VB.NET中为何基础LINQ查询执行失败？
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本文共计205个文字，预计阅读时间需要1分钟。
我遗失了一些非常基本的常识，我不知道是什么……我对Linq有一个例外：Dim arch As List(Of String) 'gets archive as String() and casts it as List arch=client.GetArchive().ToList() 'here exception occurs: Cannot cast an object of type 'String' to type 'List(Of String)'.
Dim arch As List(Of String) 'gets archive as String() and casts it as List arch = client.GetArchive().ToList() 'here exception occurs: Cannot cast object of type 'WhereSelectListIterator`2'... arch = From a In arch Where a.EndsWith(System.Environment.UserName & ".htm") Select a 正如它所述,你正试图将迭代器存储在列表中.
试试这个：
arch = arch.where(Function(x)x.EndsWith(System.Environment.UserName & ".htm")).ToList()
我更喜欢扩展linq,但它只是偏好,我的工作原因是因为ToList():)
本文共计205个文字，预计阅读时间需要1分钟。
我遗失了一些非常基本的常识，我不知道是什么……我对Linq有一个例外：Dim arch As List(Of String) 'gets archive as String() and casts it as List arch=client.GetArchive().ToList() 'here exception occurs: Cannot cast an object of type 'String' to type 'List(Of String)'.
Dim arch As List(Of String) 'gets archive as String() and casts it as List arch = client.GetArchive().ToList() 'here exception occurs: Cannot cast object of type 'WhereSelectListIterator`2'... arch = From a In arch Where a.EndsWith(System.Environment.UserName & ".htm") Select a 正如它所述,你正试图将迭代器存储在列表中.
试试这个：
arch = arch.where(Function(x)x.EndsWith(System.Environment.UserName & ".htm")).ToList()
我更喜欢扩展linq,但它只是偏好,我的工作原因是因为ToList():)