將SQL查詢轉換為linq查詢

Question

我有以下查詢，我想用Linq（使用c＃）編寫。 我該怎么辦？

declare @parentId bigint
set @parentId = (select ArticlePart from tbl_Article where ArticleID = 70001)
declare @ids varchar(100)
set @ids=''
while @parentId is not null
begin
    set @ids = @ids +CAST( @parentId as varchar(50))+','
    set @parentId = (select ArticlePart from tbl_Article where ArticleID = @parentId)
end

Answer 1

並不是說這可能是解決問題的最佳方法，而是回答這個問題：

var ids = string.Join(",", ArticleQueriable(articles, 70001));


Queriable<int> ArticleQueriable(Queriable<Article> tbl_Article, int parentID)
{
    while (true)
    {
        var parent = tbl_Article.SingleOrDefault(a => a.ArticleID == parentID);

        if (parent != null)
        {
            parentID = parent.ArticlePart.Dump();
            yield return parentID;
        }
        else
        {
            yield break;
        }
    }
}