C # ComboBox

Employee

1 usingSystem;2 usingSystem.Collections.Generic;3 usingSystem.Linq;4 usingSystem.Text;5 usingSystem.Threading.Tasks;6 7 namespaceWinapp03_combobox8 {9     enumem_departmentTen     { One Development Department, A Personnel Department, - Finance Department -     } the     classEmployee -     { -          Public intID {Get;Set; } -          Public stringName {Get;Set; } +          PublicEm_department Department {Get;Set; } -          PublicDateTime BirthDate {Get;Set; } +  A         /// <summary> at         ///overriding the ToString () method -         /// </summary> -         /// <returns>return Value: Name property</returns> -          Public Override stringToString () -         { -             return  This. Name; in         } -     } to}

From1

1 usingSystem;2 usingSystem.Collections.Generic;3 usingSystem.ComponentModel;4 usingSystem.Data;5 usingSystem.Drawing;6 usingSystem.Linq;7 usingSystem.Text;8 usingSystem.Threading.Tasks;9 usingSystem.Windows.Forms;Ten  One namespaceWinapp03_combobox A { -      Public Partial classForm1:form -     { the          PublicForm1 () -         { - InitializeComponent (); -         } +  -         Private voidForm1_Load (Objectsender, EventArgs e) +         { A             /**        at //Add a string to ComboBox1 - comboBox1.Items.Add ("Hello"); - ComboBox1.Items.Add ("World"); - comboBox1.Items.Add ("Hello, World"); - //Set default index - Combobox1.selectedindex = 2;  in              * */ -  toList<employee> employees =NewList<employee>() +             { -                 NewEmployee () {ID =1, Name ="Zhang San", BirthDate =NewDateTime (1988,Geneva, at), Department =em_department. Development department}, the                 NewEmployee () {ID =2, Name ="John Doe", BirthDate =NewDateTime (1990,Ten, ,), Department =em_department. Finance Department}, *                 NewEmployee () {ID =3, Name ="Harry", BirthDate =NewDateTime (1995,Geneva, .), Department =em_department. Personnel Department}, $                 NewEmployee () {ID =4, Name ="Zhao Liu", BirthDate =NewDateTime (1990, -, the), Department =em_department. Development Department}Panax Notoginseng             }; -  the             //Binding Data Sources +Combobox1.datasource =employees; A             //The Name property of the data source is displayed theCombobox1.displaymember ="Name"; +             //The Value field is the ID property of the data source -Combobox1.valuemember ="ID"; $             //Set index, default not selected ( -1) $Combobox1.selectedindex =-1; -         } -  the         Private voidCombobox1_selectedvaluechanged (Objectsender, EventArgs e) -         {Wuyi             if( -1==Combobox1.selectedindex) the             { -Label1. Text ="index of the currently selected item: 1"; WuLabel2. Text ="no items are currently selected"; -Label3. Text ="no items are currently selected"; About             } $Label1. Text ="index of the currently selected item:"+comboBox1.SelectedIndex.ToString (); -Label2. Text ="currently checked item ID:"+comboBox1.SelectedValue.ToString (); -Label3. Text ="the currently selected name:"+comboBox1.SelectedItem.ToString (); -         } A  +     } the}

C # ComboBox