Question

我的表单中有两个usercontrol为标签文本框datepicker 第一个标签=从日期开始第二个标签=到期日还有一个数据网格和一个按钮现在我在数据网格中的两个日期之间数据，来自用户控件中的两个文本框 我正在尝试使用此代码，但它无效：

SqlConnection cs = new SqlConnection("Data Source=IRIS-CSG-174;Initial Catalog=library_system;Integrated Security=True");
            cs.Open();
            SqlCommand cmd = new SqlCommand("select * from dbo.lib_issue_details where book_issue_on between'" + userControl11+ "'" + "and'" + userControl12.Text + "'", cs);
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            DataTable dt = new DataTable();
            DataSet ds = new DataSet();
            da.Fill(ds, "lib_issue_details");
            dataGridView1.DataSource = ds.Tables[0];
            dataGridView1.DataBindings.Add(new Binding("text", ds, "lib_issue_details"));

            cs.Close();

Answer 1

假设标签具有正确的日期格式，则.Text上缺少userControl11

尝试

SqlCommand cmd = new SqlCommand("select * from dbo.lib_issue_details where book_issue_on between'" + userControl11.Text + "'" + "and'" + userControl12.Text + "'", cs);

偶然的事与你的问题无关。查看参数化查询，而不是将值连接到查询字符串中。另外一个更好的做法是将using用于像这样的IDisposable实体

using (SqlConnection cs = new SqlConnection(...) )
{
  ...
}

Answer 2

您必须更正命令文本：

SqlCommand cmd = new SqlCommand(@"select * from dbo.lib_issue_details 
    where book_issue_on between'" + userControl11.Text+ "' and '" + 
    userControl12.Text + "'", cs);

用户控制文本框值到datagrid

2 个答案: