C#.圖片拖動處理(摘抄)

本文轉載自查看原文 2012-04-17 22:41 3208 WinForn

本文摘自博客園牛人吉日嘎啦。

通用權限管理系統組件源碼里，有職員管理的功能，實現了直接可以把照片拖拽過來的功能，用起來會很方便。

想要控件支持拖拽，需要設置 AllowDrop 屬性。

還需要寫下面的2個事件。

參考代碼如下，有需要的可以參考一下，把有需要的代碼參考一下就可以了。

// -----------------------------------------------------------
// All Rights Reserved , Copyright (C) 2010 ,Jirisoft , Ltd .
// -----------------------------------------------------------

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Text;
using System.Windows.Forms;
using System.IO;

namespace DotNet.WinForm.File
{
     using DotNet.Model;
     using DotNet.Utilities;
     using DotNet.Service;

     /// <summary>
     /// UCPicture
     /// 照片顯示控件
     ///
     /// 修改紀錄
     ///
     ///         2010.12.08 版本：2.0 JiRiGaLa 更新員工更新照片的錯誤。
     ///         2008.04.29 版本：1.0 JiRiGaLa 創建。
     ///
     /// 版本：2.0
     ///
     /// <author>
     ///          <name> JiRiGaLa </name>
     ///          <date> 2010.12.08 </date>
     /// </author>
     /// </summary>
     public partial class UCPicture : UserControl
    {
         public UCPicture()
        {
            InitializeComponent();
        }

         private BaseUserInfo userInfo = new BaseUserInfo();
         /// <summary>
         /// 當前操作員信息
         /// </summary>
         public BaseUserInfo UserInfo
        {
             get
            {
                userInfo = new BaseUserInfo();
                userInfo.GetUserInfo();
                 return userInfo;
            }
             set
            {
                userInfo = value;
            }
        }

         /// <summary>
         /// 保存到數據庫
         /// </summary>
         public bool FromDatabase = true;

         private string fileId = string.Empty;
         public string FileId
        {
             get
            {
                 return this.fileId;
            }
             set
            {
                 this.fileId = value;
                 this.ShowPicture();
            }
        }

         private string folderId = string.Empty;
         public string FolderID
        {
             get
            {
                 return this.folderId;
            }
             set
            {
                 this.folderId = value;
            }
        }

         private void UCPicture_Load( object sender, EventArgs e)
        {
             // 設置按鈕狀態
             // this.SetControlState();
        }

         private void UCPicture_DragOver( object sender, DragEventArgs e)
        {
             if (e.Data.GetDataPresent(DataFormats.FileDrop))
            {
                e.Effect = DragDropEffects.Move;
            }
        }

         private void UCPicture_DragDrop( object sender, DragEventArgs e)
        {
             if (e.Data.GetDataPresent(DataFormats.FileDrop))
            {
                 string[] file = ( string[])e.Data.GetData(DataFormats.FileDrop);
                 for ( int i = 0; i <= file.Length - 1; i++)
                {
                     if (System.IO.File.Exists(file[i]))
                    {
                         this.fileId = string.Empty;
                         // 設置顯示的圖片
                         this.pic.ImageLocation = file[i];
                         // 設置按鈕狀態
                         this.SetControlState();
                         break;
                    }
                }
            }
        }

         /// <summary>
         /// 顯示圖片
         /// </summary>
         public void ShowPicture()
        {
             if (!String.IsNullOrEmpty( this.FileId))
            {
                 // 顯示圖片
                 this.ShowPicture( this.FileId);
            }
             else
            {
                 // 清除圖片
                 this.ClearPicture();
            }
        }

         /// <summary>
         /// 顯示圖片
         /// </summary>
         /// <param name="id"> 主鍵 </param>
         private void ShowPicture( string id)
        {
             if (! this.FromDatabase)
            {
                 this.pic.ImageLocation = BaseSystemInfo.StartupPath + id;
            }
             else
            {
                 byte[] fileContent = null;
                fileContent = this.Download(id);
                 if (fileContent != null)
                {
                     // this.pic.Image = this.ByteToImage(fileContent);
                    MemoryStream memoryStream = new MemoryStream(fileContent);
                    Bitmap bitmap = new Bitmap(memoryStream);
                     this.pic.Image = bitmap;
                }
                 else
                {
                     this.FileId = string.Empty;
                     this.ClearPicture();
                }
            }
             // 設置按鈕狀態
             this.SetControlState();
        }

