Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index

Question

请教一下,这是什么问题?
Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index 
[ArgumentOutOfRangeException: Index was out of range.  Must be non-negative and less than the size of the collection.
Parameter name: index]
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