DateTime问题

问题描述

嘿，


我总是在努力解决以下问题：


我有一个对象obj，其属性为paydate（type = DateTime）

现在，在实例化对象并执行几项操作之后，我还要检查我的paydate是否仍然是空的。

我该怎么做？


我尝试过几样的事情（都有错误）：

if（obj.paydate == null）

if（obj.paydate.gettype（ ）== System.DBnull）

if（obj.paydate == 01/01/0001）

等.....


另一个问题：

当我想要实例化对象并用sql-query（sql-database）中的数据填充它时。从sql for paydate = null接收的值。

如何在datareader中测试从sql接收的数据是否为空，因此我没有在obj.paydate中放置任何内容。

tkx，

Nic

解决方案

hey,

I always struggle with the following:

I have an object obj with a property paydate (type = DateTime)
Now, after instantiating the object and do several things, I want too check if my paydate is still empty.
How can I do this?

I tried several things like (all with errors):
if (obj.paydate == null)
if (obj.paydate.gettype() == System.DBnull)
if (obj.paydate == 01/01/0001)
etc.....

Another question :
When I want to instantiate the object and fill it with data from an sql-query (sql-database). The value received from sql for paydate = null.
How can I test in the datareader that the received data from sql is null and so I put nothing in obj.paydate.
tkx,
Nic

解决方案

Use the IsDbNull() in the DataReader. You''ll still have to work out
what to put into paydate in that case though.

--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet
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