此 SQL 数据表是否有任何解决方法？

Question

我有这个运行良好的 CSharp WinForms 代码

            SqlConnection loginCon = new SqlConnection
                ("Data Source=MORTDECAI;Initial Catalog=d_Authentication;Integrated Security=True;Pooling=False;");
            SqlCommand connectionCommand = new SqlCommand
                ("Select * From d_Info where Username=@username COLLATE Latin1_General_CS_AS and Password=@password COLLATE Latin1_General_CS_AS", loginCon);

            connectionCommand.Parameters.AddWithValue("@username", textUsername.Text);
            connectionCommand.Parameters.AddWithValue("@password", textPassword.Text);

            connectionCommand.Connection = loginCon;
            loginCon.Open();
            SqlDataAdapter adaptData = new SqlDataAdapter(connectionCommand);
            DataSet databaseData = new DataSet();
            DataTable virtualTable = new DataTable();

            adaptData.Fill(databaseData, "Login");
            virtualTable = databaseData.Tables["Login"];

            loginCon.Close();
            int count = databaseData.Tables[0].Rows.Count;

            if (count == 1)
            {
                if (virtualTable.Rows[0][1].ToString() == "Administrator"){
                //some codes}

注意最后一行：if (virtualTable.Rows[0][1].ToString() == "Administrator")

在 C++/CLI 上应用相同的代码时，最后一行无法按预期工作。这是 C++/CLI 中的代码

        adaptData->Fill(dtbaseData, "AdminTable");
        dtTable = dtbaseData->Tables["AdminTable"];
        Database->Close();

        sqlCount = dtbaseData->Tables[0]->Rows->Count;
        if (sqlCount == 1) {
            if (dtTable->Rows[0][1]->ToString() == "Administrator") {
                this->Hide();
                res_load->Show();
            }

我收到以下错误：

但是每当我从这样的代码中删除 [1] 时都没有错误

有什么好的处理方法吗？

此致，

乔伊

Answer 1

参见here。根据post:

Seems a problem of IntelliSense, which does not stop the compilation and execution of the program.

虽然它确实为您停止了编译（也许我错了？）但我相信解决方法可能仍然适用。

根据给定的 link，针对您的情况建议的解决方法是：

DataRow ^ row = dtTable->Rows[0];
if (row[1]->ToString() == "Administrator")
{
    this->Hide();
    res_low->Show();
}

Answer 2

我发现的另一种解决方法是这样做

                DataRow^ recAdmin = dtbaseData->Tables[0]->Rows[0];
                if (recAdmin->IsNull("AdminId")) {
                    throw gcnew IndexOutOfRangeException("No such Admin Exist!");
                } else{
                    MessageBox::Show("Login succsessfull");
                    res_load->Show();
                    this->Hide();
                }

As shown by the solution posted here

此 SQL 数据表是否有任何解决方法？

Is there any workaround on this SQL Datatable?

c#

sql

c++-cli

winforms