关于继承扩展ASP.NET控件(以Textbox为例)
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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))]
publicclass DecimalTextbox : TextBox
{
protectedoverridevoid OnInit(EventArgs e)
{
base.OnInit(e);
}
#region New properties
privatebool _IsRequired = false;
[TypeConverter(typeof(BooleanConverter))]
publicbool IsRequired
{
get
{
if (ViewState[this.ID + "_IsRequired"] != null)
{
return (bool)ViewState[this.ID + "_IsRequired"];
}
else
{
ViewState[this.ID + "_IsRequired"] = this._IsRequired;
returnthis._IsRequired;
}
}
set
{
ViewState[this.ID + "_IsRequired"] = value;
}
}
[TypeConverter(typeof(DecimalConverter))]
publicdecimal Value
{
get
{
Regex reg = new Regex(this.ValidationExpression);
if (reg.IsMatch(this.RawText))
{
return Convert.ToDecimal(base.Text.Replace(",", "").Replace("$", ""));
}
else
{
return0;
}
}
}
privatestring _ValidationExpression = @"^\$?-?[1-9]\d*$|^\$?-?0(\.\d+)$|^\$?-?[1-9]\d*(\.\d+)$|^\$?-?([1-9]{0,3},)(\d{3},)*(\d{3})(\.\d+)?$|^\$?-?0(\.\d+)?$|^\$?-?[1-9]\d{0,2}(\.\d+)?$";
[TypeConverter(typeof(StringConverter))]
publicstring ValidationExpression
{
get
{
if (ViewState[this.ID + "_ValidationExpression"] != null)
{
return (string)ViewState[this.ID + "_ValidationExpression"];
}
else
{
ViewState[this.ID + "_ValidationExpression"] = this._ValidationExpression;
returnthis._ValidationExpression;
}
}
set
{
ViewState[this.ID + "_ValidationExpression"] = value;
}
}
privatebool _IsNeedThousandSeparator = true;
[TypeConverter(typeof(BooleanConverter))]
publicbool IsNeedThousandSeparator
{
get
{
if (ViewState[this.ID + "_IsNeedThousandSeparator"] != null)
{
return (bool)ViewState[this.ID + "_IsNeedThousandSeparator"];
}
else
{
ViewState[this.ID + "_IsNeedThousandSeparator"] = this._IsNeedThousandSeparator;
returnthis._IsNeedThousandSeparator;
}
}
set
{
ViewState[this.ID + "_IsNeedThousandSeparator"] = value;
}
}
privateint _DecimalPlaces = 2;
[TypeConverter(typeof(Int32Converter))]
publicint DecimalPlaces
{
get
{
if (ViewState[this.ID + "_DecimalPlaces"] != null)
{
return (int)ViewState[this.ID + "_DecimalPlaces"];
}
else
{
ViewState[this.ID + "_DecimalPlaces"] = this._DecimalPlaces;
returnthis._DecimalPlaces;
}
}
set
{
ViewState[this.ID + "_DecimalPlaces"] = value;
}
}
privatebool _IsNeedDollarSignal = false;
[TypeConverter(typeof(BooleanConverter))]
publicbool IsNeedDollarSignal
{
get
{
if (ViewState[this.ID + "_IsNeedDollarSignal"] != null)
{
return (bool)ViewState[this.ID + "_IsNeedDollarSignal"];
}
else
{
ViewState[this.ID + "_IsNeedDollarSignal"] = this._IsNeedDollarSignal;
returnthis._IsNeedDollarSignal;
}
}
set
{
ViewState[this.ID + "_IsNeedDollarSignal"] = value;
}
}
privatestring _DollarSignal = "$";
[TypeConverter(typeof(StringConverter))]
publicstring DollarSignal
{
get
{
if (ViewState[this.ID + "_DollarSignal"] != null)
{
return (string)ViewState[this.ID + "_DollarSignal"];
}
else
{
ViewState[this.ID + "_DollarSignal"] = this._DollarSignal;
returnthis._DollarSignal;
}
}
set
{
ViewState[this.ID + "_DollarSignal"] = value;
}
}
privatestring 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;
}
}
privatestring _RawText = string.Empty;
publicstring RawText
{
get
{
if (ViewState[this.ID + "_RawText"] != null)
{
return (string)ViewState[this.ID + "_RawText"];
}
else
{
ViewState[this.ID + "_RawText"] = this._RawText;
returnthis._RawText;
}
}
privateset
{
ViewState[this.ID + "_RawText"] = value;
}
}
#endregion#region Override properties
publicoverridestring SkinID
{
get
{
if (this.IsRequired)
{
return"DecimalRequired";
}
else
{
return"Decimal";
}
}
set
{
base.SkinID = value;
}
}
publicoverridestring Text
{
get
{
return ToDecimalFormatString(base.Text);
}
set
{
this.RawText = value;
base.Text = ToDecimalString(value);
}
}
#endregion#region New functions
protectedstring ToDecimalString(string orignal)
{
Regex reg = new Regex(this.ValidationExpression);
if (reg.IsMatch(orignal))
{
return orignal.Replace(",", "").Replace("$", "");
}
else
{
returnstring.Empty;
}
}
protectedstring ToDecimalFormatString(string orignal)
{
if (!string.IsNullOrEmpty(orignal))
{
returnthis.Value.ToString(FormatString);
}
return orignal;
}
#endregion
}
}
有一下几个自定义属性可以设置:
IsRequired="True" 是否必填, 我这里只是控制SkinID.
IsNeedThousandSeparator="True"
这里是控制是否显示千位符
DecimalPlaces="2" 这里是控制小数位数
IsNeedDollarSignal="False" 这里是控制是否显示$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.
原文：http://www.cnblogs.com/xachary/p/3732262.html
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