在C#中,默认情况下是无法给Label设置BackgroundImage属性的,只有Image这个属性,但是在某些特殊的情况下我们又需要设置Label的BackgroundImage属性,因此我们必须对label控件加以改造。Label是继承自Control类的,而Control类是有BackgroundImage这个属性的,Label也有这个属性,只是在VS中我们无法看到而已,微软做了下处理,不希望我们在属性窗口中能够直接设置它。实际上它有很多属性在属性面板中没有显示而已,如下图示:
因此我们可以对Label控件代码稍加改写即可,代码如下图所示,我们写个控件继承Label,重写它的2个方法即可。
using System;
using System.Collections.Generic; using System.ComponentModel; using System.Diagnostics; using System.Linq; using System.Text; using System.Windows.Forms; using System.Drawing; namespace Tempus.Component { public partial class LabelEx2 : Label { public LabelEx2() { } protected override void OnPaintBackground(PaintEventArgs e) { return; } protected override void OnPaint(PaintEventArgs e) { //判断BackGroundImage是否为空 if (this.BackgroundImage != null) { e.Graphics.DrawImage(this.BackgroundImage, new System.Drawing.Rectangle(0, 0, this.Width, this.Height), this.Location.X, this.Location.Y, this.Width, this.Height, System.Drawing.GraphicsUnit.Pixel); } e.Graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; SolidBrush drawBrush = new SolidBrush(this.ForeColor); e.Graphics.DrawString(this.Text, this.Font, drawBrush, new System.Drawing.Rectangle(0, 0, this.Width, this.Height)); //base.OnPaint(e); } } } 调用时设置这个Label控件的BackgroundImage属性即可,Demo代码如下:string strWineDetail1 = Application.StartupPath + "\\Resources\\" + "WineDetail1.jpg";
lblWineInfo.BackgroundImage = Image.FromFile(strWineDetail1);