C # Transparent Background panel, transparent image, piturebox transparency effect

1. Custom Transparent Background Panel control : Add Class TransparentPanel.cs in Project

Using system.windows.forms;using system.drawing;

public class Transparentpanel:control {public Transparentpanel () {} Pro  tected override void OnPaintBackground (PaintEventArgs e) {//Draw without background} protected override CreateParams CreateParams {get {createparams CP = base.                CreateParams; Cp.            ExStyle |= 0x00000020; //ws_ex_transparent return CP; }} protected override void OnPaint (System.Windows.Forms.PaintEventArgs e) {//Draw panel background map Like if (backgroundimage!= null) e.graphics.drawimage (this.        BackgroundImage, New Point (0, 0));        ////Add a custom property value for the control num1//private int num1 = 1; [Bindable (True), Category ("Custom property Bar"), DefaultValue (1), Description ("Here is the description of the custom attribute ATTR1!        ")]//public int Attr1//{//get {return NUM1;} set {this. Invalidate (); }        //}    }

2, F5 compile run once, you can find the control in the toolbarTransparentpanel.

After you add the control to the forms form, set its Image property to see the transparency in the *.png image with transparency information.

C # Transparent Background panel, transparent image, piturebox transparency effect