无法将类型“System.Guid?”隐式转换为“System.Guid”。存在一个显式转换(是否缺少强制转换?)

[zjy1985cool]

using (OfficeChannel.OfficeChannelDataContext MyCon = new OfficeChannel.OfficeChannelDataContext(ConfigurationManager.ConnectionStrings["OfficeChannelConnectionString_Web"].ConnectionString))
{
var linqtxt = from i in MyCon.Class
select new
{
iBigID=i.classBigTypeID,
};

try
{
var b = linqtxt.ToArray()[0];
bigID = b.iBigID;/////无法将类型“System.Guid?”隐式转换为“System.Guid”。存在一个显式转换(是否缺少强制转换?)
}

[长沙三毛]

Guid g = Guid.NewGuid(); // ?

[满衣兄]

bigID也定义为System.Guid?类型，问号表示允许空。

[zjy1985cool]

[Quote=引用 1 楼 hulihui 的回复:]
Guid g = Guid.NewGuid(); // ?
[/Quote]
bigID = new Guid(b.iBigID);

错误 56 与“System.Guid.Guid(byte[])”最匹配的重载方法具有一些无效参数 E:\OfficeChannel\OfficeChannel\CourseChannel\UserControl\classList.ascx.cs 69 25 OfficeChannel

[zjy1985cool]

bigID = new Guid(convert.tostring(b.iBigID));