使用C#批量生成缩略图的工具源代码

减小字体

增大字体作者：孤星浪子来源：博客网发布时间：2010-03-03 18:02:00

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Threading;
using System.IO;
using System.Diagnostics;
using System.Windows.Forms.Design;
namespace Image
{
    public class ImageConvert
    {
        public static void ShowThumbnail( string oldfile,
        string newfile,
        int h,
        int w )
        {
            System.Drawing.Image img = System.Drawing.Image.FromFile( oldfile );
            System.Drawing.Image.GetThumbnailImageAbort myCallback = new System.Drawing.Image.GetThumbnailImageAbort( ThumbnailCallback );

            int oldh = img.Height;

            int oldw = img.Width;

            int newh,neww;
            double h1 = oldh*1.0/h;
            double w1 = oldw*1.0/w;
            double f = ( h1>w1 )? h1:w1;
            if( f < 1.0 )
            {
                newh = oldh;
                neww = oldw;
            }
            else
            {
                newh = ( int )( oldh/f );
                neww = ( int )( oldw/f );
            }
            System.Drawing.Image myThumbnail = img.GetThumbnailImage( neww, newh, myCallback, IntPtr.Zero );
            myThumbnail.Save( newfile, System.Drawing.Imaging.ImageFormat.Jpeg );
            img.Dispose( );
            myThumbnail.Dispose( );
        }

        private static bool ThumbnailCallback( )
        {
            return false;
        }
    }

    public class FolderDialog : FolderNameEditor
    {
        FolderNameEditor.FolderBrowser fDialog = new System.Windows.Forms.Design.FolderNameEditor.FolderBrowser( );

        public FolderDialog( )
        {
        }

        public DialogResult DisplayDialog( )
        {
            return DisplayDialog( "请选择一个文件夹" );
        }

        public DialogResult DisplayDialog( string description )
        {
            fDialog.Description = description;
            return fDialog.ShowDialog( );
        }

        public
        string Path
        {
            get
            {
                return fDialog.DirectoryPath;
            }
        }
        ~FolderDialog( )
        {
            fDialog.Dispose( );
        }
    }