Question

我有datagridview与datatable绑定并使用DataPropertyName datagridview仅显示4列database。
这是我将database绑定到datagridview：

的方法

string StrCon = System.Configuration.ConfigurationManager.ConnectionStrings
["FeedLibraryConnectionString"].ConnectionString;
OleDbConnection Connection = new OleDbConnection(StrCon);
OleDbDataAdapter DataA = new OleDbDataAdapter("Select * from SelectedFeeds", Connection);
DataTable DTable = new DataTable();
DataA.Fill(DTable);

frm.RationFeedsdataGridView.AutoGenerateColumns = false;

frm.RationFeedsdataGridView.Columns[1].Name = "نام خوراک";
frm.RationFeedsdataGridView.Columns[1].HeaderText = "نام خوراک";
frm.RationFeedsdataGridView.Columns[1].DataPropertyName = "Feed Name / Description";

frm.RationFeedsdataGridView.Columns[2].Name = "مقدار (کیلوگرم)";
frm.RationFeedsdataGridView.Columns[2].HeaderText = "مقدار (کیلوگرم)";
frm.RationFeedsdataGridView.Columns[2].DataPropertyName = "Quantity";

frm.RationFeedsdataGridView.Columns[3].Name = "درصد (خوراک)";
frm.RationFeedsdataGridView.Columns[3].HeaderText = "درصد (خوراک)";
frm.RationFeedsdataGridView.Columns[3].DataPropertyName = "Percent";

frm.RationFeedsdataGridView.DataSource = DTable;

到目前为止没有错，

现在我希望当用户更改Columns[2]的值时，它的值会自动插入（并在更新之后）到database我尝试自己使用此代码，但似乎是＆＃39 ;错了，代码是：

string StrCon = System.Configuration.ConfigurationManager.ConnectionStrings
["FeedLibraryConnectionString"].ConnectionString;
OleDbConnection Connection = new OleDbConnection(StrCon);
OleDbCommand Cmd = new OleDbCommand();
Cmd.Connection = Connection;
double Quantity = Convert.ToDouble(frm.RationFeedsdataGridView.CurrentCell.Value);
string FeedName = frm.RationFeedsdataGridView.CurrentRow.Cells[1].Value.ToString();
Connection.Open();
Cmd.CommandText="Update SelectedFeeds set Quantity=" +Quantity  'Where Feed Name / Description'= FeedName;
Cmd.ExecuteNonQuery();
Connection.Close();

第一个问题是我的CommandText错了，我不知道如何解决它。我该怎么办？

Answer 1

坦克到@LarsTech的答案是：

public static void UpdateRationFeeds(Form1 frm)
{
    string StrCon = System.Configuration.ConfigurationManager.ConnectionStrings["FeedLibraryConnectionString"].ConnectionString;
    OleDbConnection Connection = new OleDbConnection(StrCon);
    OleDbCommand Cmd = new OleDbCommand();
    Cmd.Connection = Connection;
    double Quantity = Convert.ToDouble(frm.RationFeedsdataGridView.CurrentCell.Value);
    string FeedName = frm.RationFeedsdataGridView.CurrentRow.Cells[1].Value.ToString();
    Connection.Open();
    Cmd.CommandText = "Update SelectedFeeds set Quantity=@quantity Where SelectedFeeds.[Feed Name]=@feedname";
    Cmd.Parameters.Add("@quantity", OleDbType.Double).Value = Quantity;
    Cmd.Parameters.Add("@feedname", OleDbType.LongVarChar).Value = FeedName;
    Cmd.ExecuteNonQuery();
    Connection.Close();
}

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