c# - 查询表达式中缺少（运算符）

Question

Lid 是 ms 访问中的自动编号字段。错误消息：查询表达式“Lid=”中缺少（运算符）

db.Search_Grid_Add(LoanInfo_dgv, "Select * From Loan_Info Where Lid=" + LoanId_cb.Text + "");

Answer 1

也许LoanId_cb.Text不被解析为int？尝试：

int lid;
string lidText = LoanId_cb.Text.Trim();
if(int.TryParse(lidText , out lid))
{
    db.Search_Grid_Add(LoanInfo_dgv, "Select * From Loan_Info Where Lid="+lidText );
}
else
{
   MessageBox.Show(lidText + " can't be parsed as int.");
}