[英]Linq, combining multiple records into comma separated string, grouped by distinct value
我試圖做一個groupby區別,然后建立一個csv字符串:
[FROM]是一對多聯接:
var allCustomerRoles = (from cr in Customers
join r in CustomerRoles
on cr.Role_ID equals r.Role_ID
select new { cr.Customer_No_, r.Role_ID });
因此,問題是,能否請您告訴我如何編寫LINQ查詢以到達[TO]結構,在該結構中,Customer_No_是不同的,並且Role_ID值已連接到CSV字符串中。
謝謝@ reda-mattar,您的鏈接使我找到了解決方案,這是我想要的:
var allCustomerRoles = (from cr in Customers
join r in Roles
on cr.Role_ID equals r.Role_ID
group r.Role_ID by cr.Customer_No_ into g
select new { Customer_No_ = g.Key, Role_ID = string.Join(",", g.ToArray()) });
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