c# winform combobox问题

[rogerlovewjh]

我需要实现象网页上一样,在下拉框中输入内容，那么combobox弹出的是从头开始匹配的相符数据。我这里需要的是只有相符合的数据出现在弹出框中，不符的不出现，有没有思路或者代码能够提供给小弟，小弟不胜感激！！！
我现在的代码是这样的

        private void cbxUserName_KeyUp(object sender, KeyEventArgs e)
        {
            if (cbxUserName.Items.Count != 0)
            {
                for (int i = 0; i < cbxUserName.Items.Count; i++)
                {
                    if (cbxUserName.Text.Trim().Length != 0)
                    {
                        if (cbxUserName.Items[i].ToString().Trim().StartsWith(cbxUserName.Text.Trim()))
                        {
                            cbxUserName.Text=cbxUserName.Items[i].ToString().Trim();
                            cbxUserName.DroppedDown = true;
                        }
                    }
                }
            }
 
        }

此代码存在两个问题：
1.当匹配好后，弹出框中出现的是全部数据，而不是出现相匹配的数据。
2.出现弹出框后，鼠标没有了！

[rogerlovewjh]

comboBox1.AutoCompleteMode = AutoCompleteMode.Suggest;
comboBox1.AutoCompleteSource = AutoCompleteSource.AllUrl;
正解！！！多谢大家！结贴！！！

[rogerlovewjh]

comboBox1.AutoCompleteSource = AutoCompleteSource.AllUrl; 不是AutoCompleteSource.AllUrl; 而是AutoCompleteSource.ListItems;这才是我要的！呵呵！

[liheng133542]

dig

[北京的雾霾天]

使用自动完成就可以了，给自动完成源设置你的数据源。

[lee118]

ComboBox.AutoCompleteMode 属性

[zt_100094]

ComboBox.AutoCompleteMode 属性

[rogerlovewjh]

各位能说详细点吗？我是刚刚学的，很多不是很懂

[warrior]

同上，设置AutoCompleteMode和AutoCompleteSource

[paulin]

comboBox1.AutoCompleteMode = AutoCompleteMode.Suggest;
comboBox1.AutoCompleteSource = AutoCompleteSource.AllUrl;

[brallow]

我的代码：
1：响应TextChanged事件
2：先备份所有的Items，在变化时先清空，再一一添加。

private List<object> itemsAll;

private void BackupAllItems()
{
    if (itemsAll == null) itemsAll = new List<object>();

    foreach (object o in comboBox1.Items)
    {
        itemsAll.Add(o);
    }
}

private void comboBox1_TextChanged(object sender, EventArgs e)
{
    if (itemsAll == null) BackupAllItems();


    comboBox1.Items.Clear();
    foreach (var i in itemsAll)
    {
        if (i.ToString().StartsWith(comboBox1.Text.Trim()))
        {
            comboBox1.Items.Add(i);
        }
    }
    comboBox1.DroppedDown = true;
}

[warrior]

看这里：http://www.cnblogs.com/frederick-liu/archive/2005/11/25/284547.html

[gxingmin]

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace Auto_Complete_ComboBox
{
	/// <summary>
	/// Summary description for Form1.
	/// </summary>
	public class frmAutoCompleteComboBox : System.Windows.Forms.Form
	{
		internal System.Windows.Forms.Label lblTest;
		internal System.Windows.Forms.CheckBox chkLimitToList;
		internal System.Windows.Forms.CheckBox chkAutoComplete;
		internal System.Windows.Forms.ComboBox cbAutoComplete;
		/// <summary>
		/// Required designer variable.
		/// </summary>
		private System.ComponentModel.Container components = null;

		public frmAutoCompleteComboBox()
		{
			//
			// Required for Windows Form Designer support
			//
			InitializeComponent();

			//
			// TODO: Add any constructor code after InitializeComponent call
			//
		}

		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (components != null) 
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}

[gxingmin]

