ASP.NET常用控件之1：用于选择日期的TextBox控件

将日常使用的日期选择用户控件进行了封装，是我写的第一个服务器控件，希望大家给些意见。


using System;


using System.ComponentModel;


using System.ComponentModel.Design;


using System.Web.UI;


using System.Web.UI.WebControls;




namespace Sdtcn.WebControls






{


[


Designer(typeof(Design.CompositeControlDesigner))


]


public abstract class CompositeControl :


WebControl, INamingContainer






{


public override ControlCollection Controls






{


get






{


EnsureChildControls();


return base.Controls;


}


}


}


}


using System;


using System.Web.UI;


using System.Web.UI.HtmlControls;


using System.Web.UI.WebControls;


using System.ComponentModel;


using System.ComponentModel.Design;




namespace Sdtcn.WebControls






{




/**//**//**//// <summary>


/// CustomCalendar 的摘要说明。


/// </summary>


public class CustomCalendar : CompositeControl






{


private TextBox _calendarTextBox;


private HtmlInputButton _selectInputButton;


private Calendar _calendar;




private static readonly object EventSelectChanged = new object();




private string display






{


get






{


if(ViewState["Display"] == null)


return "none";


else


return ViewState["Display"].ToString();


}


set






{


ViewState["Display"] = value;


}


}






代理子控件的属性代理子控件的属性#region 代理子控件的属性


[


Bindable(true),


Category("Appearance"),


DefaultValue(""),


Description("")


]


public string CalendarText






{


get






{


EnsureChildControls();


return _calendarTextBox.Text;


}


}




[


Bindable(true),


Category("Appearance"),


DefaultValue("Select"),


Description("选择日期按钮的名称")


]


public string SelectButtonText






{


get






{


EnsureChildControls();


return _selectInputButton.Value;


}


set






{


EnsureChildControls();


_selectInputButton.Value = value;


}


}






#endregion






事件事件#region 事件




[


Category("Action"),


Description("选择日期后触发的事件")


]


public event EventHandler SelectChanged






{


add






{


Events.AddHandler(EventSelectChanged,value);


}


remove






{


Events.RemoveHandler(EventSelectChanged,value);


}


}




protected virtual void OnSelectChanged(object sender, EventArgs e)






{


EventHandler selectChangedHandler = (EventHandler)Events[EventSelectChanged];


if(selectChangedHandler != null)






{


selectChangedHandler(this,e);


}


}




#endregion







private void _calendar_SelectionChanged(object sender, EventArgs e)






{


_calendarTextBox.Text = _calendar.SelectedDate.ToShortDateString();




System.Web.UI.Control div = Page.FindControl("divCalendar");




if(div is HtmlGenericControl)






{


((HtmlGenericControl)div).Style.Add("display","none");


}




OnSelectChanged(sender,e);




display = "none";


}




private void _calendar_VisibleMonthChanged(Object sender, MonthChangedEventArgs e)






{


display = "block";


}




public CustomCalendar()






{}




protected override void CreateChildControls()






{


Controls.Clear();




_calendarTextBox = new TextBox();


_calendarTextBox.ID = "calendarTextBox";


_calendarTextBox.ReadOnly = true;




_selectInputButton = new HtmlInputButton("button");


_selectInputButton.Attributes.Add("Onclick","OnClick()");





_calendar = new Calendar();


_calendar.SelectionChanged += new EventHandler(_calendar_SelectionChanged);


_calendar.VisibleMonthChanged += new MonthChangedEventHandler(_calendar_VisibleMonthChanged);




this.Controls.Add(_calendarTextBox);


this.Controls.Add(_selectInputButton);


this.Controls.Add(_calendar);


}




protected override void OnPreRender(EventArgs e)






{


base.OnPreRender (e);




string script = "<script language=JavaScript> function OnClick(){ if( divCalendar.style.display == /"none/") divCalendar.style.display = /"/"; else divCalendar.style.display = /"none/";}</script>";


Page.RegisterClientScriptBlock("script",script);


}




protected override void Render(System.Web.UI.HtmlTextWriter writer)






{


AddAttributesToRender(writer);




_calendarTextBox.RenderControl(writer);


_selectInputButton.RenderControl(writer);





writer.Write("<br>");


writer.RenderBeginTag(HtmlTextWriterTag.Div);


writer.AddAttribute(HtmlTextWriterAttribute.Id,"divCalendar");


writer.AddAttribute(HtmlTextWriterAttribute.Style,"DISPLAY:" + display + ";POSITION:absolute");


_calendar.RenderControl(writer);


writer.RenderEndTag();


}




}


}