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我有两个 DataSet,每个 DataTable 在里面。

数据集#1:

        DataTable table = new DataTable(name);
        table.Columns.Add("ID", typeof(int));
        table.Columns.Add("Customer Name",typeof(string));
        table.Columns.Add("Contact Name", typeof(string));
        table.Columns.Add("Adress", typeof(string));
        table.Columns.Add("City", typeof(string));
        table.Columns.Add("Postal Code", typeof(string));
        table.Columns.Add("Country", typeof(string));
        string mem;
        Console.Clear();
        Console.WriteLine("| {0} | {1} | {2} | {3} | {4} | {5} |",
            table.Columns[1], table.Columns[2], table.Columns[3],
            table.Columns[4], table.Columns[5], table.Columns[6]);
        int count=1;
        do
        {
            table.Rows.Add(count, Console.ReadLine(), Console.ReadLine(), Console.ReadLine(), 
                Console.ReadLine(), Convert.ToInt32(Console.ReadLine()), Console.ReadLine());
            Console.WriteLine("if finished, type end");
            mem=Console.ReadLine();
            count++;
        }
        while (mem != "end");

        DataSet set = new DataSet();
        set.Tables.Add(table);

和数据集#2:

(“加载”是 DataSet #1)

        string srch = Console.ReadLine();
        string ask = "[Customer Name] like '%"+srch+"%' OR [Contact Name] like '%"+srch+"%' OR [Adress] like '%"+srch+"%' OR [City] like '%"+srch+"%' OR [Postal Code] like '%"+srch+"%' OR [Country] like '%"+srch+"%'";
        DataRow[] foundRows = load.Tables[0].Select(ask);
        DataTable dt = new DataTable();
        table.Columns.Add("ID", typeof(int));
        table.Columns.Add("Customer Name",typeof(string));
        table.Columns.Add("Contact Name", typeof(string));
        table.Columns.Add("Adress", typeof(string));
        table.Columns.Add("City", typeof(string));
        table.Columns.Add("Postal Code", typeof(string));
        table.Columns.Add("Country", typeof(string));
        foreach (DataRow item in foundRows)
        {
            dt.Rows.Add(item.ItemArray);
        }
        DataSet set = new DataSet();
        set.Tables.Add(dt);

将 DataSet #2 发送到函数 Print() 时,在 DataSet #1 的“dtc.AsEnumerable()”处出现错误,一切正常...

    static void Print(DataSet load)
    {
        DataTable dtc = load.Tables[0];
        List<int> maxlenght = Enumerable.Range(0, dtc.Columns.Count)
                                        .Select(col => dtc.AsEnumerable()
                                        .Select(row => row[col]).OfType<string>()
                                        .Max(val => val.Length)).ToList();

        //rest prints DataTable on a grid in console
    }

这怎么可能,而两个数据集在结构上是相同的?

4

0 回答 0