asp.net core 杂记

1、输出时设置编码，读取配置

context.Response.ContentType = "text/html;charset=utf-8";  //"application/json;charset=utf-8","image/jpeg"
await context.Response.WriteAsync(Configuration["Title"]);

 

dotnet add package System.Text.Encoding.CodePages --version 4.5.1

System.Text.Encoding.RegisterProvider(System.Text.CodePagesEncodingProvider.Instance);
Encoding encoding = Encoding.GetEncoding("gb2312");

using (var reader = new StreamReader(stream, encoding))

 

2、指定端口不指定IP，用机器ip (.net core 2.1)

.UseUrls("http://*:5000")

     http://localhost:5000和http://ip:5000访问 (.net 6 及以后版本) 

     在appsettings.json加入 "urls":"http://192.168.120.23:5000;http://localhost:5000",

     

 

3、ASP.Net Core 在 CentOS 下使用 System.Drawing 绘图类报错

Unhandled Exception: System.TypeInitializationException: The type initializer for 'Gdip' threw an exception. ---> System.DllNotFoundException: Unable to load shared library 'libdl' or one of its dependencies. In order to help diagnose loading problems, consider setting the LD_DEBUG environment variable: liblibdl: cannot open shared object file: No such file or directory
   at Interop.Libdl.dlopen(String fileName, Int32 flag)
   at System.Drawing.SafeNativeMethods.Gdip.LoadNativeLibrary()
   at System.Drawing.SafeNativeMethods.Gdip..cctor()
   --- End of inner exception stack trace ---
   at System.Drawing.SafeNativeMethods.Gdip.GdipLoadImageFromDelegate_linux(StreamGetHeaderDelegate getHeader, StreamGetBytesDelegate getBytes, StreamPutBytesDelegate putBytes, StreamSeekDelegate doSeek, StreamCloseDelegate close, StreamSizeDelegate size, IntPtr& image)
   at System.Drawing.Image.InitFromStream(Stream stream)
   at System.Drawing.Image.LoadFromStream(Stream stream, Boolean keepAlive)

解决办法：

# locate libdl
/usr/lib64/libdl-2.17.so
/usr/lib64/libdl.so.2
# cd /usr/lib64
# ln -s libdl-2.17.so libdl.so

 然后又报另外一个错误：Unable to load DLL 'libgdiplus'

# yum install libgdiplus-devel

 这样就解决了

4、nginx强制使用https访问(http跳转到https)

server {  
    listen  80;  
    server_name *.test.com;  
    rewrite ^(.*)$  https://$host$1 permanent;  
}