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int? a = row.Field <int>("XXX");
int b=a??5;//就是如果a是Null b就為5
int a = row.Field <int>("XXX")??5;
用0替代ReportsTo列中的值: IsNull(ReportsTo,0) as ReportsTo
如: string select = "SELECT EmployeeID, FirstName, LastName, Photo, IsNull(ReportsTo,0) as ReportsTo FROM Employees";