c# - 从循环中加入数据表并合并到一个数据集中

Question

我有这样的要求，即用户请求一个或多个零件号。我需要在一个数据集中显示所有结果

例如：请求序列号

PartNumber  Required Quantity
   A               2  
   B               1
   C               3

代码：

//循环请求

foreach (DataRow a in request.Rows)
{
   //select top(Quantity) SerialNumber,PartNumber where PartNumber=@PartNumber
   var dt = new DataTable();
} 

//1. 零件编号 A

     SerialNumber  Partnumber
1                A
2                A

+

//2。零件编号 B

     SerialNumber  Partnumber
1                B

//3. 零件编号 C

     SerialNumber  Partnumber
1                C
2                C
3                C

//加载到数据集

结果将是这样的：

SerialNumber  Partnumber
1                A
2                A
1                B   
1                C
2                C
3                C 

感谢问候

Answer 1

我不确定您希望在这里加入哪两个表以及使用什么键，但不管怎样，最简单的方法是使用 LINQ to Dataset。例如，

var query = from a in table1
            join
            b in table2 
            on
            a.FkColumn = b.PKColumn select a,b;

Answer 2

请检查以下逻辑：

DataTable myDataTable = new DataTable();
        DataColumn PartNumber = new DataColumn("PartNumber");
        DataColumn RequiredQuantity = new DataColumn("RequiredQuantity");
        myDataTable.Columns.Add(PartNumber);
        myDataTable.Columns.Add(RequiredQuantity);

        DataRow dataRowPN1 = myDataTable.NewRow();
        DataRow dataRowPN2 = myDataTable.NewRow();
        DataRow dataRowPN3 = myDataTable.NewRow();


        dataRowPN1["PartNumber"] = "A";
        dataRowPN2["PartNumber"] = "B";
        dataRowPN3["PartNumber"] = "C";
        dataRowPN1["RequiredQuantity"] = "2";
        dataRowPN2["RequiredQuantity"] = "1";
        dataRowPN3["RequiredQuantity"] = "3";
        myDataTable.Rows.Add(dataRowPN1);
        myDataTable.Rows.Add(dataRowPN2);
        myDataTable.Rows.Add(dataRowPN3);
        int  i = myDataTable.Rows.Count;

        DataTable joinDataTable = new DataTable();
        DataColumn SerialNumber = new DataColumn("SerialNumber");
        DataColumn JoinPartNumber = new DataColumn("PartNumber");
        joinDataTable.Columns.Add(SerialNumber);
        joinDataTable.Columns.Add(JoinPartNumber);
        foreach (DataRow dr in myDataTable.Rows)
        {
            for (int count = 1; count <= Convert.ToInt16(dr["RequiredQuantity"]); count++)
            {
                DataRow joindataRow = joinDataTable.NewRow();
                joindataRow["SerialNumber"] = count.ToString().Trim();
                joindataRow["PartNumber"] = dr["PartNumber"].ToString().Trim();
                joinDataTable.Rows.Add(joindataRow);
            }
        }
        Response.Write(joinDataTable.Rows.Count);