combobox

问题 I am a beginner at C# and am having some serious issues setting the data source of a combo box. What I want to have happen is as follows: I want the combo box on my C# windows forum to be populated with the string names in just one column of a table in my mySQL database. The mySQL table has the following format: river_id, river_name, ....... (other columns) _____________________________________________ 1 river1 2 river2 3 river3 4 river4 5 river5 6 river6 What I want to happen is have the

问题 How do I add a MouseListener to a ComboBox ? I have tried: comboBox.addMouseListener(new MouseAdapter() { public void mousePressed(MouseEvent event) { System.out.println("ok"); } public void mouseReleased(MouseEvent event) { System.out.println("ok"); } }); It doesn't seems to work. I need to make the program do something when I press on the ComboBox , for example for typing because it is editable. 回答1: For basic swing related questions (I assume you use swing here), check the swing trail of

问题 I am trying to populate Combox like this : DataSet ds = new DataSet(); SqlDataAdapter da = new SqlDataAdapter("SELECT id,name FROM table1", con); da.Fill(ds, "FillDropDown"); comboProject.DisplayMember = "FillDropDown.name"; comboProject.ValueMember = "FillDropDown.id"; comboProject.DataSource = ds.Tables["FillDropDown"]; But all item are showing as "System.Data.DataRowView" in Combobox. why it is like that? Thanks in Advance. 回答1: try comboProject.DataSource = ds.Tables["FillDropDown"]

问题 I am trying to get a ComoboBox in a Windows App to open upwards instead of downwards. I've read about doing this in WPF but obviously the syntax is a little different. I've tried modifying the ControlTemplate of the ComboBox but I am not sure exactly what property I am supposed to be modifying. Is there an easy way to do this for a Windows App ? Edit: When I try to apply Florian's fix, I get the following build error: Error 1 'Windows.UI.Xaml.Controls.ControlTemplate' does not contain a

问题 I have a program that builds report documents and am wanting to place the routine to build the report under a "DoWork" handler for a background worker. The initial part of the report is started, however, once I reference selected items in a combo box it stops executing? Here is my code: Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click ProgressBar1.Visible = True Application.EnableVisualStyles() ProgressBar1.Style = ProgressBarStyle.Marquee ProgressBar1

问题 I am trying to validate 3 combobox which are for date, month, year. I am using jquery.js and jquery.validate.js. It is showing errors for each combobox if it is not selected, but I want only one message instead of 3 errors. 回答1: Two things are needed - add all 3 to a group , and setup the errorPlacement option to appropriately place the error message. So if your form looks like this: <form> <select name="day" class="required"> <option value="">Day</option> <option value="1">1</option> <!--

问题 I am trying to list data types from Microsoft Access 2000-2007 (depending on the MS Access database version) in a combobox for a C# program. How can I achieve such a thing? 回答1: I don't think it is possible to interrogate the engine at run time to enumerate the data types it supports. For example, DAO will not reveal some of the Jet 4.0 data types such as NCHAR and BINARY ; ADO will reveals data types that the Access database engine has never supported; only ACEDAO will reveal multivalued

问题 In my program I have a comboBox and a listBox . The listBox is full of different commands. The selectedItem and contents of the comboBox depend on which command is selected. The selectedItem in the comboBox stays selected for that command. For example, when the user has content selected in the comboBox and they switch to a different command, and then switch back, the same item will still be selected in the comboBox . Because the comboBox gets populated with different items depending on which

问题 I've Harvest_Base class where all DateTime formats are shown; class Harvest_Base { public static DateTime storeTime(String date) { DateTime returnValue = new DateTime(); if (date == "") return returnValue; //Time or Date Component Does not Exist string[] formats= {"M/d/yyyy h:mm:ss tt", "M/d/yyyy h:mm tt", "MM/dd/yyyy hh:mm:ss", "M/d/yyyy h:mm:ss", "M/d/yyyy hh:mm tt", "M/d/yyyy hh tt", "M/d/yyyy h:mm", "M/d/yyyy h:mm", "MM/dd/yyyy hh:mm", "M/dd/yyyy hh:mm", "h:mm tt","hh:mm tt","HH:mm:ss","H

问题 I have created a userform with 2 comboboxes, a textbox and a button that will link the comboboxes/textbox depending on the scenario. For one of the scenarios, if combobox 2, displays the same text/value currently in the worksheet MRFGLR Range Column A change the value of column AE with the textbox value in the same row as the combobox 2 value in Worksheet MFGLR. In a Userform, Link Textbox to the same row as the combobox but different Column I'm having trouble having the code find the same