[英]How to convert a data table data into comma-separated list using lambda expression in C#?
DataTable dt = new DataTable();
dt.Columns.Add(new DataColumn("SiteName",typeof(string));
dt.Columns.Add(new DataColumn("CountryName",typeof(string));
dt.Rows.Add("ABC","India");
dt.Rows.Add("ABC","China");
dt.Rows.Add("DEF","Japan");
dt.Rows.Add("DEF","Pakistan");
dt.Rows.Add("DEF","Italy");
所需的輸出
SiteName CountryName
---------------------------------------
ABC India,China
DEF Japan,Pakistan,Italy
---------------------------------------
請幫助我使用 C# 使用 lambda 表達式獲得上述結果。
提前致謝。
嘗試以下操作:
DataTable dt=new DataTable();
dt.Columns.Add("SiteName",typeof(string));
dt.Columns.Add("CountryName",typeof(string));
dt.Rows.Add("ABC","India");
dt.Rows.Add("ABC","China");
dt.Rows.Add("DEF","Japan");
dt.Rows.Add("DEF","Pakistan");
dt.Rows.Add("DEF","Italy");
var results = dt.AsEnumerable()
.GroupBy(x => x.Field<string>("SiteName"))
.Select(x => new { siteName = x.Key, countries = string.Join(",", x.Select(y => y.Field<string>("CountryName")))})
.ToList();
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