How ASPX passes values and text to ASCX to create pictures
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The web page ASPX has a TextBox, and another ASCX has an ImageButton. The user clicks this button to create an image of the text entered by the user in TextBox, and the ImageUrl of ASCX's ImageButton points back to the newly generated image.
To pass a value, write an interface and return the TextBox function of aspx:
The copy code is as follows:
Using System
Using System.Collections.Generic
Using System.Linq
Using System.Web
Using System.Web.UI.WebControls
/ / /
/ Summary description for Itransmitable
/ / /
Namespace Insus.NET
{
Public interface Itransmitable
{
TextBox GetTextBoxControl ()
}
}
A.aspx.cs and implement the interface.
The copy code is as follows:
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, connect the user control B.ascx to the page.
The copy code is as follows:
B.ascx:
The copy code is as follows:
B.ascx.cs:
The copy code is as follows:
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"); / / default.
}
Protected void imgBmp_Click (object sender, ImageClickEventArgs e)
{
Itransmitable textbox = (Itransmitable) this.Page; / / converts page to an interface.
This.imgBmp.ImageUrl = GetImagePath (textbox.GetTextBoxControl () .Text.Trim ())
}
/ / create a picture
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
}
}
Running effect:
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