为什么 SqlDataAdapter 的 fill 不允许我添加一行，其自身的行值与外观相同？

Question

为什么 SqlDataAdapter 的 Fill 方法不允许我添加与其自身行的值与外观相同的行？我无法成功提供与 DataTable 中填充的行出现在同一行的行的值。 Check this out:

using (SqlDataAdapter a = new SqlDataAdapter("SELECT SIPNO, SERINO, TARIH FROM SNOHAREKETLER WHERE Cast(TARIH as DATE) BETWEEN '2015/03/19' AND '2015/03/20' AND (TEZNO = 'T23' OR TEZNO = 'T31') AND CIKTI is null", c))
            {
                // 3
                // Use DataAdapter to fill DataTable
                DataTable t = new DataTable();
                a.Fill(t);

                t.Columns.Add("MyColumn", typeof(string));

                DataRow workRow;

                int iGetCount = t.Rows.Count;

                for (int i = 0; i <= iGetCount - 1; i++)
                {
                    workRow = t.NewRow();
                    workRow["MyColumn"] = i;
                    t.Rows.Add(workRow);
                }

                // 4
                // Render data onto the screen
                dataGridView1.DataSource = t;
            }

Answer 1

这是我的问题的解决方案。我搜索并咨询了某人。我的问题是尝试添加一个 NewRow，这导致了问题。

DataTable t = new DataTable();
a.Fill(t);

DataColumn newCol = new DataColumn("NewColumn", typeof(string));
newCol.AllowDBNull = true;
t.Columns.Add(newCol);
foreach (DataRow row in t.Rows)
{
     row["NewColumn"] = "With String";
}
dataGridView1.DataSource = t;

为什么 SqlDataAdapter 的 fill 不允许我添加一行，其自身的行值与外观相同？

Why does SqlDataAdapter's fill not allow me to add a row with the same its own rows' value as appearance?

c#

datagridview

sqldataadapter