上海移动云网站建设,成都哪些公司做网站好,超实用网站,重庆綦江网站建设项目升级.Net7.0以后#xff0c;System.Drawing.Common开关已经被删除#xff0c;且System.Drawing.Common仅在 Windows 上支持 #xff0c;于是想办法将原来上传图片验证文件名和获取图片扩展名方法替换一下#xff0c;便开始搜索相关解决方案。
.Net6.0文档#xff1a;…项目升级.Net7.0以后System.Drawing.Common开关已经被删除且System.Drawing.Common仅在 Windows 上支持 于是想办法将原来上传图片验证文件名和获取图片扩展名方法替换一下便开始搜索相关解决方案。
.Net6.0文档中断性变更仅在 Windows 上支持 System.Drawing.Common - .NET | Microsoft Learn
.Net7.0文档中断性变更删除了 System.Drawing.Common 配置开关 - .NET | Microsoft Learn
旧行为
在 .NET 6 之前使用 System.Drawing.Common 包不会产生任何编译时警告也不会引发任何运行时异常。
新行为
从 .NET 6 开始当为非 Windows 操作系统编译引用代码时平台分析器会发出编译时警告。 此外除非设置了配置选项否则将引发以下运行时异常
System.TypeInitializationException : The type initializer for Gdip threw an exception.---- System.PlatformNotSupportedException : System.Drawing.Common is not supported on non-Windows platforms. See https://aka.ms/systemdrawingnonwindows for more information.Stack Trace:at System.Drawing.SafeNativeMethods.Gdip.GdipCreateBitmapFromFile(String filename, IntPtr bitmap)/_/src/libraries/System.Drawing.Common/src/System/Drawing/Bitmap.cs(42,0): at System.Drawing.Bitmap..ctor(String filename, Boolean useIcm)/_/src/libraries/System.Drawing.Common/src/System/Drawing/Bitmap.cs(25,0): at System.Drawing.Bitmap..ctor(String filename)/_/src/libraries/System.Resources.ResourceManager/tests/ResourceManagerTests.cs(270,0): at System.Resources.Tests.ResourceManagerTests.EnglishImageResourceData()MoveNext()/_/src/libraries/System.Linq/src/System/Linq/Select.cs(136,0): at System.Linq.Enumerable.SelectEnumerableIterator2.MoveNext()----- Inner Stack Trace -----/_/src/libraries/System.Drawing.Common/src/System/Drawing/LibraryResolver.cs(31,0): at System.Drawing.LibraryResolver.EnsureRegistered()/_/src/libraries/System.Drawing.Common/src/System/Drawing/GdiplusNative.Unix.cs(65,0): at System.Drawing.SafeNativeMethods.Gdip.PlatformInitialize()/_/src/libraries/System.Drawing.Common/src/System/Drawing/Gdiplus.cs(27,0): at System.Drawing.SafeNativeMethods.Gdip..cctor()
可通过将 runtimeconfig.json 文件中的 System.Drawing.EnableUnixSupport运行时配置开关设置为 true 来启用对 .NET 6 中非 Windows 平台的支持。
runtimeconfig.template.json 模板文件
{ configProperties: { System.Drawing.EnableUnixSupport: true } }
[appname].runtimeconfig.json 输出文件
{ runtimeOptions: { configProperties: { System.Drawing.EnableUnixSupport: true } } }
上面描述.Net6.0之前还是可以使用System.Drawing.Common.Net6.0需要设置开关而.Net7.0中直接将开关删除由于项目中上传文件验证文件格式等操作于是便搜索相关替代方案。
在github中发现一个开源项目https://github.com/iron-software/IronSoftware.System.Drawing 将项目中代码替换为IronSoftware.System.Drawing类库本文使用的版本为 保存图片
/// summary
/// 字节数组转换成图片
/// hef 2023.03.10 13:53 将原System.Drawing替换为IronSoftware.Drawing
/// /summary
/// param namebuffer/param
/// param namesImgSavePath/param
/// returns/returns
static public string ByteToImg(byte[] buffer, string sImgSavePath)
{AnyBitmap img AnyBitmap.FromBytes(buffer);img.SaveAs(sImgSavePath);return sImgSavePath;
}
获取图片扩展名
/// summary
/// 获取图片后缀
/// hef 2023.03.10 13:54 将原System.Drawing替换为IronSoftware.Drawing
/// /summary
/// param nameimage/param
/// returns/returns
static public string GetImageExt(AnyBitmap image)
{string imageExt ;var RawFormat image.GetImageFormat();if (RawFormat AnyBitmap.ImageFormat.Png){imageExt .png;}if (RawFormat AnyBitmap.ImageFormat.Jpeg){imageExt .jpg;}if (RawFormat AnyBitmap.ImageFormat.Bmp){imageExt .bmp;}if (RawFormat AnyBitmap.ImageFormat.Gif){imageExt .gif;}if (RawFormat AnyBitmap.ImageFormat.Icon){imageExt .icon;}if (RawFormat AnyBitmap.ImageFormat.Wbmp){imageExt .bmp;}if (RawFormat AnyBitmap.ImageFormat.Webp){imageExt .png;}return imageExt;
}
你可以直接获取扩展名
string sExtName Enum.GetName(typeof(AnyBitmap.ImageFormat), AnyBitmap.ImageFormat.Gif);
使用上面一行代码得到的值为gif并不包含.[点]。
使用封装的方法如下列举两种常用方法你也可以使用其它方法
1.通过字节数组转换为AnyBitmap
var vAnyBitmap FileHelper.ByteToImg(bytes);2.通过Stream转换为AnyBitmap
var vAnyBitmap IronSoftware.Drawing.AnyBitmap.FromStream(fileStream);string sImgExt FileHelper.GetImageExt(vAnyBitmap); 其它示例
Bitmap to Stream
using IronSoftware.Drawing;
using System.IO;AnyBitmap bitmap AnyBitmap.FromFile(FILE_PATH);// Get stream of AnyBitmap
MemoryStream stream bitmap.GetStream();// Convert AnyBitmap to stream
MemoryStream stream1 bitmap.ToStream();
Bitmap to String
using IronSoftware.Drawing;AnyBitmap bitmap AnyBitmap.FromFile(FILE_PATH);// Convert AnyBitmap to a string that represents the object
string bitmapString bitmap.ToString();
Cast to AnyBitmap
using IronSoftware.Drawing;
using System.IO;// We create an AnyBitmap object. We will then cast other popular types to Anybitmap.
