组合框中填充该州内的城市列表。 正确?
除了关于使用参数化查询和使用 SQL连接的明显注释之外,您是否真的在数据库管理程序中直接检查了SQL语句? 在我看来,语句文本之间没有空格
... comboBox1.Text +“'” +“和([ICPS]。[dbo] ...
除此之外,您显然还需要将所选索引事件中的第二个组合加载到第一个组合上。
我已经尝试过了,现在一切正常。
私人无效comboBox1_SelectedIndexChanged(对象发送者,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]);
}
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