更改数据网格的数据集数据

Question

我正在尝试更新数据集中的属性，然后将其显示在数据网格中。但是，当我尝试将日期分配给我的 row.ItemArray[0] 时，它似乎没有更新。不在调试中，也不在数据网格中。

DataSet ds = new DataSet();
connection.Open();
adapter.Fill(ds);

foreach (DataTable table in ds.Tables)
{
    foreach (DataRow row in table.Rows)
    {
        string date = row.ItemArray[0].ToString();
        date = date.Remove(date.Length - 12);
        row.ItemArray[0] = date;

        foreach (object item in row.ItemArray)
        {
            // read item
            //Console.WriteLine(item.ToString());
        }
    }
}
ds.AcceptChanges();
invoicesDataGrid.AutoGenerateColumns = true;
invoicesDataGrid.ItemsSource = ds.Tables[0].DefaultView;

Answer 1

如下所示进行选择查询

select cast(yourdatecolumnName as date) As date from yourtableName

Answer 2

将您的代码更改为以下内容。你不需要那么多嵌套的 foreach 循环

DataSet ds = new DataSet();
connection.Open();
adapter.Fill(ds);
DataTable table = ds.Tables[0];

foreach (DataRow row in table.Rows)
{
    for (int i = 0; i < row.ItemArray.Length; i++) 
    {
       string date = row.ItemArray[0].ToString();
       date = date.Remove(date.Length - 12);
       string val = row[i].ToString();
       row[i] = date;
       Debug.WriteLine("oldValue: {0}, newValue: {1}", val, row[i].ToString());
    }
}
invoicesDataGrid.AutoGenerateColumns = true;
invoicesDataGrid.ItemsSource = table.DefaultView;