爲子代表

Question

VB lambda表達式有代碼：

Private Sub InsertItemInCache(Of T)(ByVal item As CachedItem(Of T), ByVal dependency As AggregateCacheDependency, _ 
ByVal key As String, ByVal updateCallBack As CacheItemUpdateCallback) 

CacheItemUpdateCallback的簽名是：

Sub CacheItemUpdateCallback(ByVal key As String, ByVal reason As CacheItemUpdateReason, _ 
    ByRef expensiveObject As Object, ByRef dependency As CacheDependency, ByRef absoluteExpiration As Date, _ 
    ByRef slidingExpiration As TimeSpan) 

我想用蘭巴表達這個調用InsertItemInCache功能。 此代碼不能編譯：

InsertItemInCache(cachedItem, dependency, key, Function(k, r, e, d, a, s) CacheItemUpdateCallback(k, r, e, d, a, s)) 

它說如果我改變表達不產生價值

子CacheItemUpdateCallback到功能CacheItemUpdateCallback 它也不會被編譯並嵌套說函數不具有與委託相同的簽名'Delegate Sub CacheItemUpdateCallback（key As String，reason As System.Web.Caching.CacheItemUpdateReason，ByRef expensiveObject As Object，ByRe f依賴作爲System.Web.Caching.CacheDependency，ByRef absoluteExpiration作爲日期，ByRef slidingExpiration作爲System.TimeSpan）'

任何人都可以幫助我通過lambda表達式調用此方法嗎？我想在將來使用關閉功能，並以這種方式調用此功能：

InsertItemInCache(cachedItem, dependency, key, Function(k, r, e, d, a, s) CacheItemUpdateCallbackNew(k, r, e, d, a, s, additionalParameter1, additionalParameter2, additionalParameter3)) 

Answer 1

這個怎麼樣？

InsertItemInCache(cachedItem, dependency, key, _ 
    Sub(k, r, e, d, a, s) CacheItemUpdateCallback(k, r, e, d, a, s)) 

我認爲這隻會在2010年VB.Net工作，據我記得更早版本不支持Sub lambda表達式。