Question

我已经使用OleDb从用户上传中检索了两个Excel文件。我产生了以下结果：

| Location | Item Type | AmountA | AmountB | Type |
|    A     |     A     |    5    |    4    |      |

但是我想产生以下结果：

| Location | Item Type | AmountA | AmountB | Type |
|    A     |     A     |    5    |         |   A  |
|    A     |     A     |         |    4    |   B  |

这些是我的代码：

 public DataTable CombineofAdjustmentNTransaction(DataTable A, DataTable B)
    {
        DataTable TableE = new DataTable();
        TableE.Columns.Add(new DataColumn("Location"));
        TableE.Columns.Add(new DataColumn("Item Type"));
        TableE.Columns.Add(new DataColumn("AmountA)"));
        TableE.Columns.Add(new DataColumn("AmountB"));
        TableE.Columns.Add(new DataColumn("TransactionType"));

        foreach (DataRow dtE in A.Rows)
        {
            foreach (DataRow rowB in B.Rows)
            {
                if (rowB["Location"].ToString() == dtE["Location"].ToString() && rowB["Item Type"].ToString() == dtE["Item Type"].ToString() 
                    )
                {
                    var newRow = TableE.NewRow();
                    newRow["Location"] = dtE["Location"];
                    newRow["Item Type"] = dtE["Item Type"];  

                    if(dtE["Type"].ToString() == "GRN")
                    {
                        newRow["AmountA"] = dtE["AmountA"];
                        newRow["Type"] = "GRN";
                    }

                    if (rowB["Type"].ToString() == "STK_ADJ")
                    {
                        newRow["AmountB"] = rowB["AmountB"];
                        newRow["Type"] = "STK_ADJ";
                    }
                    TableE.Rows.Add(newRow);
                }
            }
        }
        return TableE;
    }
}

请帮助谢谢！

Answer 1

   public DataTable CombineofAdjustmentNTransaction(DataTable A, DataTable B)
    {
        DataTable TableE = new DataTable();
        TableE.Columns.Add(new DataColumn("Location"));
        TableE.Columns.Add(new DataColumn("Item Type"));
        TableE.Columns.Add(new DataColumn("AmountA"));
        TableE.Columns.Add(new DataColumn("AmountB"));
        TableE.Columns.Add(new DataColumn("Type"));

        foreach (DataRow dtE in A.Rows)
        {
            foreach (DataRow rowB in B.Rows)
            {
                if (rowB["Location"].ToString() == dtE["Location"].ToString() && rowB["Item Type"].ToString() == dtE["Item Type"].ToString()
                    )
                {
                    var newRow = TableE.NewRow();
                    newRow["Location"] = dtE["Location"];
                    newRow["Item Type"] = dtE["Item Type"];

                    if (dtE["Type"].ToString() == "GRN")
                    {
                        newRow["AmountA"] = dtE["AmountA"];
                        newRow["Type"] = "A";
                    }

                    if (rowB["Type"].ToString() == "STK_ADJ" && newRow["AmountA"].ToString() != "" && newRow["AmountA"].ToString() != "")
                    {
                        var BNewRow = TableE.NewRow();
                        BNewRow["Location"] = rowB["Location"];
                        BNewRow["Item Type"] = rowB["Item Type"];
                        BNewRow["AmountB"] = rowB["AmountB"];
                        BNewRow["Type"] = "B";
                        TableE.Rows.Add(BNewRow);
                    }
                    else {
                        newRow["AmountB"] = rowB["AmountB"];
                        newRow["Type"] = "B";
                    }
                    TableE.Rows.Add(newRow);
                }
            }
        }
        return TableE;
    }

Answer 2

在您的代码中，您只需调用一次DataTable.Rows.Add()方法。这就是为什么只得到一行的原因。

在下面的解决方案中，您会注意到我已经两次调用了此方法

result.Rows.Add(newRowA);
result.Rows.Add(newRowB);

这是为您提供的完整重构方法。

// made these into constants, note how it reads easier when prefixing column numbers
// added benefit of renaming the columns in a single place
const string Column1Location = "Location";
const string Column2ItemType = "Item Type";
const string Column3AmountA = "Amount A";
const string Column4AmountB = "Amount B";
const string Column5TransactionType = "Transaction Type";

public DataTable CombineofAdjustmentNTransaction(DataTable tableA, DataTable tableB)
{
    DataTable result = new DataTable();
    result.Columns.Add(new DataColumn(Column1Location));
    result.Columns.Add(new DataColumn(Column2ItemType));
    result.Columns.Add(new DataColumn(Column3AmountA));
    result.Columns.Add(new DataColumn(Column4AmountB));
    result.Columns.Add(new DataColumn(Column5TransactionType));

    foreach (DataRow rowA in tableA.Rows)
    foreach (DataRow rowB in tableB.Rows)
    {
        // check for required conditions, skip if failed (continue to the next iteration)
        if (rowA["Location"] != rowB["Location"]) continue;
        if (rowA["ItemType"] != rowB["Item Type"]) continue;

        // your logic for A
        if (rowA["Type"].ToString() == "GRN")
        {
            // create row
            DataRow newRowA = result.NewRow();
            newRowA[Column1Location] = rowA["Location"];
            newRowA[Column2ItemType] = rowA["Item Type"];
            newRowA[Column3AmountA] = rowA["AmountA"];
            newRowA[Column4AmountB] = null;
            newRowA[Column5TransactionType] = "GRN";

            // add the row
            result.Rows.Add(newRowA);
        }

        // your logic for B
        if (rowB["Type"].ToString() == "STK_ADJ")
        {
            // create row
            DataRow newRowB = result.NewRow();
            newRowB[Column1Location] = rowA["Location"];
            newRowB[Column2ItemType] = rowA["Item Type"];
            newRowB[Column3AmountA] = null;
            newRowB[Column4AmountB] = rowB["AmountB"];
            newRowB[Column5TransactionType] = "STK_ADJ";

            // add the row
            result.Rows.Add(newRowB);
        }
    }

    return result;
}

如何产生具有以下结果的数据表？

2 个答案: