向窗体中拖放图片并显示

 

 

Frm_Main.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;//添加的命名空间，对文件进行操作
using System.Threading;//线程序的命名空间

namespace DragImageToForm
{
    public partial class Frm_Main : Form
    {
        public Frm_Main()
        {
            InitializeComponent();
        }

        public static bool Var_Style = true;
        public static string tempstr="";

        /// <summary>
/// 在窗体背景中显示被拖放的图片
/// </summary>
/// <param Frm="Form">窗体</param>
/// <param e="DragEventArgs">DragDrop、DragEnter 或 DragOver 事件提供数据</param>
        public void SetDragImageToFrm(Form Frm, DragEventArgs e)
        {
            if (Var_Style == true)
            {
                e.Effect = DragDropEffects.Copy;//设置拖放操作中目标放置类型为复制
                String[] str_Drop = (String[])e.Data.GetData(DataFormats.FileDrop, true);//检索数据格式相关联的数据
                string tempstr;
                Bitmap bkImage;//定义Bitmap变量
                tempstr = str_Drop[0];//获取拖放文件的目录
                try
                {
                    bkImage = new Bitmap(tempstr);//存储拖放的图片
//根据图片设置窗体的大小
                    Frm.Size = new System.Drawing.Size(bkImage.Width + 6, bkImage.Height + 33);
                    Frm.BackgroundImage = bkImage;//在窗体背景中显示图片
                }
                catch { }
            }
        }

        private void Frm_Main_DragEnter(object sender, DragEventArgs e)
        {
            SetDragImageToFrm(this, e);//在窗体中显示拖放到窗体上的图片
        }
    }
}

Frm_Main.designer.cs

namespace DragImageToForm
{
    partial class Frm_Main
    {
        /// <summary>
/// 必需的设计器变量。
/// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
/// 清理所有正在使用的资源。
/// </summary>
/// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows 窗体设计器生成的代码

        /// <summary>
/// 设计器支持所需的方法 - 不要
/// 使用代码编辑器修改此方法的内容。
/// </summary>
        private void InitializeComponent()
        {
            this.components = new System.ComponentModel.Container();
            this.panel_face = new System.Windows.Forms.Panel();
            this.contextMenuStrip1 = new System.Windows.Forms.ContextMenuStrip(this.components);
            this.Tool_Ima = new System.Windows.Forms.ToolStripMenuItem();
            this.Tool_File = new System.Windows.Forms.ToolStripMenuItem();
            this.contextMenuStrip1.SuspendLayout();
            this.SuspendLayout();
            // 
// panel_face
// 
            this.panel_face.ContextMenuStrip = this.contextMenuStrip1;
            this.panel_face.Dock = System.Windows.Forms.DockStyle.Fill;
            this.panel_face.Location = new System.Drawing.Point(0, 0);
            this.panel_face.Name = "panel_face";
            this.panel_face.Size = new System.Drawing.Size(391, 238);
            this.panel_face.TabIndex = 0;
            this.panel_face.Visible = false;
            // 
// contextMenuStrip1
// 
            this.contextMenuStrip1.Items.AddRange(new System.Windows.Forms.ToolStripItem[] {
            this.Tool_Ima,
            this.Tool_File});
            this.contextMenuStrip1.Name = "contextMenuStrip2";
            this.contextMenuStrip1.Size = new System.Drawing.Size(137, 48);
            // 
// Tool_Ima
// 
            this.Tool_Ima.Name = "Tool_Ima";
            this.Tool_Ima.Size = new System.Drawing.Size(136, 22);
            this.Tool_Ima.Tag = "1";
            this.Tool_Ima.Text = "拖放图片";
            // 
// Tool_File
// 
            this.Tool_File.Name = "Tool_File";
            this.Tool_File.Size = new System.Drawing.Size(136, 22);
            this.Tool_File.Tag = "2";
            this.Tool_File.Text = "拖放文件夹";
            // 
// Frm_Main
// 
            this.AccessibleRole = System.Windows.Forms.AccessibleRole.None;
            this.AllowDrop = true;
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(391, 238);
            this.ContextMenuStrip = this.contextMenuStrip1;
            this.Controls.Add(this.panel_face);
            this.Name = "Frm_Main";
            this.Text = "向窗体中拖放图片并显示";
            this.DragEnter += new System.Windows.Forms.DragEventHandler(this.Frm_Main_DragEnter);
            this.contextMenuStrip1.ResumeLayout(false);
            this.ResumeLayout(false);

        }

        #endregion

        private System.Windows.Forms.Panel panel_face;
        private System.Windows.Forms.ContextMenuStrip contextMenuStrip1;
        private System.Windows.Forms.ToolStripMenuItem Tool_Ima;
        private System.Windows.Forms.ToolStripMenuItem Tool_File;

    }
}

作者：墨明棋妙
出处：http://www.cnblogs.com/ynbt/
关于作者：专注于.Net、WCF和移动互联网开发。
本文版权归作者和博客园共有，欢迎转载，但未经作者同意必须保留此段声明，且在文章页面明显位置给出原文连接，如有问题，可以通过ynbt_wang@163.com联系我，非常感谢。 。