Expression – 從入門到放棄

可以將一個很長很長很長的List分割成固定大小的List方便批次運算。

程式碼：

public static IEnumerable<IEnumerable<T>> ChunkBy<T>(this IEnumerable<T> source, int chunkSize)
{
    return source.Select((x, i) => new { Index = i, Value = x }).GroupBy(x => x.Index / chunkSize).Select(x => x.Select(v => v.Value));
}

public static IEnumerable<IEnumerable<T>> ChunkBy<T>(this IEnumerable<T> source, int chunkSize)

{

return source.Select((x, i) => new { Index = i, Value = x }).GroupBy(x => x.Index / chunkSize).Select(x => x.Select(v => v.Value));

}