使用ActiveX控件实现批量文件上传

接上面两篇，我把这个ActiveX控件实际地完善了一下，实现了一个简单的批量上传的功能。大致效果看起来如下

点击浏览按钮，会弹出一个对话框，让我们选择一个文件夹

选择某个文件夹之后，点击“确定”，此时会把该目录下面的图片文件读取出来一个列表。如下面所示

那么大致是怎么实现的呢？

首先，让我们的那个类型继承　System.Windows.Forms.UserControl类型

其次，在这个UserControl上面设计一些子控件

我们在拖拽控件的时候，设计器会帮助生成一个方法：InitializeComponent，类似下面这样

        private void InitializeComponent()
        {
            this.components = new System.ComponentModel.Container();
            this.listView1 = new System.Windows.Forms.ListView();
            this.imageList1 = new System.Windows.Forms.ImageList(this.components);
            this.btBrowser = new System.Windows.Forms.Button();
            this.btUpload = new System.Windows.Forms.Button();
            this.SuspendLayout();
            // 
            // listView1
            // 
            this.listView1.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
                        | System.Windows.Forms.AnchorStyles.Left)
                        | System.Windows.Forms.AnchorStyles.Right)));
            this.listView1.LargeImageList = this.imageList1;
            this.listView1.Location = new System.Drawing.Point(8, 5);
            this.listView1.Name = "listView1";
            this.listView1.Size = new System.Drawing.Size(790, 195);
            this.listView1.TabIndex = 0;
            this.listView1.UseCompatibleStateImageBehavior = false;
            // 
            // imageList1
            // 
            this.imageList1.ColorDepth = System.Windows.Forms.ColorDepth.Depth8Bit;
            this.imageList1.ImageSize = new System.Drawing.Size(64, 64);
            this.imageList1.TransparentColor = System.Drawing.Color.Transparent;
            // 
            // btBrowser
            // 
            this.btBrowser.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Left)));
            this.btBrowser.Location = new System.Drawing.Point(5, 206);
            this.btBrowser.Name = "btBrowser";
            this.btBrowser.Size = new System.Drawing.Size(76, 23);
            this.btBrowser.TabIndex = 1;
            this.btBrowser.Text = "浏览...";
            this.btBrowser.UseVisualStyleBackColor = true;
            this.btBrowser.Click += new System.EventHandler(this.btBrowser_Click);
            // 
            // btUpload
            // 
            this.btUpload.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Left)));
            this.btUpload.Location = new System.Drawing.Point(86, 206);
            this.btUpload.Name = "btUpload";
            this.btUpload.Size = new System.Drawing.Size(75, 23);
            this.btUpload.TabIndex = 2;
            this.btUpload.Text = "上传...";
            this.btUpload.UseVisualStyleBackColor = true;
            // 
            // MyActiveXControl
            // 
            this.BackColor = System.Drawing.Color.White;
            this.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
            this.Controls.Add(this.btUpload);
            this.Controls.Add(this.btBrowser);
            this.Controls.Add(this.listView1);
            this.Name = "MyActiveXControl";
            this.Padding = new System.Windows.Forms.Padding(5);
            this.Size = new System.Drawing.Size(806, 237);
            this.ResumeLayout(false);

        }

接下来编写代码，与windows Forms里面编程没有任何区别。为按钮绑定事件处理程序等等

这里要注意的是，需要手工地添加一个构造函数，在构造函数中调用InitializeComponent

        public MyActiveXControl() {
            InitializeComponent();
        }

至于选择文件夹的代码，大致如下

        private void btBrowser_Click(object sender, EventArgs e)
        {
            FolderBrowserDialog dialog = new FolderBrowserDialog();
            dialog.SelectedPath = Environment.GetFolderPath(Environment.SpecialFolder.MyPictures);
            if (dialog.ShowDialog() == DialogResult.OK)
            {
                listView1.Items.Clear();


                DirectoryInfo dir = new DirectoryInfo(dialog.SelectedPath);

                foreach (FileInfo file in dir.GetFiles("*.jpg"))
                {
                    ListViewItem item = new ListViewItem(file.Name);
                    imageList1.Images.Add(Image.FromFile(file.FullName));
                    item.ImageIndex = imageList1.Images.Count - 1;
                    listView1.Items.Add(item);
                }
            }

        }