我想创建一个窗体,用户可以在数据网格视图中查看数据库中的数据。我希望用户能够选择喜欢从哪个开始的时间从一个组合框中cmbDate,周期到另一个组合框cmbDateTo.I写了下面的代码:在数据网格视图中显示定期的自定义数据
命名空间linqToSql_trial { 公共部分类frmMonthlyOperatorStatistics:Form { private userLoginDataContext dc;
public frmMonthlyOperatorStatistics()
{
InitializeComponent();
dc = new userLoginDataContext();
}
private void LoadData()
{
cmbDate.DataSource = dc.dailyOperatorStatistics.Select(x=>x.date);
cmbDate.DisplayMember = "date";
cmbDate.ValueMember = "date";
}
private void LoadDateTo()
{
cmbToDate.DataSource = from to in dc.dailyOperatorStatistics
select to;
cmbToDate.DisplayMember = "date";
cmbToDate.ValueMember = "date";
}
private void btnLoad_Click(object sender, EventArgs e)
{
this.operatorStatDataGridView.DataSource = dc.dailyOperatorStatistics.Where(x => x.date >= Convert.ToDateTime(cmbDate.SelectedItem) && <= Convert.ToDateTime(cmbToDate.SelectedItem));
}
private void frmMonthlyOperatorStatistics_Load(object sender, EventArgs e)
{
LoadData();
LoadDateTo();
}
} } 它通过部分生成上的按钮点击方法错误< = Convert.ToDateTime(cmbToDate.SelectedItem));