c# 转换Image为Icon

时间:2022-03-22 08:43:46

/// <summary> /// 转换Image为Icon /// </summary> /// <param>要转换为图标的Image对象</param> /// <param>当image为null时是否返回null。false则抛空引用异常</param> /// <exception cref="ArgumentNullException" /> public static Icon ConvertToIcon(Image image, bool nullTonull = false) { if (image == null) { if (nullTonull) { return null; } throw new ArgumentNullException("image"); } using (MemoryStream msImg = new MemoryStream() , msIco = new MemoryStream()) { image.Save(msImg, ImageFormat.Png); using (var bin = new BinaryWriter(msIco)) { //写图标头部 bin.Write((short)0); //0-1保留 bin.Write((short)1); //2-3文件类型。1=图标, 2=光标 bin.Write((short)1); //4-5图像数量(图标可以包含多个图像) bin.Write((byte)image.Width); //6图标宽度 bin.Write((byte)image.Height); //7图标高度 bin.Write((byte)0); //8颜色数(若像素位深>=8,填0。这是显然的,达到8bpp的颜色数最少是256,byte不够表示) bin.Write((byte)0); //9保留。必须为0 bin.Write((short)0); //10-11调色板 bin.Write((short)32); //12-13位深 bin.Write((int)msImg.Length); //14-17位图数据大小 bin.Write(22); //18-21位图数据起始字节 //写图像数据 bin.Write(msImg.ToArray()); bin.Flush(); bin.Seek(0, SeekOrigin.Begin); return new Icon(msIco); } } }