環境：
Centos7
.Net core 2.0
問題：
使用QRCoder 報“Unable to load DLL 'gdiplus'"
同 https://q.cnblogs.com/q/98966/
解決：
yum install libgdiplus-devel
注意：
yum install libgdiplus 后，在centos7 下，程序並不能運行成功還是報錯，查看libgdiplus安裝情況
rpm -qa |grep libgdiplus
rpm -ql libgdiplus-2.10-9.el7.x86_64
在/usr/lib64下缺少libgdiplus.so文件
Centos7 需要通過安裝libgdiplus-devel來解決
參考文章：
https://q.cnblogs.com/q/98966/
https://github.com/CoreCompat/System.Drawing/issues/8
If I recall correctly, the .so file for libgdiplus is named libgdiplus.so.0 on CentOS (see https://centos.pkgs.org/7/epel-x86_64/libgdiplus-2.10-9.el7.x86_64.rpm.html). CoreCompat.System.Drawing is looking for libgdiplus.so so that doesn't work. On CentOS, you need to install the libgdiplus-devel package.