首页 > 代码库 > 关于继承扩展ASP.NET控件(以Textbox为例)
关于继承扩展ASP.NET控件(以Textbox为例)
以下是一个相对简陋的扩展, 主要是针对金额显示的Textbox扩展.
using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI.WebControls; using System.ComponentModel; using System.Web.UI; using System.Text.RegularExpressions; [assembly: TagPrefix("XXX.Web.Controls", "XXX")] namespace XXX.Web.Controls { [ToolboxData("<{0}:DecimalTextbox runat=server></{0}:DecimalTextbox>")] [Designer(typeof(XXX.Web.Controls.DecimalTextbox))] public class DecimalTextbox : TextBox { protected override void OnInit(EventArgs e) { base.OnInit(e); } #region New properties private bool _IsRequired = false; [TypeConverter(typeof(BooleanConverter))] public bool IsRequired { get { if (ViewState[this.ID + "_IsRequired"] != null) { return (bool)ViewState[this.ID + "_IsRequired"]; } else { ViewState[this.ID + "_IsRequired"] = this._IsRequired; return this._IsRequired; } } set { ViewState[this.ID + "_IsRequired"] = value; } } [TypeConverter(typeof(DecimalConverter))] public decimal Value { get { Regex reg = new Regex(this.ValidationExpression); if (reg.IsMatch(this.RawText)) { return Convert.ToDecimal(base.Text.Replace(",", "").Replace("$", "")); } else { return 0; } } } private string _ValidationExpression = @"^\$?-?[1-9]\d*$|^\$?-?0(\.\d+)$|^\$?-?[1-9]\d*(\.\d+)$|^\$?-?([1-9]{0,3},)(\d{3},)*(\d{3})(\.\d+)?$|^\$?-?0(\.\d+)?$|^\$?-?[1-9]\d{0,2}(\.\d+)?$"; [TypeConverter(typeof(StringConverter))] public string ValidationExpression { get { if (ViewState[this.ID + "_ValidationExpression"] != null) { return (string)ViewState[this.ID + "_ValidationExpression"]; } else { ViewState[this.ID + "_ValidationExpression"] = this._ValidationExpression; return this._ValidationExpression; } } set { ViewState[this.ID + "_ValidationExpression"] = value; } } private bool _IsNeedThousandSeparator = true; [TypeConverter(typeof(BooleanConverter))] public bool IsNeedThousandSeparator { get { if (ViewState[this.ID + "_IsNeedThousandSeparator"] != null) { return (bool)ViewState[this.ID + "_IsNeedThousandSeparator"]; } else { ViewState[this.ID + "_IsNeedThousandSeparator"] = this._IsNeedThousandSeparator; return this._IsNeedThousandSeparator; } } set { ViewState[this.ID + "_IsNeedThousandSeparator"] = value; } } private int _DecimalPlaces = 2; [TypeConverter(typeof(Int32Converter))] public int DecimalPlaces { get { if (ViewState[this.ID + "_DecimalPlaces"] != null) { return (int)ViewState[this.ID + "_DecimalPlaces"]; } else { ViewState[this.ID + "_DecimalPlaces"] = this._DecimalPlaces; return this._DecimalPlaces; } } set { ViewState[this.ID + "_DecimalPlaces"] = value; } } private bool _IsNeedDollarSignal = false; [TypeConverter(typeof(BooleanConverter))] public bool IsNeedDollarSignal { get { if (ViewState[this.ID + "_IsNeedDollarSignal"] != null) { return (bool)ViewState[this.ID + "_IsNeedDollarSignal"]; } else { ViewState[this.ID + "_IsNeedDollarSignal"] = this._IsNeedDollarSignal; return this._IsNeedDollarSignal; } } set { ViewState[this.ID + "_IsNeedDollarSignal"] = value; } } private string _DollarSignal = "$"; [TypeConverter(typeof(StringConverter))] public string DollarSignal { get { if (ViewState[this.ID + "_DollarSignal"] != null) { return (string)ViewState[this.ID + "_DollarSignal"]; } else { ViewState[this.ID + "_DollarSignal"] = this._DollarSignal; return this._DollarSignal; } } set { ViewState[this.ID + "_DollarSignal"] = value; } } private string FormatString { get { string pre = string.Empty; if (this.IsNeedDollarSignal) { pre += this.DollarSignal; } if (this.IsNeedThousandSeparator) { pre += "#,###"; } else { pre += "#"; } if (this.DecimalPlaces > 0) { pre += "."; for (int i = 1; i < this.DecimalPlaces; i++) { pre += "#"; } pre += "0"; } return pre; } } private string _RawText = string.Empty; public string RawText { get { if (ViewState[this.ID + "_RawText"] != null) { return (string)ViewState[this.ID + "_RawText"]; } else { ViewState[this.ID + "_RawText"] = this._RawText; return this._RawText; } } private set { ViewState[this.ID + "_RawText"] = value; } } #endregion #region Override properties public override string SkinID { get { if (this.IsRequired) { return "DecimalRequired"; } else { return "Decimal"; } } set { base.SkinID = value; } } public override string Text { get { return ToDecimalFormatString(base.Text); } set { this.RawText = value; base.Text = ToDecimalString(value); } } #endregion #region New functions protected string ToDecimalString(string orignal) { Regex reg = new Regex(this.ValidationExpression); if (reg.IsMatch(orignal)) { return orignal.Replace(",", "").Replace("$", ""); } else { return string.Empty; } } protected string ToDecimalFormatString(string orignal) { if (!string.IsNullOrEmpty(orignal)) { return this.Value.ToString(FormatString); } return orignal; } #endregion } }
有一下几个自定义属性可以设置:
IsRequired="True" 是否必填, 我这里只是控制SkinID.
IsNeedThousandSeparator="True" 这里是控制是否显示千位符
DecimalPlaces="2" 这里是控制小数位数
IsNeedDollarSignal="False" 这里是控制是否显示$符号
求助:
ASP.NET自带的控件, 用Toolbox拖入, 某些属性例如"Text"会显示在插入的控件页面代码上
若我现在有一个自定义的属性想在拖入页面的时候, 就在页面代码上就出现(包括默认值). 不知道如何实现, 希望高人指点.
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