个人代码库のC#背景色渐变的功能

/// <summary> 

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/// 实现“背景色渐变”的功能。【尚不完善】 

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/// </summary> 

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/// <param name="e"></param> 

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protected override void OnPaintBackground(PaintEventArgs e) 

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{ 

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    int y, dy; 

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    //y=this.Height-this.ClientRectangle.Height; 

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    y = this.ClientRectangle.Location.Y; 

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    dy = this.ClientRectangle.Height / 256; 

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    for (int i = 255; i >= 0; i--) 

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    { 

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        Color c = new Color(); 

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        c = Color.FromArgb(Convert.ToInt32(textBox1.Text.ToString()), i,Convert.ToInt32(textBox2.Text.ToString())); 

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        SolidBrush sb = new SolidBrush(c); 

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        Pen p = new Pen(sb, 100); 

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        e.Graphics.DrawRectangle(p,this.ClientRectangle.X, y, this.Width,y+dy); 

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        y = y + dy; 

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    } 

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}