asp.net自定义一个控件可输入的下拉框

yanghua_yanghua 2012-02-22 03:39:51

我想自定义一个控件。可输入的下拉框。但是不太会定义啊。环境vs2008

<asp:TextBox ID="TextBox1" runat="server" ></asp:TextBox>

<span style="width:18px;border:0px solid red; position:relative; ">
<asp:DropDownList ID="DropDownList1" runat="server" ></asp:DropDownList>
</span>

还要对span设置样式。我都不会。希望各位大侠指点一下呀

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yanghua_yanghua 2012-02-24

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问题已解决。http://download.csdn.net/download/himajie/2613203
谢谢各位帮忙。

冰镇宝贝321 2012-02-24

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这个是设计界面代码



namespace Ex060

{

    partial class Form1

    {

        /// <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 Windows 窗体设计器生成的代码



        /// <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.label1 = new System.Windows.Forms.Label();

            this.comboBox1 = new System.Windows.Forms.ComboBox();

            this.btnAdd = new System.Windows.Forms.Button();

            this.SuspendLayout();

            // 

            // label1

            // 

            this.label1.AutoSize = true;

            this.label1.Location = new System.Drawing.Point(40, 53);

            this.label1.Name = "label1";

            this.label1.Size = new System.Drawing.Size(29, 12);

            this.label1.TabIndex = 0;

            this.label1.Text = "年级";

            // 

            // comboBox1

            // 

            this.comboBox1.FormattingEnabled = true;

            this.comboBox1.Items.AddRange(new object[] {

            "2004级",

            "2005级"});

            this.comboBox1.Location = new System.Drawing.Point(93, 53);

            this.comboBox1.Name = "comboBox1";

            this.comboBox1.Size = new System.Drawing.Size(121, 20);

            this.comboBox1.TabIndex = 1;

            this.comboBox1.SelectedIndexChanged += new System.EventHandler(this.comboBox1_SelectedIndexChanged);

            this.comboBox1.TextChanged += new System.EventHandler(this.comboBox1_SelectedIndexChanged);

            // 

            // btnAdd

            // 

            this.btnAdd.Location = new System.Drawing.Point(93, 99);

            this.btnAdd.Name = "btnAdd";

            this.btnAdd.Size = new System.Drawing.Size(75, 23);

            this.btnAdd.TabIndex = 2;

            this.btnAdd.Text = "添加";

            this.btnAdd.UseVisualStyleBackColor = true;

            this.btnAdd.Click += new System.EventHandler(this.btnAdd_Click);

            // 

            // Form1

            // 

            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);

            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;

            this.ClientSize = new System.Drawing.Size(265, 156);

            this.Controls.Add(this.btnAdd);

            this.Controls.Add(this.comboBox1);

            this.Controls.Add(this.label1);

            this.Name = "Form1";

            this.Text = "根据输入增加选项";

            this.ResumeLayout(false);

            this.PerformLayout();



        }



        #endregion



        private System.Windows.Forms.Label label1;

        private System.Windows.Forms.ComboBox comboBox1;

        private System.Windows.Forms.Button btnAdd;

    }

}

冰镇宝贝321 2012-02-24

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我这有个代码是

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;



namespace Ex060

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }



        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)

        {

            //if (comboBox1.Text != "")

            //{

            //   string newItem=comboBox1.Text.Trim(); 

            //    for (int i = 0; i < comboBox1.Items.Count; i++)

            //    {

            //        if (string.Compare(newItem, comboBox1.Items[i].ToString()) == 1)

            //        {

            //            MessageBox.Show("组合框中已有相同项，不能再添加！");

            //            return;

            //        }

            //        else

            //            comboBox1.Items.Add(comboBox1.Text.Trim());



            //    }

                    

            //}

        }



        private void btnAdd_Click(object sender, EventArgs e)

        {

            if (comboBox1.Text != "")

            {

                string newItem = comboBox1.Text.Trim();//获取输入文本

                bool flag = false;//标识变量

                for (int i = 0; i < comboBox1.Items.Count; i++)

                {

                  //判断是否有相同项

                    if (string.Compare(newItem, comboBox1.Items[i].ToString()) == 0)

                    {

                        flag = true;

                        MessageBox.Show("已经有相同项，不能再添加");



                    }

                   

                }

                if (flag == false)

                { 

                

                  comboBox1.Items.Add(newItem);//将输入文本添加到项中

                  comboBox1.Text = "";



                }



            }



        }

    }

}

myhope88 2012-02-24

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路过，帮顶下

yanghua_yanghua 2012-02-24

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[Quote=引用 5 楼 insus 的回复:]
参考(第二个搜索功能)：
http://www.cnblogs.com/insus/archive/2011/11/25/2263185.html
[/Quote]
非常感谢你呀。可我想要的不是这样的啊。vs2008里的dropdownlist只能选择不能自己输入。可我也想在下拉框中没有想要的选项就自己输入的功能。所以想自己写个用户控件。