从DataTable获取值而不将数据绑定到UI控件？

Question

I always get values from the database directly to a control like this:

Code-behind:

DataTable table = GetUserInfo();

UserInfo.DataSource = table;
UserInfo.DataBind();

string FirstName = lblFirstName.Text;
string LastName = lblLastName.Text;
DateTime BecomeAMember = DateTime.Parse(lblBecomeAMember.Text);

Markup:

<asp:Label ID="lblCity" runat="server" Text='<%# Eval("FirstName") %>' />
<asp:Label ID="lblLastName" runat="server" Text='<%# Eval("LastName") %>' />
<asp:Label ID="lblBecomeAMember" runat="server" Text='<%# Eval("BecomeAMember", "{0:dd MMM yyy) %>' />

There has to be a way to use the data in code-behind without putting it to a label and then use String text = label.Text;

I need the minutes and hours from BecomeAMember , and I don't want to use another Label with the full DateTime and make it invisible. It would be nice to know how to get the other values as well.

Answer 1

You may use DataTable methods to read values directly from the table object.

For instance,

string firstName = table.Rows[0]["FirstName"].ToString();

or

foreach (DataRow row in table.Rows)
{
    //
}

Or use Select() method to search on specified field.

DataRow[] rows = table.Select("column1='value1'");

Answer 2

Yes, you can directly investigate the data held in the DataTable .

DataTable can be made into an IEnumerable , and can be queried. In your case:

var datetimes = table.AsEnumerable().Select(x => x.Field<DateTime>("BecomeAMember"));

If you really only expect a single row, you can do either:

var dt = table.AsEnumerable().Select(x => x.Field<DateTime>("BecomeAMember")).Single();

or:

var dt = (DateTime) table.Rows[0]["BecomeAMember"];

Then format dt using ToString with a format string.