实现了IPostBackEventHandler接口的TextBox

王朝c#·作者佚名  2006-12-17
窄屏简体版  字體: |||超大  

using System;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.ComponentModel;

namespace PEONormalControl

...{

/**//// <summary>

/// 回传事件参数类型

/// </summary>

public class EventTextBoxEventArgs:EventArgs

...{

private string _ToAppend;

EventTextBoxEventArgs()

...{

}

public EventTextBoxEventArgs(String ArgText)

...{

this._ToAppend=ArgText;

}

/**//// <summary>

/// 回传事件参数

/// </summary>

public String ArgText

...{

get...{return _ToAppend;}

set...{_ToAppend =value;}

}

}

/**//// <summary>

/// 从TextBox继承,实现了IPostBackEventHandler接口

/// </summary>

[DefaultProperty('Text'),

ToolboxData('<{0}:EventTextBox runat=server></{0}:EventTextBox>')]

public class EventTextBox : System.Web.UI.WebControls.TextBox,IPostBackEventHandler

...{

//private string text;

private static readonly object objEventChangedKey;

public delegate void EventChangedHandler(object sender,EventTextBoxEventArgs e);

[Bindable(false),

Category('Appearance'),

DefaultValue('')]

public string PrefixText

...{

get

...{ if (ViewState['PrefixText'] == null)

return '';

else

return ViewState['PrefixText'].ToString() ;

}

set

...{

ViewState['PrefixText'] = value;

}

}

/**//// <summary>

/// 引起回传的事件名称

/// </summary>

[Bindable(false),

Category('Behavior'),

DefaultValue(''),Description('引起回传的事件名称')]

public string EventName

...{

get

...{ if (ViewState['EventName'] == null)

return '';

else

return ViewState['EventName'].ToString() ;

}

set

...{

ViewState['EventName'] = value;

}

}

/**//// <summary>

/// 回传事件参数

/// </summary>

[Bindable(false),

Category('Behavior'),

DefaultValue(''),Description('回传事件参数')]

public string EventArgText

...{

get

...{ if (ViewState['EventArgText'] == null)

return '';

else

return ViewState['EventArgText'].ToString() ;

}

set

...{

ViewState['EventArgText'] = value;

}

}

/**//// <summary>

/// 用户自定义的回传函数

/// </summary>

[Bindable(false),

Category('Behavior'),

DefaultValue(''),Description('用户自定义的回传函数,为空则使用标准的回传函数')]

public String UserPostBackFunction

...{

get

...{ if (ViewState['UserPostBackFunction'] == null)

return '';

else

return ViewState['UserPostBackFunction'].ToString() ;

}

set

...{

ViewState['UserPostBackFunction'] = value;

}

}

protected virtual void OnEventChanged(EventTextBoxEventArgs e)

...{

EventChangedHandler handler1 = (EventChangedHandler) base.Events[objEventChangedKey];

if (handler1 != null)

...{

handler1(this, e);

}

}

public void RemoveStateView(String strKey)

...{

this.ViewState.Remove(strKey);

}

[Description('EventTextBox_OnEventChanged'), Category('Action')]

public event EventChangedHandler EventChanged

...{

add

...{

base.Events.AddHandler(objEventChangedKey, value);

}

remove

...{

base.Events.RemoveHandler(objEventChangedKey, value);

}

}

/**//// <summary>

/// 将此控件呈现给指定的输出参数。

/// </summary>

/// <param name='output'> 要写出到的 HTML 编写器 </param>

protected override void Render(HtmlTextWriter output)

...{

EventChangedHandler handler1 = (EventChangedHandler) base.Events[objEventChangedKey];

if (handler1 != null && EventName != String.Empty)

...{

base.Attributes[EventName]=UserPostBackFunction==''? Page.GetPostBackClientEvent(this,EventArgText):UserPostBackFunction;

if(PrefixText != '' && !base.Text.StartsWith(PrefixText)) base.Text = PrefixText + base.Text;

}

base.Render(output);

}

//增加自己想渲染的属性

protected override void AddAttributesToRender(HtmlTextWriter writer)

...{

//writer.AddAttribute(HtmlTextWriterAttribute.Title,'PEOControl');

base.AddAttributesToRender (writer);

}

IPostBackEventHandler 成员#region IPostBackEventHandler 成员

public void RaisePostBackEvent(string eventArgument)

...{

// TODO: 添加RaisePostBackEvent 实现

EventTextBoxEventArgs e = new EventTextBoxEventArgs(eventArgument);

OnEventChanged(e);

}

#endregion

}

}

 
 
 
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