AnyBitmap anyBitmap;// Cast System.Drawing bitmap to AnyBitmap
System.Drawing.Bitmap bitmapFromBitmap new System.Drawing.Bitmap(FILE_PATH);
anyBitmap bitmapFromBitmap;// Cast System image to AnyBitmap
System.Drawing.Image bitmapFromFile System.Drawing.Image.FromFile(FILE_PATH);
anyBitmap bitmapFromFile;// Cast SKBitmap to AnyBitmap
SkiaSharp.SKBitmap skiaBitmap SkiaSharp.SKBitmap.Decode(FILE_PATH);
anyBitmap skiaBitmap;// Cast SKimage to AnyBitmap
SkiaSharp.SKImage skiaImage SkiaSharp.SKImage.FromBitmap(SkiaSharp.SKBitmap.Decode(FILE_PATH));
anyBitmap skiaImage;// Cast SixLabors Image to AnyBitmap
SixLabors.ImageSharp.ImageSixLabors.ImageSharp.PixelFormats.Rgba32 imgSharp SixLabors.ImageSharp.Image.LoadSixLabors.ImageSharp.PixelFormats.Rgba32(FILE_PATH);
anyBitmap imgSharp;// Cast Maui image to AnyBitmap (not for NET 4.7.2):
byte[] imageAsBytes File.ReadAllBytes(FILE_PATH);
// var mauiPlatformImage Microsoft.Maui.Graphics.Platform.PlatformImage.FromStream(new MemoryStream(imageAsBytes));
Clone AnyBitmap
using IronSoftware.Drawing;// Clone an AnyBitmap
AnyBitmap clonedframe AnyBitmap.FromFile(FILE_PATH).Clone();
clonedframe.SaveAs(frameClone.jpg);// Clone frames of any image with a specified crop area
AnyBitmap clonedWithCrop AnyBitmap.FromFile(FILE_PATH).Clone(new Rectangle(0, 0, 150, 150));
clonedWithCrop.SaveAs(cropCloned.jpg);
Create Multipage TIFF and GIF
using IronSoftware.Drawing;
using System.Collections.Generic;// Create a multipage Tiff with frames of different dimensions
ListAnyBitmap tiffBitmaps new ListAnyBitmap()
{AnyBitmap.FromFile(cropframe1.jpg),AnyBitmap.FromFile(frame2.jpg),AnyBitmap.FromFile(cropframe3.jpg)
};
AnyBitmap multiFrameTiff AnyBitmap.CreateMultiFrameTiff(tiffBitmaps);
multiFrameTiff.SaveAs(multiTiffwcrops.tiff);// Create a multipage Gif with frames of different dimensions
ListAnyBitmap gifBitmaps new ListAnyBitmap()
{AnyBitmap.FromFile(frame1.jpg),AnyBitmap.FromFile(frame2.jpg),AnyBitmap.FromFile(frame3.jpg),AnyBitmap.FromFile(cropframe4.jpg)
};
AnyBitmap multiFrameGif AnyBitmap.CreateMultiFrameGif(gifBitmaps);
multiFrameGif.SaveAs(multiGif.gif);
Export AnyBitmap
using IronSoftware.Drawing;//Export AnyBitmap files to other formats with ability to control loss
AnyBitmap bitmap new AnyBitmap(FILE_PATH);
bitmap.ExportFile(losslogo.png, AnyBitmap.ImageFormat.Png, 100);
Generate AnyBitmap
using IronSoftware.Drawing;
using System;
using System.IO;AnyBitmap bitmap;// Generate AnyBitmap using filepath
bitmap AnyBitmap.FromFile(FILE_PATH);
bitmap.SaveAs(output.bmp);// Generate AnyBitmap from bytes
byte[] bytes File.ReadAllBytes(FILE_PATH);
bitmap AnyBitmap.FromBytes(bytes);
bitmap.SaveAs(result.bmp);// Generate AnyBitmap from memory stream
byte[] bytes2 File.ReadAllBytes(FILE_PATH);
MemoryStream ms new MemoryStream(bytes2);
bitmap AnyBitmap.FromStream(ms);
bitmap.SaveAs(output.bmp);// Generate AnyBitmap from Uri
Uri uri new Uri(URI_PATH);
bitmap await AnyBitmap.FromUriAsync(uri);
bitmap.SaveAs(uriImage.bmp);// Generate AnyBitmap file from SVG file
bitmap AnyBitmap.FromFile(FILE_PATH.svg);
bitmap.SaveAs(result.jpg);
以上示例代码可能与本人使用的版本有不同可以更新至新版本希望本文对你有帮助。
