列表框和文本框匹配单词 [英] Listbox and Textbox matching word

问题描述

我有一个文本框和一个列表框。在文本框的textchanges事件中，从数据库中填充列表框

然后从列表框中选择值并调用另一个值然后保存数据..我希望如果用户没有从列表框中选择任何值并离开文本框输入false值哪个列表框不包含我想阻止他...





我试过的代码是< br $>


btnclick

  if （listbox1.items.contains（textbox1））
 {
  //  调用另一个值。来自数据库 
} 
 
  else  
 messagebox.show（ 请从搜索框中选择一个值）; 

提前致谢....

解决方案

  //  代码设计文件的代码 
 命名空间 WindowsApplication1 
 {
  partial   class  Form1 
 {
  ///   <  摘要 >  
   ///  必需的设计变量。 
   ///   <   / summary  >  
   private  System.ComponentModel.IContainer components =  null ; 
 
  ///   <  摘要 >  
   ///  清理正在使用的所有资源。 
   ///   <   / summary  >  
   ///   <   param  < span class =code-summarycomment>   name =disposing > 如果管理资源应予以处理;否则，false。<   / param  >  
   protected  覆盖  void  Dispose（ bool 处理）
 {
  if （处置&&（components！=  null ））
 {
 components.Dispose（）; 
} 
  base  .Dispose（disposing）; 
} 
 
   #region Windows窗体设计器生成的代码
  
  ///   <  摘要 >  
   ///   Designer支持所需的方法 - 不要修改
   ///  使用代码编辑器的方法的内容。 
   ///   <   / summary  >  
   private   void  InitializeComponent（）
 {
  this  .txt =  new  System.Windows.Forms.TextBox（）; 
  this  .lst =  new  System.Windows.Forms.ListBox（）; 
  this  .SuspendLayout（）; 
  //    
  //   txt  
  //    
 此 .txt.Location =  new  System.Drawing.Point（ 40 ， 21 ）; 
 此 .txt.Name =   txt ; 
  this  .txt.Size =  new  System.Drawing.Size（ 325 ， 20 ）; 
  this  .txt.TabIndex =  0 ; 
  this  .txt.TextChanged + =  new  System.EventHandler（此 .txt_TextChanged）; 
  this  .txt.KeyDown + =  new  System.Windows.Forms.KeyEventHandler（此 .txt_KeyDown）; 
  this  .txt.Leave + =  new  System.EventHandler（此 .txt_Leave）; 
  this  .txt.Enter + =  new  System.EventHandler（此 .txt_Enter）; 
  //    
  //   lst  
  //    
 此 .lst.FormattingEnabled =  true ; 
  this  .lst.Location =  new  System.Drawing.Point（ 12 ， 37 ）; 
  this  .lst.Name =   lst ; 
  this  .lst.Size =  new  System.Drawing.Size（ 10 ， 4 ）; 
  this  .lst.TabIndex =  1 ; 
 此 .lst.Visible =  false ; 
  //    
  //   Form1  
  //    
  this  .AutoScaleDimensions =  new  System.Drawing.SizeF（6F，13F） ; 
  this  .AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font; 
  this  .ClientSize =  new  System.Drawing.Size（ 406 ， 309 ）; 
  this  .Controls.Add（ this  .lst）; 
  this  .Controls.Add（ this  .txt）; 
  this  .Name =   Form1< /跨度>; 
  this  .Text =   Form1< /跨度>; 
  this  .Load + =  new  System.EventHandler（此 .Form1_Load）; 
  this  .ResumeLayout（ false ）; 
  this  .PerformLayout（）; 
 
} 
 
   #endregion 
  
  private  System.Windows.Forms.TextBox txt; 
  private  System.Windows.Forms.ListBox lst; 
} 
} 

