如何重载ComboBox 使其下拉按钮（带下箭头的）和下拉列表的垂直滚动条的宽度改变？（自绘ComboBox）

原文地址：http://bbs.csdn.net/topics/390135022

http://blog.csdn.net/scsdn/article/details/4363299

想使用winform的combox控件，但是觉得控件太小了，想在触摸屏上使用，感觉combox后面的下拉选择的三角形太小了，combox的宽度也太小了，请问下，combox的这些属性，可以更改吗？能够使小三角形大一些嘛？能够使combox的宽度宽些不？请大家给予帮助，谢谢

 

设置字体可以使得combobox变大。

combobox,listview等一些控件的外观会由于字体大小的改变而改变。

这个没办法。
除非重绘
http://blog.csdn.net/scsdn/article/details/4363299

 

关于如何重载ComboBox 使其下拉按钮（带下箭头的）和下拉列表的垂直滚动条的宽度改变的问题，通过自绘自定义控件得以解决。

ComboBoxDIY.cs文件

//ComboBoxDIY.cs
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Text;
using System.Windows.Forms;

namespace WindowsApplication7
{
    public partial class ComboBoxDIY : UserControl
    {
        public bool buttondown = false;
        public ComboBoxDIY()
        {
            InitializeComponent();
            this.listBox1.Visible = false;
            this.vScrollBar1.Visible = false;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            //下拉按钮未曾按下
            if (this.buttondown==false)
            {
                //listbox所有数据的项数
                int count = this.listBox1.Items.Count;
                //获取listbox所能显示的项数
                int displaycount = this.listBox1.Height / this.listBox1.ItemHeight;
                //滚动条显示的最大值
                int scrollmax = 0;
                //垂直方向上显示内容数目大于所能显示的数目时
                //垂直滚动条直接可见
                if (count > displaycount)
                {
                    scrollmax = count - 1;
                    this.vScrollBar1.Visible = true;
                }
                this.vScrollBar1.LargeChange = displaycount;
                this.vScrollBar1.Maximum = scrollmax;
                this.vScrollBar1.Minimum = 0;
                this.vScrollBar1.Scroll += new ScrollEventHandler(vscroll);

                this.listBox1.Visible = true;
                //下拉按钮按下
                this.buttondown = true;
            }
            //下拉按钮已按下
            else
            {
                if(this.vScrollBar1.Visible)this.vScrollBar1.Visible = false;
                this.listBox1.Visible = false;
                //下拉按钮弹起
                this.buttondown = false;
            }
        }

        private void vscroll(object sender, ScrollEventArgs e)
        {
            //ScrollBar控制listBox滚动
            this.listBox1.TopIndex=e.NewValue;
        }

        private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            //文本框显示选择结果
            this.textBox1.Text =this.listBox1.Items[this.listBox1.SelectedIndex].ToString();
            this.vScrollBar1.Visible = false;
            this.listBox1.Visible = false;
            //下拉按钮弹起
            this.buttondown = false;
        }
    }
}

//ComboBoxDIY.cs using System; using System.Collections.Generic; using System.ComponentModel; using System.Drawing; using System.Data; using System.Text; using System.Windows.Forms; namespace WindowsApplication7 { public partial class ComboBoxDIY : UserControl { public bool buttondown = false; public ComboBoxDIY() { InitializeComponent(); this.listBox1.Visible = false; this.vScrollBar1.Visible = false; } private void button1_Click(object sender, EventArgs e) { //下拉按钮未曾按下 if (this.buttondown==false) { //listbox所有数据的项数 int count = this.listBox1.Items.Count; //获取listbox所能显示的项数 int displaycount = this.listBox1.Height / this.listBox1.ItemHeight; //滚动条显示的最大值 int scrollmax = 0; //垂直方向上显示内容数目大于所能显示的数目时 //垂直滚动条直接可见 if (count > displaycount) { scrollmax = count - 1; this.vScrollBar1.Visible = true; } this.vScrollBar1.LargeChange = displaycount; this.vScrollBar1.Maximum = scrollmax; this.vScrollBar1.Minimum = 0; this.vScrollBar1.Scroll += new ScrollEventHandler(vscroll); this.listBox1.Visible = true; //下拉按钮按下 this.buttondown = true; } //下拉按钮已按下 else { if(this.vScrollBar1.Visible)this.vScrollBar1.Visible = false; this.listBox1.Visible = false; //下拉按钮弹起 this.buttondown = false; } } private void vscroll(object sender, ScrollEventArgs e) { //ScrollBar控制listBox滚动 this.listBox1.TopIndex=e.NewValue; } private void listBox1_SelectedIndexChanged(object sender, EventArgs e) { //文本框显示选择结果 this.textBox1.Text =this.listBox1.Items[this.listBox1.SelectedIndex].ToString(); this.vScrollBar1.Visible = false; this.listBox1.Visible = false; //下拉按钮弹起 this.buttondown = false; } } }

