Winform 启动时的渐入渐出效果

 两个form：
    frmLogo，logo窗口，启动时渐入渐出。
    MainForm，程序的主窗口。

 

//frmLogo.Designer.cs 部分代码namespace FormTransparentEffectAtStart_up{ //省略部分不重要的代码 /// <summary> /// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// </summary> private void InitializeComponent() { this.components = new System.ComponentModel.Container(); this.label1 = new System.Windows.Forms.Label(); this.timer1 = new System.Windows.Forms.Timer(this.components); this.SuspendLayout(); // // label1 // this.label1.AutoSize = true; this.label1.BackColor = System.Drawing.Color.Silver; this.label1.Font = new System.Drawing.Font("华文新魏", 15F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134))); this.label1.ForeColor = System.Drawing.Color.Black; this.label1.Location = new System.Drawing.Point(70, 47); this.label1.Name = "label1"; this.label1.Size = new System.Drawing.Size(297, 21); this.label1.TabIndex = 0; this.label1.Text = "FormTransparentEffectAtStart-up"; // // timer1 // this.timer1.Tick += new System.EventHandler(this.timer1_Tick); // // FrmLogo // this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F); this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font; this.BackColor = System.Drawing.Color.FromArgb(((int)(((byte)(0)))), ((int)(((byte)(0)))), ((int)(((byte)(192))))); this.ClientSize = new System.Drawing.Size(438, 114); this.Controls.Add(this.label1); this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None; this.MaximizeBox = false; this.MinimizeBox = false; this.Name = "FrmLogo"; this.Opacity = 0; this.ShowIcon = false; this.ShowInTaskbar = false; this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen; this.Text = "FrmLogo"; this.ResumeLayout(false); this.PerformLayout(); } #endregion private System.Windows.Forms.Label label1; private System.Windows.Forms.Timer timer1; }}

 

//frmLogo.cs 代码namespace FormTransparentEffectAtStart_up{ public partial class FrmLogo : Form { public FrmLogo() { InitializeComponent(); this.Opacity = 0;//透明度 设置为0 this.timer1.Enabled = true; this.timer1.Interval = 150;//触发时间为150ms } bool bSubtractAlpha = true;//减少透明度 bool bAddAlpha = false;//增加透明度 private void timer1_Tick(object sender, EventArgs e) { //逐渐减少透明度 if (bSubtractAlpha) { if (this.Opacity < 1) { this.Opacity += 0.1; } else { bSubtractAlpha = false; bAddAlpha = true; } } //逐渐增加透明度 if (bAddAlpha) { if (this.Opacity > 0.1) { this.Opacity -= 0.1; } else { bAddAlpha = false; this.timer1.Enabled = false; } } //启动主窗口 if (this.timer1.Enabled == false) { new MainForm().Show(); } } }}

 

//MainForm.cs 代码namespace FormTransparentEffectAtStart_up{ public partial class MainForm : Form { public MainForm() { InitializeComponent(); } private void MainForm_FormClosed(object sender, FormClosedEventArgs e) { //关闭所有 Application.ExitThread(); } }}