仅在按下向下键时才能获得Combobox selectedValue [英] Only able to get Combobox selectedValue when down key is pressed
问题描述
我已经制作了WPF自动完成组合框,而我所面临的问题是,当我按下向下键时,我只能获得ComboBox的SelectedValue.
I have made a WPF Autocomplete Combobox, and the problem which i am facing is that i am only able to get SelectedValue of ComboBox when i press Down Key.
问题在BindComboBox方法下面,而comboBox5.SelectedValue仅在按下向下键时起作用.
Problem is in below BindComboBox Method, and comboBox5.SelectedValue only works when down Key is pressd.
public void BindComboBox3(ComboBox comboBox3) //BatchCombobox
{
SqlDataAdapter da = new SqlDataAdapter("Select id,batch_id FROM batch where product_id_fk='" + Convert.ToInt32(comboBox5.SelectedValue) + "' and left_qty>0", con);
DataSet ds = new DataSet();
da.Fill(ds, "batch");
comboBox3.ItemsSource = ds.Tables[0].DefaultView;
comboBox3.DisplayMemberPath = ds.Tables[0].Columns["batch_id"].ToString();
comboBox3.SelectedValuePath = ds.Tables[0].Columns["id"].ToString();
}
但是在下面的代码中,comboBox5.SelectedValue正常工作.
But in Below code comboBox5.SelectedValue is properly Working.
private void comboBox5_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
comboBox3.IsEnabled = true;
BindComboBox3(comboBox3); //Problem is in this Function
con.Open();
SqlCommand cmd1 = new SqlCommand("SELECT med_type,fk_com_id FROM products where p_id_pk='" + Convert.ToInt32(comboBox5.SelectedValue) + "'", con);
SqlDataReader med_oftype = null;
med_oftype = cmd1.ExecuteReader();
while (med_oftype.Read())
{
get_med_type = med_oftype["med_type"].ToString();
cmpny_id = Convert.ToInt32(med_oftype["fk_com_id"]);
}
con.Close();
}
private void ProductsComboBox_TextChanged(object sender, TextChangedEventArgs e)
{
if (((ComboBox)sender).Text != "")
{
SqlDataAdapter da = new SqlDataAdapter("Select p_id_pk,p_name FROM products", con);
DataSet ds = new DataSet();
da.Fill(ds, "products");
comboBox5.ItemsSource = ds.Tables[0].DefaultView.RowFilter = "p_name like '" + ((ComboBox)sender).Text + "'+'%'";
comboBox5.ItemsSource = ds.Tables[0].DefaultView;
comboBox5.DisplayMemberPath = ds.Tables[0].Columns["p_name"].ToString();
comboBox5.SelectedValuePath = ds.Tables[0].Columns["p_id_pk"].ToString();
}
else
{
comboBox5.ItemsSource = null;
}
}
摘要是,在一个事件处理程序中,comboBox5.SelectedValue工作正常,而在另一个comboBox5.SelectedValue中,工作异常正常.不知道是什么原因导致此问题.
Summary is that in one event handler comboBox5.SelectedValue is working and in other comboBox5.SelectedValue is not working. Dont know what is causing this problem.
推荐答案
- 如果您可以共享.xaml代码,这将很有帮助
- 还可以澄清为什么发送( comboBox3 )作为参数的原因尽管可以在视图中的任何位置访问它
- 作为一种快速解决方案,您可以将 SelectedValue 作为参数传递给 BindComboBox3 方法
- if you can share your .xaml code this would be helpful
- also if you can clarify why you send (comboBox3) as a parameter although it is accessible any where in the view
- as a quick solution you can pass SelectedValue as a parameter to BindComboBox3 method
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