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(huì)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(duì)象類(lèi)型必須可以通過(guò)隱式引用轉(zhuǎn)換來(lái)轉(zhuǎn)換為目標(biāo)類(lèi)型。