C# 索引器的形式参数成为相应的 UML 操作的参数，而索引器的类型成为 UML 操作的返回类型。
The formal parameters of the C# indexer become the parameters of the corresponding UML operation and the type of the indexer becomes the return type of the UML operation.
常常可以发现bug的原因是调用者发送了类型错误的参数或数量错误的参数，或者实际参数和形式参数的次序不匹配。
Often, you can trace the origin of a bug back to a caller that's sending the wrong type of argument, the wrong number of arguments, or a mismatch between the order of actual and formal arguments.
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