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CentOS7 安装 Mono 官网参考：http://www.mono-project.com/docs/getting-started/install/linux/#centos-7-fedora-19-and-later-and-derivatives
先配置：
yum install yum-utils
rpm --import "http://keyserver.Ubuntu.com/pks/lookup?op=get&search=0x3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF"
yum-config-manager --add-repo http://download.mono-project.com/repo/centos/配置完后怎么安装呢？上面的地址给了一句话：
Run a package upgrade to upgrade existing packages to the latest available. Then install Mono as described in the Usage section.
查看 Usage 是这样的：
The package mono-devel should be installed to compile code.
The package mono-complete should be installed to install everything – this should cover most cases of“assembly not found”errors.
The package referenceassemblies-pcl should be installed for PCL compilation support – this will resolve most cases of“Framework not installed: .NETPortable”errors during software compilation.
The package ca-certificates-mono should be installed to get SSL certificates for HTTPS connections. Install this package if you run into trouble making HTTPS connections.
The module mono-xsp4 should be installed for running ASP.NET applications.
那么问题来了，到底怎么安装？？？其实上面的意思就是这样：
yum upgrade
yum install mono-complete在长时间的安装之后，通过这个地址的文档来验证安装状态：
http://www.mono-project.com/docs/getting-started/mono-basics/
更多 CentOS 相关信息见 CentOS 专题页面 http://www.linuxidc.com/topicnews.aspx?tid=14
本文永久更新链接地址 ：http://www.linuxidc.com/Linux/2017-05/143789.htm
