source/Repid.Utility/Helper/ThumbnailHelper.cs

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using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.Linq;

namespace Repid.Utility.Helper
{
    /// <summary>
    /// 缩略图生成方式
    /// </summary>
    public enum TnType
    {
        /// <summary>
        /// 指定高宽缩放,可能变形
        /// </summary>
        HW,
        /// <summary>
        /// 指定宽度,高度按照比例缩放
        /// </summary>
        W,
        /// <summary>
        /// 指定高度,宽度按照等比例缩放
        /// </summary>
        H,
        /// <summary>
        /// 指定高宽裁剪,剧中裁剪
        /// </summary>
        Cut,
        /// <summary>
        /// 指定最大宽度,超出后按最大宽度缩放
        /// </summary>
        MW,
        /// <summary>
        /// 指定最大高度,超出后按最大高度缩放
        /// </summary>
        MH
    }

    /// <summary>
    /// 图片操作
    /// </summary>
    public static class ThumbnailHelper
    {
        /// <summary>
        /// 生成缩略图
        /// </summary>
        /// <param name="orginalImagePat">原图片地址</param>
        /// <param name="thumNailPath">缩略图地址</param>
        /// <param name="width">缩略图宽度</param>
        /// <param name="height">缩略图高度</param>
        /// <param name="model">生成缩略的模式</param>
        public static void Generate(string originalImagePath, string thumNailPath, int width, int height, TnType model, int quality = 97)
        {
            Image originalImage = Image.FromFile(originalImagePath);

            int thumWidth = width;      //缩略图的宽度
            int thumHeight = height;    //缩略图的高度