c# - C# 获取访问 2010 自动编号

Question

嗨，我正在提交要访问的表单，但希望在我提交后获得访问分配的自动编号以显示在文本框中。下面是我有的，任何建议都会很棒！

string cmdstr = "Insert into  TaskPerformed(TaskType,OtherType,Analyst,DateCompleted)Values(@b,@c,@d,@e)";
string query2 = "Select @@IDENTITY";

OleDbConnection con1 = new OleDbConnection(constr);
OleDbCommand com = new OleDbCommand(cmdstr, con1);
OleDbCommand cmdNewID = new OleDbCommand("SELECT @@IDENTITY", con1);//

con1.Open();

cmd.CommandText = query2;
com.ExecuteNonQuery();
con1.Close();

label16.Text = cmdNewID.ToString();

Answer 1

看起来您遇到的问题是因为您没有执行第二个命令......并且您在使用它之前关闭了连接

using(OleDbCommand cmdNewID = new OleDbCommand("SELECT @@IDENTITY", con1))
{
    con1.Open();

    cmd.CommandText = query2;
    com.ExecuteNonQuery();

    label16.Text = cmdNewID.ExecuteScalar();
}