using System;

using System.Collections.Generic;

using System.Security.Cryptography;

using System.Text;

using Microsoft.AspNetCore.Mvc.ModelBinding;

using System.DrawingCore;

using System.DrawingCore.Drawing2D;

using System.IO;

using System.Reflection;

using System.ComponentModel;

namespace Blog.Common

{

/// <summary>

/// 工具类

/// </summary>

public static class Utils

{

/// <summary>

/// 获取枚举值的描述文本

/// </summary>

/// <param name="value"></param>

/// <returns></returns>

public static string GetEnumDesc(Enum en)

{

Type type = en.GetType();

MemberInfo[] memInfo = type.GetMember(en.ToString()); if (memInfo != null && memInfo.Length > 0)

{

object[] attrs = memInfo[0].GetCustomAttributes(typeof(System.ComponentModel.DataAnnotations.DisplayAttribute), false); if (attrs != null && attrs.Length > 0) return ((System.ComponentModel.DataAnnotations.DisplayAttribute)attrs[0]).Name;

}

return en.ToString();

}

/// <summary>

/// 使用MD5加密字符串

/// </summary>

/// <param name="str">待加密的字符</param>

/// <returns></returns>

public static string MD5(this string str)

{

if (string.IsNullOrEmpty(str))

{

return string.Empty;

}

MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();

byte[] arr = UTF8Encoding.Default.GetBytes(str);

byte[] bytes = md5.ComputeHash(arr);

str = BitConverter.ToString(bytes);

return str;

}

/// <summary>

/// 获取ModelState的错误信息

/// </summary>

/// <param name="ModelState"></param>

/// <returns></returns>

public static string ModelStateMessage(ModelStateDictionary modelState)

{

StringBuilder errinfo = new StringBuilder();

foreach (var m in modelState.Values)

{

foreach (var e in m.Errors)

{

errinfo.AppendLine(e.ErrorMessage);

}

}

return errinfo.ToString();

}

/// <summary>

/// 首字母大写

/// </summary>

/// <param name="str"></param>

/// <returns></returns>

public static string FirstLetterToUp(this string str)

{

return str.Substring(0, 1).ToUpper() + str.Substring(1);

}

/// <summary>

/// 创建缩略图

/// </summary>

/// <param name="originalPicture">原图地址</param>

/// <param name="thumbnail">缩略图地址</param>

/// <param name="width">宽</param>

/// <param name="height">高</param>

/// <returns>是否成功</returns>

public static bool CreateThumbnail(string originalPicture, string thumbnail, int width, int height)

{

//原图

Image _original = Image.FromFile(originalPicture);

// 原图使用区域

RectangleF _originalArea = new RectangleF();

//宽高比

float _ratio = (float)width / height;

if (_ratio > ((float)_original.Width / _original.Height))

{

_originalArea.X = 0;

_originalArea.Width = _original.Width;

_originalArea.Height = _originalArea.Width / _ratio;

_originalArea.Y = (_original.Height - _originalArea.Height) / 2;

}

else

{

_originalArea.Y = 0;

_originalArea.Height = _original.Height;

_originalArea.Width = _originalArea.Height * _ratio;

_originalArea.X = (_original.Width - _originalArea.Width) / 2;

}

Bitmap _bitmap = new Bitmap(width, height);

Graphics _graphics = Graphics.FromImage(_bitmap);

//设置图片质量

_graphics.InterpolationMode = InterpolationMode.High;

_graphics.SmoothingMode = SmoothingMode.HighQuality;

//绘制图片

_graphics.Clear(Color.Transparent);

_graphics.DrawImage(_original, new RectangleF(0, 0, _bitmap.Width, _bitmap.Height), _originalArea, GraphicsUnit.Pixel);

//保存

_bitmap.Save(thumbnail);

_graphics.Dispose();

_original.Dispose();

_bitmap.Dispose();

return true;

}

/// <summary>

/// 等比例压缩图片

/// </summary>

public static void SaveImageByWidthHeight(int intImgCompressWidth, int intImgCompressHeight, Stream stream, string strFileSavePath)

{

//从输入流中获取上传的image对象

using (Image img = Image.FromStream(stream))

{

//根据压缩比例求出图片的宽度

int intWidth = intImgCompressWidth / intImgCompressHeight * img.Height;

int intHeight = img.Width * intImgCompressHeight / intImgCompressWidth;

//画布

using (Bitmap bitmap = new Bitmap(img, new Size(intImgCompressWidth, intImgCompressHeight)))

{

//在画布上创建画笔对象

using (Graphics graphics = Graphics.FromImage(bitmap))

{

//将图片使用压缩后的宽高,从0，0位置画在画布上

graphics.DrawImage(img, 0, 0, intImgCompressWidth, intImgCompressHeight);

//保存图片

bitmap.Save(strFileSavePath);

}

}

}

}

/// <summary>

/// 按照比例缩小图片

/// </summary>

/// <param name="srcImage">要缩小的图片</param>

/// <param name="percent">缩小比例</param>

/// <returns>缩小后的结果</returns>

public static void PercentImage(Stream stream, double percent, string strFileSavePath)

{

Image img = Image.FromStream(stream);

// 缩小后的高度

int newH = int.Parse(Math.Round(img.Height * percent).ToString());

// 缩小后的宽度

int newW = int.Parse(Math.Round(img.Width * percent).ToString());

try

{

// 要保存到的图片

Bitmap b = new Bitmap(newW, newH);

Graphics g = Graphics.FromImage(b);

// 插值算法的质量

g.InterpolationMode = InterpolationMode.Default;

g.DrawImage(img, new Rectangle(0, 0, newW, newH), new Rectangle(0, 0, img.Width, img.Height), GraphicsUnit.Pixel);

g.Dispose();

b.Save(strFileSavePath);

}

catch (Exception)

{

}

}

}

}