c# DateTime Misunderstanding [closed]

问题

This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center.

Closed 8 years ago.

No longer relevant:

In one of the comments below the OP mentions a private object DateTime() { throw new NotImplementedException(); } slipping in. It happens .

---

I have a DateTime field in a SqlCe database. I wish to add the time the row is created hence the need for:

DateTime now = DateTime.Now;

However this issue i am getting is that this is 'a method which is not valid in the given context'. Im guessing its something to do with it being static and im using it in a non static function perhaps ?

Just to ask in the same thread

SqlParameter Created = new SqlParameter("@Created", SqlDbType.DateTime);
**Created.Value = DateTime.Now; <--- gives error DateTime() is method which is not valid in the given context**
SqlCeCommand mySQLCommand = dbCon.CreateCommand();
mySQLCommand.CommandText = "INSERT into table (Created) VALUES (@Created)";
mySQLCommand.Parameters.Add(vetCreated);
mySQLCommand.ExecuteNonQuery(); 

Does this seem like a resonable list commands to add DateTime to the database?

回答1:

In this line:

mySQLCommand.Parameters.Add(vetCreated);

I don't know what vetCreated is, but I suppose that it's a method judging by the error message.

You should use your parameter object Created there instead.

回答2:

You can simplify your code:

mySQLCommand.CommandText = "INSERT into table (Created) VALUES (@Created)";
mySQLCommand.Parameters.AddWithValue("Created", DateTime.Now);
mySQLCommand.ExecuteNonQuery(); 

I believe this will also fix your issue as it is not clear what vetCreated is in your code.

[Update]

Not sure how you handle connection and command as your code doesn't show it. Here is the full code to insert row into a table:

using (var connection = new SqlConnection("your connection string"))
using (var command = connection.CreateCommand())
{
    command.CommandText = "INSERT into table (Created) VALUES (@Created)";
    command.Parameters.AddWithValue("Created", DateTime.Now);
    connection.Open();
    command.ExecuteNonQuery();
}

来源：https://stackoverflow.com/questions/6090577/c-sharp-datetime-misunderstanding