简体繁体 English

为什么将VS2010生成的所有SqlParameters的大小都设置为0？

[英]why the size of all SqlParameters generated by VS2010 are set to 0?

原文 2011-03-29 13:06:13 7 1 c#/ .net/ vb.net

why the size of all SqlParameters generated by VS2010 are set to 0, while when I look in the dataset all the columns are set to different sizes but when I read it from sqldataadapter they are all set to 0. Isn't it going to make some other issues in future? 为什么将由VS2010生成的所有SqlParameters的大小都设置为0，而当我在数据集中查看时，所有列都设置为不同大小，但是当我从sqldataadapter中读取它们时，它们都都设置为0。将来还有其他问题吗？ I mean, I have many sqlparameter with NVarChar types that they are generated by VS2010 and the size is 0!!! 我的意思是，我有很多带有NVarChar类型的sqlparameter，它们是由VS2010生成的，大小为0！ Any other information in this area will be appreciated. 在这个领域的任何其他信息将不胜感激。 Cheers! 干杯!

1 个解决方案

http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlparameter.size.aspx http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlparameter.size.aspx

"If not explicitly set, the size is inferred from the actual size of the specified parameter value." “如果未显式设置，则从指定参数值的实际大小推断大小。”

My guess is that the size has not been explicitly set; 我的猜测是尚未明确设置大小； thus it appears as the default for an Int32, which is zero, thus the size will be inferred from the actual size of the value. 因此，它似乎是Int32的默认值，该默认值为零，因此将从值的实际大小推断出大小。

(To rephrase: they're not set to 0, they're just not set at all) （换句话说：它们没有设置为0，根本就没有设置）