An indexer is a name-value pair, you declare a class of name-value pairs, you can assign values to the specified elements of the array, or you can access the subscript for the specified element value (the individual thinks it's possible to write a similar list yourself, and there's no need to superfluous an extra method)
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Complex indexer can be seen as a simple database, such as a person corresponding to the ID, the results of the various subjects, but this is not as good as the read and write database, so it is not practical
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C#. NET Frequently asked Questions (FAQ)-What is the use of indexer indexer