文本创建图片，ASPX向ASCX传值

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：

Itransmitable

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.asp.cs，并实现接口。

A.aspx.cs

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。

A.aspx

<%@ 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:

View Code

<%@ 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:

B.ascx.cs

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) :
http://download.cnblogs.com/insus/ASPDOTNET/aspx2ascx.rar