1 using System; 2 using System.Collections.Generic; 3 using System.ComponentModel; 4 using System.Data; 5 using System.Drawing; 6 using System.Linq; 7 using System.Text; 8 using System.Windows.Forms; 9 using System.IO;//添加的命名空间，对文件进行操作10 using System.Threading;//线程序的命名空间11 12 namespace DragImageToForm13 {14     public partial class Frm_Main : Form15     {16         public Frm_Main()17         {18             InitializeComponent();19         }20 21         public static bool Var_Style = true;22         public static string tempstr="";23 24         /// <summary>25 /// 在窗体背景中显示被拖放的图片26 /// </summary>27 /// <param Frm="Form">窗体</param>28 /// <param e="DragEventArgs">DragDrop、DragEnter 或 DragOver 事件提供数据</param>29         public void SetDragImageToFrm(Form Frm, DragEventArgs e)30         {31             if (Var_Style == true)32             {33                 e.Effect = DragDropEffects.Copy;//设置拖放操作中目标放置类型为复制34                 String[] str_Drop = (String[])e.Data.GetData(DataFormats.FileDrop, true);//检索数据格式相关联的数据35                 string tempstr;36                 Bitmap bkImage;//定义Bitmap变量37                 tempstr = str_Drop[0];//获取拖放文件的目录38                 try39                 {40                     bkImage = new Bitmap(tempstr);//存储拖放的图片41 //根据图片设置窗体的大小42                     Frm.Size = new System.Drawing.Size(bkImage.Width + 6, bkImage.Height + 33);43                     Frm.BackgroundImage = bkImage;//在窗体背景中显示图片44                 }45                 catch { }46             }47         }48 49         private void Frm_Main_DragEnter(object sender, DragEventArgs e)50         {51             SetDragImageToFrm(this, e);//在窗体中显示拖放到窗体上的图片52         }53     }54 }

 1 namespace DragImageToForm 2 { 3     partial class Frm_Main 4     { 5         /// <summary> 6 /// 必需的设计器变量。 7 /// </summary> 8         private System.ComponentModel.IContainer components = null; 9 10         /// <summary>11 /// 清理所有正在使用的资源。12 /// </summary>13 /// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>14         protected override void Dispose(bool disposing)15         {16             if (disposing && (components != null))17             {18                 components.Dispose();19             }20             base.Dispose(disposing);21         }22 23         #region Windows 窗体设计器生成的代码24 25         /// <summary>26 /// 设计器支持所需的方法 - 不要27 /// 使用代码编辑器修改此方法的内容。28 /// </summary>29         private void InitializeComponent()30         {31             this.components = new System.ComponentModel.Container();32             this.panel_face = new System.Windows.Forms.Panel();33             this.contextMenuStrip1 = new System.Windows.Forms.ContextMenuStrip(this.components);34             this.Tool_Ima = new System.Windows.Forms.ToolStripMenuItem();35             this.Tool_File = new System.Windows.Forms.ToolStripMenuItem();36             this.contextMenuStrip1.SuspendLayout();37             this.SuspendLayout();38             // 39 // panel_face40 // 41             this.panel_face.ContextMenuStrip = this.contextMenuStrip1;42             this.panel_face.Dock = System.Windows.Forms.DockStyle.Fill;43             this.panel_face.Location = new System.Drawing.Point(0, 0);44             this.panel_face.Name = "panel_face";45             this.panel_face.Size = new System.Drawing.Size(391, 238);46             this.panel_face.TabIndex = 0;47             this.panel_face.Visible = false;48             // 49 // contextMenuStrip150 // 51             this.contextMenuStrip1.Items.AddRange(new System.Windows.Forms.ToolStripItem[] {52             this.Tool_Ima,53             this.Tool_File});54             this.contextMenuStrip1.Name = "contextMenuStrip2";55             this.contextMenuStrip1.Size = new System.Drawing.Size(137, 48);56             // 57 // Tool_Ima58 // 59             this.Tool_Ima.Name = "Tool_Ima";60             this.Tool_Ima.Size = new System.Drawing.Size(136, 22);61             this.Tool_Ima.Tag = "1";62             this.Tool_Ima.Text = "拖放图片";63             // 64 // Tool_File65 // 66             this.Tool_File.Name = "Tool_File";67             this.Tool_File.Size = new System.Drawing.Size(136, 22);68             this.Tool_File.Tag = "2";69             this.Tool_File.Text = "拖放文件夹";70             // 71 // Frm_Main72 // 73             this.AccessibleRole = System.Windows.Forms.AccessibleRole.None;74             this.AllowDrop = true;75             this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);76             this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;77             this.ClientSize = new System.Drawing.Size(391, 238);78             this.ContextMenuStrip = this.contextMenuStrip1;79             this.Controls.Add(this.panel_face);80             this.Name = "Frm_Main";81             this.Text = "向窗体中拖放图片并显示";82             this.DragEnter += new System.Windows.Forms.DragEventHandler(this.Frm_Main_DragEnter);83             this.contextMenuStrip1.ResumeLayout(false);84             this.ResumeLayout(false);85 86         }87 88         #endregion89 90         private System.Windows.Forms.Panel panel_face;91         private System.Windows.Forms.ContextMenuStrip contextMenuStrip1;92         private System.Windows.Forms.ToolStripMenuItem Tool_Ima;93         private System.Windows.Forms.ToolStripMenuItem Tool_File;94 95     }96 }