c# - “查询末尾缺少引号分隔符。” WinCE PDA 应用程序中的错误

Question

在我的 WinCE PDA 应用程序中，我正在将扫描的条形码值与数据库中的条形码值进行比较以生成一个表格。

我像这样构建查询：

for (int i = 0; i < listBox2.Items.Count; i++)
{
    if (i == 0)
    {
        sb.Append("Select * from ToolsBar where BarcodeValue in (");
    }

    sb.Append("'" + listBox2.Items[i] + "',");

}

sb.Length = sb.Length - 1;
sb.Append(")");

并在这里使用它：

cmd.CommandText = sb.ToString();
cmd.CommandType = CommandType.Text;

cmd.Connection = con;
con.Open();

reader = cmd.ExecuteReader(); // this is where the error came out  "A quotation mark delimiter is missing from the end of the query." 
reader.Close();
SqlCeDataAdapter ad = new SqlCeDataAdapter(sb.ToString(), con);
DataSet ds = new DataSet();
ad.Fill(ds);
dataGrid2.DataSource = ds.Tables[0];

con.Close();
sb.Length = 0;

Answer 1

用于构建查询的备用循环，无需更改字符串长度：

for (int i = 0; i < listBox2.Items.Count; i++)
{
    if (i == 0)
    {
        sb.Append("Select * from ToolsBar where BarcodeValue in (");
        sb.Append("'" + listBox2.Items[i] + "'");
    }
    else
    {
        sb.Append(",'" + listBox2.Items[i] + "'");
    }
}

sb.Append(")");