  //   cs文件代码 
 使用系统; 
 使用 System.Collections.Generic; 
 使用 System.ComponentModel; 
 使用 System.Data; 
 使用 System.Drawing; 
 使用 System.Text; 
 使用 System.Windows.Forms; 
 
 命名空间 WindowsApplication1 
 {
  public   partial   class  Form1：Form 
 {
 DataTable tblList =  new  DataTable（）; 
 DataView dvList =  null ; 
 
  public  Form1（）
 {
 InitializeComponent（）; 
} 
 
  private   void  txt_TextChanged（ object  sender，EventArgs e）
 {
 dvList.RowFilter =   Item Like' + txt.Text +  ％'; 
} 
 
  private   void  txt_Enter（ object  sender，EventArgs e）
 {
 lst.Width = txt.Width; 
 lst.Height =  100 ; 
 
 lst.Top = txt.Top + txt.Height; 
 lst.Left = txt.Left; 
 
  if （！lst.Visible）
 lst.Visible =  true ; 
} 
 
  private   void  txt_Leave（ object  sender，EventArgs e）
 {
  if （lst.SelectedIndex！= -1）
 {
 txt.Text = lst.Text; 
} 
  else  
 {
 txt.Text =  ; 
 MessageBox.Show（ 请仅从列表中选择！）; 
} 
 
 lst.Visible =  false ; 
} 
 
  private   void  Form1_Load（ object  sender，EventArgs e）
 {
 tblList.Columns.Add（ 项）; 
 
 tblList.Rows.Add（  ONE）; 
 tblList.Rows.Add（  TWO）; 
 tblList.Rows.Add（  THREE）; 
 tblList.Rows.Add（  FOUR）; 
 tblList.Rows.Add（  FIVE）; 
 tblList.Rows.Add（  SIX）; 
 tblList.Rows.Add（  SEVEN）; 
 tblList.Rows.Add（  EIGHT）; 
 tblList.Rows.Add（  NINE）; 
 tblList.Rows.Add（  TEN）; 
 
 lst.DisplayMember =   Item; 
 
 lst.DataSource = tblList; 
 
 dvList = tblList.DefaultView; 
} 
 
  private   void  txt_KeyDown（ object  sender，KeyEventArgs e）
 {
  try  
 {
  if （e.KeyValue ==  38 ） //   UP KEY  
 {
 lst.SelectedIndex = lst.SelectedIndex  -   1 ; 
} 
  else   if （e.KeyValue ==  40 ） //   DOWN KEY  
 {
 lst.SelectedIndex = lst.SelectedIndex +  1 ; 
} 
} 
  catch  {} 
} 
} 
} 

  //  代码设计器文件 
 命名空间 WindowsApplication1 
 {
 部分  class  Form1 
 {
  private  System.ComponentModel.IContainer components = 空; 
 
 受保护 覆盖  void  Dispose（ bool 处理）
 {
  if （disposing& &（components！=  null ））
 {
 components.Dispose（）; 
} 
  base  .Dispose（disposing）; 
} 
 
