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DBProviderInfo.SupportsNullColumns Proprietà

Definizione

Restituisce un valore booleano che indica se la tabella supporta colonne Null. Questo campo è di sola lettura.

public:
 property bool SupportsNullColumns { bool get(); };
public bool SupportsNullColumns { get; }
member this.SupportsNullColumns : bool
Public ReadOnly Property SupportsNullColumns As Boolean

Valore della proprietà

Valore booleano che indica se la tabella supporta colonne Null. Il valore true indica che sono supportate colonne Null.

Esempio

Nell'esempio seguente vengono enumerate le proprietà dei provider di database disponibili nel computer.

namespace dbproviderinfo  
{  
    class Program  
    {  
        static void Main(string[] args)  
        {  
            Application app = new Application();  
            DBProviderInfos dbis = app.DBProviderInfos;  
            foreach (DBProviderInfo dbi in dbis)  
            {  
                Console.WriteLine("Description = {0}, Name = {1}, ParseName = {2}", dbi.Description, dbi.Name, dbi.ParseName);  
                Console.WriteLine("ProviderSubType ={0}, ProviderType = {1}", dbi.ProviderSubType, dbi.ProviderType);  
                Console.WriteLine("SupportsNullColumns = {0}, UseFullTableName = {1}", dbi.SupportsNullColumns, dbi.UseFullTableName);  
            }  
        }  
    }  
}  
Namespace dbproviderinfo  
    Class Program  
        Shared  Sub Main(ByVal args() As String)  
            Dim app As Application =  New Application()   
            Dim dbis As DBProviderInfos =  app.DBProviderInfos   
            Dim dbi As DBProviderInfo  
            For Each dbi In dbis  
                Console.WriteLine("Description = {0}, Name = {1}, ParseName = {2}", dbi.Description, dbi.Name, dbi.ParseName)  
                Console.WriteLine("ProviderSubType ={0}, ProviderType = {1}", dbi.ProviderSubType, dbi.ProviderType)  
                Console.WriteLine("SupportsNullColumns = {0}, UseFullTableName = {1}", dbi.SupportsNullColumns, dbi.UseFullTableName)  
            Next  
        End Sub  
    End Class  
End Namespace  

Output di esempio:

Description = Provider OLE DB MediaCatalogDB, Name = MediaCatalogDB OLE DB Provider, ParseName = {09E767A6-4481-4791-86A5-A739E5290E4C}

ProviderSubType =None, ProviderType = OleDb

SupportsNullColumns = True, UseFullTableName = True

Description = Provider Microsoft OLE DB per SQL Server, Name = SQLOLEDB, ParseName = {0C7FF16C-38E3-11d0-97AB-00C04FC2AD98}

ProviderSubType =SqlServer, ProviderType = OleDb

SupportsNullColumns = True, UseFullTableName = True

Si applica a