 

ComboBoxDIY.Designer.cs文件

//ComboBoxDIY.Designer.cs
namespace WindowsApplication7
{
    partial class ComboBoxDIY
    {
        /// <summary>
        /// 必需的设计器变量。
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// 清理所有正在使用的资源。
        /// </summary>
        /// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region 组件设计器生成的代码

        /// <summary>
        /// 设计器支持所需的方法 - 不要
        /// 使用代码编辑器修改此方法的内容。
        /// </summary>
        private void InitializeComponent()
        {
            this.button1 = new System.Windows.Forms.Button();
            this.textBox1 = new System.Windows.Forms.TextBox();
            this.listBox1 = new System.Windows.Forms.ListBox();
            this.vScrollBar1 = new System.Windows.Forms.VScrollBar();
            this.SuspendLayout();
            //
            // button1
            //
            this.button1.Location = new System.Drawing.Point(85, 0);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(65, 44);
            this.button1.TabIndex = 0;
            this.button1.Text = "▼";
            this.button1.UseVisualStyleBackColor = true;
            this.button1.Click += new System.EventHandler(this.button1_Click);
            //
            // textBox1
            //
            this.textBox1.Font = new System.Drawing.Font("宋体", 24F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
            this.textBox1.Location = new System.Drawing.Point(0, 0);
            this.textBox1.Name = "textBox1";
            this.textBox1.Size = new System.Drawing.Size(88, 44);
            this.textBox1.TabIndex = 1;
            //
            // listBox1
            //
            this.listBox1.Font = new System.Drawing.Font("宋体", 24F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
            this.listBox1.FormattingEnabled = true;
            this.listBox1.ItemHeight = 33;
            this.listBox1.Items.AddRange(new object[] {
            "0",
            "1",
            "2",
            "3",
            "4",
            "5",
            "6",
            "7",
            "8",
            "9"});
            this.listBox1.Location = new System.Drawing.Point(0, 44);
            this.listBox1.Name = "listBox1";
            this.listBox1.Size = new System.Drawing.Size(148, 103);
            this.listBox1.TabIndex = 2;
            this.listBox1.SelectedIndexChanged += new System.EventHandler(this.listBox1_SelectedIndexChanged);
            //
            // vScrollBar1
            //
            this.vScrollBar1.Location = new System.Drawing.Point(85, 44);
            this.vScrollBar1.Name = "vScrollBar1";
            this.vScrollBar1.Size = new System.Drawing.Size(63, 103);
            this.vScrollBar1.TabIndex = 3;
            //
            // UserControl1
            //
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.Controls.Add(this.vScrollBar1);
            this.Controls.Add(this.listBox1);
            this.Controls.Add(this.textBox1);
            this.Controls.Add(this.button1);
            this.Name = "UserControl1";
            this.Size = new System.Drawing.Size(149, 148);
            this.ResumeLayout(false);
            this.PerformLayout();

        }

        #endregion

        private System.Windows.Forms.Button button1;
        private System.Windows.Forms.TextBox textBox1;
        private System.Windows.Forms.ListBox listBox1;
        private System.Windows.Forms.VScrollBar vScrollBar1;

    }
}