仿Office的程序载入窗体

　　初次接触启动界面记不清是在哪一年了，估计是小学四年级第一次打开Office Word的时候吧，更记不清楚当时的启动界面是长啥样了。后来随着使用的软件越来越多，也见到各式各样的启动界面。下面就列举了两个平常本人平常最常见的窗体，其实windows系统在启动的过程中，有Window字样并且有动画效果的那个节面也算是一个启动界面。

　　其目的很明显，就是程序启动之后，由于加载主界面的时间过长而导致用户体验不佳，于是往往在显示主界面之前多显示一个不带windows窗体元素的窗体，来显示应用程序加载的进度或者直接是一个静态的视图，作用在于就是跟用户反映程序是有响应的并且正在运行当中，从而提高用户体验。下面是我的载入窗

主要是仿照了Office 2013的风格

　　简约明了。其中窗体的底色，字体，文字颜色可以更改，左上角的制造商，中间的软件名称，左下角的进度信息都可以更改。不过暂时还没有把图标附加到左上角而已。

窗体的设计如下所示

　　载入窗的制造商，软件名称这些信息通过构造函数传参进行设置，此外默认的构造函数被屏蔽了

         private LoadingForm()
         {
             InitializeComponent();
         }

         public LoadingForm(string logoStr, string appNameStr, string iniMsgStr):this()
         {
             this.lbLogo.Text = logoStr;
             AppName = appNameStr;
             this.lbMsg.Text = iniMsgStr;
             this.picLoading.Width = this.Width;

             this.MouseDown+=new MouseEventHandler(LoadingForm_MouseDown);
             foreach (Control con in this.Controls)
             {
                 if (con.Equals(this.btnClose)) continue;
                 con.MouseDown += new MouseEventHandler(LoadingForm_MouseDown);
             }
         }

　　对窗体的打开并非用单纯的Show或者ShowDialog，因为在主线程上Show的话，本身主线程要加载时就会阻塞，这样再阻塞的线程上show的话，窗体难以显示。如果用ShowDialog的也不行，虽然它可以让窗体显示出来，但是调用了ShowDialog之后直到窗体关闭了才返回。就是说载入窗关闭了之后才执行载入加载之类的操作，这样显得毫无意义。

　　这里只是用来了一个异步去ShowDialog。代码如下

         public void ShowLoading()
         {
             Action callback = new Action(delegate()
             {
                 if (!this.IsDisposed)
                     this.ShowDialog();
             });
             callback.BeginInvoke(null, null);
         }

　　这里在ShowDialog之前还多作了一个判断，在于关闭窗体的方法时释放了资源，因此在几个地方都要注意，关闭窗体的处理如下

         public void CloseLoading()
         {
             if (!this.IsDisposed && this.IsHandleCreated)
             {
                 this.Invoke((Action)delegate
                 {
                     this.Close();
                     this.Dispose();

                 });
             }
         }

　　由于调用了Invoke，这个需要判断当前窗体是否已经是显示了出来，否则就会因为窗体的句柄不存在而抛出异常。

　　在窗体上显示的进度信息，只是通过了一个外放的属性实现，其判断的用意跟关闭窗体时的一样。

         public string Message {
             get { return this.lbMsg.Text; }
             set
             {
                 if (!this.IsDisposed&&this.IsHandleCreated)
                 {
                     this.Invoke((Action)delegate()
                     {
                         this.lbMsg.Text = value;
                     });
                 }
             }
         }

为了窗体能具备可拖拽的效果，还额外加了一下的代码

         [DllImport("user32.dll")]
         private  static extern bool ReleaseCapture();
         [DllImport("user32.dll")]
         private static extern bool SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);
         private const int WM_SYSCOMMAND = 0x0112;
         private const int SC_MOVE = 0xF010;
         private const int HTCAPTION = 0x0002;

         protected void LoadingForm_MouseDown(object sender, MouseEventArgs e)
         {

             ReleaseCapture();
             SendMessage(this.Handle, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, );
         }

调用的形式如下

            LoadingForm frm = new LoadingForm("HopeGi", "猴健工具集", "启动中...");
            frm.ShowLoading();
            //一系列操作
            frm.Message = "加载界面...";
            //一系列操作
            frm.CloseLoading();

　　最近出了点状况，电脑很久也没碰了，前进的步伐缓了下来。能写出来的博客也不咋的，各位有什么好的建议和意见尽管提，谢谢！最后附上源码,可是用到的gif图片没附带上来

     public partial class LoadingForm : Form
     {

         [DllImport("user32.dll")]
         private  static extern bool ReleaseCapture();
         [DllImport("user32.dll")]
         private static extern bool SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);
         private const int WM_SYSCOMMAND = 0x0112;
         private const int SC_MOVE = 0xF010;
         private const int HTCAPTION = 0x0002;

         private LoadingForm()
         {
             InitializeComponent();
         }

         public LoadingForm(string logoStr, string appNameStr, string iniMsgStr):this()
         {
             this.lbLogo.Text = logoStr;
             AppName = appNameStr;
             this.lbMsg.Text = iniMsgStr;
             this.picLoading.Width = this.Width;

             this.MouseDown+=new MouseEventHandler(LoadingForm_MouseDown);
             foreach (Control con in this.Controls)
             {
                 if (con.Equals(this.btnClose)) continue;
                 con.MouseDown += new MouseEventHandler(LoadingForm_MouseDown);
             }
         }

         public string Message {
             get { return this.lbMsg.Text; }
             set
             {
                 if (!this.IsDisposed&&this.IsHandleCreated)
                 {
                     this.Invoke((Action)delegate()
                     {
                         this.lbMsg.Text = value;
                     });
                 }
             }
         }

         public void ShowLoading()
         {
             Action callback = new Action(delegate()
             {
                 if (!this.IsDisposed)
                     this.ShowDialog();
             });
             callback.BeginInvoke(null, null);
         }

         public void CloseLoading()
         {
             if (!this.IsDisposed && this.IsHandleCreated)
             {
                 this.Invoke((Action)delegate
                 {
                     this.Close();
                     this.Dispose();

