C# winform 自定义边框

C# winform 自定义边框

如图：

将winform窗体设置透明及this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;后窗体显示如图。

现在我们要在form上自定义绘制边框。 程序如下：

        private void formMain_Paint(object sender, PaintEventArgs e)
        {
            Rectangle myRectangle = new Rectangle(0, 0, this.Width, this.Height);
            //ControlPaint.DrawBorder(e.Graphics, myRectangle, Color.Blue, ButtonBorderStyle.Solid);//画个边框 
            ControlPaint.DrawBorder(e.Graphics, myRectangle,
                Color.Black, 3, ButtonBorderStyle.Solid,
                Color.Black, 3, ButtonBorderStyle.Solid,
                Color.Black, 3, ButtonBorderStyle.Solid,
                Color.Blue, 3, ButtonBorderStyle.Solid
            );
        }

private void InitializeComponent()
        {
            System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(Form1));
            this.label1 = new System.Windows.Forms.Label();
            this.SuspendLayout();
            // 
            // label1
            // 
            this.label1.AutoSize = true;
            this.label1.Location = new System.Drawing.Point(38, 26);
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size(107, 12);
            this.label1.TabIndex = 0;
            this.label1.Text = "这个窗体是透明的!";
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.BackColor = System.Drawing.Color.Red;
            this.BackgroundImage = ((System.Drawing.Image)(resources.GetObject("$this.BackgroundImage")));
            this.ClientSize = new System.Drawing.Size(284, 261);
            this.Controls.Add(this.label1);
            this.ForeColor = System.Drawing.Color.FromArgb(((int)(((byte)(240)))), ((int)(((byte)(200)))), ((int)(((byte)(105)))));
            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
            this.Name = "Form1";
            this.Text = "Form1";
            this.TransparencyKey = System.Drawing.Color.Red;
            this.Load += new System.EventHandler(this.Form1_Load);
            this.Paint += new System.Windows.Forms.PaintEventHandler(this.formMain_Paint);
            this.ResumeLayout(false);
            this.PerformLayout();

        }

效果如下：