         /// <summary>
         /// 從數據庫中讀取文件
         /// </summary>
         /// <param name="id"> 文件主鍵 </param>
         /// <returns> 文件 </returns>
         public byte[] Download( string id)
        {
             return ServiceManager.Instance.FileService.Download(UserInfo, id);
             // OleDbHelper dbHelper = new SqlHelper();
             // dbHelper.Open();
             // byte[] fileContent = null;
             // string sqlQuery = " SELECT " + BaseFileTable.FieldFileContent
             //                 + "   FROM " + BaseFileTable.TableName
             //                 + "  WHERE " + BaseFileTable.FieldId + " = '" + Id + "'";
             // OleDbDataReader dataReader = (OleDbDataReader)dbHelper.ExecuteReader(sqlQuery);
             // if (dataReader.Read())
             // {
             //     fileContent = (byte[])dataReader[BaseFileTable.FieldFileContent];
             // }
             // dbHelper.Close();
             // return fileContent;
        }

         public string Upload( string folderId, string categoryId)
        {
             this.FolderID = folderId;
             string returnValue = string.Empty;
             if (!String.IsNullOrEmpty( this.pic.ImageLocation))
            {
                 // 保存到數據庫
                 if ( this.FromDatabase)
                {
                     if (String.IsNullOrEmpty( this.FileId))
                    {
                        returnValue = ServiceManager.Instance.FileService.Upload(UserInfo, folderId, Path.GetFileName( this.pic.ImageLocation), FileUtil.GetFile( this.pic.ImageLocation), true);
                    }
                     else
                    {
                         string statusCode = string.Empty;
                         string statusMessage = string.Empty;
                        ServiceManager.Instance.FileService.UpdateFile(UserInfo, this.FileId, Path.GetFileName( this.pic.ImageLocation), FileUtil.GetFile( this.pic.ImageLocation), out statusCode, out statusMessage);
                        returnValue = this.FileId;
                    }
                }
                 else
                {
                     // 復制文件到指定的目錄里
                     if (! this.pic.ImageLocation.Equals(BaseSystemInfo.StartupPath + this.FileId))
                    {
                         string destDirectory = BaseSystemInfo.StartupPath + " \\UploadFiles " + " \\ " + folderId + " \\ " + categoryId;
                        System.IO.Directory.CreateDirectory(destDirectory);
                         string destFileName = destDirectory + " \\ " + Path.GetFileName( this.pic.ImageLocation);
                        System.IO.File.Copy( this.pic.ImageLocation, destFileName);
                        returnValue = " \\UploadFiles " + " \\ " + folderId + " \\ " + categoryId + " \\ " + Path.GetFileName( this.pic.ImageLocation);
                    }
                }
                 // OleDbHelper dbHelper = new SqlHelper();
                 // dbHelper.Open();
                 // string sequence = BaseSequenceManager.Instance.GetSequence(DbHelper, BaseFileTable.TableName);
                 // OleDbSQLBuilder sqlBuilder = new OleDbSQLBuilder();
                 // sqlBuilder.BeginInsert(DbHelper, BaseFileTable.TableName);
                 // sqlBuilder.SetValue(BaseFileTable.FieldId, sequence);
                 // sqlBuilder.SetValue(BaseFileTable.FieldFolderId, folderId);
                 // sqlBuilder.SetValue(BaseFileTable.FieldFileName, Path.GetFileName(this.pic.ImageLocation));
                 // // byte[] File = this.ImageToByte(this.pic.Image);
                 // byte[] File = this.GetFile(this.pic.ImageLocation);
                 // sqlBuilder.SetValue(BaseFileTable.FieldFileContent, File);
                 // sqlBuilder.SetValue(BaseFileTable.FieldFileSize, File.Length);
                 // sqlBuilder.SetValue(BaseFileTable.FieldCreateUserId, UserInfo.Id);
                 // sqlBuilder.SetDBNow(BaseFileTable.FieldCreateDate);
                 // sqlBuilder.EndInsert();
                 // dbHelper.Close();
                 // returnValue = sequence;
            }
             return returnValue;
        }

         private void SetControlState( bool enabled)
        {
             this.btnSelect.Enabled  = enabled;
             this.btnClear.Enabled   = enabled;
             this.btnDelete.Enabled  = enabled;
        }