                 });
             }
         }

         private string AppName {
             get { return this.lbAppName.Text; }
             set {
                 this.lbAppName.Text = value;
                 this.lbAppName.Location = new Point((this.Width - this.lbAppName.Width) / , this.lbAppName.Location.Y);
             }
         }

         private void btnClose_Click(object sender, EventArgs e)
         {
             this.CloseLoading();
             Environment.Exit();
         }

         protected void LoadingForm_MouseDown(object sender, MouseEventArgs e)
         {

             ReleaseCapture();
             SendMessage(this.Handle, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, );
         }

         #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()
         {
             this.lbLogo = new System.Windows.Forms.Label();
             this.lbAppName = new System.Windows.Forms.Label();
             this.lbMsg = new System.Windows.Forms.Label();
             this.btnClose = new System.Windows.Forms.PictureBox();
             this.picLoading = new System.Windows.Forms.PictureBox();
             ((System.ComponentModel.ISupportInitialize)(this.btnClose)).BeginInit();
             ((System.ComponentModel.ISupportInitialize)(this.picLoading)).BeginInit();
             this.SuspendLayout();
             //
             // lbLogo
             //
             this.lbLogo.AutoSize = true;
             this.lbLogo.Font = new System.Drawing.Font("楷体", 12F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)()));
             this.lbLogo.ForeColor = System.Drawing.Color.White;
             this.lbLogo.Location = new System.Drawing.Point(, );
             this.lbLogo.Name = "lbLogo";
             this.lbLogo.Size = new System.Drawing.Size(, );
             this.lbLogo.TabIndex = ;
             this.lbLogo.Text = "LOGO";
             //
             // lbAppName
             //
             this.lbAppName.AutoSize = true;
             this.lbAppName.Font = new System.Drawing.Font("黑体", 26.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)()));
             this.lbAppName.ForeColor = System.Drawing.Color.White;
             this.lbAppName.Location = new System.Drawing.Point(, );
             this.lbAppName.Name = "lbAppName";
             this.lbAppName.Size = new System.Drawing.Size(, );
             this.lbAppName.TabIndex = ;
             this.lbAppName.Text = "AppName\r\n";
             //
             // lbMsg
             //
             this.lbMsg.AutoSize = true;
             this.lbMsg.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)()));
             this.lbMsg.ForeColor = System.Drawing.Color.White;
             this.lbMsg.Location = new System.Drawing.Point(, );
             this.lbMsg.Name = "lbMsg";
             this.lbMsg.Size = new System.Drawing.Size(, );
             this.lbMsg.TabIndex = ;
             this.lbMsg.Text = "label1";
             //
             // btnClose
             //
             this.btnClose.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
             this.btnClose.Cursor = System.Windows.Forms.Cursors.Hand;
             this.btnClose.Image = global::AllTypeTest.Properties.Resources.Delete;
             this.btnClose.Location = new System.Drawing.Point(, );
             this.btnClose.Name = "btnClose";
             this.btnClose.Size = new System.Drawing.Size(, );
             this.btnClose.SizeMode = System.Windows.Forms.PictureBoxSizeMode.Zoom;
             this.btnClose.TabIndex = ;
             this.btnClose.TabStop = false;
             this.btnClose.Click += new System.EventHandler(this.btnClose_Click);
             //
             // picLoading
             //
             this.picLoading.Image = global::AllTypeTest.Properties.Resources.download;
             this.picLoading.Location = new System.Drawing.Point(, );
             this.picLoading.Name = "picLoading";
             this.picLoading.Size = new System.Drawing.Size(, );
             this.picLoading.SizeMode = System.Windows.Forms.PictureBoxSizeMode.Zoom;
             this.picLoading.TabIndex = ;
             this.picLoading.TabStop = false;
             //
             // LoadingForm
             //
             this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
             this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
             this.BackColor = System.Drawing.Color.ForestGreen;
             this.ClientSize = new System.Drawing.Size(, );
             this.Controls.Add(this.btnClose);
             this.Controls.Add(this.lbMsg);
             this.Controls.Add(this.picLoading);
             this.Controls.Add(this.lbAppName);
             this.Controls.Add(this.lbLogo);
             this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
             this.Name = "LoadingForm";
             this.ShowInTaskbar = false;
             this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
             this.Text = "LoadingForm";
             this.TopMost = true;
             ((System.ComponentModel.ISupportInitialize)(this.btnClose)).EndInit();
             ((System.ComponentModel.ISupportInitialize)(this.picLoading)).EndInit();
             this.ResumeLayout(false);
             this.PerformLayout();

         }

         #endregion

         private System.Windows.Forms.Label lbLogo;
         private System.Windows.Forms.Label lbAppName;
         private System.Windows.Forms.PictureBox picLoading;
         private System.Windows.Forms.Label lbMsg;
         private System.Windows.Forms.PictureBox btnClose;

     }

LoadingForm