C#创建背景色渐变窗体的方法实例

publie static Color FromArgb(int red,int green,int blue)

namespace _184
{
    partial class Form1
    {
        /// <summary>
        ///  Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;
 
        /// <summary>
        ///  Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }
 
        #region Windows Form Designer generated code
 
        /// <summary>
        ///  Required method for Designer support - do not modify
        ///  the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            SuspendLayout();
            // 
            // Form1
            // 
            AutoScaleDimensions = new SizeF(7F, 17F);
            AutoScaleMode = AutoScaleMode.Font;
            ClientSize = new Size(368, 252);
            Name = "Form1";
            StartPosition = FormStartPosition.CenterScreen;
            Text = "窗体背景渐变色";
            ResumeLayout(false);
        }
 
        #endregion
    }
}

// 窗体渐变色
namespace _184
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
 
        /// <summary>
        /// 重写窗体背景色
        /// </summary>
        protected override void OnPaintBackground(PaintEventArgs e)
        {
            int intLocation, intHeight;
            intLocation = ClientRectangle.Location.Y;//为变量intLocation赋值
            intHeight = ClientRectangle.Height / 200;//为变量intHeight赋值
            for (int i = 255; i >= 0; i--)
            {
                Color color = Color.FromArgb(1, i, 100);
                SolidBrush SBrush = new(color);      //实例化一个单色画笔类对象SBrush
                Pen pen = new(SBrush, 1);            //实例化一个用于绘制直线和曲线的对象pen
                e.Graphics.DrawRectangle(pen, ClientRectangle.X, intLocation, Width, intLocation + intHeight);//绘制图形
                intLocation += intHeight;            //重新为变量intLocation赋值
            }
        }
    }
}