错误是这个:/Users/student/Projects/C#workspace/Event/Event/Program.cs(32,32): Error CS0070: The event `Event.Program.eMath' can only appear on the left hand side of += or -= when used outside of the type `Event.Program' (CS0070) (Event)
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C#事件显示这个错是什么原因
错误是这个:/Users/student/Projects/C#workspace/Event/Event/Program.cs(32,32): Error CS0070: The event `Event.Program.eMath' can only appear on the left hand side of += or -= when used outside of the type `Event.Program' (CS0070) (Event)