explicit reference conversions中文什么意思

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A failure occurs during an explicit reference conversion
顯式引用轉(zhuǎn)換期間發(fā)生失敗。
That indicates that an explicit reference conversion failed
，該異常指示顯式引用轉(zhuǎn)換失敗。
Exception is thrown when a failure occurs during an explicit reference conversion
當(dāng)在顯式引用轉(zhuǎn)換期間發(fā)生失敗時(shí)，會引發(fā)
For an explicit reference conversion to be successful , the source value must be null
為了使顯式引用轉(zhuǎn)換成功，源值必須為null （在visual basic中為
For an explicit reference conversion to be successful , the source value must be a null reference nothing in visual basic , or the object type referenced by the source argument must be convertible to the destination type by an implicit reference conversion
為使顯式引用轉(zhuǎn)換成功進(jìn)行，源值必須為空引用（在visual basic中為nothing ），或者源參數(shù)引用的對象類型必須可以通過隱式引用轉(zhuǎn)換來轉(zhuǎn)換為目標(biāo)類型。

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