   #region Windows窗体设计器生成的代码
  
  private   void  InitializeComponent（）
 {
  this  .txt =  new  System.Windows.Forms.TextBox（）; 
  this  .lst =  new  System.Windows.Forms.ListBox（）; 
  this  .SuspendLayout（）; 
  //    
  //   txt  
  //    
 此 .txt.Location =  new  System.Drawing.Point（ 40 ， 21 ）; 
 此 .txt.Name =   txt ; 
  this  .txt.Size =  new  System.Drawing.Size（ 325 ， 20 ）; 
  this  .txt.TabIndex =  0 ; 
  this  .txt.TextChanged + =  new  System.EventHandler（此 .txt_TextChanged）; 
  this  .txt.KeyDown + =  new  System.Windows.Forms.KeyEventHandler（此 .txt_KeyDown）; 
  this  .txt.Leave + =  new  System.EventHandler（此 .txt_Leave）; 
  this  .txt.Enter + =  new  System.EventHandler（此 .txt_Enter）; 
  //    
  //   lst  
  //    
 此 .lst.FormattingEnabled =  true ; 
  this  .lst.Location =  new  System.Drawing.Point（ 12 ， 37 ）; 
  this  .lst.Name =   lst ; 
  this  .lst.Size =  new  System.Drawing.Size（ 10 ， 4 ）; 
  this  .lst.TabIndex =  1 ; 
 此 .lst.Visible =  false ; 
  //    
  //   Form1  
  //    
  this  .AutoScaleDimensions =  new  System.Drawing.SizeF（6F，13F） ; 
  this  .AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font; 
  this  .ClientSize =  new  System.Drawing.Size（ 406 ， 309 ）; 
  this  .Controls.Add（ this  .lst）; 
  this  .Controls.Add（ this  .txt）; 
  this  .Name =   Form1< /跨度>; 
  this  .Text =   Form1< /跨度>; 
  this  .Load + =  new  System.EventHandler（此 .Form1_Load）; 
  this  .ResumeLayout（ false ）; 
  this  .PerformLayout（）; 
 
} 
 
   #endregion 
  
  private  System.Windows.Forms.TextBox txt; 
  private  System.Windows.Forms.ListBox lst; 
} 
} 
  //   ---------- -------------------------------------------------- -----------------------------------  
  //   cs文件代码 
 使用系统; 
 使用 System.Collections.Generic; 
 使用 System.ComponentModel; 
 使用 System.Data; 
 使用 System.Drawing; 
 使用 System.Text; 
 使用 System.Windows.Forms; 
 
 命名空间 WindowsApplication1 
 {
  public   partial   class  Form1：Form 
 {
 DataTable tblList =  new  DataTable（）; 
 DataView dvList =  null ; 
 
  public  Form1（）
 {
 InitializeComponent（）; 
} 
 
  private   void  txt_TextChanged（ object  sender，EventArgs e）
 {
 dvList.RowFilter =   Item Like' + txt.Text +  ％'; 
} 
 
  private   void  txt_Enter（ object  sender，EventArgs e）
 {
 lst.Width = txt.Width; 
 lst.Height =  100 ; 
 
 lst.Top = txt.Top + txt.Height; 
 lst.Left = txt.Left; 
 
  if （！lst.Visible）
 lst.Visible =  true ; 
} 
 
  private   void  txt_Leave（ object  sender，EventArgs e）
 {
  if （lst.SelectedIndex！= -1）
 {
 txt.Text = lst.Text; 
} 
  else  
 {
 txt.Text =  ; 
 MessageBox.Show（ 请仅从列表中选择！）; 
} 
 
 lst.Visible =  false ; 
} 
 
  private   void  Form1_Load（ object  sender，EventArgs e）
 {
 tblList.Columns.Add（ 项）; 
 
 tblList.Rows.Add（  ONE）; 
 tblList.Rows.Add（  TWO）; 
 tblList.Rows.Add（  THREE）; 
 tblList.Rows.Add（  FOUR）; 
 tblList.Rows.Add（  FIVE）; 
 tblList.Rows.Add（  SIX）; 
 tblList.Rows.Add（  SEVEN）; 
 tblList.Rows.Add（  EIGHT）; 
 tblList.Rows.Add（  NINE）; 
 tblList.Rows.Add（  TEN）; 
 
 lst.DisplayMember =   Item; 
 
 lst.DataSource = tblList; 
 
 dvList = tblList.DefaultView; 
} 
 
  private   void  txt_KeyDown（ object  sender，KeyEventArgs e）
 {
  try  
 {
  if （e.KeyValue ==  38 ） //   UP KEY  
 {
 lst.SelectedIndex = lst.SelectedIndex  -   1 ; 
} 
  else   if （e.KeyValue ==  40 ） //   DOWN KEY  
 {
 lst.SelectedIndex = lst.SelectedIndex +  1 ; 
} 
} 
  catch  {} 
} 
} 
} 
  //   ------------------------ -------------------------------------------------- ---------------------  

i have a textbox and a list box. In textchanges event of textbox i m filling listbox from database
and then select value from listbox and calling another value and then saving data.. i want that if user doesn''t select any value from listbox and leaving textbox by typing false value which listbox doesn''t contains i want to stop him...


the code i tried is

btnclick

if(listbox1.items.contains(textbox1))
{
   //calling another value. from database 
} 

else
messagebox.show("Please select a value from searchbox");

Thanks in advance....

