求一个自定义控件

Question

最进做验证textbox的时候老是要求验证,单个拖控件工作量太大了
谁能帮我提供1个比较简单的textbox控件,只要实现对该textbox验证不能为空或着只能输入数字

Answer 1

自己把TextBox和RequireFieldValidor封装成一个控件就行了

Answer 2

比较简单啊.俺是先建立一个类关系图，然后生成框架，再修改，这样可以利用vs的自动代码生成功能.
using System;
using System.Collections.Generic;
using System.Text;
using System.ComponentModel;namespace SutsComponent
{
    public class SutsNumberBox : System.Windows.Forms.TextBox
    {
        public SutsNumberBox()
            : base()
        {
            InitializeComponent();
        }
        private void InitializeComponent()
        {
            this.SuspendLayout();
            // 
            // SutsNumberBox
            // 
            this.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
            this.TextAlign = System.Windows.Forms.HorizontalAlignment.Right;
            this.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.SutsNumberBox_KeyPress);
            this.TextChanged += new System.EventHandler(this.SutsNumberBox_TextChanged);
            this.ResumeLayout(false);        }        private void SutsNumberBox_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)
        {
            if ((e.KeyChar >= '0' && e.KeyChar <= '9') ||
                (e.KeyChar == '.' && Text.IndexOf('.') < 0) ||
                e.KeyChar == '\b' || e.KeyChar == '\r' || e.KeyChar == '\t')
            {
                e.Handled = false;
            }
            else
                e.Handled = true;
        }        private void SutsNumberBox_TextChanged(object sender, EventArgs e)
        {
            if (Text == "")
            {
                Text = "0";
            }
        }        public double GetValue()
        {
            try
            {
                return Convert.ToDouble(Text.Trim());
            }
            catch
            {
                return 0;
            }
        }        [Description("得到或设置文本框中的数值!"), Category("表达式")]
        public double DoubleValue
        {
            set
            {
                Text = value.ToString();
            }
            get
            {
                return GetValue();
            }
        }
    }
}

Answer 3

用用户控件来做,把TEXTBOX结合JS或RequireFieldValidor来做
或自己写自定义控件.类似4楼的.

Answer 4

复合控件，可以参考这个方法，讲得还算详细
http://hi.baidu.com/5imilan/blog/item/7a2de6dd342a28305982dde6.html
记得还有一篇讲得更好的，现在找不到了

Answer 5

可以参考discuz!NT的源码
里面就有这个集成验证功能的TextBox控件

Answer 6

 public class CustomerControl:Control 
    {
        /// <summary>
        /// 要应用控件的状态，必须重写三个方法 方法1 OnInit（）
        /// 在页面注册 将控件注册为持久化地控件
        /// </summary>
        /// <param name="e"></param>
        protected override void OnInit(EventArgs e)
        {
            Page.RegisterRequiresControlState(this);
            base.OnInit(e);
        }
        protected override object  SaveControlState()
        {
            return this.Text;
        }
        protected override void  LoadControlState(object savedState)
        {
            this.Text = savedState.ToString();
        }     
        public virtual string Text
        {
            get
            {
                if (ViewState["Text"] != null)
                {
                    return ViewState["Text"].ToString();
                }
                return null;
            }
            set
            {
                if ((value != "") && (是否数字))
                {
                    ViewState["Text"] = value;
                }
                else
                {
                    ViewState["Text"] = "";
                }                
            }        }      
        protected override void Render(HtmlTextWriter writer)
        {
            writer.AddAttribute(HtmlTextWriterAttribute.Value, this.Text);
            writer.AddAttribute(HtmlTextWriterAttribute.Width, "150");
            writer.AddAttribute(HtmlTextWriterAttribute.Id, "text1");
            writer.AddAttribute(HtmlTextWriterAttribute.Type, "text");
            writer.RenderBeginTag (HtmlTextWriterTag.Input);
            writer.RenderEndTag ();
            writer.RenderEndTag ();
        }    }