我有以下代码,我正在.NET 4.0项目中编译。
但是我遇到了以下错误。我已经在引用中默认包含了System.dll。我可能做错了什么?
public static class Ext
{
public static IEnumerable<T> Where(this IEnumerable<T> source, Func<T, bool> predicate)
{
if (source == null)
{
throw new ArgumentNullException("source");
}
if (predicate == null)
{
throw new ArgumentNullException("predicate");
}
return WhereIterator(source, predicate);
}
private static IEnumerable<T> WhereIterator(IEnumerable<T> source, Func<T, bool> predicate)
{
foreach (T current in source)
{
if (predicate(current))
{
yield return current;
}
}
}
}
但是我遇到了以下错误。我已经在引用中默认包含了System.dll。我可能做错了什么?
Error 1 The type or namespace name 'T' could not be found (are you missing a using directive or an assembly reference?)
Error 2 The type or namespace name 'T' could not be found (are you missing a using directive or an assembly reference?)
Error 3 The type or namespace name 'T' could not be found (are you missing a using directive or an assembly reference?)