解决方案

// CODE FOR designer FILE
namespace WindowsApplication1
{
    partial class Form1
    {
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows Form Designer generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.txt = new System.Windows.Forms.TextBox();
            this.lst = new System.Windows.Forms.ListBox();
            this.SuspendLayout();
            // 
            // txt
            // 
            this.txt.Location = new System.Drawing.Point(40, 21);
            this.txt.Name = "txt";
            this.txt.Size = new System.Drawing.Size(325, 20);
            this.txt.TabIndex = 0;
            this.txt.TextChanged += new System.EventHandler(this.txt_TextChanged);
            this.txt.KeyDown += new System.Windows.Forms.KeyEventHandler(this.txt_KeyDown);
            this.txt.Leave += new System.EventHandler(this.txt_Leave);
            this.txt.Enter += new System.EventHandler(this.txt_Enter);
            // 
            // lst
            // 
            this.lst.FormattingEnabled = true;
            this.lst.Location = new System.Drawing.Point(12, 37);
            this.lst.Name = "lst";
            this.lst.Size = new System.Drawing.Size(10, 4);
            this.lst.TabIndex = 1;
            this.lst.Visible = false;
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(406, 309);
            this.Controls.Add(this.lst);
            this.Controls.Add(this.txt);
            this.Name = "Form1";
            this.Text = "Form1";
            this.Load += new System.EventHandler(this.Form1_Load);
            this.ResumeLayout(false);
            this.PerformLayout();

        }

        #endregion

        private System.Windows.Forms.TextBox txt;
        private System.Windows.Forms.ListBox lst;
    }
}

// CODE FOR cs FILE
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        DataTable tblList = new DataTable();
        DataView dvList = null;

        public Form1()
        {
            InitializeComponent();
        }

        private void txt_TextChanged(object sender, EventArgs e)
        {
            dvList.RowFilter = "Item Like '" + txt.Text + "%'";
        }

        private void txt_Enter(object sender, EventArgs e)
        {
            lst.Width = txt.Width;
            lst.Height = 100;

            lst.Top = txt.Top + txt.Height;
            lst.Left = txt.Left;

            if (!lst.Visible)
                lst.Visible = true;
        }

        private void txt_Leave(object sender, EventArgs e)
        {
            if (lst.SelectedIndex != -1)
            {
                txt.Text = lst.Text;
            }
            else
            {
                txt.Text = "";
                MessageBox.Show("Please select from list only !");
            }

            lst.Visible = false;
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            tblList.Columns.Add("Item");

            tblList.Rows.Add("ONE");
            tblList.Rows.Add("TWO");
            tblList.Rows.Add("THREE");
            tblList.Rows.Add("FOUR");
            tblList.Rows.Add("FIVE");
            tblList.Rows.Add("SIX");
            tblList.Rows.Add("SEVEN");
            tblList.Rows.Add("EIGHT");
            tblList.Rows.Add("NINE");
            tblList.Rows.Add("TEN");

            lst.DisplayMember = "Item";

            lst.DataSource = tblList;

            dvList = tblList.DefaultView;
        }

        private void txt_KeyDown(object sender, KeyEventArgs e)
        {
            try
            {
                if (e.KeyValue == 38) // UP KEY
                {
                    lst.SelectedIndex = lst.SelectedIndex - 1;
                }
                else if (e.KeyValue == 40) // DOWN KEY
                {
                    lst.SelectedIndex = lst.SelectedIndex + 1;
                }
            }
            catch { }
        }
    }
}

