该文件常见出现的位置

版本	位置
3.5.30729.5420builtby:Win7SP1	\ProgramFiles\ReferenceAssemblies\Microsoft\Framework\v3.5
3.5.30729.5420builtby:Win7SP1	\ProgramFiles(x86)\ReferenceAssemblies\Microsoft\Framework\v3.5
3.5.30729.4926builtby:NetFXw7	\ProgramFiles\ReferenceAssemblies\Microsoft\Framework\v3.5
4.0.30319.233builtby:RTMGDR	\Windows\Microsoft.NET\Framework\v4.0.30319
4.0.30319.1builtby:RTMRel	\Windows\Microsoft.NET\Framework\v4.0.30319
3.5.30729.1builtby:SP	\ProgramFiles\ReferenceAssemblies\Microsoft\Framework\v3.5
4.0.50401.0(SL_V4_RTW.050401-0	\ProgramFiles\MicrosoftSilverlight\4.0.50401.0
3.0.40723.0(SL_V3_RTW.040723-0	\ProgramFiles(x86)\WindowsLive\Mesh
5.0.10411.00builtby:SL_V5_SVC	\ProgramFiles\MicrosoftSilverlight\5.1.10411.0
4.1.10329.0(SL_V4_SVC.010329-0	\ProgramFiles\MicrosoftSilverlight\4.1.10329.0
3.0.40723.0(SL_V3_RTW.040723-0	\ProgramFiles\WindowsLive\Mesh
4.0.60129.0(SL_V4_SVC.060129-0	\ProgramFiles\MicrosoftSilverlight\4.0.60129.0
4.0.60531.0(SL_V4_SVC.060531-0	\ProgramFiles\MicrosoftSilverlight\4.0.60531.0
4.0.60531.0(SL_V4_SVC.060531-0	\ProgramFiles\MicrosoftSilverlight\4.0.60531.0
4.1.10329.0(SL_V4_SVC.010329-0	\ProgramFiles(x86)\MicrosoftSilverlight\4.1.10329.0

一、如果您的系统提示“没有找到System.Core.dll”或者“缺少System.Core.dll”等类似错误信息，请把System.Core.dll下载到本机
二、直接拷贝该文件到系统目录里：
　 1、Windows NT/2000系统，则复制到C:\WINNT\System32目录下。
2、Windows XP/Vista/Win7/8系统，则复制到C:\Windows\System32目录下。
三、然后打开“开始-运行-输入regsvr32 System.Core.dll”，回车即可解决错误提示！