c# - 为什么我从 C# 到 VB 的转换不起作用？

Question

原代码:

public List<Contact> GetContactListEntityCompiledLINQ()
{
    if (entities == null) entities = new CompanyEntities();

    ObjectQuery<Contact> contacts = compiledQuery.Invoke(entities);
    if (NoTracking) contacts.MergeOption = MergeOption.NoTracking;

    return contacts.ToList<Contact>();
}

我转换后的代码:

  Public Function GetContactListEntityCompiledLINQ() As List(Of Contact)

        If entities Is Nothing Then entities = New CompanyEntities()

        Dim contacts As ObjectQuery(Of Contact) = compiledQuery.Invoke(entities)
        If NoTracking Then contacts.MergeOption = MergeOption.NoTracking

        Return contacts.ToList(Of Contact)()

    End Function

我在 VB 版本的 Visual Studio 中遇到错误:

错误 1 ​​“System.Linq.Enumerable”中定义的扩展方法“Public Function ToList() As System.Collections.Generic.List(Of TSource)”不是通用的(或没有自由类型参数)，因此不能有类型参数。

错误在 Return 语句上，Contact 带有蓝色波浪线下划线。

有什么想法吗？

Answer 1

改成这样:

Public Function GetContactListEntityCompiledLINQ() As List(Of Contact)

    If entities Is Nothing Then entities = New CompanyEntities()

    Dim contacts As ObjectQuery(Of Contact) = compiledQuery.Invoke(entities)
    If NoTracking Then contacts.MergeOption = MergeOption.NoTracking

    Return contacts.ToList()

End Function