ASPX向ASCX传值以及文本创建图片(附源码)

程序员文章站 2024-03-02 19:32:40

网页aspx有一个textbox，另一个ascx有一个imagebutton，用户点一点这个铵钮，把用户在textbox输入的文字创建为一个图片，ascx的imagebut...

网页aspx有一个textbox，另一个ascx有一个imagebutton，用户点一点这个铵钮，把用户在textbox输入的文字创建为一个图片，ascx的imagebutton的imageurl重新指向这刚产生的图片。

为了传值，写一个接口，返回aspx的textbox函数：

复制代码代码如下:

 
using system; 
using system.collections.generic; 
using system.linq; 
using system.web; 
using system.web.ui.webcontrols; 
/// <summary> 
/// summary description for itransmitable 
/// </summary> 
namespace insus.net 
{ 
public interface itransmitable 
{ 
textbox gettextboxcontrol(); 
} 
} 

a.aspx.cs，并实现接口。

复制代码代码如下:

 
using system; 
using system.collections.generic; 
using system.linq; 
using system.web; 
using system.web.ui; 
using system.web.ui.htmlcontrols; 
using system.web.ui.webcontrols; 
using insus.net; 
public partial class a : system.web.ui.page,itransmitable 
{ 
protected void page_load(object sender, eventargs e) 
{ 
} 
public textbox gettextboxcontrol() 
{ 
return this.tbhid; 
} 
} 

a.aspx，把用户控件b.ascx接入页面。

复制代码代码如下:

 
<%@ page language="c#" autoeventwireup="true" codefile="a.aspx.cs" inherits="a" %> 
<%@ register src="b.ascx" tagname="b" tagprefix="uc1" %> 
<!doctype html> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head runat="server"> 
<title></title> 
</head> 
<body> 
<form id="form1" runat="server"> 
<div> 
<asp:textbox id="tbhid" runat="server" /> 
<uc1:b id="b1" runat="server" /> 
</div> 
</form> 
</body> 
</html> 

b.ascx:

复制代码代码如下:

 
<%@ control language="c#" autoeventwireup="true" codefile="b.ascx.cs" inherits="b" %> 
<asp:imagebutton runat="server" id="imgbmp" onclick="imgbmp_click" borderwidth="1" /> 

b.ascx.cs:

复制代码代码如下:

 
using system; 
using system.collections.generic; 
using system.drawing; 
using system.drawing.drawing2d; 
using system.drawing.imaging; 
using system.drawing.text; 
using system.io; 
using system.linq; 
using system.web; 
using system.web.ui; 
using system.web.ui.webcontrols; 
using insus.net; 
public partial class b : system.web.ui.usercontrol 
{ 
protected void page_load(object sender, eventargs e) 
{ 
this.imgbmp.imageurl = getimagepath("insus.net"); //默认值。 
} 
protected void imgbmp_click(object sender, imageclickeventargs e) 
{ 
itransmitable textbox = (itransmitable)this.page; //把page转换为接口。 
this.imgbmp.imageurl = getimagepath(textbox.gettextboxcontrol().text.trim()); 
} 
//创建图片 
private string getimagepath(string _text) 
{ 
bitmap bitmap = new bitmap(1, 1); 
font font = new font("arial", 25, fontstyle.regular, graphicsunit.pixel); 
graphics graphics = graphics.fromimage(bitmap); 
int width = (int)graphics.measurestring(_text, font).width; 
int height = (int)graphics.measurestring(_text, font).height; 
bitmap = new bitmap(bitmap, new size(width, height)); 
graphics = graphics.fromimage(bitmap); 
graphics.clear(color.white); 
graphics.smoothingmode = smoothingmode.antialias; 
graphics.textrenderinghint = textrenderinghint.antialias; 
graphics.drawstring(_text, font, new solidbrush(color.fromargb(0, 0, 0)), 0, 0); 
graphics.flush(); 
graphics.dispose(); 
string filename = path.getfilenamewithoutextension(path.getrandomfilename()) + ".jpg"; 
bitmap.save(server.mappath("~/imagelib/") + filename, imageformat.jpeg); 
return "~/imagelib/" + filename; 
} 
} 

运行效果：

demo code download(.net 4.5)

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