#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.lblTest = new System.Windows.Forms.Label();
			this.chkLimitToList = new System.Windows.Forms.CheckBox();
			this.chkAutoComplete = new System.Windows.Forms.CheckBox();
			this.cbAutoComplete = new System.Windows.Forms.ComboBox();
			this.SuspendLayout();
			// 
			// lblTest
			// 
			this.lblTest.AutoSize = true;
			this.lblTest.Location = new System.Drawing.Point(8, 151);
			this.lblTest.Name = "lblTest";
			this.lblTest.Size = new System.Drawing.Size(0, 16);
			this.lblTest.TabIndex = 7;
			// 
			// chkLimitToList
			// 
			this.chkLimitToList.Checked = true;
			this.chkLimitToList.CheckState = System.Windows.Forms.CheckState.Checked;
			this.chkLimitToList.FlatStyle = System.Windows.Forms.FlatStyle.System;
			this.chkLimitToList.Location = new System.Drawing.Point(208, 39);
			this.chkLimitToList.Name = "chkLimitToList";
			this.chkLimitToList.Size = new System.Drawing.Size(80, 16);
			this.chkLimitToList.TabIndex = 2;
			this.chkLimitToList.Text = "Limit to List";
			// 
			// chkAutoComplete
			// 
			this.chkAutoComplete.Checked = true;
			this.chkAutoComplete.CheckState = System.Windows.Forms.CheckState.Checked;
			this.chkAutoComplete.FlatStyle = System.Windows.Forms.FlatStyle.System;
			this.chkAutoComplete.Location = new System.Drawing.Point(208, 15);
			this.chkAutoComplete.Name = "chkAutoComplete";
			this.chkAutoComplete.Size = new System.Drawing.Size(96, 16);
			this.chkAutoComplete.TabIndex = 1;
			this.chkAutoComplete.Text = "Auto Complete";
			// 
			// cbAutoComplete
			// 
			this.cbAutoComplete.Items.AddRange(new object[] {
																"Aaron Alex",
																"Baron Bud",
																"Aarts Jan",
																"Zicari Roberto"});
			this.cbAutoComplete.Location = new System.Drawing.Point(16, 15);
			this.cbAutoComplete.MaxDropDownItems = 10;
			this.cbAutoComplete.Name = "cbAutoComplete";
			this.cbAutoComplete.Size = new System.Drawing.Size(176, 21);
			this.cbAutoComplete.TabIndex = 0;
			this.cbAutoComplete.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.cbAutoComplete_KeyPress);
			// 
			// frmAutoCompleteComboBox
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
			this.ClientSize = new System.Drawing.Size(312, 182);
			this.Controls.Add(this.lblTest);
			this.Controls.Add(this.chkLimitToList);
			this.Controls.Add(this.chkAutoComplete);
			this.Controls.Add(this.cbAutoComplete);
			this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle;
			this.MaximizeBox = false;
			this.Name = "frmAutoCompleteComboBox";
			this.Text = "Auto Complete ComboBox - Example";
			this.ResumeLayout(false);

		}
		#endregion

[gxingmin]

[STAThread]
		static void Main() 
		{
			Application.Run(new frmAutoCompleteComboBox());
		}

		private void cbAutoComplete_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)
		{
			if (this.chkAutoComplete.Checked)
				this.AutoComplete(this.cbAutoComplete, e, this.chkAutoComplete.Checked);
		}

        
		
		// AutoComplete
		public void AutoComplete(ComboBox cb, System.Windows.Forms.KeyPressEventArgs e)
		{
			this.AutoComplete(cb, e, false);
		}

		public void AutoComplete(ComboBox cb, System.Windows.Forms.KeyPressEventArgs e, bool blnLimitToList)
		{
			string strFindStr = "";

			if (e.KeyChar == (char)8) 
			{
				if (cb.SelectionStart <= 1) 
				{
					cb.Text = "";
					return;
				}

				if (cb.SelectionLength == 0)
					strFindStr = cb.Text.Substring(0, cb.Text.Length - 1);
						else 
					strFindStr = cb.Text.Substring(0, cb.SelectionStart - 1);
					}
			else 
			{
				if (cb.SelectionLength == 0)
					strFindStr = cb.Text + e.KeyChar;
				else
					strFindStr = cb.Text.Substring(0, cb.SelectionStart) + e.KeyChar;
			}

			int intIdx = -1;

			// Search the string in the ComboBox list.
			
			intIdx = cb.FindString(strFindStr);
 
			if (intIdx != -1)
			{
				cb.SelectedText = "";
				cb.SelectedIndex = intIdx;
				cb.SelectionStart = strFindStr.Length;
				cb.SelectionLength = cb.Text.Length;
				e.Handled = true;
			}
			else
			{
				e.Handled = blnLimitToList;
			}

		}


	}
}

[gxingmin]

把上面三段代码复制并替换到一个窗体里即可

[Anderslu]

comboBox1.AutoCompleteSource = AutoCompleteSource.ListItems;

[lussnailatnet]

还有鼠标的问题呢？

[luochaoc]

可看性很强！！

[NowtAngell]

只有UP的份了...

[cooolchen]

好。