dbnull

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Most efficient way of dealing with DBNull in .NET [duplicate]

This question already has answers here:开发者_开发百科 Closed 11 years ago. Possible Duplicate: What is the best way to deal with DBNull's[详细]

2023-04-13 07:04 分类：问答
System.IndexOutOfRangeException on SQLDataReader Value Using C#

I have a SQLDataReader that returns three integers. However, there are occasions when two of the integers will return null values.[详细]

2023-04-12 11:49 分类：问答
Handling DBNull and null in ASP.NET

What is the best way of rewriting these (erroneous) lines? bool? result = dr[\"result\"] == DBNull.Value ? null : Convert.ToInt32(dr[\"result\"]);[详细]

2023-04-03 19:37 分类：问答
Linq to DataTable - Cannot cast DBNull

New to Linq, so apologies if this is basic. This query is throwing up the error {\"Cannot cast DBNull.Value to type \'System.Int64\'. Please use a nullable type.\"} when I enumerate the results.[详细]

2023-03-28 11:59 分类：问答
How to determine if a parameter value was passed to a stored procedure

I want to create a stored procedure (in SQL Server 2008 R2) that will update a record in a table based on the table\'s PK.[详细]

2023-03-28 06:16 分类：问答
?? operator in system.DBNull

Is there an operator or built in function to simplyfy this: myVal = object1.object2.something(a,b).dataColumn.toString()==\"\"?object1.object2.something(a,b).dataColumn.toString():\"-\";[详细]

2023-03-15 01:55 分类：问答
What Is DBNull Needed For Anyway? [duplicate]

This question already has answers here: Closed 11 years ago. Possible Duplicate: What is the point of DBNull?[详细]

2023-03-14 03:32 分类：问答
Informix (C#): How do I properly set/unset a blob field?

IBM Informix SDK: Statement: Update mytable set myblobcolumn = ? where myid = 1; using (IfxConnection conn = GetIfxConnection())[详细]

2023-03-12 12:41 分类：问答
DropDownList can't bind to DbNull

I have a DropDownList trying to bind to DbNull and it\'s not happy about it. I\'ve seen advice about creating a ListItem wi开发者_JAVA百科th value=\" \" but this isn\'t working.[详细]

2023-03-10 00:50 分类：问答
Casting a NULL value

I\'m trying to populate a class object with values from a database table. The someObject.Property field is a nullable int type.[详细]

2023-03-07 06:09 分类：问答