// CODE FOR designer FILE
namespace WindowsApplication1
{
    partial class Form1
    {
        private System.ComponentModel.IContainer components = null;

        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows Form Designer generated code

        private void InitializeComponent()
        {
            this.txt = new System.Windows.Forms.TextBox();
            this.lst = new System.Windows.Forms.ListBox();
            this.SuspendLayout();
            // 
            // txt
            // 
            this.txt.Location = new System.Drawing.Point(40, 21);
            this.txt.Name = "txt";
            this.txt.Size = new System.Drawing.Size(325, 20);
            this.txt.TabIndex = 0;
            this.txt.TextChanged += new System.EventHandler(this.txt_TextChanged);
            this.txt.KeyDown += new System.Windows.Forms.KeyEventHandler(this.txt_KeyDown);
            this.txt.Leave += new System.EventHandler(this.txt_Leave);
            this.txt.Enter += new System.EventHandler(this.txt_Enter);
            // 
            // lst
            // 
            this.lst.FormattingEnabled = true;
            this.lst.Location = new System.Drawing.Point(12, 37);
            this.lst.Name = "lst";
            this.lst.Size = new System.Drawing.Size(10, 4);
            this.lst.TabIndex = 1;
            this.lst.Visible = false;
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(406, 309);
            this.Controls.Add(this.lst);
            this.Controls.Add(this.txt);
            this.Name = "Form1";
            this.Text = "Form1";
            this.Load += new System.EventHandler(this.Form1_Load);
            this.ResumeLayout(false);
            this.PerformLayout();

        }

        #endregion

        private System.Windows.Forms.TextBox txt;
        private System.Windows.Forms.ListBox lst;
    }
}
//-----------------------------------------------------------------------------------------------
// CODE FOR cs FILE
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        DataTable tblList = new DataTable();
        DataView dvList = null;

        public Form1()
        {
            InitializeComponent();
        }

        private void txt_TextChanged(object sender, EventArgs e)
        {
            dvList.RowFilter = "Item Like '" + txt.Text + "%'";
        }

        private void txt_Enter(object sender, EventArgs e)
        {
            lst.Width = txt.Width;
            lst.Height = 100;

            lst.Top = txt.Top + txt.Height;
            lst.Left = txt.Left;

            if (!lst.Visible)
                lst.Visible = true;
        }

        private void txt_Leave(object sender, EventArgs e)
        {
            if (lst.SelectedIndex != -1)
            {
                txt.Text = lst.Text;
            }
            else
            {
                txt.Text = "";
                MessageBox.Show("Please select from list only !");
            }

            lst.Visible = false;
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            tblList.Columns.Add("Item");

            tblList.Rows.Add("ONE");
            tblList.Rows.Add("TWO");
            tblList.Rows.Add("THREE");
            tblList.Rows.Add("FOUR");
            tblList.Rows.Add("FIVE");
            tblList.Rows.Add("SIX");
            tblList.Rows.Add("SEVEN");
            tblList.Rows.Add("EIGHT");
            tblList.Rows.Add("NINE");
            tblList.Rows.Add("TEN");

            lst.DisplayMember = "Item";

            lst.DataSource = tblList;

            dvList = tblList.DefaultView;
        }

        private void txt_KeyDown(object sender, KeyEventArgs e)
        {
            try
            {
                if (e.KeyValue == 38) // UP KEY
                {
                    lst.SelectedIndex = lst.SelectedIndex - 1;
                }
                else if (e.KeyValue == 40) // DOWN KEY
                {
                    lst.SelectedIndex = lst.SelectedIndex + 1;
                }
            }
            catch { }
        }
    }
}
//-----------------------------------------------------------------------------------------------

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