When I am making a query for a data from a MS SQL Server database via C# [.Net 4] Code and adding a parameter to the query with a value of " ", the datareader is obtained without any exception and when i read the data from the datareader, i get the exception.
为测试目的,除了在投入结束时外,还使用了“<代码>>>>>>代替“GUID”。
I think you are confusing several flavours of Null (.NET Clr null references, Database NULL values and ASCII 0 character literals).
如果你想通过C#通行证中的空座,
string emptyString = String.Empty
通过无效值通行证:代码>null;
string nullString = null;
但是,通过<代码>NUL,通过DBNull
dbParam.Value = string.IsNullOrEmpty(str)? DBNull.Value : str;
另见。 SqlPara amount with Nullable Value give mis while ExecuteNon Query?
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