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如何使用selectfieldString和resultFieldString編寫動態groupby? 樣本:C#linq group按字段和結果字符串?
public class Customer
{
public int Id;
public string Name;
public string LastName;
public decimal Amount;
}
var lst = new List<Customer>();
lst.Add(new Customer { Id = 1, Name = "vahid", LastName = "Aghilpour", Amount = 15 });
lst.Add(new Customer { Id = 1, Name = "hamid", LastName = "rezaei", Amount = 35 });
lst.Add(new Customer { Id = 1, Name = "vahid", LastName = "Aghilpour", Amount = 15 });
string[] field = { "Name", "LastName" };
string aggrigatefield = "Sum(Amount)";
lst.GroupBy(field).Select(aggrigatefield);---??????????
你的問題是相當含糊。沒有上下文,我不明白你想達到什麼。請使用更多代碼編輯您的問題,並嘗試解釋您要實現的目標。 –
如何獲得關鍵與選擇字段到多列---新(總和(金額)作爲SumAmount,總和(Id)作爲SumId,關鍵)給項目鍵,但我是新的(總和(金額)爲SumAmount,Sum(Id )作爲SumId,Name,LastName) – VahidAghilpour