在C＃業務移調數據對象

Question

我有以下情形

List<Class> Classes = new List<Class>(); 
Class c1 = new Class() { ClassID = 1, Name = "Class1", Abbreviation = "CLS1" }; Classes.Add(c1); 
Class c2 = new Class() { ClassID = 2, Name = "Class2", Abbreviation = "CLS2" }; Classes.Add(c2); 
Class c3 = new Class() { ClassID = 3, Name = "Class3", Abbreviation = "CLS3" }; Classes.Add(c3); 

List<ClassCode> ClassCodes = new List<ClassCode>(); 
ClassCode cc1 = new ClassCode() { ClassID = 1, ClassCodeID = 1, Code = "CC1", Description = "CCD1", Class = c1 }; ClassCodes.Add(cc1); 
ClassCode cc2 = new ClassCode() { ClassID = 1, ClassCodeID = 2, Code = "CC2", Description = "CCD2", Class = c1 }; ClassCodes.Add(cc2); 
ClassCode cc3 = new ClassCode() { ClassID = 2, ClassCodeID = 3, Code = "CC3", Description = "CCD3", Class = c2 }; ClassCodes.Add(cc3); 
ClassCode cc4 = new ClassCode() { ClassID = 2, ClassCodeID = 4, Code = "CC4", Description = "CCD4", Class = c2 }; ClassCodes.Add(cc4); 
ClassCode cc5 = new ClassCode() { ClassID = 3, ClassCodeID = 5, Code = "CC5", Description = "CCD5", Class = c3 }; ClassCodes.Add(cc5); 
ClassCode cc6 = new ClassCode() { ClassID = 3, ClassCodeID = 6, Code = "CC6", Description = "CCD6", Class = c3 }; ClassCodes.Add(cc6); 

我試圖使用LINQ轉在下面的格式

Class1 | CLS1 | Class2 | CLS2 | Class3 | CLS3  - Columns 
--------------------------------------------------------------------------- 
CCD1CCD2 | CC1CC2 | CCD3CCD4 | CC3CC4 | CCD5CCD6 | CC4CC5 - Row 

• 列標頭是值以上數據基於ClassID（ClassCode）的名稱（類別）和縮寫（類）
• 值是Code（ClassCode）和Description（ClassCode）的連接 - Map是Code goe s到縮寫列和描述轉到名稱列

• 當您想在運行時創建屬性時，DataTable是合適的 - 任何其他選項都將受到讚賞。

  請幫忙!!

Answer 1

你沒有解釋你爲什麼要這樣做。 可能有其他的方式來實現你想要的。

無論如何，下面的代碼應該工作。 它產生一個DataTable，我認爲這是一個非常適合這樣的：

var dt = new System.Data.DataTable("Transpose");   

foreach (var c in Classes) 
{ 
    var dc1 = new System.Data.DataColumn(c.Name, typeof(string)); 
    var dc2 = new System.Data.DataColumn(c.Abbreviation, typeof(string)); 
    dc1.ExtendedProperties.Add("ID", c.ClassID); 
    dc2.ExtendedProperties.Add("ID", c.ClassID); 
    dt.Columns.AddRange(new System.Data.DataColumn[] { dc1, dc2 }); 
} 

var dr = dt.NewRow(); 

for (int i = 0; i < dt.Columns.Count; i++) 
{ 
    var col = dt.Columns[i]; 
    dr[i++] = ClassCodes.Where(cc => cc.ClassID == (int)col.ExtendedProperties["ID"]) 
         .Select(cc => cc.Description) 
         .Aggregate((first, next) => first + next); 
    col = dt.Columns[i]; 
    dr[i] = ClassCodes.Where(cc => cc.ClassID == (int)col.ExtendedProperties["ID"]) 
         .Select(cc => cc.Code) 
         .Aggregate((first, next) => first + next); 
} 

dt.Rows.Add(dr);