         #region private void SetControlState() 設置按鈕狀態
         /// <summary>
         /// 設置按鈕狀態
         /// </summary>
         private void SetControlState()
        {
             this.btnSelect.Enabled = true;
             // 是從數據庫里面讀取出來的
             if (!String.IsNullOrEmpty( this.FileId) && (String.IsNullOrEmpty( this.pic.ImageLocation) || ! this.FromDatabase))
            {
                 this.btnDelete.Enabled = true;
            }
             else
            {
                 this.btnDelete.Enabled = false;
            }
             // 清除按鈕
             this.btnClear.Enabled = false;
             if (!String.IsNullOrEmpty( this.pic.ImageLocation))
            {
                 if ( this.FromDatabase)
                {
                     this.btnClear.Enabled = true;
                     this.btnDelete.Enabled = false;
                }
                 else
                {
                     if (! this.pic.ImageLocation.Equals(BaseSystemInfo.StartupPath + this.FileId))
                    {
                         this.btnClear.Enabled = true;
                         this.btnDelete.Enabled = false;
                    }
                }
            }
        }
         #endregion

         private void pic_DoubleClick( object sender, EventArgs e)
        {
             if ( this.pic.Image != null)
            {
                FrmPicture frmPicture = new FrmPicture( this.FileId);
                frmPicture.SetImage( this.pic.Image);
                frmPicture.Show();
            }
        }

         private void btnSelect_Click( object sender, EventArgs e)
        {
            OpenFileDialog openFileDialog = new OpenFileDialog();
             // OpenFileDialog.InitialDirectory = Application.StartupPath;
            openFileDialog.Filter = " 位圖文件(*.bmp)|*.bmp|JPEG(*.JPG;*.JPEG;*.JPE;*.JFIF)|*.JPG;*.JPEG;*.JPE;*.JFIF|GIF(*.GIF)|*.GIF|TIFF(*.TIF;*.TIIF)|*.TIF;*.TIIF|PNG(*.PNG)|*.PNG|ICO(*.ICO)|*.ICO|所有圖片文件|(*.bmp;*.JPG;*.JPEG;*.JPE;*.JFIF;*.GIF;*.TIF;*.TIIF;*.PNG;*.ICO)|所有文件|*.* ";
            openFileDialog.FilterIndex = 7;
            openFileDialog.RestoreDirectory = true;
            openFileDialog.Title = " 打開圖片文件 ";
             if (openFileDialog.ShowDialog() == DialogResult.OK)
            {
                 this.fileId = string.Empty;
                 this.SetControlState( false);
                 this.pic.ImageLocation = openFileDialog.FileName;
                 // 設置按鈕狀態
                 this.SetControlState();
            }
        }

         /// <summary>
         /// 清除圖片
         /// </summary>
         private void ClearPicture()
        {
             this.pic.ImageLocation = string.Empty;
             this.pic.Image = null;
        }

         private void btnClear_Click( object sender, EventArgs e)
        {
             this.ClearPicture();
             this.ShowPicture();
             // 設置按鈕狀態
             this.SetControlState();
        }

         /// <summary>
         /// 刪除文件
         /// </summary>
         /// <param name="id"> 主鍵 </param>
         /// <returns> 影響的行數 </returns>
         public int DeleteFile( string id)
        {
             int returnValue = 0;
             if ( this.FromDatabase)
            {
                 // 從數據庫服務器刪除文件
                returnValue = ServiceManager.Instance.FileService.Delete(UserInfo, id);
            }
             else
            {
                 // 清除圖片
                 this.ClearPicture();
                 // 刪除文件
                System.IO.File.Delete(BaseSystemInfo.StartupPath + this.FileId);
            }
             return returnValue;
        }

         private void btnDelete_Click( object sender, EventArgs e)
        {
             if (MessageBox.Show(AppMessage.MSG0207, AppMessage.MSG0000, MessageBoxButtons.OKCancel, MessageBoxIcon.Question, MessageBoxDefaultButton.Button2) == DialogResult.OK)
            {
                 this.SetControlState( false);
                 this.DeleteFile( this.FileId);
                 this.FileId = string.Empty;
                 this.ShowPicture();
                 // 設置按鈕狀態
                 this.SetControlState();
            }
        }
    }
}

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