如何获取combobox选中的值

Posted 2023-03-09

1.添加combobox后做如下设置

2.根据自己的需要在类中重写如下方法

// ==========================================================
// Combo box data source methods
// ==========================================================
- (NSInteger) numberOfItemsInComboBox: (NSComboBox *) aComboBox
#pragma unused (aComboBox)
return ([dataSource count]);

- (id) comboBox: (NSComboBox *) aComboBox objectValueForItemAtIndex: (NSInteger) index
#pragma unused (aComboBox)
return [dataSource objectAtIndex:index];

- (NSUInteger) comboBox: (NSComboBox *) aComboBox indexOfItemWithStringValue: (NSString *) string
#pragma unused (aComboBox)
return [dataSource indexOfObject:string];


- (NSString *) firstGenreMatchingPrefix: (NSString *) prefix
NSString *string = nil;
NSString *lowercasePrefix = [prefix lowercaseString];
NSEnumerator *stringEnum = [dataSource objectEnumerator];

while ( string = [stringEnum nextObject] )
if ([[string lowercaseString] hasPrefix:lowercasePrefix] )
return (string) ;


return (nil);
// firstGenreMatchingPrefix

- (NSString *) comboBox: (NSComboBox *) aComboBox completedString: (NSString *) inputString
#pragma unused (aComboBox)
// This method is received after each character typed by the user, because we have checked the "completes" flag for
// genreComboBox in IB.
// Given the inputString the user has typed, see if we can find a genre with the prefix, and return it as the suggested complete
// string.
NSString *candidate = [self firstGenreMatchingPrefix:inputString];
return (candidate ? candidate : inputString);

这些方法实现combobox在选择选项、自动完成时的处理方式。其中dataSource为NSArray。
3.设置combobox的datasource为实现上述方法的对象即可。 参考技术A string bianlian; //定义一个string 类型的变量
bianlian=combobox.selecteditem.text ;把下拉列表框中的值读出赋给变量名bianliang本回答被提问者和网友采纳 参考技术B

using System;  

using System.Collections.Generic;  

using System.ComponentModel;  

using System.Data;  

using System.Drawing;  

using System.Linq;  

using System.Text;  

using System.Threading.Tasks;  

using System.Windows.Forms;  

namespace WindowsFormsApplication1  

  

public partial class Form1 : Form  

  

public Form1()  

  

InitializeComponent();  

  

private void Form1_Load(object sender, EventArgs e)  

  

//添加数据项  

comboBox1.Items.Add("apple");  

comboBox1.Items.Add("banana");  

  

private void button1_Click(object sender, EventArgs e)  

  

MessageBox.Show(comboBox1.SelectedItem.ToString());