C#完成為一張年夜尺寸圖片創立縮略圖的辦法。本站提示廣大學習愛好者:(C#完成為一張年夜尺寸圖片創立縮略圖的辦法)文章只能為提供參考,不一定能成為您想要的結果。以下是C#完成為一張年夜尺寸圖片創立縮略圖的辦法正文
本文實例講述了C#完成為一張年夜尺寸圖片創立縮略圖的辦法。分享給年夜家供年夜家參考。詳細完成辦法以下:
public static Bitmap CreateThumbnail(string lcFilename, int lnWidth, int lnHeight) { System.Drawing.Bitmap bmpOut = null; try { Bitmap loBMP = new Bitmap(lcFilename); ImageFormat loFormat = loBMP.RawFormat; decimal lnRatio; int lnNewWidth = 0; int lnNewHeight = 0; //*** If the image is smaller than a thumbnail just return it if (loBMP.Width < lnWidth && loBMP.Height < lnHeight) return loBMP; if (loBMP.Width > loBMP.Height) { lnRatio = (decimal)lnWidth / loBMP.Width; lnNewWidth = lnWidth; decimal lnTemp = loBMP.Height * lnRatio; lnNewHeight = (int)lnTemp; } else { lnRatio = (decimal)lnHeight / loBMP.Height; lnNewHeight = lnHeight; decimal lnTemp = loBMP.Width * lnRatio; lnNewWidth = (int)lnTemp; } bmpOut = new Bitmap(lnNewWidth, lnNewHeight); Graphics g = Graphics.FromImage(bmpOut); g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic; g.FillRectangle(Brushes.White, 0, 0, lnNewWidth, lnNewHeight); g.DrawImage(loBMP, 0, 0, lnNewWidth, lnNewHeight); loBMP.Dispose(); } catch { return null; } return bmpOut; }
願望本文所述對年夜家的C#法式設計有所贊助。